Ten-Tec Argonaut II 535, Delta II 536 transceiver User manual
Below you will find brief information for transceiver Argonaut II 535, transceiver Delta II 536. The transceiver Argonaut II 535 and transceiver Delta II 536 are both HF transceivers that offer a variety of features for both fixed and mobile operation. The transceiver Argonaut II 535 has a maximum output power of 5 watts, while the transceiver Delta II 536 has a maximum output power of 100 watts. Both transceivers include a built-in speech processor and can be used with a variety of antennas.
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Part ho, 74212 CHAPTER 1 INSTALLATION: 1-1 INTRODUCTION the transceiver and the power supply. Do not confine the transceiver and power supply io a smali volume without adequate ventilation. When placing the transceiver in a mobile in- stallation, try to keep the transceiver away from high heat sources. Also try to seléci à location that allows comfortableaccesstothe | frontpanel controls and adequate clearance for rear panel connections. 1-4 FIXED STATION & MOBILE. The Model 535/536, with conventional antennas, wili perform with distinction in any ham shack. The Model 535/536 may be used for mobile operation ina car, boat, plane, or other vehicle using the Model 293 Mobile Mount, It operates directly froma:12 to 14 VDC supply source and is self-contained except for key, . microphone, tilt bail, and antenna. — NOTE: If the battery voltage drops be- low 10voits, the display will start blinking and the Model 535/336 will not operate properiy. The SWR meter is especially useful In setting mobile whip antenna lengths to the icin ПВО: When setting vp the station, provide adequate ventilation for | ED BA Y DO TART AND HE VEHICLE'S ENGI IT y 26 DO | WHEN USING AN ALTERNATOR | == High voltage transients, cau sed a momentar- ily open regulator contacts, may cause serious * damage to the transceiver circuits. 1-3 POWER SUPPLY Usez 12to14 VDC negative ground power source capable of de- livering 3-ampéres(Model- 5 35) or 20 amperes(Model 536), well regulated. When powering from the TEN-TEC Model 933/936 power supply, interconnect units with the cable attached to the power supply. — When other supplies of used, pin connections to the rear panel mounted power socket are as shown in FIG- URE 1-1. Polarity is also indicated SR on the rear PUE AUX | ВЕСИ | 9 13.5 VDC HE 20 Amp: BLACK) FIGURE 1-1. POWER SUPPLY CONNECTIONS If you wish to operate the Model 535/336 from à Model 961 power supply, which has a four pin cable connector, an adapter cable . (Model #306) must be used as shown in FIGURE 1-2. | RED | 9 HUW PER e | © BLACK(-—) IGURE 1-2. POWER SUPPLY ADAPTER CABLE (4 Pin to 2 Pin) a battery are: . 1-1 1-2 1-4 ANTENNAS Any antenna presenting 25 to 750) impédance will load satisfactorily. Random length and balanced antennas will require an antenna tuner. Most popular mobile - antennas will operate at their resonant fre- quency without special matching. Whe they are used as.portable antennas, a good ground system or counterpoise should be provided. The Model 535/536 1s designed for use as an unbalanced feed system. ry - Although improper antennas will not damage the final output transistors, it is suggested that an SWR of 2 io 1 or less be . achieved for maximum performance. The col lector current (Ic) should be less than 3 -Am-- peres for the Model 535 and 20 Amperes for the Model 536 at maximum output power. Be sure to readjust the MIC control after reducing the PWR level. 1-5 MICROPHONE For SSB operation, plug a low impedance dynamic or electret microphone into this jack. Amplified micro- phones can bz used if the. output level is adjusted to a lów enough value to prevent the microphone circuit from overivading. The Model 535/536 will work with Ten-Tec Model 700 or Model 705 or microphones having an impedance of 208 Ohms to 50k Ohms. See Figure 2-1 for wiring information. 1-6 KEY For CW operation, connect a Model 604, 605, or 606 to this jack. When using electronic keyers, they should be config- ured for positive keying, not ** grid block" or negative, If configured for negative keying, no damage will-occur, but the keying circuit. will not operate. 1-7 GROUND In the interest of personal safety and to reduce the possibility of stray RY pickup on interconnecting cables which may cause parasitic oscillations, all station equip- ment should be well grounded to earth. Jt 13 also important to strap all equipment chassis together with short, heavy leads. For the rt, DELTA II the strap between the power supply and the transceiver serves {0 reduce the volt- agé drop on the negative lead caused by wire ‘and connector resistance. In mobile installa- tions, connect a ground strap between the rear panel ground lug and the vehicle chassis, 1-§ BATTERY BACKUP The Model 535/ 536 uses a factory installed 3 VDC lithium. battery (Panasonic CR2032 or Mallory. DL2032) to maintain theclock memory. Typi- cal lifeia3 tos years. , . - To replace the 3 VDC lithium battery, | turn the power switch off and proceed as follows: STEP)” Remove (be op and beltom covers. STEP? There aie fot serews that fasten the front panel to the chassis. Remove — the. upper left and upper right a . - bel sctews. | — STEP-3 Tilt the front ninel de down. losing. >... ACCESS to he UL STEP 4 There 15 A va pin: cjumper plug. . a immediately to the nght of the battery A holder. Remove this plug. STEPS Slide the old battery out of its holder. | + Wipe the new “battery clean of any oil or finger prints and slide the pew bat- | Vs into plane, 5 STEPÓ ‚Turn: the power. switch on and re- insert the Jumper ERP i STEP 4, Tu Tur the powet. switch off. STEP. 8 “Repiacat din m fic head gorews o removed in stáp 2. STEP9 Replace ff the og and bôtiom cavers. STEP 10° - Check the' operation of the trans- ceiver; If you encounter a problem try pushing the reset button. Part Mo, 74212 Navarmbar T991 Pahtad In U.S.A Part No, 74212 November 1861 Prantad in LSA, 1-9 535/536 ACCESSORIES These are the available accessories common to both the 535/336. Modal 29] - - - - Partable/Mobile 200 watt antenna tuner 201- - - - Mobile Mount 305----R5-2472 Serial Level converter I06- - - - Plug sdaptor, 4-pin power supplies to 2-pin 535/536 606-- --Low Current Curtis Chip Keyer THC --Hand Microphone 704-- --Desk Microphone 35057 - 4-pin mic plug 45165-- 2-pin connector shell 41020-- Female pin {2 needed ) In addition to the above these accessories are available foryour Model 535 ARGONAUTIT, Model_# 290-- - - Step Attenuator, steps power From SW to LOnmA 035-- -- 12%, 3A Power Supply, 120/240% AC input In addition to the above these accessories are available for your Model 536 DELTA II. Model $ 264- - -- Remate Control Cable, 536 to 420 and 253 fo! 268) *H8- - -- Remote Control Cable, 536 to 420 or 233 269- - - - 28K Linear Switching Cable, 33610 420,422, or 425 A03- - - - Fan Kit for full power FM and RTTY modes 104- - - - Auxilarÿ RCA type phono connectors to sim- plify use of T-1 on rear panel 936----20v, 204 Power Supply, 120240 AC input 1140--- 7204 circuit breaker for mobile use (1 contac= tera) 1-10 EXTERNAL LINEAR AMPLIFIER Refer to section 2-10.11, figure 2-3a, and figure 2-3b for details on the connection of the Model 536 to amplifiers available from Ten-Tec or other manufacturers. Part Mo. 74212 Reme 142) - CHAPTER 2 OPERATING INSTRUCTIONS 2-1 - POWERING UP THE. TRANS- CEIVER This chapter describes the various - controls and features of the Model 535/536 transceivers. Once the unit has been properly installed you are ready to become familiar with its operation. Before pewering up the trans- - ceiver, set ail controls and switches as shown below: ' FRONT PANEL AF ====-—— 9:00 RE omnes Max CW МПС ------- Max CCW PYR ------ Max CCW ЕХО ------- 12:00 NOTCH -- Max CW PBT ----— 12:00 IF BW ---- Max CW METER --- FWD PROL --—- OFF (Switch or out position} М.В. ------- OFF VOX -—--- QFE АСС --—-- FAST AGC ------ ON ATTN ----- OFF LAMP ---- UN SOL -----— OFF REAR PANEL I1-- On the DELTA TI the supplied jumper plug mustbei in stalled to transmit. Turn on the unit by pushing- the - POWER button. Thetransceiver will comeon — : in the same condition that it was last Used. A factory installed lithium battery retains the © mode and frequency settings that were last used during final burn-in atthe factory. As you familiarize yourself withthe © Model 535/536, and it should fail to operate normally, refer to the troubleshooting chart Е table 3-1 on page 34. 22 TUNING THE TRANSCEIVER Several methods can be used to select the desired operating frequency: within a band. Keypad commands are mere convenient when moving. between . bands, Both methods arc described below: 2-3.1 MAIN TUNING KNOB The knob is adjustable so you may select the amount of drag or tension desired, To adjust, hold the onter chrome dial skirt ring with one hand and turn the rubber portion of the knob clockwise with the other hand. About 1/8 turn will i in- crease drag considerably. Except for AM and FM modes the tuning increment is in 10 Hz steps and each revolution of the toning knob is approximately 5 KHz of travel. A faster tuning rate can be selected from the keypad which increases the tuning steps to 50 Hz and is approximately 23 KHz per revolution. To select (his fast rate push the button and'observe that the "FAST" annunciator appearsat he right sideof the display. Push again to return to thenormal setting. The main. tuning knob is used most often when tuning * The tuning system has an additional speed shift feature which increases the tuning rate automatically when the knob is spun at 4 fast rate. This feature anticipates when the operatoris trying to moveacrossa band quickly and assists by shifting to the larger step size. - TABLE 2-1 charts the step sizes for all combi- nations of modes and tuning rates. Normal Shifted as prompts. Type in the desired frequency by pushing the buttons above each number. The transceiv uires that imal be en between the MH 100 digi The frequency can be typed in all the way down io the nearest 100 Hz or by pushing again and the remaining digits will be filled with zeros. If an error is made while entering a frequency just push the button toexit The "LOCK" annunciator will appear in the display. To exit the lock condition, push [F), [M TUNE | again. 1.2.2 TUNING FROM THE KEYPAD Another method of moving within aband or between bands rapidly is ta use the [4 | and -[Y] buttons or the "ham band" up and down feature. The CA] and LE] keys tune the trans- ceiver in 100 KHz steps or in 1 MHz steps if FASTis selected. Ifthe Fl key is pressed first then [TA] moves the transceiver up by one ham band. Likewise LF] [¥] will move the trans- ceiver down one ham band. Below many of the keypad buttons are "the numbers 0 through 9 and a decimal point. To enter a frequency directly from the keypad, first push the button. The frequency display will respond by showing seven dashes Normal CW/USA/LSB/FSK | 10H: БОН! the sequence and start again. EM 100Hz 500 Hz Examples: AM _ | 50h: 500Hz a , in _ — Fast Faat Shilted, Ш Desired Frequency и | emmeenenroe so | mu | 1423500 | 38500 en — - m Press:[ ENTER ] Press:[ ENTER ) AM 50 Hz 500Hz a 3 TABLE, 2-1 я | в 8 Another feature which may be useful 9 5 during mobile operation is the tuning lock 3 3 ‘command. Once adesired frequency hasbeen - 5 3 selected, the tuning knob can be disabled by [re pushing the keypad sequence [E], [M. TUNE]. Nate: In the second example you were not required to press again after you entered the 100Hz digit, in this case, the last TD 2-2.3 RECEIVE OEFSET TUNING RXO Receive offset tuning is enabled by pushing the[RS5 _lbutton. The RXOannun- ciatorisnow visible in theupper rightcomer of the display and the clock display becomes an offset frequency indicator, Using the EXO knob, the receiver section of the transceiver can be tuned either above or below the trans- mit frequency by up to 1.27 KHz or 2.34 KHz inthe FAST tuning mode. Theindicator shows the amount and direction of the offset, This function is especially useful for clarifying individual stations on & SSE netor for fine tuning the received note during a CW contact. Part Mo. 7421; Novambar 149 Printad Im U.S. Part No. 74212 Novambe, 1581 Printod In USA, 2.3.1 RECEIVING IN CW 2-3 SELECTING MODE The transceiver will operate on all the standard HF modes except AM transmit. Two mode select buttons and scroll through FM, AM, LSB, USB and CW from opposite directions. The current mode is always displayed on the LCD readout, If the keypad beep function is activated, the first character of the modes sent in morse code using the sidetone. Note; In FM made the squelch function may cause the receiver to go completely silent as you shift past that mode. In CW receive, there is a factory programmed offset of 700 Hz programmed into the VFO's, This causes a received signal at the displayed fre- guency to generate a 700 Hz note for the operator to copy. To help the operator judge - when the received signal has been tuned to 700 Hz the built in sidetone oscillator has also been preset to 700 Hz. Pushing the button momentarily keys the sidetene oscilla- tor and allows the operator to match the re- ceived signal to the pitch of the sidetone. 2-3.2 USING THE TUNE FUNCTION The button provides an easy way to penerate a CW key down condition. With TUNE activated, the readout will indi- cate both "CW" and "TUNE" and the "TX" annunciator will appear. The transceiver will outputa CW carrier at the displayed frequency at a power level determined by the PWR control, 24 USING THE DUAL YFO'S For operating versatility, the transceiver has two VFO's {Variable Frequency Oscillators). These can bé used separately or in split mode to generate a transmit to réceive split in fre- quency. | 2-41 SELECTING A YFO Thel_ 46 | button toggles contrel of the transcerver be- tween the A and B VFOs. Each VFO works independently. do not affect the other, Each VFO retains the frequency and mode from the last timeis was selected. To net the two VFOs push the [дев | button. This will cause the contents : of the displayed VFO, either A or B, to ae written into the other Y FO. - 3.4.2 USING SPLIT VFOs quency operation gives the user the freedom of receiving and transmitting on different fre- quencies. Even the mode of operation can be different between receive and transmit... Toenable split VFO operation pu sh the button. The SPLIT annunciator will appear and the hidden VFO will now control the transmitter frequency and mode. The hidden transmit VFO can be pre- viewed using the [_Rev__] button. - This "re- verse" button calls up the hidden VFO in receive and lets theoperator monitor or change. the transmit frequency. Thisbutton is momen- tary so that upon release, the transceiver re- turns to the receive VEO. 2-5 MEMORIES There are a total of 48 memory channels available (00-47). Memory channels 00-31 are simplex and will hold only one frequency and mode setting. Memory channels 32-47 are duplex memories and will hold the frequency and mode information for both YFO A and VFOB. In addition, thère is one separate Scratch Pad Memory which can be used to hold one temporary frequency and mode without affecting the other programmed memories. 25.1 USING THE SCRATCH PAD. Information in the active YFO 15 written to the scratch pad by quickly pushing the button twice. This scratch pad is useful for marking a station or a spot on the band to which you want to return frequently. To recall the scratch pad frequency, quickly push the button twice, Changes made to one VFO Split. fre- Lk 2-4 2-5.2 STORING TO MEMORY To store the current frequency and mode in a memory location press the key. The clock readout will change to a two digit blinking promptasking fora memory location number. Enter a two digit number using the keypad buttons tocomplete the store. 1f youareunsure of which memories are aiready filled, press the key instead of a two digit location and the transceiver will store the VFO inthe lowest available memory. When all of the memory locations are occupied the right most decimal point in the frequency readout will come on. When this happens refer to the MEMORY CLEAR pro- cedure to clear out one or more of the memory Jocations or write over an existing memory, 2.5.3 RECALLING FROM MEMORY To recall from a memory location press the button and enter the desired two digit location when the blinking prompt ap- pears in place of the clock readout, Informa- tion from the memory will be transferred into the active VFO. 5.5.4 USING MEMORY TUNE Rather than recall memory locations one at a time, a quick way te step through memories is by using the memory tune feature, The [M TUNE | button causes the main tuning knob to become a memory channel selector. The main tuning knob will now scroll through the locations and display the frequency and channel number, The receiver does pot, however, tune to the displayed frequency unless the is pressed. This key will transfer information from the selected memory channel into the active VFO. To exit the memory tune modé press Again. | There is an alternate memory tuning method that can be selected using another keypad sequence. The "MSM" Memory Scan Mode can be accessed by first selecting as before and then pressing LE], [Rev |. The "MSM" annunciator will ap- pear above the frequency readout to the left of “WM TUNE". Inthis condition, thereceiver will automatically move to each new frequency as the ‘memories are recalled from the tuning | knob. Remember that the original status ofthe active VFO will be lostand the transceiver will remain on the last chosen Memory location when you exit M TUNE. This "MSM" mode can be disabled by again pressing LES. | REY | 1-5,5 CLEARING MEMORIES Indi- vidual memory locations can be cleared by using the M TUNE feature. Press the LM. TUNE | button and scroll through memory locations with the tuning kmob. As the unwanted memory locations are displayed press the button to remove them. If you wish to clear out all of the memory locations, turn the power switch off and then press and hold the [clear key, Turn the power switch on and continue to Press thel CAR) key until the frequency display comes on and shows "15,000.00", 2.6 SPECIAL KEYPAD FUNCTIONS Many of the analog adjustments that have traditionally been relegated to rear panels or even inside radio equipment are DOW incorporated into the keypad of the Model 535/536, This feature 1s important considering that some installations would make these ad- justments difficultto change. 3.6.1 SETTING THE SIDETONE LEVEL To set the sidetone level use the keypad sequence [F-], [240]. This will key — te sidetone and let you adjust the volume using the [A] and [4] keys. The "C.SET" annunciator will blink until you find the de- sired level. Press to storethe setting. Part Na, 742 Movember TE Prinfad In LU. Pert No. 74212 Movamber 156 Printad In LU.5, 1 À. 24.2 SETTING THE VOX Before the VOX controls can be adjusted the transceiver must be set up for VOX controlled 55B operation. Tune the transceiver to aham band and select either LSB or USB mode. Turn the MIC control fully counter clockwise and press the front panel VOX button so the VOX indi- cator lightcomeson. NowpressLF |, and speak into your microphone normally. Adjust the VOX gain using the LA] and LY keys until the transceiver keys reliably, To store the setting press the key. VOX delay should be set so the trans- ceiver does not switch back to receive during the natural pauses in your transmitted speech. Ta set the delay, push LE], and key the VOX by speaking into the microphone. Notice the length of time that the transceiver stays keyed. To shorien the delay use the LEI button or to lengthen the delay use [A]. Once you're comfortable with the setting, press [ENTER ]. ANTIVOX is used to counteract the receiver audio that makes its way from the station speaker back into the microphone. To set the ANTIVOX level, press LE |, and usethe LA ] and [FT] buttons until modérate receiver audio does not tend to trip the VOX. Store this seiting with the key. 2-6.3 SETTING THE CLOCK. The built- in 24 hour clock uses a 32 KHz watch crystal and is powered from the internal lithium bat- tery. To set the clock, press | The hours digits will blink and canbe changed with the LA] and [Y] key. When the correct hour digits are set, press L ENTER ], Now adjust theblinking minutes digits, Press[ ENTER ] to start the clock from the new value, 2-6.4 TRANSMITTER FREQUENCY COVERAGE As shipped from the factory, the Model 533/536 will transmit only on fre- quencies authorized for the Amateur Radio Service. If you hold authorization to operaté on frequencies outside the Amateur Radio Service, you may defeat this lock-out. Press [F] [Moo ee], There is no indication in the frequency display regarding status of the lock- out, The user is résponsible to transmit only within his authorized frequency allocations. 2-7 FRONT PANEL CONTROLS Four dual controlsand four switches give the opera- tor full control of transceiver operation. Refer to figure 3-1 (Model 535) or figure 3-5 (Model 336). = 2-7.1 AF/RF GAIN The RF pain control selects the amount of gain in the receiver IF stages. Mostoperators setit full clockwise and rarely reduce it except in cases of extreme receiver overload caused by strong. signals. The AF gain controls the audio volume. 2-7.2 PRT/IF BW Selectivity for the Model 535/536 is determined by the eight pole pat- ented "Jones" filter. The IF BW control sets the IF bandwidth from approximately S00Hz at fully counterclockwise to 25G0Hz at fully clockwise. In LSB mode, rotation of the lF BW control from the 2500Hz setting towards the 500Hz setting will continually reduce the high frequency response. In the fully counterclock- wise position, the audio frequency response will be approximately 20010 700Hz. When the (ransceiver isin the USE mode, rotation of the control from the 2500Hz setting will continu- ally reduce the low frequency response. In the full counterclockwise position, the audio fre- quency response will be approximately 2300Hz to 2800Hz. The position of any filter bandwidth in any mode with respect to the BFO (actually the received audio spectrum) may be set by the PBT control. For instance, if there is high frequency interference, such as splatter, when 2-5 you are on LSB, you can remove the interfer- ence by either rotating the PBT control slightly counterclockwise or by rotating the IF BW control slightly counterclockwise. In the first instance you are shifting the passband away from the interference and in the second you are actually reducing the passband to eliminate the interference, If you are in USB with the same interference, rotating the PBT control clock- wise willeliminate the splatter. Since, in USE, rotation of the IF BW control will only reduce the low frequency response, this control will not eliminate the interference. In some in- stances, shifting the passband to eliminate the high frequency splatter may pick up unwanted low frequency interference. In this case, Te- ducing the bandwidth will eliminate the prob- lem. | For optimum performance when receiv- ing CW signals, see section 3-1.1 for additional information on the use of IF- BW control. NOTE: WHEN YOU CHANGE MODES TO CW OR SSB, DO NOT NEGLECT TO CENTER THE PBT CONTROL TO 12 O'CLOCK. 2.7.3 RX0 / NOTCH The NOTCH control adjusts the center frequency of ihe audio notch across the passband. The notch depth is al least 50 dB and will reduce carrier interference by this amount or more. To use the NOTCH, rotate the control slowly until the umwanteo signal is reduced. The notch circuit 18 effec- tively removed by turning the control fully clockwise in SSB or CW mode. When listen- ing in AM mode, NOTCH should be fully counterclockwise to provide maximum high frequency response. RXO (receive offset) is selected from the front panel keypad as previously described in paragraph 2-2.3. This knob is normally positionedat 12 o'clock for no offset and can be turned clockwise or counterclockwise te help clarify received signals. The LCD display indicates the amount of offset either above or below the transmit frequency. 2.7.4 MIC / PWR The PWR control varies the amountof power output forall modes. This allows you to set your peak output power to any value. The MIC contro} varies the amount of audio applied to the transmit balanced modulator. | To set these controls, place the METER switch in the FWD power position and place the transceiver in transmit using the TUNE function. Advance the PWE control to the desired power level. The power level for CW operation is now set; For SSB operation, while speaking into the microphone in a-nor- mal voice, advance the MIC control until the ALC LED lights on voice peaks. | NOTE: THE ALC LED WILL LIGHT AT ALL PWR SETTINGS WHEN OP- ERATING IN CW OR TUNE MODES, Increasing the MIC setting over that re- quired to just light the ALC LED on voice peaks will not result in any appreciable in- crease in power out. However, overdrive wil produce SSB, AFSK, or $8TV distortion prod- acts. The MIC control has no effect In FM mode. ‘ 2-7.5 PROC The PROC switchactivates the speech processor. The procéssorincreases the average specch power and allows a greater range of voice levels to atiain peak ALC level. An LED above the switch indicates when the processor has been selected, The speech processor will affect the set- ting of the MIC control. - With the processor tumed on, reduce the MIC contro] as needed to prevent distortion. | Severe distortion, objectionable back- ground noise, and transmitted splatter will oc- cur if the MIC control is notadjusted so that the ALC LED just lights on voice peaks. Fart No, 74, Havambar 1 Printed im U Part Né, 74212 November 1981 2-7.6 FWD/SWR METER SWITCH This switch selects the function of the bar graph meter during transmit. In the FWT position, meter indicates output power with full scale equal to 100 watts ouiput (Model 336) or 5 wattsoutput (Model 335). In SWE position the bar graph indicates reflécied power. When three bars on the graph are solid, thé SWR 18 approximately 2:1. As a better match 15 achieved the third bar will begin flashing then disappear, leaving two bars solid, This repre- sents about 1.5:1 and is an adequate match for most applications. If a lower SWR is desired, continued matching will cause the second bar to flash and then disappear, followed by the first har. If the first bar disappears the SWR is 1:1. 2.7.7 VOX SWITCH This switch selects either the VOX (voice operated relay) or PTT (push to talk) mode for keying the transceiver, Refer 10 section 2-6.2 to set up the VOX, 2-7.8 NOISEBLANKER This switch turns on the Noise Blanker. The circuit can reduce troublesome external noise problems from various man-made sources. Itwill havelittleor no effect on most naturally occurring noise. Ii should not be left on except when required Lo reduce noise. 2-8 FRONT PANEL CONNECTIONS 2-8.1 MIC The microphone circuit has been designed for low impedance microphones with 2 minimum 5mV output. Transistorized microphones may alsobe used, providing their putput level is adjusted so that the input stages | of the Model 535/536 are not overdriven, The cable, which should provide shielding for all leads, is terminated with a standard 4 pin micro- phone plug. Failure to shield both microphone and PTT leads may resultin RF getting into the audio circuits. Connections to the plug are as shown in FIGURE 2-1, yl lis PA € AT 4 “et END PTT FRONT VIEW OF 535/536 - FIGURE 2-1. MIC CONNECTIONS 2-8.2 PHONES This jack is designed to be used with a standard 1/4" plug. Either stereo or monaural headphones with an impedance of 4 to 16 ohms may be used, The internal speaker is disabled when headphones are plugged in, 2-9 TOP PANEL SWITCHES 2-9,1 QSK FAST / SLOW This switch controls how guickly the receive audio TECOV-- ers after à transmit condition, The fast setting gives full OSK operation for fast break-in, the SLOW setting keeps the receiver muted for approximately one second after key-up. 1-02 AGC FAST / SLOW, ON / OFF These two switches set the receiver AGC action. AGC decay times of .25 or 2 seconds are selected with the FAST / SLOW switch. Fast AGC lets the receiver adapt quickly to interference and changing signal levels but SLOW AGC is generally more comfortable to use especially for routine SSB listening. With the AGC system turned OFF the receiver gain must be controlled manually using the RF gain control. 2-9.3 ATTN -20 dB / OFF This switch inserts a 20 dB atienuator pad at the recerver input, Itisnormally leftin the OFF position, With the attenuator on, unusually large signals can be received without overload or blocking. 2-9.4 LAMP ON / OFF The electroluminescent back light for the LCD display can be turned ON or OFF. | "le U 2-7 2-8 25.5 SOL ON / OFF This switch controls the FM squelch feature. With the squelch on only signals strong enough to give approximately 20 dB of quieting will break the squelch. Thesquelchis only active in FM mode. 2-10 REAR PANEL The following section describes the rear panel connectors. Also refer to figure 3-2 (Model 535) or figure 3-6 (Model 536). THE FOLLOWING CONNECTIONS ARE FOUND ON THE 535/536. 2.10.1 ANT This connector mates witha PL- 259 style plug. Use any S0Q coaxial feedline to connect antennas, unersor amplifiers to the Model 535/536. Takecarethatany connected load presents less than 3 : 1 SWR to the transceiver, 2-10.2 POWER 13.6 This 2 pin connector provides the main DC power connection to the transceiver, Matching plugs and terminals are included in the Model 535/536 packing kit. The DC power source must be capable of supplying a regulated voltage between 11.5 and 14.0 VDC at 3 amps for the Model 535 and 20amps for the Model 536 . See Figure 1-1 for connection information. 119,3 FUSE The ARGONAUT IL uses an AGC 4 amp slo blow fuse and the DELTA IT uses a type AGC 25 amp fast blow fuse. The fuse works in conjunction with an internal reverse polarity diode to protect the trans- ceiver from supply voliage with reversed po- larity, 2.10.4 CW KEY Te key the transceiver. ground the key line using either an open col- lector or relay output keyer, à bug or straight key. 2-10.5 AUX DC This phono jack provides aconvenient source of + 13.5 VDC for acces- sories. Internally the jack is connected to the main DC input. This isa low current (2 Amps or less) output for small station accessories only. 2-10.6 GROUND POST Used for ihe primary transceiver ground. To prevent per- sonal injury, interference and other ground related problems, connect this terminal to a good earth ground using heavy gauge Copper braid or wire and make the connection as short as possible. 2-10.7 J-3 SERIAL INTERFACE PORT This 1/8" phone jack carries serial inter- face data to and from the transceiver, A Model 305 Level Convertor is required to interface the 535/536 to an RS232 computer port. Detailson the interface protocol and the programming are contained in the Model 305 manual, THE FOLLOWING CONNECTION IS | FOUND ONLY ON THE 535 ARGONAUT II. 2-10.8 ATTENUATOR LOOP These two phono jacks bring the 5 watt transmit output to the rear panel. Normally a plug jumper routes this transmit signal back into the radio and to the SO-239 antenna con- nector. To use the Model 290 calibrated attenuator remove the plug jumper and patch in the attenuator using 3042 coax jumper cables. THE FOLLOWING CONNECTIONS ARE FOUND ONLY ON THE 536 DELTA I. 2.10.9 SPKR An external 45) to 160 speaker can be used with the Model 536, Use a 4 inch single circuit phone plug for this connection. Part No, 7421: Navambar 199 Printed In U.S. Part Mo, 74212 Novambaer 1851 Printed In U.E.A. 2-10.10 FAN This output is for the Model 303 cooling fan accessory. 13.5 VDC isther- mostatically switched to this jack when the heat sink temperature reaches Че level of 1309-1569. 2-10.11 | J- 1 ACCESSORY JACK = (Model 536) This eight pin DIN jack carries many of the connections needed to implement ye more sophisticated. station hook-=ups. transceiver is shipped with an eight pin plug installed which connects pins 5 ad 8. “This » jumper completes the keying loop necessary - for transmitter ‘operation. Pin identification - | numbérsare shown: in fiente?-?2 below. On the The... - FIGURE 2-2. ACCESSORY JACK Л i 1.70 scription of these pin numbers in more detail. Finally, refer to figure 2-3a and figure 2-3b for - information regarding amplifier hook-up. VIEW OF CONNECTOR AS SEEN ON ‘REAR OF DELTA Il ! у : г" д E J Tp EE EEE Le FUNCTION 2-10 | 1. - Fixed Audio Output: Receiver audio output for modems, phone patch, etc. Qutputlevel is approximately 100 mV rms when receiver is into AGC. . : 1.0 Kohmoutput impedance, Short circuit proof. | 2 - PTT Line: This PTT line is paralleled with PTT pin.on the front panel mic jack. Short this line to ground to kay the transceiver. ORO 3 - Audiolnout: Rear panel input into microphone amplifier circuit. Recom- 5 | mended level is between TOmV rms and 100 mV rms. Shielded wires | a.must for this connection. Connect braid to the shellofthe DIN prue. | 4 Receiver Mute: Ground this line ta mute the receiver audio ouiputand. - activate the open collector T line at pin six. 7 CU To 5 TX ENABLE: This active lowinput signalsthe radio to begin the go-to-transmit oe e0MMaNd. Connects to key-out jack on TEC-TEC linear amplifiers. . e: Open Collector T Line: Commonly used tokey alinear amplifier. A phono socket : on J1is supplied connected to this pin. Open collector output provides alowcurrent sink {< 250 mA) ta groundwhen transceiver is keyed, The | Thang time" ofthis outputis internally adjustable on board No. 81531. # Mic Mute Ling: Ground this pinto disable the front panel microphone input - during transmit. | | TX Request: This output oes low when the transceiver has been keyecl Tram either the KEY ar PT? lines, Connects to key-in jack on TEN-TEC linear amplifiers | Shell! Ground Connection | TABLE 2-2 J1 ACCESSORY JACK FIN DESCRIPTIONS “NOTES: 1-The ground contact if required for your connections, isthe shellof J1 orJ2. A soldertab is provided on the connectors supplied, 2- Pins 5 and 8 provide a keying loop thatcan be routed to extemal accessories such as TEN- TEC tunersandamplifiers. Access tothese two signal lines lets external equipment take control of thetiming in the DELTA II transmitter. 3-The pheno socket provided on DIN plug, T1, is supplied to make connection to a linear amplifier as easy as possible. 4-For convement AFSK operation the MIC MUTE and PTT lines can be wired together. When this combined connection is grounded, the radio is keyed and the AFSK tones.can be injected through the audio input at pin 3 without interference from the front panel microphone. r Part No, 74212 November 1851 Printad: Im USA TEN-TEC LINEAR AMPLIFIER REAR PANEL RF IN в | O TEN—TEC . DELTA il REAR PANEL KEY IN KEY BUT о © м e J1 ы e | G J1—PIN 5 J2 | O MODEL 268 CABLE J1—PIN 8 OS FIGURE 2-32 CONNECTION OF DELTA IT TO TEN-TEC AMPLIFIER Za RELAY KEY VOLTAGE MUST NON QSK BE LESS THAN 3OvOC AND LESS THAN 250 ma LINEAR AMPLIFIER RF IN Q TEN-TEC DELTA || e REAR PANEL 0 G j J1-FIN 6 al © О ПО, Part No. 74217 Movember 1561 Printed in USA, FIGURE 2-3b CONNECTION OF DELTA II TO NON QSK AMPLIFIER 2-13 2-10.12 J-2 BAND LINE OUTPUTS FIG.24 Theseactivehigh outputs indicate on which one of six band segments the transceiver is tuned. These lines are provided for selecting bands on TEN-TEC amplifiersand tuners or for switching antennas. The output voltage is typi- cally 2 volts below the supply voltage fed to the DELTA TI. Take care not to draw more than 5 mA from these outputs, they are not short circuit proof. | VIEW DOF CONNECTOR AS SEEN ON REAR OF DELTA Il FIGURE 2-4 ACCESSORY JACK E PIN BAND 21.5-30.0MHz 14.5-21.5MHz nacommection 7.5-14.5MHz 4.0-7.5MH= 2.5-40MHz 0.1-2.5MHz I Ground SONNE Remote control hook-up for band selections between Model 536 and Model 420/253. Refer to figure 2-5a and 2-5b, PIN MODEL536 7 6 5 LT - 26) 25 - 40) (40 - 75) {75 -14,5) 145 -21.5) (21.5 -30.0) TO TO TO TO TO TO ih — MODEL 420/253 11,7 - 2.5} (25 - 4.0) 6.5 -105) (16,5 -15.0} {15.0 - 22.0 122.0 -30,0} — Jom = Part No, 74212 Movarnber 1591 Printed In ELSA TEN-TEC DELTA II REAR PANEL | CHANT TEN-TEC MODEL 420 OR 253 REAR PANEL 41 С) | | REMOTE i CONTROL | 120 | G MODEL 288 CASLE — ‘ FIGURE 2-5a CONNECTION FOR REMOTE BANDSWITCH CONTROL OF 420 OR 253 BY DELTA TI mm es of ES À a MODEL — 258 CABLE TEN—FEC MODEL 420 AND TEN--TEC MODEL 255 REMOTE CONTROL LI REMOTE CONTROL | MODEL 264 CABLE FIGURE 2-55 CONNECTION FOR REMOTE BANDSWITCH CONTROL OF 420 AND 253 BY DELTA П | A TEN-TEC DELTA II REAR PANEL JO CANT 1720 CA art Me, 74212 Jarama 1931 rinted In US, A, 2-13 Part Ma. 74212 Novambar 1597 Printar in US A. CHAPTER 3 OPERATING HINTS 3-1 INTRODUCTION This section provides additional useful information for get- ting maximum performance out of your Model 535/336, Alsoincluded is TABLE3-1, which provides trouble-shooting information 10 the event you experience problems. | 3-1.1 CW In the CW mode, the indicated frequency is the transmitted frequency, To accurately read an incoming signal, therefore, it is necessary to tune to a 700 Hz beat note. When the 535/530 is swiiched to CW mode, thé output of the product detector 15 passed through a 1 KHz low pass filter, This reduces background hiss, atmospheric noises, and makes CW operation less fatiguing, Other signals outside the audio filter may be present, but not heard, and will activate the AGC, causing a "pumping" action. Tt is recom- mended that the TF-BW bandwidth control be set to approximately 12 o'clock. This will sat the IF filter to 1 KHz bandwidth and eliminate the possibility of receiving a signal outside the audio filter passband. 3-1.2 FM The 535/536 will operate transceive + 5 kHz deviation FM. The PBT, IF-BW, and Noise Blanker switches do not function in this mode. The FM squelch is active when selected on the top panel. The AGC switch mustbe on to enable the S-meter. If split RX / TX is desired when operating through repeaters, program the transmit and receive frequencies in Y PO A and VEO E. The MIC control has no effect in the FM made and deviation (normally preset for fhe Model 705 microphone) is adjusted internally and preset at the factory. Th: power output 18 adjustable with PWE control as with other models. 3-1.3 PROTECTIVE CIRCUITRY & ALC ALC serves three major functions: 1) assures maximum power from the transmitter without critical adjustment of the input drive, | 2) prevents the amplifier from being overdriven into the nonlinear, distortion-pro- ducing area, 3) serves as a power limiting device which protects the output transistors, 31.4 SOLID-STATE POWER AMPLI- FIERS Although transistors and vacuum tubes both can be made to amplify RF power, there are some fundamental differences in how thisisaccomplished, A better understand ing will atd in récognizing correct or incorrect performance. Misconceptions sometimes arise from in- complete knowledge. This results in errone- ous conclusions being drawn that the equip- ment is faulty, erratic, or not performing to specifications. The purpose of the following information is to brief you on solid-state **no- tune’ RF amplifiers 50 you can knowledgea- bly approach and correct any apparent im- nroper performance characteristié. 3-1 3-2 3-1.5 BROADBAND vs RESONANT TANKS Almostall tube circuits use resonant tanks in the plate circuit. The 535/536 usesa broadband system. In class AB operation, these two approaches act similarly without drive being applied. The idle current is rela- tively low and within the device dissipation rating, even with load impedance variations from open to short circuit. However, with drive applied, the two act very differently. In the case of tubes, the dissipation within the tube depends on both the tuning of the tank and the load applied. If the tank is resonated and the load is very light, the internal power dissipated is quite small as indicated by the null which reduces plate cur- rent almost to the level with no drive. Out of résonance, thé plate current, and hence dissi- pation, increases rapidly and may damage the tube from overheating. In resonance, as the load 18 increased, the null becomes more shal- low at a higher plate current as a result of the power being delivered to theload. Asthetank is timed to resonance, the load impedance, which is usually on the order of 5082, is trans- formed to a relatively high impedance of sey- eral thousand chms te match the plate cirenit impedance. ‘Small load reactive components, either capacitive or inductive, can usually be balanced out in the tank resonating function. With transistors, drive applied and no load, there is no resonant high impedance to limit the collector current, and so power is poured info the circuit (much as the out-of- resonance tank condition). Since there is no load power, all has to be dissipated in the transistor. So evenwithnoload, the ALC TED may light as the current limiting circuitry is automatically reducing drive level, or the power supply circuit breaker may trip. The broad-band transformer system used with tran- sistors transforms the 502 load impedance not higher, but much lower {on the order of 4 or 5 {)) to match the transistor output impedance, Since this transformation is fixed in design, any reactive component in the load impedance is applied in a transformed way to the collector circuit. Certain reactances at this point, espe- cially inductive, give rise to parasitic oscilla- tion. To correct for this, the antenna imped- : añce shouid be changed to remove this reac- tance, or a matching network should be in- serted between the antenna and transceiver, It is important to remember that any antenna changes its impedance with — frequency, so one that resonates well at one end of the band may well cause oscillations to activate the current limiting ortrip the circuit breaker on the other end of the band, If entire band operation is desired, especially on the lower bands, an adjustable matching network would be the better choice, rather than try to make the an- tenna behave over the entire band on a cut- and-try basis. | A final point to bring out regarding broad- band vs tank systemsis that thereisa limitto the amount of current that you can draw from art emitting filament, and this saturation current will limit the amount of power drawn from the supply. In the case of transistors, wliere the collector internal impedanceis only a fraction of an ohm, extremely high currents can be demanded of the power supply, especially with mismatched loads well below 50 2. A fuse 18 provided in the 535/536 for protection when operating froma power source thatisnot limited, 3-1.6 SWR - Two Kinds The standing wave ratio 1s a direct measure of the ratio between two impedances, i.e.aSWRof3to 1 maicates that one impedance is three times the other. Therefore, the unknown impedance can be either three times as large or three times as small as the known one, If the desired impedance that the transceiver wants to see is 5042, an SWR of 3 to 1 on the line may mean a load impedance of either 150 © or one of 17 (2. If it is 150 Q, the transmitter will act differently thanifitis 1702, Tn the firstcase, the power demanded from the power supply will Part Mo. 74212 November 1001 © Primed in USA “art No. 74212 November 1961 mitad in U.S.A, _ be much lower, and not large enough to top the circuit breaker, In the second case, even though the SWE reads the same, the breaker may repeatedly trip out, The SWR reading gives no indication of reactive components, nor can it separate the resistive from the reac- tive components. It is calibrated with a pure resistive load and therefore has its greatest accuracy with pure resistive loads. The SWR bridge should be used only as an indicator when attempting to adjost antenna systemstoa pure 301 resistive impedance at the transmit- ter output point, | 31.7 EFFICIENCY — Since transistor amplifiers haye a very low value of output impedance, they act more or less as a constant - voltage source, Thatis, the RF output voltage tends to remain at a fixed value regardless of the load impedance. Hence, the output power will vary depending on the value of the load, and increases as the load impedance goes down. It can be seen that à 3 to 1 SWR on the low side of 5042 will asktheamplifierto déliver much more power than a 3 to 1 SWR on the : high side, Since the amplifier does have a finite value of output impedance, the amount of power delivered to the load with efficiency will change with load. Unless the load is near the design value, the transistors will heat up unnecessarily without delivering any more power to the antenna. Recommended Reading: ARRL HAND- BOOK 3-3 IF YOU HAVE TROUBLE If the transceiver should fail to operate normally, use the following chart as An aid in determining the problem. Often the cose of the problem is an overlooikod switch/cont keypad, ral or a mistake in entering information into the SYMPTOM Check power swite Check power cablé. Transceiver dead, no Metarifumination, no display, | Chsck supply for correct voltage, POSSIEL USE h an transceiver and power supply, Receiver dead, meter and display on. | Check squelch if FM mode | Check AF, and AF gain controls. Check Phones and Ext. Spkr jacks, selpcted | Check TX ENTX | Check mieronhon Transmitter dead, meter and display on, REQUEST jumper plug on rear panel, C PTT switch, and Mmicraphone cable E connector. Received signal Strength му. | | Check ATTN swi tch and RF gain control. Main tuning knob will not change freq VENCy. | Check that the MT annunciatar | readaut, press [E Is turned off. If "LOCK" appears in - I Main tuning knob wil not change frequency, key- pad will not respond to РО. | Memory Tune mode is selec Ma résdout, audio présent, Y noise spik off and then back on, | microprocessor will have to b button with a toothpick or sf Readout pres ont, can not enter commands, | located Underneath the ta SOUELCH ontoj switches, | WILL RESET THE TIME, Us | Microprocessor May be in process of | Micropracessar may be locke E selected function routine. ted with no memory locations. dup duéto anincorect keyboard entry 2. Turn the POWER switch on the 535/ If this does not clear the problem, the Sreset. With poweron, press the RESET Milarmen-metalic object. The button is Popanel in between the ‘LAMP and NOTE: PRESSING THE RES SWITCH Clock contains BrTONenus readings after power has been removed from 535/8356, Replace 3 YDC Lithium backup battery. See section 1-8. € this approach only as à last resort. | | Display Blinking | indicates that the supply vol tagé is less than 10.8VYDC. - 3-4 TABLE 3-1, TROUBLE SHOOTING CHART Part No, 74215 Movamber 19917 Driritad Im IE A art Mo. 74212 Invambar 15981 rintad In U.S.A, el ER | LOCKE SLT CLE . | EEE r H VTA DLY E ST. VI2L 5 E WEEE ERIN Cad RTE 4 le: PUCES" E Е N PEJE = FIGURE 3-1. MODEL 535 FRONT VIEW MANEL 215 MODEL 535 AMATEUR RADIO CAP TRANSCEVER TAR TEN-TELD SEVIERVILLE, TH 37642 MADE IN USA Le TYPE AGL 2 ATTEMUATDR KEY ALY, +13.5v0C GROLUMD HO CH ANTENMA Mel LE e 3 la . В © 0000 CES ee FIGURE 3-2. MODEL 535 REAR VIEW = Part Mo, #4212 November 1997 E к. бы "La = LH va Ma Lot He я Е ici me L dd CIN E IA nia ME A Ll EL] E E ag ae. HM be FIGURE 3-3, MODEL 535 TOP VIEW 3-6 E AS LL " hates : J cr | Р i E + E Pa Ca . bi у ВОНА E Cig Ma и aa TAM E Ku, eu E НГ mle 7 TT E Te FIGURE 3-4. MODEL 535 BOTTOM YIEW Part No. 74212 Havambar 1881 Printad In USA, mme EE { | >. A ALC ST dE LT | | + +, (A 0 MT FIGURE 3-5, Ts a 3 LR чет LECE С] LA METE E] AMTIUQE a mole] Elias T Ш | а MODEL 536 FRONT VIEW ee referme per, Tr Tp | — PEFR PE o EE le ET eT mie pe pS O ARE N = . ra Ta ro De RRA) LE om HE RR EA YL ETE | ATA Er BE E E AAA a AO FIGURE 3-6, 3-8 E A Br SAH ET st o RA A i - = ЗЕ 1 dd 1; т слать LT pi PAPA TADA AA LE EE RT e A ra ba Tordera PO A o Па ЛЬланни що с Ka Do LL AC A — a A AE A EA a E MODEL 536 REAR YIEW Part Na, 74212 November 1897 Frintad [n-U SA Part Mo. 74212 November 1891 Printad in U.5.A. FIGURE 3-7, MODEL 536 TOP VIEW 3-9 № = М ПЕНЫ il | dd | ANTE В] "x AY soso Pp a ln Г! Loy = = = asa ss Ka a Ta TE ED as FIGURE 3-8. MODEL 536 BOTTOM YIEW Patt No, 74212 Movembor 3-10 Printed la US, Part Mo. 74212 Novamber 1881 CHAPTER 4 CIRCUIT DESCRIPTIONS AND ILLUSTRATIONS 4-1 INTRODUCTION The Model 535/536 are completely synthesized transceivers. The receive portion covers 100 KHz to 29.9999 MHz while the transmitter covers the amateur frequencies. A simple modification will allow transmission outside the amateur frequencies for MARS operation etc. RECEIVER EN The transceiver T/R switching on the low pass filter (81521) routes the received signal to the band pass filter, amplifier and mixer (81526). The first conversion oscillator (81528) con- veris 10 KHz portions of the received spec- um to the first IF of 45 MHz, The second mixer board (81524) filters the 45 MHz, to improve the image response, and with the second conversion oscillator converts the 45 MHz to the final IF of 6, 144 MHz. The second conversion oscillator (81529) covers the 10 KHz at 45 MHz in steps of 10 Hz. The major selectivity for the receiver is provided in the filter board (81527) where either the AM filter or the variable SSB/CW filter may be selected. The variable filter may be set to any bandwidth between approximately 500 Hz and 2.5 KHz with the front panel control. The IF amplifier (81525) provides AGC, AM detection, SSB/ CW detection, audio processing and the CW sidetone. PLL Alloscillators, first conversion, second conver sion and BFO are phase locked to the master reference of 9.9 MHz. Therefore, the stability of the transceiver depends solely on the stabil- ity of the 9.9 MHz crystal oscillator. The first conversion oscillator is stepped at 10KHz, the second conversion oscillator at 10 Hz and the BFO at 20 Hz. The pass band tuning function is accomplished by changing the second con- version oscillator and the BPO by the same amount. This has the effect of moving the filter | pass band without changing the frequency of the received signal. The frequency of the carrier for USB and LSB is generated in the PLL BFO and is determined by the micropro- CÉSSOT. TRANSMITTER The BFO (81530) provides the carrier for the balanced modulator, and the frequency modu- fated oscillator for the FM mode, Selection between the two oscillators is on the TX Mixet (81507). The SSB/CW signal, microphone audio for both the SSB/CW and FM modes and vox circuits are accomplished on the TX Audio board (81506). The TX Mixer board combines the signals from the TX Audio, sec- ond conversion, and firstconversion oscillators to produce the wanted frequency. The re- quired frequency is amplified to the output level in (81502), Low pass filter (81508) re- moves the harmonics and provides the T/R switching, 4-2 42 KEYPAD BOARD (81499) This board contains a seventeen Key matrix organized ina four by four array, with the one extra key (515) tied to the matrix | through diodes 131 and D2, Column address informa- “on from the microprocessor Ubon the Logic Board is routed viaconnectorK to U1,aoneof eight BCD decoder chip. When addressed by the microprocerssor, only one column output from U1 willbe set high at a ime. Unselected columns will remam low. AN columns are thus scanned one at a time by the micraprocessor, When a key is pressed, that keys column line is tied to is row line; thus placing a highion that row line when its corresponding column 1s strobed by U1. The status of all row lines 15 retumedvia connector] to the micropracessar, Each key thus hasa unique column/ row value which is looked up in a table by thé micropro- cessor to determing which key was pressed. PU e . y ri = RE и е: 2 vel hn Xo Tan Ч ТАМ Чао 7 ОТО ВО ОНО дай 1 ICE J REE RR a re El =r. LA E a N ar 1 т "Г т + La TO Se e | ) É Kar TU AA * ET La 1 or > DO A CE pe TEE L = I ail! | : "a Y A E „№ ая a" a RE TH Ta i PESTE E qe 1 "Te eee Но er E i. : а PRE eer LC {" nat a a 1 a a i 1 ea EE HE = =: TEA, 1 U тбл ние. FIGURE 4-1. KEYPAD BOARD =" COMPONENT LAYOUT (81499): pe ye A au <n oe : 3 E 55 m “oe | “с | “Ex e TS : = и Sin NE oy #4 El < x 1615 |14|15/12/11 10) 6 = + ul [TRENT ANA TRE Liss UD] © ELE MONT Ln ci ATHERWGEE ARERR + a ROAD o a NI ВЕНЫ Мне CS wri Lhe, = Ci, 02 1 Wi] 4A ul META = ата - FIGURE 4-2. KEYPAD BOARD SCHEMATIC (81492 ° —— [KEY PAD BOARD |81499 Part No. 4 Novamber Priced, Ir = = Я |! rr Part Mo. 74212 Navambor 1 Printed in LI, #91 =A, 4-3 LOGIC BOARD (81500) Thisboard contains the microprocessor control system, a 32 line driver, an A-to-D converter, anon-volatile RAM chip, areal time clock chip, rotary encoder circuitry, anda DC- ' to-AC inverter for the display backlighting systenl. The microprocessor, U6, isthe heart of the system, Thisis an 8-bit CMOS micropro- cessor with 25 I/O lines, an 8 K ROM, 176 bytes of CMOS RAM, a serial peripheral interface (SPI), à serial communications inter- face (SCI), and a built-in 16 bit timer. This microprocessor contains an internal oscillator whose frequency iscontrolled by X1. The 1/O lines going to connector B are used to control the two loop PLL synthesizer. Signals from connector 95 control the PLL synthesized BFO frequency, On connector 62, U6 moni- tors the TX RQ line to tell when it should go into transmit mode. When TX RQ goes high, U6 will change the frequency synthesizers as needed and insert any needed timing correc- tions before enabling the transmitter output by setting TX ACK high. Pin 230f Ubisused to monitor the +10 volt regulated line in order to detect when the POWER switch has been turned off or the DC power supply has been removed. When this happens, U7 is placed into a "sleep" mode to conservé power but still retain ris memory. While in the "sleep" mode, power for the real time clock chip, UY, and the CMOS RAM in the microprocessor, is obtained from Bl, a3 volt lithium battery. In normal usage this battery has a typical life of 1 to 3 years. When power is again turned on, with 16 asleep, transistors Q1 and (J2 generate a negative going puise on the interrupt line (pin 2) of U6. This wakes the microprocessor up and restores it to normal operation, Theinter- rupt line is also used by the encoder circait to tell the microprocessor when to change the transceivers frequency. The clock pulse from the encoder circuit is coupled via C12 to the interrupt (pin 2) of U6. Pin 24 of UG 1s used io tell whether the encoder is tuning up(high) or down{low}. The O lines going to connector K are used to drive a decoder chip located on the Keypad Board. When scanning the Keypad, the data on connector K (AD, AI} will be decoded by the decoder and cause one of the column lines in the matrix to be set high. By changing the value of AQ, Al all four columns are strabed in sequence. While strobing each column, Ué6 looks at the row information pro- vided from the Keypad matrix viaconnector J. When it detects a key closure, U6 decodes the location in an internal lookup table and ex- ecutes the appropriate command. Connector G provides signals from Ub to control the driver chip on the LCD Display Board. Power for the LCD Display is obtained from connector H. Transistors Q3 and (4 form a DC-t-AC inverter circuit to power the electro-luminescent display backlight. The regulated +10 volts input to the inverter 18 controlled by a switch located on the top cover mounted switch panel. The output of the inverter is an approximate sine wave of about 115 VAC {r.m.s.) ata frequency of about 230 Hz. Thisoutputis sent to the display board via connector I. (CAUTION: Although this high output voltage is not lethal, it can cansea shock if you touch the connector or bare leads with exposed skin). 171 is a 32 bit, serial input, latched driver controlled by U6 over the SPI interface system. Output pins 3-6 drive a four bit resis- tive D-to-A converter used to generate a VOX DELAY control voltage under microprocessor control. This is one of the Soft Key functions controlled by U6. In like manner cutput pins /- 10 drives a resistive D-to-À circuit to develop the ANTIVOX control voltage. Output pins 1 1-14 similarly develop the VOX GAIN con- trol voltage. All three voltages are sent to the Vox circuits via connector 41. Output pins 13- 18 are used similarly to develop the SideTone 4-3 4-4 1evel control voltage, which is routed to con- nector 91. Output pins 23-29 contain band infor- mation used to drive the bandpass(connector 79) and lowpass(connector 10) filter selection circuits. Tnaddition, these signals aré alsoused tp control the YCOs usedin the main PLL via connector A. The lowpass filter lines at con- nector 10arealsoinverted by Ul0 and applied io connector 3 for use with the Model 536 DELTA II low pass filter board. Output pin 30 is used to tum the BFO circuit onoroffvia connector96, Pin 31 is used to activate the TUNE mode on the control board via connector 62. Pins 32 and 33 select the appropriate filter for either SSB or AM operation. Output pins 34-37 select the appro- priate modelines via connectors 91 and 62. Fin 28 is used to generate a Spot Tone function when the REV key is pressed during CW opération. Ts The main tuning control consists of an optical rotary encoder located on thé front panel. This eñcoder generates quadrature signals (each signal being 90 degrees cut of phase). The rotary encoder produces 120 pulses per revolution of the Main Tuning Knob. The two quadrature signals are seni via connector N to U4. These gates detect the jeading and trailing edges of the signals and generate an output pulse for edge, thos multi- plying the number of pulses by four. The pulses applied to U2 are used to detect the direction of the encoder. The UP/DOWN output of U2(pinl) goes to U6tpin24). The encoder pulses are also sent to U5 which buffers the signal and then integrates it to develop a tuning rate detector. When the repetition rate of the pulses exceeds a prede- termined threshold, the output of T3D goes high, telling the microprocessor to shift to the next higher tuning step size. | The real time clock circuit consists of 179, X2, and irimmer capacitor C7. Backup power is supplied from a replaceable 3 volt lithium battery, Bi. To calibrate the clock a frequeney counter may be connected to TPL and trimmer C7 adjusted uniil the counter reads 128 Hz. If the counter has period mea- surement capability, an even more accurate. setting may be obtained by placing the counter in period mode and adjusting C7 for a period of 7 8125 mS. U%is serially controlled by UG pins 21-22. These two serial control lines also connect to and control U7, a 512 byte NVRAM, whichis used 10 store memory intor- mation. Connector 99 provides: blanking pulsés to the IF/AF and PLL synthesizer hoards. These pulses, generated by micropro- cessor U6, help reduce audio transients gener- ated by the PLL synthesizer System when a loop boundary is crossed or the frequency is suddenly changed bry a very large amount. - The serial communications interface (SCI) signalsare connected via connector Uta a Remote Control Board mounted on the rear panel, Thisallows for control of the transceiver via 4 two-wire serial interface system. The вап rate is fixed at 1200, and the transceiver address is user selectable. | 173 is an eleven channel, B-bit, A-to-D converter. Itiscontrolled via the SP interface by microprocessor UG. Only seven of the analog inputs are used, all others are tied to ground. The reference voliage for Ud is +5 volts applied to pin 14. Analog input number 1 (pin 1) is tied to the + 13.5 volt supply line. Whenever this line falls below about 10.5 volts, the microprocessor 16 causes the entire LCD Display to blink, indicating alow voltage condition. Analog input2 (pin 2)1s connected to the front panel mounted FWD/ REV switch and is used like an extra input pin for the microprocessor to sense the switch setting. Analog input 3 {pin 3) 13 the 5-Meter signal developed on the [F/AF Board. The relative value of this voltage is displayed on the LCD Bar graph when in receive mode. Analog input4is theFWD power signal from the SWR bridge and is used to indicate relative forward Part: No 1 = Nowembear Printad In Part Me, 74212 Mevarmher 189 Printed in LISA. output power on the bar graph display. In like manner, input 3is connected to the REV power signal viaconnector 28. Analog inputs band 7 are routed via connector F to the PBTand RXO potentiometer circuits, respectively. Voltages developed by the circuiis are analyzed by microprocessor U6 and used to adjust the syn- thesizer circuits to the correct frequencies for IE, FE F E E Er т Lu 1 а 1 — re ева r = r all control settings and modes of operation. Regulated +3. 6 volisis supplied by U8 through isolation diodes D2 and DY. The Logic Board also contains the 3VDC lithium battery that supplies power to the built-in 24 hour clock. See paragraph 1-3 for battery replacement. ua MA KA FIGURE 4-3. LOGIC BOARD COMPONENT LAYOUT (81500) Part bo, 7d. November + Printed Ir LU hostel — quvoa 91907 a YET SAT AA FT r [Hl SLR CT Wah E Cr TT a AT FIGURE d-4. LOGIC BOARD SCHEMATIC (81500) Part Mo. 74212 Havarbar 1981 Primed In U.S.A 44 LCD DISPLAY BOARD (81501) This board contains a custom designed transflective TN type LCD Display anda sur- face mount LCD driver Ul. The display is multiplexed at about a 100 Hz rate by driver Ul. Thereare fourbackplanes on this display. Information to control the driver is provided serially via connector GG from the microproces- sor located on the Logic Board. The multiplex frequency of the driver is determined by RZ Alma [LETT] FÉ = я [+ 1 | A TE Da ' Baljit ut, =. il TR | ха. | EE сне por JE | E. Ч ue E a a a ILE hem ar - HE FE rare ; п “=== у note, noo ne = h . "a r and is set to produce an optimal rate of about 100 Hz. Resistor R3 and capacitor C1 provide a power up reset pulse to the driver, which 13 powered from +5 volts via connector H. The remaining resistors and capacitors comprise a voltage divider network to develop the correct backplane levels for the driver. The display backlight is powered from the Logic Board via connector, Rl od a el alla preg eh ntti FIGURE 4-5. LCD DISPLAY BOARD COMPONENT LAYOUT (81301) TE SET" Bee] LLCS {10510 ‘08 AAS] do 3 FFE — YO Sea — LAO pS HG Ca В ЕН = W'| =pifrE-— ETE vd iD dF aH ur QL-21—0+- de JE -I- A a Dal Ad EE lmao |= me — JH mE EA 61-+ М MICA O2 757 JA Эн ON yA neezt-t+—ib Ib De -YÉ EE1-4-8b - ei MUA a [4] E YE Ef 10-54 ‚ан = «Б-р БЕ TE] BO OI 111 xE 3 ce -36- 06 don Y Lyin rf Зи — нат ail}! 15 -] EV 5H gil JH my wt LIT SI AEM qa AYTO MOLES Ь iH Bs Ta Lh It ART ETT SO NO SNIE ETE A FILA SCAN БТ Ser ГЫ i mee | len re carie e =оызызазы| = 6. LCD DISPLAY BOARD SCHEMATIC (81501) FIGURE 4- Part Mo, 742 Mowvambor 11 | all daa |= El Part No, 74212 November 1981 Printad In USA. 4-5 ARGONAUT II 5 WATT POWER AMPLIFIER BOARD (81502) (DELTA II Low Level Driver For 100 Watt Amplifier Board 81503) This RF module has three stages of amplifica- tion, bias compensation and frequency level- ing networks to produce five watts and uniform - gain over the frequency range of 1.6 MHz to 30 MHz. AMPLIFIER Ql is a broadband class A amplifier with the input impedance, gain and frequency response set by the feadback elements CZ, LI, RS, R3, R4, and C6. Q2 and Q3 form a broadband class AB linear driver stage with input and output impedance matching accomplished by broad- band transformers T2 and T3. RC networks R7, C11, and R10, C13 in conjunction with feedback networks C12, R23, and Cid, R13 control the input impedance and flatten the gain variation of the transistors over the fre- quency range. QS and Q6 are used in a five watt output class AB stage, Input impedance and gain variation with frequency are con- trolled by RC input networks and RF feedback similar to the driver stage. Broadband trans- former T5 matches the output stage to 50 chms for driving the transmit low pass filters. BIAS Bias for both stages is temperature compen- sated, to maintain a relatively constant operat- ing point, by mounting the bias reference di- odes TY, DZ, and D3 in thermal contact to the heat sink. The temperature dependent voltage across each reference diode 15 added to a portion of the bias voltage and sum 15 used as the bias voltage. Alignment: The final amplifier bias volt- age is set by connecting a current meter to the “BIAS TP" connector and adjusting R17 fora reading of 50 mA, Afteradjustment, remove the meter and insert the jumper. CONNECTOR | FIGURE 4-7. . 5 WATT POWER AMPLIFIER BOARD COMPONENT LAYOUT (81502) 4.9 Part No, 74: Mowember 1 Printed In U COSLE| OS Yd LIYAM S ODYY | ELSE 50 = Aria a Tal greta ls] +0 PITEIST COTO GERNE 1 «ОО МА 50—10 UE RSF SAO AT TIMES IAE SLANT MN INEA dj Sour A TIME VAT] EPA SSA SEI] ION LU SUEDEVEOREOSY | 0350 L151 SYNE] 0NI 43 mi Ts E Sie das 10 OL LL Le] CH +L oil vo tE iy | DH Le TT 420 LED Ja LI Or oy De | EI ods 10 GC E 113 AGZ/IT an 4 ' ET yuige = 6519) | [ео ¿E En | 24 195 PL een a " Ea Eo dL 5710 FIGURE 4-8. 5 WATT POWER AMPLIFIER BOARD SCHEMATIC (51502) 4-10 Part Ma. 74212 Movatnber 1681 Pimtaëd in U3. A. 4-6 DELTA П 100 WATT AMPLIFIER BOARD (81503) The 100 watt amplifier board bolts to the inside of the rear panel die casting. Besides the amplifier stage this board contains the mam power-on relay, KI, which is activated by the front panel power switch, RF power transistors Q1 and (2 pro- vide about 13dB of pain to boost the > wati output from the driver stage up to 100 watts out. Transformers T1 and T2 perform impedance matching and other components provide feed- back to help flatten the frequency response of the amplifier. The base bias voltage is developed from transistor Já, This transistor 18 bolted to the heatsink so that the base-collector junction voltage drop follows the temperature of the RF al 73 E A - E E : transistors. U1A and Q3 form a current ampli- fier stage which provides a low impedance source of base bias. Comparator U1B monitors the junction voltage at Q4 and switches on the cooling fan output at a preset heat sink temperature deter- mined by R19, Alignment: The 100 Watt amplifier bias voltage is set by R15. Place current meter in series with the DC power supply lead, Set R19 to minimum position(full CCW}, Unplug cable 2 from the 5 Watt Power Amplifier Board(81502). Set front panel RF drive control to zero output. Placé thé Delta I in "TUNE" mode and adjust R as for 500mA above idle current. FIGURE 4-9. 100 WATT AMPLIFIER BOARD COMPONENT LAYOUT (81503) Icosie| 08 wa LiYM OO NY 1730 HIDE Ti Hass MA If QUE FN 50 4+|G550M SOC LEJENT a am DO EPT ELIO Y ISLHI 0 DL id E EST SAO MW Tr a TE E OMY mi Tr SV QUE (JO fiat ood AN ZONES Moran ES TAO Sea The ON ENTE TECLEA. Cos 24] SEOLYADIEIÓ AMELIE + А jua =] 01 Ao Ned) | GO FIGURE 4-10. 100 WATT AMPLIFIER BOARD SCHEMATIC (81503) Part No. 74 Haverrmbar 1 Printed Im U 4-12 Fart Mo. 74212 Movarmber 1551 бен | 1LÉA. 47 TRANSMIT AUDIO BOARD (51506) The TX Audio board contains the mi- crophoneamplifier, speech processor, clipper- filier, balanced modulator, VOX circuitry and the CW/55B switching. Microphone Amplifier Integrated circuit UlA amplifies the micro- phone audio (connector 39). FM pre-empha- sis (connector $) is obtained by selecting an Rf C time constant in the microphone amplifier feedback loop. Speech processing (connector 44) increases the gain oftheamplifier by 20 dB and activates an andio AGC circuit (Q1, Q2, and QF). ‘The gain is setjusthelow the clipping point of D2 and D3. The clipper removes any avershoot that may occur inthe processor. The signal is filtered (low pass filter U1B) to re- move unwanted high frequencies. Modula- tion audio for the FM mode is available at connector 43 and adjusted by potentiometer R28. Front panel MIC GAIN (connector 38) provides the audio for the balanced medulator. The output of the filter also is used for the VOX circuits (U3, Q7 and OB), SSE Modulator Integrated circuit U2 is a balanced modulator. The carrier signal (connector 35) is applied te pin $ and the audio modulation signal to pn4. In the CW mode, pin 4 is unbalanced with a positive voltage, SEB voltage present al con- nector 47 accomplishes the necessary switch- ing between CW and SSB. In the SSB mode, voltage present at the SSB pin of connector 47 biases diode D13 connecting the arm of the MIC GAIN eontrol to pin 4 and activates QF to remove the CW voltage from pin 4. In CW the SSB voltage is not present and the amount of unbalance (CW output) is set with control R32 at 1.8MHz. The cutputof the balanced modu- lator is buffered and amplified in Q13 before being routed to the filter switching circuits. Alignment: CARRIER. Connectasuitable dummy load to the antenna connector. Switch the transceiver to 20 MHz and push the TUNE button. With the PWR control set maximum clockwise, adjust the carrier potentiometer, R32 for amaximum clean CW wave form with the ALC LED on. | CARRIER BALANCE. Connect an oscilloscope to the output and the mode to USB. Close the PTT line and adjust R31 for minimum carrier, FMMODULATION, Applyan audio frequency of 1000 Hz to the microphone input and adjust the level to 30 mv, Usinga deviation meter, set potentiometer R28 fora deviation of 5 KHz. AUDIO PROCESSOR, Apply an au- dio frequency of 1000 Hz to the microphone inputand adjust the level to 30 mv. Turn on the processor and, with an oscilliscope connected to the cathode of D3, adjust R16 until the sine wave is just below the clipping point. Filter Switching Tn the OW mode, the crystal ladder filiers are not used. Diodes D10, D!1, and D12 are biased on from veltage present at connector 16. Diodes D8 and D9 are reverse biased, disconnecting the filter. The CW signal is passed through the diodesand amplifier 13 to output connector 33. In the SSB mode, diodes D& and D9 are biased on by QI0 and the double side band signal is routed to the filter board through connector 45. the return signal is applied to connector 46 and on to 13 and the output connector 33. 4-13 4-14 R16 UN R28 Fre CTE a dpi | г = mm BER АА ни he =| Pr нЫ Я | x = = - L 1 An, 9 a A INL alerta Art die AL TEL E] hrs tido AL of LIE ia lía Eo pin ETE ME U3 FIGURE 4-11. TRANSMIT AUDIO BOARD COMPONENT LAYOUT (81506 RER PP PRE q DATA БЫ Ве ве / ALTAR R32 Part No. 71 Novembar * Printed In L Fall: -g8 éign Xi " | | wr gn ol Gm ew ori A557 Lil 5554 FLÉCAEDLO— ISO GrLFH rLO—OUSYÉ—LI mp DT Se 15 Or ÉT Tar (ref LAA NIN AT RANI ST de mas sx TANYA) Fe Folks Ler CO EN iS Led TES + [en 15% SORT Jans al ARI xr — La MAD EUA. 1 Lai L Bi {a 1 + aL ==: EI ERA : CT TH ам Fr =. Л FLA Fig” " MT LH Е I ee] 1 | Teen Fra 6 gl gro} Tel EF ILL rn ГЕ = 4-15 [I FIGURE 4-12, TRANSMIT AUDIO BOARD SCHEMATIC (81506) cie 4 pq 0 КОИ Part Ma. 74 Navembor Prirted In 4-16 | 4-8 1-8 TRANSMIT MIXER BOARD 181507) Mixer e TX Mixer board combines signals from the carrier generator, second injection oscilla- por and the first injection oscillator to produce he wanted frequency. It also contains the hecessary circuitry to provide ALC control. The FM signal is applied to connector 32, the $SB/CW signal is applied to connector 33. Control voltages from the Logic board are available at connector 34 to select the desired hode. Diodes D3 and D4 form an attenuator that is used to control the gain of the transmit chain (ALC). The signal isthen mixed with the d conversion oscillator present at con- hector 26. The resultant 45 MHz signal 18 amplified in Q2 and filtered in 1.2, 1.12, and 113. The45 MHzsignalisthen mixed with the first conversion oscillator, présent ai connector 25, the resultant frequency 18 amplified in Q3 d 4. The filtered signal is available on onnector 14, Alignment: Disconnect the TX Mixer output {connector 14), Connccta spec- m analyzer to the output tap on L13 (TP on ard), Put the transeeiverin TUNE and adjust E8, 1.12 and L13 for maximum signal at 45 MHz. Output should be approximately -10 dam. ALC Forward and reflecied voltages, from the SWR bridge on the Low Pass Filter Roard, are available atconnector 5, Thereflected voltage is applied to QB and the buffered output to connector 28. Potentiometer R33 calibrates the SWR read on the meter. The forward voltage is buffered in Q6 and Q7. "The output of Q6 is available on connector 28. Potentiom- eter R34 calibrates the forward power meter. Capacitor C18 and R25 form the ALC time constant. The ALC voltage is compared with a preset voltage in U1 A and the output confrols the ALC attenuator. The preset voltage is adjustable from the front panel PWR control. The Power control plugs into connector 29. UÍA compares the ALC voltage to a reference and drives the ALC light at connector 27. Connector 23 and diode D8 are used only in the Delta and sum the final collector current into the ALC attenuator as an over current protection feature. co ARGONAUT II Alignment: To set forward power, connect a wattmeter and dummy load fo the transceiver output. Turn the PWR control full clockwise and adjust R11 for 5 watts at 14MHz, Adjust R34 uniil Y bars are showing on the bar graph meter. Switch to REF and, with 225Q cad, adjust R33 Гога 2:1 SWR on the bar graph. | DELTA 1I Alignment: To set for- ward power, connecta wattmeter and dummy load to the transceiver output. Turn the PWR control full clockwise and adjust R11 for 100 watts at 14MHz, Adiust R34 until Ÿ bars are showing on the bar graph meter. Switch to REF and, witha 25 10ad, adjust R33 fora2:1 SWR on the bar graph. SETTING CURRENT LIMIT: Attatch a suitable dummy load te the antenna output, and tune to 14MHz, Insertan ammeter in series with a positive DC power lead. Pull connector 3. Press the button and adjust R24 for 22A on the ammeter, Part No. 742 November 1 Prentet Mm VU. TN R34 FIGURE 4-13. TRANSMIT MIXER BOARD COMPONENT LAYOUT (81507) Fo November 188° | | 4-17 Printed in USA, RAH 11 wlan) dE ; : oT f 2 | le =| vo a e 411 ; Ml ESF SALE y DONS SANT {HM SAMA Ce A SMS E SOFIA AIRE CRE IBIS mea | SN 15 CNCLYNOmM=0 ZOHIHLIIE] QU ITE Part No, 74: November 1 Printed in Li, FIGURE 4-14. TRANSMIT MIXER BOARD SCHEMATIC (81507) 4-18 Part Me. 74212 Mowvambar 1981 Printed in U.S.A. 4 4-9 DELTA II LOWPASS FILTER BOARD (81508) The DELTA II Low Pass Filter board uses a novel arrangement of six filter sections hooked end to end. The unfiltered output from the transmitter travels through the lowpass sections until a band select relay extracts the signal and routes it out through the SWE bridge and on to the antenna. One of six band select lines frem the microprocessor activate he appropriate relay so that harmaon- ics of the signal are filtered out. Transmit/receive switching consists of reed relay K1 and diodes DI and 2. During receive the relay opens to disconnect the low pass filters and R voltage at connector 6 turns en transistor Q2. Current from Q2 drives D1 and D2 to create a loss path from the antenna to the receiver front end at connector On transmit, K1 connects the transmitter out- out io the antenna. Meanwhile the voltage doubler diodes D2-D6 generate a large nega- tive voltage from the transmitier signal. This voltage reverse biases D1 and D2 to keep them turned off. The small amount of transmit signal that does leak across the diode switch pets shunted to ground by QT. Transformer T1 combines a current sample from the one turn link primary and a voltage sample from the capacitive divider of C12 and C13, The output of T1 1s rectified and filtered lo generate two DC outputs that indi- cate forward and reflected power. These out- puts at connector 5 drive the front panel meter and provide feedback for the output leveling ALC loop. Alignment: Set the transmitter to 14 MHz. Connect a DC voltmeter to REF on connector 3 of the TX Mixer board 81507, With an insulated tuning tool, adjust C12 on board 81508 (low pass filter board) for à mini- mum reading, FIGURE 4-15. DELTA II LOWPASS FILTER BOARD COMPONENT LAY- OUT (81508) 4-19 Part Mo. 7421 Printed tn LEE November 18 BOS IE guwoEe 4471 11 Y1199 - ——— CES wa И 16—50 —# 5 ASH GLESHE Zn + ECO nv in LEA БЫ BELINL = 50 LO0+HL ELO ML ACI LM A N [HT SAM LA O ALA E ee FEHR A ZI CH Jr WTF FRITS | ZOLL] ERTEILEN REN wee | [E EJ Cin bol Lor TEA uo 0 Ya ER = | [SEE 2 —1 | FS 11 E — ETA = i J a | на - ml an ~ Be ; т " ‘ © a | EE FIGURE 4-16. DELTA 1l LOWPASS FILTER BOARD SCHEMATIC (81508) 4-20 Part Ne. 74212 NHovambar 1381 Printad in U.S.A, A ] 5 7 25 0 D — Mod | 2 J 4 2 AUDIO IM MIC MUTE TX EH Tx ПЕД E PT» RY MUTE a DE. T LINE AUDIO 7 END i DELTA | ACCESSORY CONNECTOR Bh. FIGURE 4-17, DELTA II ACCESSORY CONNECTOR BOARD SCHEMATIC (81516) | С | 0 OE В = Э о | sl ® 10K oT] o A {Lo {eue 5 5 REMOTE al ; 3 jo > © 10K 3 KEY (a E + a | 5 REFEREHCE DESICHATORS LAST USED 81.03.02 _ ARTE. LR DENIA CEM CAPACITANCE IN MICROFARADS (uf) 2MNOUCTANCE IN MICRO— AENSYS (MH! IITESISTANCE IN OHMS +57 154 = 21,43 2097 IPHONE CONNECTOR BD. 81517 DELTA li FIGURE 4-18. DELTA II PHONO CONNECTOR BOARD SCHEMATIC {81517) 81 = 4-21 4-10 SLIDE SWITCH BOARD (81518) QSK FAST/SLOW AGC FAST/SLOW AGC ON/OFF ATIN LAMP (DIAL) — SQL , FIGURE 4-19. SLIDE SWITCH BOARD COMPONENT LAYOUT (81518) A Ne о с D E 1. — REFERENCE OESIGNATORS LAST USED 57 | © |. CDs | | RESET 4 MIEL VINS OTHERWISE SPEOICES - . MCAPACITANES Af MIEPOCARADS fer EMNOUETANCE 14 MICRO HENGYE MEHY IRESISTANCE IN OFS 258 1 Adm © Fi AL 1N7514 5 BF LM2931-75 no INA] AH (3H 0 uy | ns с | 4 ‚© © ga | © 55 — e : - OSk, AGC SEAL oO | I | i SLIDE SWITCH BD [81518] FIGURE 4-20. SLIDE SWITCH ECARD SCHEMATIC (81518) 4-22 Part Na. 7421: Novembor 108 Printed In 1,5., AN 4-11 PUSHBUTTON SWITCH BOARD (81520) PROC ON/OFF N.B. ON/OFF VOX/PTT FWD/REF FIGURE 4-21, PUSHBUTTON SWITCH BOARD COMPONENT LAYOUT (81520) ~ A, В C | С Е Fa TD Е rr Sd C = A ! | [REF] 7 4 E hoi Laa TE“ “0 | CHE D Da az i - Ri - 3 2 > [OFF | 1.2K 2.2K 1 niet a pi i E. a "E PON NL - , TS Es 4 [dni E © REFERENCE DESIGHATORS LAS? USED _ R3.L354 i NOTE. LESS (THIRWEE ВЕСТ EARALI TANCE у ОЕ АРАБ Lo?) 2 INOSC TANCE i WO HERR YY eH) E, RESISTANCE IN QS L55 1/40 a MED TITAN PUSHEBUTTON SWITCH BD.[815201 FIGURE 4-22. PUSHBUTTON SWITCH BOARD SCHEMATIC (81520) pe Ts Area bn LE. 4-13 4-24 4-12 ARGONAUT II TRANSMIT LOWPASS FILTER BOARD (81521) The low pass filter board selects the proper filter for reduction of harmonics, pro- vides a bridge for forward/reflected power readings and does the T/R switchin 2. FILTER SELECTION: RE power from FA board 81502 is applied to connector?, The frequency spectrum between 1.8 MHz and 30 MHz issplitinto 6 bands. Each band hasa iow - pass filter, selected by signals from the Logic Board, to remove the unwanted harmonics. Diodes D4 through D15 select the. filters. Diodes D1, D2, and D3 form a voltage tripler, powered from the RF input, that produces a DC voltage which is used to back bias the unused switching diodes. SWR BRIDGE: Bridge transformer T1 Provider a voltage proportional to the forward and reflected power. These voltages are used + 101 control of the ALC function andare avail- able atthe meterasan indication of the forward power and the load SWR. Alignment: Set the transmitter to 14 MHz. Connect a DC voltmeter to REF on connecior 5 of the TX Mixer board 81507. Wilh an insulated tuning tool, adjust C41 an board 81521 (low pass filter board) fora mini- mum reading. ТИК SWITCHING: Transistors Q7, QR, di- odes D16, D17 and relay RY! provides the Ty R switching function. Dunn g transmit a high négative voltage, ffom the voltage tripler, is ed to thejunction of D16 and Di 7 essentially opening the path from the antenna connector to the receiver. Transistor US shunts the receiver input improving the isolation between the © transmitter andreceiver input, Durin g receive, R voltage, by way of transistor O7, biases the diodes on providin g a path from receive to the antenna connector. C41 Part Mo, 74917 November 1583 Printed in iS. A |S LE Ja 2d] |! CHF че + Ml ack Pi Tru FISGÓN — gb 005 SOY — o ут иу I са DEE GIS 9NE - OO Dr I EI ZU | 200464 — zLD'SLO a 491 | LOTA = SO Geox IEEE — 610 — Dem Ok +H — Себе f E ET SPA A ЗОНЕ ЭНН Ни) А ВЫ ОБИ 6 RAI 4574 MY ET ida TE Г ылеевачелтеиессочев | [1950 451 SI Ja | E г. = 4 A Clare] i of STH ua i GEI бо —5 +1 г SHAG si 1337) 1 3 я EST] EZ pr rd 6-1 Lie Gr-5Z D] Leo DEB" Hr = a о cr LÉ сло т E EL LA Di a — A — A | | ig WET ro i ol | ID : HE £3 a E r a. ; & y BLE hfs] _ ; Azur Lis „a : | , ss] om E PILES: EMT SAT En _ ea HER Jr y 1 We : | £EH OL | pe | 20 ANA le * “| | дея я [ A eit, i iol Hl Ij ; E IG al | | ЗЕ t dh dl Mn IZ TE Los ATH UT LM ||" Ш ce ] : e = | ml] Pig O4 = wo] di fi) Sy JXl3H LEr 7 Cra Trim 11 Mi | Loi AA e Е e an] Ца | OLI E) oo &|(} Bea че Ë a [| Lem E bY POFENHELLY an и? 10 я | L 1 | - @ dq rr ' E de | ay rail ААА mu ZE rt de ri a 4:25 FIGURE 4-24. TRANSMIT LOWPASS FILTER SCHEMATIC (81521) Fart Mo. 74212 941 Noyvambet 1 Printad In USA. 4-13 UPPER POT BOARD (81522) | NOTCH | RXO (Receive offset tuning) PBT | IF BW REFERENCE DÉSONATHRS LAST USER HCAPACITAN CE 60 FICOFARADS (nf) | 5 ZMNCUCTANGE W MICRDHEMRYS jan JIREEISTANCE i QUE 245 Uan | | 9102 Mess UPPER POT BOARD [87522 FIGURE 4-26, UPPER POT BOARD SCHEMA TIC (81522) ña Мо. Mz - Ovembar 1497 4-14 : Printed in 1,55 ‘art Ho, 74217 lo vembar TSA1 inked im 1.5.4, 4-14 LOWER POT BOARD (81523) PWRADJ FIGURE 4-27. LOWER AF GAIN, RF GAIN ALC LED MIC GAIN POT BOARD COMPONENT LAYOUT (81523) A В La — 2 a a E ar GT TETE 8815.59 99 9 ole 7 | | L J J - Lo 10€ [FE] 4 REFERENCE ODESGMATORS LAST USED RA A MOTE, UNLESS OTHERMREE Бесс NUEAPACITANCE IM FRICOrd 2408 (of) É)INGUCTANCE 19 MORO DENEVE Ga 5 IRESISTANCE 17 UMSS 158% 1/44 Су ALC A | ALC E Er. ALC = © El 3 2 Era uE 5S5E=t6iñ 1 E? y |? 9 9|@ i R3 | OK i Ta; | A | FF Pur] LOWER POT BOARD 51523 FIGURE 4-28. LOWER POT BOARD SCHEMATIC (81523) 4-27 4-28 4-15 SECOND BLANKER MIXER (51524) / NOISE A balanced mixer Converts signals from the first IF of 45 MHz 14 6.144 MHz, provides an Output for the noise blanker amplifiers and contains the noise blanker gate. с; | The 45 MHz signal (connector 76) from the first mixer is matched to the filter РТ. by Li, CZ, and Ci. The filter OUtpui 15 matched with L2, C3, and C4 Lo the input cirevit of the balanced mixer (Qland Q2). The 2nd conver- sion oscillator {connector 98) is applied to the Source of Q1 and 2, Balance is obtained with the potentiometer ip, the source. The Output is tuned to 6.144 MHz and 18 routed through the grounded gaje amplifier Q3. The amplified output is then routed through buffer O4 to connector 73, It is also routed to the tuned circuit Lé, C17, and C18. T1 ; L2, and diodes D1. through D4 form the noise blanker gate, The diodes are forward biased from the pulse EENerator on the Noise Blanker board 81544 through connector 77, When à noise pulse jig formed, tha voltage at Connector 77 drops to “ELO and the diodes are Teverse biased by the voltage divider R13 and R14. Output for the 2nd IF board 81577 is through connector 71, Alignment: Connect an AC voltme- ter to the audio OUIPULOT the transceiver. Con- Déci à signal Bénérator( 14.000MHz, USE) to the antenna and ser the frequency ang ouÉput fora reading of 10dB above the noise, Tune Li,L2, L3,L4, Ls and L6 for maximum an the eter. Reduce the Бепегают Output as needed to keep the andio si nal approximately 10 dB above the noise, Connect a Spectrom analyzer lo connector 71.1 MCrease signal generator nk] signal appears on the spectrum analyzer. Ad. Just R2 until the second LO frequency (38.8542MHz)ig nulled. Part Na, 74712 November 158 Printad in Ss a recio) Ex PUL т 1-1 -5 y MH + [5950 o OIE со- и carre FO MET SOT SALMO Ar ISE SEI CH SNA MTY № ЭМ INE 10) Sar A SH ERE ESTER TA A A IN 035M 15% SH0LYHNDISE] 209242438 МГ ЗНАЕТ Хы 5 | | FIGURE 4-30. — | SECOND MIXER / NOISE BLANKER SCHEMATIC (81524) 4-29 art No. 74212 lovomber 1591 mad in LISA, 4-30 4-16 IF / AF BOARD (81525) TheL.F. Audichoard accepts a signal at a frequency of approximately 6.144 MHz, amplifiesit, detects itand sends it through the various processors to the audio power ampli- fier. The board also contains the side-tone circuit for CW and the necessary AGC cir- cuitry. | ТАСС The 6.144 MHz IF signal enters at connector 74 and is amplified by grounded gate FET Q1, integrated circuit [F amplifiers U1 and U2, and emitter follower 32. The output of Q2 drives both the product detector and the AGC circuits, Diodes D3 and D4 develop an AGC voltage from the IF signal. The AGC voltage is level shifted by zener diode DJ so that gain reduc- tion in U1 and TU? will start as soon as an IF signal is present. The AGC voltageis buffered by {4 so that the attack time is preserved when charging AGC time constant capacitors £24 and C23. Fast AGC is available with capacitor C25. Connecting the negative terminal of C24 to ground through connector 86 provides slow AGC and grounding the base of (9 removes. * all AGC. The AGC line is connected to 710A where itis compared toa preset voltage and the output of the comparator drives either Q5, which adds additional AGC in the IF, or Q7 which reduces the gain of the first RF amplifier when in the AM mode. The preset voltage is set by R13, Alignment: IF; Set the transceiver to 14.000 MHz and connect a signal generator, set for 14,000 MHz, to the antenna connector, Connect 2 meter to measure the audio output. Remove AGC (switch on top cover) and apply enough signal to obtain a reading on the audio meter, Admst L3 and L4 fora maximum read- ing, Be sure to reduce the signal from the generator, when necessary, to keep the audio reading below clipping, Delayed AGC: Applya 1.5mV, 30% modulation signal to the input of the. trans- ceiver and, with a voltmeter on the collector of Q5(cathode of D1), adjust R15 until the volt- age startsto drop. This voltage should be set at 8.0 volts. This will insure complete quieting of Ul and U2 before the delayed AGC is acti- vated. (Note: the S-mtr must be recalibrated after any adjustment to R15) 5-MTR The DELTA II S-mefer is a bar graph design. The AGC voltage is amplified in U10B and sent to thie Logic Board via connector 85, The Logic Board has a look-up table that is com- pared to the voltage received from U10B and lights the correct number of segments on the meter, Alignment: Apply a 50 microvolt signal to the antenna connector and adjust R93 for 5 © on the bar graph. AM Detector The AM signal is taken from the output of U2. Transistor Q3 operatesas the AM detector, Q3 is an emitter follower detector biased to the point of conduction by D2, The output is a reproduction of the positive portion of the AM carrier, Capacitor C23, C31, C32 and resistors R26-R29 filter the carrier and set the audio frequency response, | Product Detector The product detector, U3, is used to demodu- laie S&B and CW signals. The BFQ is applied to pin Zof U3 via connector 93. TheIF signal 15 irom a resistive divider, R34 and R35, that sets the level for minimum distortion. The output of UJ is {filtered to remove the IF frequencies and set the audio pass band, The resultant signal is available for the SSB mode and is also sent to an additional filter for CW, U4A and U4B form a 1KHz low pass filter for CW, This removes much of the high frequency hiss and noise making it more pleasant to copy СМУ. Mode Selector USA, USB, TSC and USD are solid state switches operated by the Logic Board {con- - niector 91}. Ttselects either the AM, SSB, CW or FM signal and passes it on the audio stages. Part Na, 7421 November 18: Printad In US Part Мо. 74212 November. 19591 Printed In U 5,4, Notch Filter The output from the mode switch integrated circuit, US, feeds a switched capacity notch filter, U6 and U7, The frequency of the notch is set by the front panel control via connector 80. The control adjusts theclock frequency of 6 which determines the notch frequency. Audio Amplifier Output from the notch arrives at the audio amplifier after passing through the volume control (connector 88). Audio output is split hetween either the speaker/phones {connec- tor 84} or the anti-vox circuit (connector 40). CW Sidetone & Alignment CW offset {the difference between the trans- mit and receive frequency) is determined by the microprocessor and, in this transcerver, 18 set to 700 Hz. The sidetone is generated in USA, and keyed by Q12 and USB. The frequency of the sidetone is set by control R72 and the jumper in the ST socket. This is an internal adjustment and should be set to the CW offset frequency of 700 Hz, The range of the sidetone oscillator is approximately 400 Hz to 700 Hz. Tf you arenot using dual Y FOsin the split mode, the sidetone may used to net your transmit frequency to that of the station you wish to work, When inthe CW mode, pressing the REV button will produce the sidetone without the transceiver going into transmit. Tune the incoming signal to match the sidetone frequency and you will be transmitting on the received signals’ frequency. If you de not like to copy a 700 Hz cw note and don't care about thenet function, simplyremove the bottom and adjust potentiometer R72 and ST plug to a pleasant tone. If you wish to retain the spot tone feature, check the sidetone frequency that you have picked with a frequency counter and set the RXO control to the difference between the frequency you have chosen and 700 Hz, If you have picked a higher fre- quency, set the RO control to the + side, ifits a lower frequency, set the control to the -side. Since RXO is defeated when you press the REY button it is important to remember te match the tones by momentarily pressing the: REY button and not to match the tones while the REV button is pressed. 4-31 4-32 FIGURE 4-31, IF / AF BOARD COMPONENT LAYOUT (81525) le ae ie a WJ E 3 I= a + al gr q Part No. F421: MNovarmbar 199 Printed m LS. ezcia] Ouvog 1v/4 | | E J w= ap’) ITF SAM A DEE A HN COUT A JOYS E 4 Serrure Au a DL EET ao {ENT 1573 BHILYHIEIR Rhea A =; ir LM] 1 da "PI FE Le + ly +80 F TECH $ a Enel Ч Arl¥H| ak НЫЕ HEY BIST ald A nin Lig'Lig IO Oe En HAT] KO En In SOON EN ELO voir EA DEN Haste] IMMER E Tor £n ENT OECLON EMI IH AOL 1% "| - À La vai ZINN 3 2 | HZ Ta un : = qu Ш = y a | + os | г) | БЫ + ag | A Г 153 E и a Ё TI |- EH a | г) | Г CI | LM 2 | 0 dh dre One Mi Tn J fr ors pa = ro La = He DIe+ “я НУ adas o | Lidia 62) TARIFS E FIGURE 4-32. IF / AF BOARD SCHEMATIC (81525) 4-33 << Nm aa 9 + 1 Part Ne, 7 MNovambor Primtad In 4-34 4-17 BAND PASS FILTER / FIRST MIXER (81526) Tmscircuit module accepts the signal from the antenna, filters it, amplifies itand mixesit with the first conversion oscillator го produce an TF of 45 MHz. | BP Filter: The signal from the an- tenna is passed through a 30 MHz low pass filter (L1, F2, C2, C3, C4, CS, and C6) and a 1.5 MHz high pass filter (L3, LA, L5, Lé, L7, C8, and C9) before being applied to thé ama- teur band filters to eliminate an ¥ possibility of signals outside theamateur bands from causing interférence. For .! to 1.6 MHz general coy- “Tage receive, the signal is ronted around the high pass filter and through another low pass filter before reaching the amplifier. The other amateur filters are selected by signals from the Logic Board (connector 73) and diode switches. - RF Amplifier: The RFamplifier con- sists of two J-310 FETs(Q1, Q2 in parallel in & grounded gate configuration. This produces C4 an amplifier with good interceptand low noise. Diode D18 is used to reduce the amplification on AM onlv. Mixer: The mixer consists of two J- 310FETs(Q3, 4) inapush-pull configuration with the gates connected in parallel. This produces a single balanced mixer with good dynamic range and low noise figure, Alignment: Capacitor C4 is used to setanotchin the 45 MHz IF. Connect a signal generator to the antenna input and tune it around 45 MHz until a signal is heard. The Output level may have to be increased to 100 micro volts or more to be heard, Tune C4 for a null, The mixer balance is set by potentiom- eler R23.Connect signal generator (14.000MHz, USB) to the antenna. Adjust signal for 10dB above noise. Connect spec- trum analyzer to connector 76 and adjust R23 to null first LO + sipnal frequency(59MHz), The output of the mixer, 143, is tuned for Maximum on a weak signal. FIGURE 4-33, BAND PASS FILTER / FIRST MIXER COMPONENT LAYOUT (81526) Fart Mo, 74212 Movermnbar 70897 Printad m USA 92518] "08 ¥3XIW 151/448 | | | ; - col +52 WL acl x a ss E г] 7 a i HT DOL A ' — CL" = EE Hc OE € HZ LO E J pa +14 mpg les [Tay crea. © DA EH +19 {ex 15] EZ НРБ L10-19 ; ны re i cu 8 ela ы FIL 3507 Scie Hy vof Л E SEF ной AN IAS ZA E due = Rie aa БЕЯ nl NEL SAT FRITH E Zla gb ES 19] SREY IO AV IA y = wih gx Ma cé O6E sr | el Doi sil =rEzto End NT any DEE]; — i {oe wa ES | E GZ7 EEK € | СОНЕТ Бак: ЭЕсы | he |= — E Ho | z-e" [6250 157 Shôrerarsss 504357474| Tiro val e | ORT Tes 2 = [5-0 LS 24 WH 1 АЙ, 8 PI-TN | 065 4 SE re [SE 571 1“ i Hs ss a ut = | lh pe ч 139 ces , Ed) В TE JE vol men | me TA HIT der IT igh Nr x || Luze L GE" al — ау Г” flac ЕН HE Dit + AN x AIH FET ; An : 1 ic Tira vel LE I A Te Зо 5 | 19 L 4 mL "a fis aa м : EL 69 ant Loz poz 1 Fe je Tan as +8 + = lr 1 а — Ye | Ч e = L Te La 90 zen TrE y TH ST] A Y e E e Er ElO | ний! = Mu J J oi | FIT seen corr | | aol vel Е I q HET | | 212 SRF + 510 BUT | E to AF cE ara вы ЧЕ IL Fe. i con DT I H [ re i 58} A Cle LHe км | ae В e = + = | | H a 4-35 FIGURE 4-34. BAND PASS FILTER / FIRST MIXER SCHEMÁTIC (81526) 1 art No. 74 aa rimmed In 4-18 RECEIVE SECOND IF BOARD (81527) This board provides the filtering for the trans- ceiver. It seiects between SSB/ CW, AM, transmitor receive. SSB/CW FLI and FL2 are 81532 Variable EW filters separated by amplifier Ql. Bandwidth is changed by varying the voltage at the base of Q2 with the front panel BW control (connector 72). In transmit, the filter is set to maximum bandwidth with the T voltage through diode D7, | AM Filter FL3 1581533 AM Filter. Either the SSB/CW filter or the AM filter is selected by diodes D3, Dd, D5, D6, D8, and D9 and the voltage at connector 73, TR The receive path or the transmit path 15 se- lected by Diodes DI, D2, Did, and D11{ and the T and E voltage present at connector 66. CAE FIGURE 4-35. RECEIVE SECOND IF BOARD COMPONENT LAYOUT (81527) Part Mo, 74215 November 19591 Printed In 0.5. A 22518] анУОВ 41 ONE XH FIGESON 1 БШ o MpIPHI £n EEE 110-7’ 00-0 ‘ dps FC AD ZN HE TE A PA Rasy E e CF FA a INEA Ea ENDE TS O [mare ] [935 EY] SH ¥HRIEZD or 243434] LL LE Le ut al wl = EL mL LO CIT +19 чо" = ко 53 Ca] me La | е55 | Ad a | м Ss Lr OFF wl 16 ZH WAT TIT e MIL 1 apL EM TE | a! 018 ces i ES о rt # TE = EIN | o | ZE x o rds CE | 1 27 I xe = ci TH Hal a = RE и т и ато Ania A a + a a A e ет J aly ot [oP Bi HH i nl NI XH] oH | N m quo =H | 140 1 =) ее + HI XE | Of a | {1 ; Na C4 | Le ét) но $ | чей pal | о | те ка zo | [5 | aus 4 4 р I ом 14 — | ша на — = Е iat — dh + LE НЕ LO a = = a | E Г | | H | el 4 7 | 4-37 FIGURE 4-36. RECEIVE SECOND IF BOARD SCHEMATIC (81527) BE Part Mo. 74212 November 1 Primtad In USA, 4-38 4-19 FIRST LO BOARD (81528) This board generates frequencies be- tween 45.1 MHz and 74,99909 MHz ¡n steps of 10 KHz for conversion of the incoming signals to the 45 MHz IF. The use of four oscillators, selected by the Microprocessor, reduce microphonics and phase noise, The signal is amplified and available for either receive or transmit circuits, Fachoscillatoris a colpitis design using a JFET, A positive voltage from the Logic Board selects the proper VCO (connector A) by turning on Q18, Q17, Q16 or Q15. The ouiput signal is buffered and am plified by (3, 06 and 07. After filtering, the signal is se- lected by diode D17 or D18 and the voltage at connector 53 for either the receive or transmit circuits. Q9 and 010 buffer and amplify the output signal before it jis applied to the prescaiet/PLL circuits. The PLL compares the divided signal with the reference and the phase outputs drive charge pump (Qil, Q12, Q13, and D14), The charge pump output pro- vides a voltage to the respective varactor (D1, D£, D3, or D4). Information from the micro- LPC ROC NF угле Ur ee CP rr PES = ы TL] Processor sets the correct division of the signal and reference (connector B). Connector C provides the same type of information for the 21d LO Board, Alignment Connect a voltmeter to the emitter of QI4 ar the test point TP, Using the frequencies in table !, adjustcoilsI1, L2, L3, and L4 forthe indicated value, For example, set the trans- ceiver for . 10000 MHz, adiustL1 fora voltage between 2.510 3.0 volts. Set the transceiver fo 7.49999 MHz and check for a voltage be- tween 7.5 and 8.0 volis, FREQUENCY | (TRANSCEIVER) VCO | VOLTAGE 10) MHz ] 2.5-3,0 _.. 749959 MHz | -1 7.5-5.0 —. 7530000 MHZ 2 2330 | | 1440590 MHz 2 13-80 |_14.50000 MHz 3 2.530 | _ 21.490900 MHz 3 7.5-8,0 |_ 21.350000 MHz 4 2.53.0 | 29.00990 MHz | 4 238,0 Part Ho, 74217 Novembar Tao Frinted fm USA fgzoie! devos 01 81 4-39 LE Cea En AD LIOZLIM и | Lrg и re ugg F EM F ¿A Ch a | = +155, 08 15" "5 ve ar 1 сц Эро ER BCH FELENT Ft Зы entr +5-ı5 Lure 2255 LECHL 51d Te AÑO Ter ez 11 4 ] ard po BEL 410040 SHE | Tes pera ЧН | ZA EI i DDL + Ti | BSH ‚о эта 2 LL тыла EST SMS NM TT ee - EMS uy kz (ня SLE A IRIS endl Tem 15) EARLY HAND he ri CL EE +1 1 T MON To] 2 {ле us 5 LE = Cg 2 + = + 11 11 1 > - ! a a 11 11 Jm | COCA CET | As Proc — Fea A + ET + (03m 1557 Sh 30434334) | es Eres org | 1 a DES del cn aliioía,+ Е) 24 | o E ra tb TH ; BI e TA : п y , , =" a E (373 CAT En T Ad 10a 5H HH Fi с ЮР | ВОВ 6 pocjue area sn = | MY eE d кПа = ms sms a 0+ flee ; x vf me = Ra va = mr ra Том wl af pa сна 5 res ruta —— + «19 AT + © ' = a MEL — os] LE | В La. a "CT 3% 233 qe | FIGURE 4-38. FIRST LO BOARD SCHEMATIC (81528) art Me. A212 Dvembar 1891 fnted in U.S.A, LTO 4-40 420) SECOND LO BOARD (81529) The 2nd LO tunes from 38.851 to 38,861 in 10 Hz steps and isused to convert the range of fregnencies in the first IF of 45 MHz to 6.144 MHZ, The board also contains the master reference oscillaior for all PLL unita (connectors 94 and 27), The mais VCO, Q1, operating from 73.9 to 74,9 MHz, is buffered by Q2 and Q3.. The output of Q2 is divided by 100 in-dividers Ul and U2. The resultant 739 to 749 KHz signal is filtered and applied to a mixer (D2, D3, D4, and D5) along with. the buffered output of the reference oscillator, The desired output, 10.644 MHz, passes through ceramic hiter FL1 andisamplified by QR, The9.9 Mhz reference is multiplied by 5 in Q6, filtered by tuned circuits and along with the amplified 10.644 MHz signal, applied to a mixer (D14, DIL, Di2, and D13). The mixer output is amplified in OQ and filtered by the tuned circuits. The output is either directed to the receive circuitry by diode D6 or the transmit e SS boosts a | Fl Ё РЕ Do re i] Ра SE YS “a C38 "Fr hb Гоа circuitry by diode D'7, The required voltages, to accomplish the T/R switching, arepresentat connector 68. The output of Q3 applies the VCO signal to the PLL U3. The output of the phase detector in U3 controls the VCO frequency by varying the voltage on D1. Alignment: Connecia VFVM to pin 2 of U3, Set frequency at 15.00500, go to 15.004599 and adjust coil L1 fora readingof 8.0 voits. Connect a spectrum analyzer to the test pinontheboard. AdjustL4, L10, L8, and L5 for maximum signal on 49.5 MHz. Output should beapproximately 10dBm. Connect the spectrum analyzer fo connector 98 and adjust 1.9, L6, and L.7 for maximum output, Output should be approximately 5 dBm, Reference: counter to connector7. Theoverall accuracy of the transceiver is controlied by this one crystal oscillator so the accuracy of the fre- queney counteris veryimportant, Adjust C38 for 9.900000 MHz. LS [5 LB FIGURE 4-39. SECOND LO BOARD COMPONENT LAYOUT (41529) Connect a frequency . Part Ne, 74212 Novembar 1841 Printed fm USA 524 LE dav O] Pue | | JELE LEN cn JECTAL zn | E2EED EN E 50M E LOT 14M 200-68 OLFF 5D'ID TISCH с G0'E0 } qg+vE sE | SERI-Z8D-dH FLOT10%99-20 10 FET ASE SO TIL Sa FRI + 5) EOS AN ZEN | XEM GO UTE | [5550 сем mun vharsI0 Sonya | “4 Es 4-41 5 med: + de ет en [kr | maf] THI Ea. E RES x T = q pea oa © DE SITE nL ES | | т и i I IT E 93 E IE FL + Fl Sen ajo El ; + : dk Ea , Li a Ter + MOL} z E Г, - Ást E He | e a . = = | Fe hy AE : : Sr iR - | 95 Tor * | A Da . 495" — es - | XY TT T= | EL" _ r | | H ] a | я - 1 3 a | J я FIGURE 4-40, SECOND LO BOARD SCHEMATIC (81529) Printed im USA, Mowambar 1987 Part No, TADTE 4-42 4-21 BFO BOARD (51530) The BFO S/A provides signals to be used with the product detector, the balanced modulator, and the FM transmission mode, These signals are ai] phase locked to the master reference 9,9 MHz oscillator, BFO/Carrier Oscillator - The VCO, QI, Operates at a frequency of approximately 119 MHz and is phase locked, insteps of 2 KHz, to the nastier reference of 9,0 the divided YCO signal are combined in a Mixer comprised of x4, D3, D6, and D7, The output 1s amplified by Q10, filtered and is available atconnector 35 ang 93 for the product detector and the balanced moduiator. The ont- put of Q3 iscombined with the output from the FM transmit oscilator(G7, Q8) and becomes the signal input for PILI, U3. The digital infor- mation that determines the frequency is ap- plied to U3 via connector 95. The outputof the LI 04 phase detector drives a charge pump ( 4, Q5, (6, and D3), loop filter and then the varactor Dz. _ Alignment: Connect a Y TYM to the Junction of the collectors of Q4 and OS. With PBT control centered , adjust LI for a readin E of4 volts. Connect the Y TYM fopin 5 of U3. Select FM mode and place the transceiver in transmit via MIC PTT. Adjusti2 for a reading 0f 2.5 volts. Return to receive and connect an RF voltmeter to connector 35, Peak 111 and L12 for maximum sj gnal. Theoutputshould be approximately -15 dBm. FM The FM transmit signal is generated by Q7. The output is combined with the BFO signal and forms the signal reference for PLL Ua, The outputofthe interna charge pump is used, | with its loop filter, to lock the oscillator on the transmit frequency determined by the digital information at connector 95, The microphane signal, developed in the TX Audio board, modulates the Ep transmitoscillator (Connec- tor 43) by varying the voltage on varactor D9. ar я Жи: RA: Da DL = L17 L12 A Part No, 7421 Movembar 1% Printed in UE, № Fes (OCC duvoS 048 fib FH Hh хо @ ED afc БЫ +il 5381 - Dz zu su 3 zz" Tope рок) T OLD} cz aa Lö” ; o . ar ma Cas F 2 H—t ma Être Le e 1d lr 11 Ju. wl 60| зак S67} | + IT TIE T we СЕН — : ; LLE LT 1 LAr 217 | {ds =]5|51= нуу Г т 3 | 4 bf EE SAD AN MS [HI SIEM GHG AT ONLINE "ES Sa A KA cad E | LT | ESS | -0 Я Y kr Ly OA Л MOSS H£ “Er AA PLONE re rh el EL LEA FE ENE J LOJGNE AO | ELLSEIM-LO SO QT LE ММО чб 0) БОЛИ -СО'НО STEEL “LE60SCH 640 Я+1М!-ЕО LOSE AO Oe IFHI-LO - FIGURE 4-42. EFO BOARD SCHEMATIC (81530) Fart No, 74212 4-43 481 7 Printed in U.S.A, MNovambear 4-44 4-22 CONTROL BOARD (81531) This board contains diode and transis- tor logic circuitry to develop control voltages based on inputs from the logic board, rear panel control jacks, or front panel switches, that determine the mode of operation (SSB, CW, | transmit, receive, ete.) of the various circuits in the transceiver. It also contains the CW wave shaping circuit that sets the rise and fall fimes of the transmitted CW envelope, and the hold-in adjustment for the auxiliary T/R switch. A request to transmit is sent by grcund- ing the YOX/PTT line, or grounding the KEY ling or from the [ Fimg_] button. The voltageat the colléctor of QS is used to either mute the audioamplifier, via connector 50, or sent to the logic board via connector 62 to let the micro- processor know that there hasbeen a request io transmit. When the logic board receives the transmit request, itchecks the frequency regis- ‘ters to determine if there should be a change before transmitting, such as would be required if in split etc, It then determines how much time is required to allow all frequencies to become stabilized and then sends an acknowledge signal back to the control board via connector. 62. The acknowledge signal keys transistor QB which then starts the transmit voltapes by enabling transistor Q20 through connector 55. - Connector 55 may be used to send and receive a Teady signal to and from a device such as a linear to prevent “hot switching” the linear, 023 level circuits in the transceiver. Transistors Q17 and 18 form an integrator that provides the keying wave form for CW and develops the required transmit (**T"”) and receive ( “R’”) voltagesto run the circuitsin the transceiver, T/R SWITCH An external transmit/receive switch via J-1, that may be used on both SSB or CW, can be connected to the T/R SWITCH via connector 60. This will enable transistor Q22 to senda signal to the mute pin on the audio amplifier, “and activate the linear switch Q23, The trans- ceiver may then be keyed for CW or the mic PTT used for 8B. - LINEAR DELAY When inthe CW made, transistor Q21 grounds capacitor C8 to provide a um-off delay to the LINEAR pin of connectar 60, The delay time may be set with poténtiometer R36, REGULATOR Transistors OL, Q2, Q3, and 04 provide a regulated voltage that is used on all the low Cables 52,67,30,65,6,54,63,50, and 15 distribute T; R, +REG, and +13,5 Volts to thecircuit boards. ‘Wires in these cables are color coded as fol- lows: T - biue, R - yellow, +REG - orange, +13.5-red: R36 FIGURE 4-43. CONTROL BOARD COMPONENT LAYOUT (81531) Part Mo. 74212 November 198° Printed In U.S: hiccia) axvoS T08LNOD Er ET ted TH Ol ORBE ERA 15d LOMA CHOGRZ th Heil THÉENE 20 Ln + L0OLO "tR0'GL0—5LD CO 0'B9—S0 TT "EC CERCO TAO ED 110—ZQ 1d ME EU GANO БМ ПМЕ E CHA) SqFt BY ZAIDA EE E + El m + I | ci 1 'd8 HAL FA Es ES |. SE 24% DL Ex | ЮО ГЕ FL hs E ra AL 4-45 > | I 171 SO AN SO | L ul A + FH || HT COLE SLT LEE | [dn 15] SHOIYHDESO 31425 1-7 —5 ¥ Ad AAA LIM] Doe & 5 3 CL ! wll LEE mE ely hal a Tr EN | 29 Ci [HOLM H/1 АА de pid e ja HDL KTH | i | {29) F IO ] + HL 9H MU | Cal _ MIL Ы 1 1 MO) E Gé Lara E FH & ст! 1| > = do В MIE mi | Fd AL | L OLE AH à | ro | a L № | | Jr ats : TLE 4 Tes) sh | ag *9EL Lo =a в а N y 3 Ly NE y ЖИ vq Y a: as TH jano Pena [o 26 yn CE | AH ua O |ASd "уч C4 ; | 15 ely ray æ e te | mont | el +L “тр = [_ Л ДН 11 [ «3 | tie ERE [8 55 [5 515 Ada & Es т Е 358785 TEE ath a Ra 1680 E ES r | Е a A ! 1 | a + о E | ol FIGURE 4-44. CONTROL BOARD SCHEMATIC (81531) Neovariber 1591 Printed in U.S.A, Part Mo. 74212 =. 4-46' 423 VARIABLE BANDWIDTH CRYS- TAL FILTER (81532) In CW and SSB modes, the receiver selectiv- ity is established by the Variable Bandwidth Crystal Filters located on the RX/2nd IF board 81527. Each variable bandwidth filter unit isa varactor tuned 4-pole ladder type filter, Two of these units are connected in cascade with an amplifier in between (Qi on the RX/2nd IE — board) to provide § poles of variable band- width selectivity. The receiver selectivity is continuously variable from 500 to 2500 Hz bandwidth [-6dB) with a constant 8-pole re- sponse; Refer to fi igure 4-11; Variable Band- width Filter schematic diagram. All the crystals and varactor diodes in the variable bandwidth filter arg identical. €1, C2, D1 and L] form a variable impedance matching network which transforms the natural impedance of the filter end section to 50 Ohms for all bandwidths. C3, C4, D5 and L2 perform the same function at - the other end of the filter. Varactor diodes D2, D3, and D4 form the shunt capacitors of the ladder network. Factory set potentiometers R] through RS select the proper portion of the bandwidth control voltage for each varactor diode and compensate for small parts toler ances and man utacturing variations. The set- tingsof R1 through RS arecritical to the proper operation of the variable bandwidth filter and should not be altered without the aid of an accurate network analyzer. As the Bandwidth Control voltage is varied by the front panel IF BW control, the filter parameters vary from 500 Hz bandwidth and 126 ohm natural imped- ance at 2 volts, to 2500 Hz bandwidth and 760 ohm natural impedance at 10 volts. The vari- able end matching networks ‘“track out** the impedance variation producing à continuously variable bandwidth and constant 50 Ohm ter- mination impedance. In transmit mode, D7 on the RX/2nd TF hoard pulls the Bandwidth Control line high to set the filter to 2500-Hz bandwidth regardless of the setting of the IF EW control, FIGURE 4-45, VARIABLE BANDWIDTH CRYSTAL FILTER COMPONENT LAYOUT (81532) | Fart Mo, 74212 November 1839 Printed Im US; | В (С [D Е 1 E а CAM TH — RI RA 100K + 100K ™ 2 100K cu СМ слу CW oo REG 3 7 TOD LONE RO 05 | , 190K — | — IM BUT O— I | —_ HE IN UT С! Ya | va. EL 310 | 3 0A | | 3 31| ey В. GHD © фе (1 GMD 4 NOTE: UNLESS OTHERWISE. SPA CIR REFERENCE MESIGNATORS LAST USED I JCAPACITANCE 1 PICCEARADS (pf) EE - ВЕ ZHNDUCTANCE 1 MICRO- HENSTS ДАН) C4 Rt0,05,L3,14 JIRESISTANCE iN (OHMS 15% 1/46 " Di-D4 SANTO SwCeiZ1sF 5 TI Yd4 5,144 MHz REV. B a sy 1832 5310-91 VAZIABLE BANDWICTE FILTER | 6153 Part Mo. 74212 Novambar 1821 Printed In UE A. FIGURE 4-46. VARIABLE BANDWIDTH CRYSTAL FILTER SCHEMATIC (81532) 4-47 4-24 AM CRYSTAL FILTER BOARD — (81533) In AM mode, the receiver selectivity is estab- lished by the AM Crystal Filter located on the RX/2ndIF board 81527, This filter 15sa5 KHz bandwidth, five-pole ladder type. Refer to figure 4-12; AM Crystal Filter schematic, C1- L1 and C8-1L.2 match the natural impedance of the ladder network end sections to 50 Ohms, Since the end section impedance of this filter is relatively high (about 1400 Ohms), the T1-C2 - and T2-C7 networks are used to cancel the 3pF holder capacitance of the end section xtals, This improves the symmetry of the filter re- FIGURE 4-47, AM FILTER sponse by increasing the attenuation slope in ROARD COMPONENT LAYOUT the lower stopband. (81533) A ‘ B = D Е — 1 2 4 NOTE: UNE: DENT Sere [REFERENCE DESIGNATORS LAST USED — NEABAEITANGE IN PICOEARADS (pf) a я ÉHNDUCTANCE IN AUCRO-HEMBYS (pH | CELA, 72,75 | DIRESISTANCE IN DNUS 15% 1/00 — 1 = — 5 6.144 MHz Ca ei e wince - 5" 30-91 AM. XTAL FILTER BO. |81533 FIGURE 4-48. AM FILTER. BOARD SCHEMATIC (81533). Part ‘Ha, 742%. Navember 189 Printed Ia LES, 4-48 | Part No. 74212 November 1881 Printad in USA, 4-25 NOISE BLANKER/FM BOARD (81544) This board contains the noise blanker and the receive portion of the FM mode. At - connector 75, à sample of thé 6,144 MHz receive signal from the 2nd mixer board 18 input to noise hlanker amplifiers U2 and U3. Part of the output of U2 is sent to the FM receive circuit. The output of U3 drives the AGC circuit (Q5, Q6) and the noise blanker pulse circuit (Q2, Q3, Q4). Inthe AGC circuit, O6 is a peak detector developing à DC voltage proportional to the signal and noise at its input, The AGC attack time is controlled by the time constant comprised of R21, R19, R20, and C185, This is set so the sharp noise pulses will : not activate the AGC, only a slowly varying signal such as SSB or CW will canse the AGC to reduce the gain in the noise blanker IF. This AGC achion helps to keep the noise pulse large compared to the signals and makes. it much easier for pulse peak detector Q? to develop a pulse for blanking. Capacitor C14 sets the pulse width. The noise blanker pulse is fed to the noise blanker gate, located on the 2nd mixer, by way of connector 77. The FM receive function is performed by Ul. Aporion of the6. 144 MHz signal from U? is applied to the input of Ul. The mixer portion of Ul converts the signal to 455 kHz where it is processed by the proper EM filter, CF1, amplified, limited and detected by a quadrature detector. Integrated circuit Ul also ‚ provides a squelch thatisactivated by a voltage applied to connector E. The FM mode is activated by the logic board and sends a volt- are to the FM board via connector Q. The voltage also is sent to the TX Audio board via connector D to be used in the transmit pre- emphasis. The recovered FM audio from connector 92 is sent to the IF audio board. Alienment: Cennect a variable noise source to the input of the receiver and an oscilloscope to the collector of the pulse gen- erator, Q4. Reduce the amplitude of the noise source until the pulse is about to disappear. : Tune L? and LI for maximum pulse width, reduce the amplitude of the noise source as required. ; Connect a signal generator to the input . of the receiver. Set the FM modulation on the generator to 5 KHz deviation, Make certain the receiver is set to the frequency of the generator and tune T2 for minimum distortion .. on the signal, R7 is used to set the squelch threshold. Terminate the antenna with a 50W load. Place unit in FM mode. Adjust R7 until receiver audia is no longer heard. rt E 8 Ao, ps Е Te ll; E Po RE о E. ue wf Л E Le нЕ N Se WA 1 1000 ha | = = RCE ooh Е | . FIGURE 4-49, EE SA NOISE BLANKER/FM BOARD BOARD COMPONENT LAYOUT (81544) 4-49 Patt Mo. 74: Navambar 1 Priqtad 1a U PESIS| MIINVIE ISION/NJ | Briel Ню. api ATE SAND A Ine A Cer AA A FOIE } pa = ih SEPM Al TAR | Г ar = ° tu a ] [ ur Tee - | = We | Tg [ura JET SHOLYNOE9O S0NEE=45b | e a HEHE EEMEEE 7 bes 4a =. 4 E o ME pe FIT ry — TT Ь | м Fr | ant TRE gi | i | 14 + MON ; * YET ¿ro 2 Ns | 11° || 239 (3) E № 3 : 5 5 h На ds reed ie Wk : 5 E o = : Ly . ; : к A ee д ели В лы Ai 5 = В 61$ 52-5] ЗЕ | 51 = (= e) ® H H EL oe E, d'a E A ; FIGURE 4-50, NOISE BLANKER/FM BOARD SCHEMATIC (81544) | 1 JE ee | lr 5 a dez | | ‘m ; ENT | "A In | +4170 El cel ho 8 IL a Ta e fix wo] © 0°} bd Py a AS У чз 19| ее | NT [#7 | Efe E ТЕМ rT de ES: a d | m} T = "Er Î | EL 7 ADE Po “EI È E Г TEN-TEC, Inc. CUSTOMER SERVICE TELEPHONE Highway 411 East 615-428-0364 Sevierville, TN 37862 LIMITED WARRANTY AND SERVICE POLICY, U.5.4, TEN-TEC, Inc. warrants this product to ha free from defects in material and workmanship for a period of one year from the date of purchase, under these conditions: 1. THIS WARRANTY APPLIES ONLY TO THE ORIGINAL OWNER. It is important that the warranty registration card be sent to us | promptly to establish you as the owner Df record, This will also | insure that any bulletins pertaining to this equipment will be sent, to you. ] 2. READ THE MANUAL THOROUGHLY. This warranty does not cover damage ‘ resulting from improper operation. Developing a thorough understanding of this equipment is your responsibility. | 2, IF TROUBLE DEVELOFS we recommend that you contact our customer service group direct. The selling dealer is not obligated by us to perform service in or out of warranty. It has been our experience that factory direct service is expeditious and usually results in lass down-time on the equipment. Some dealers de offer warranty service and of course, have our complete support. 4. WE ENCOURAGE SELF HELP. Taking the covers off does not void the © warranty. In many cases our customer service technicians, with your help, can identify a faulty circuit board, In these cases we will =; send you a replacement board which you can change out. This will ke! shipped on a 30 day mémo billing and when the defective board is returned, we will issue credit. 5, EQUIPMENT RETURNED TO THE FACTORY must be properly packaged, preferably in the. original shipping carton. You pay the freight to ue and we prepay surface freight back to you. 6. EXCLUSIONS. This warranty does not cover damage resulting from misuse, lightning, excess voltages, polarity errors or damage resulting from modifications not recommended or approved by Ten- Tac, In the event of transportation damage a claim must be filed with the carrier. Under no ciroumstances ig Ten-Tec liable for consequential damages to persons or property caused by the use of this equipment. 7. TEN-TEC RESERVES the right to make design changes without any obligation to modify equipment previously manufactured. a. THIS WARRANTY is given in lieu of any other warranty, expressed or implied. SERVICE OUTSIDE OF THE U.5.A. Many of our dealers provide warranty service on the equipment they sell, Many of them also provide out of warranty service on all equipment whether they sold it or not. If your dealer does not provide service or is not conveniently located, follow the | procedure outlined above. Equipment returned to us will be given the same attention as domestic customers but all freight expense, customs and broker fees will be paid by you. ">

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Key features
- HF transceiver
- 5W or 100W output
- SSB, CW, FM operation
- Built-in speech processor
- Dual VFOs
- 48 memory channels
- Front panel keypad
- Rear panel connections
- VOX and PTT operation
- Variable receive offset tuning
Frequently asked questions
The maximum output power of the Ten-Tec Argonaut II 535 is 5 watts.
The maximum output power of the Ten-Tec Delta II 536 is 100 watts.
The Ten-Tec Argonaut II 535 and Ten-Tec Delta II 536 support SSB, CW, and FM operating modes
Yes, the Ten-Tec Argonaut II 535 and Ten-Tec Delta II 536 have a built-in speech processor.
The Ten-Tec Argonaut II 535 and Ten-Tec Delta II 536 have 48 memory channels