Swann 350 Operation And Maintenance
Below you will find brief information for Transceiver 350 SERIES 350. This manual details the operation, maintenance, and specifications of the Swan Model 350 single sideband transceiver. It covers topics such as circuit theory, installation, operation, alignment, and troubleshooting. The transceiver supports single sideband, suppressed carrier operation and includes features like adjustable microphone gain, carrier balance, and power output adjustments.
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Price $1.50 OPERATION AND MAINTENANCE [Ey ERS IL TL IEEE AR Sak 23 JR ALLE d SWAN MODEL 350 SWAN ELECTRONICS CORP. Oceanside, California OPERATION and MAINTENANCE MODEL 350 SERIES Single Sideband Transceiver Го нач Ap pe Moria Dr te MEE Rs DE SRE A RE ENTHRODUETTOK The fan Modo) 450 Siege Skdeband Trarecehyer Eopather weh it acocisorba and oplional oquípmen: ke dustgned 10 b= uss Sn qrber (Pr co 388 made an all poróme of the Si, M1. 30, E. ame 19 mer amar Cedo Odds MANS froguencias mi albo He covered hy emp thie Shadi] 206 ellos BE Tr bee 9 get ae 8 nit sich br. Gin] by me a or Dr ce Or, ond The a ие DH уа п horca hire de imps bor Бо tha recived Fruity. Frovidors mr encoder Le Cu Face for opecailon on fhe roost weed skdchand For ach ap songe and proviskom (GF ower didicared coverngn la wvulléble dé a5 орт! К! Basle cleeuiiry of ly подло cha king der has been prrvan In ameral feurand oí bic Popular Baras iranicalvera. Meahanonl, clortrical, end thee- mal Abi la escrptienalh: high. All oscillator are jempereturo comperániod amd olbege gulated. Pueblo -halk Graham. WH sandard, with prov son hr euge In the Model VE] acorsery YOR unk dar na оп ыы: ru ét comme! The hath: rranspeser passen cnvaráage Cf al por tana of Ehe Bak through LOmaic” amaror banda do nddicicm во ke, he amplimec recon willl boo 16 Ta MAD Frogumnciss cour the Bil, 441, axed 21k mar bum: Hy Jar ihe Rodel 405% emciialur Deer. NAH opreaton La thus possible With = «orable powcr supply, Operation may be Axed, pomahie or mete, Fw lope on all hand Ecosse 400 wat, PER, vn segle в балы, A300 waks om OW, a= 125 wes on AM The bei bir (nude Au male gain oor [AC maomallc love control, [ATA and grid back 45 eri. Far E of dk instucios mapas] eovers the baali а песме. Part ID covers the regomenemdad pra supplied, Mela LITA dar ne opstélhii, and МГ гай - od 14117 for Jet de Speman Farl Ll poe vides ¡ormadirn un vernos uo ri. = 5A O swan во Ее Тя НЫ Te racer Cora: CONTENTS: CIRCUIT THEORY INSTALLATION OPERATION ALIGNMENT AND TROUBLE SHOOTING SC ow» FREQUENCY RANGES 80 Meters 3.5 to 4.0 mc LSB 40 Meters 7.0 to 7.5 mc LSB 20 Meters 13.85 to 14.350 mc USB 15 Meters 21.0 to 21.5 mc USB 10 Meters 28.0 to 29.7 mc USB (Note: Opposite sideband selection available with accessory Kit.) POWER INPUT Single Sideband, Suppressed Carrier: 400 watts, PEP, minimum on all bands. CW: 320 watts, dc input on all bands. AM (Single Sideband with Carrier): 125 watts dc input on all bands. DISTORTION Distortion products down approx. 30 db. UNWANTED SIDEBAND SUPPRESSION Unwanted sideband down more than 40 db. CARRIER SUPPRESSION Carrier suppression greater than 50 db. RECEIVER SENSITIVITY Less than 0.5 microvolt at 50 ohms impedance for signal-plus-noise to noise ratio of 10 db. AUDIO OUTPUT AND RESPONSE Audio output, 4 watts to 3.2 ohm load. Res- ponse essentially flat from 300 to 3000 cps in both receive and transmit. TRANSMITTER OUTPUT Wide-range Pi-network output matches antennas essentially resistive from 15 to 500 ohms imped- ance, with coarse and fine load adjustment. METERING Power amplifier cathode current 0-800 ma on transmit, S-Meter 0-70 db over S9 on receive. FRONT PANEL CONTROLS Rec-Tune-CW, AF Gain, Mic. Gain, Bandswitch, Carrier Balance, PA Plate Tune, PA Grid Tune, SPECIFICATIONS: PARTS LIST SCHEMATIC POWER SUPPLIES ACCESSORIES но зы PA Load Coarse, PA Load Fine, VOX-PTT Switch, Dial Set, RF Gain. REAR PANEL CONTROLS AND CONNECTORS Bias potentiometer, CW key jack, Jones plug power connector, Vox connector, Antenna jack, S-Meter zero, Auxiliary relay switchings. VACUUM TUBE COMPLEMENT NA! 6EW6 VFO Amplifier V2 12BE6 Transmitter Mixer V3 6GK6 Driver V4 6HF5 Power Amplifier V5 6HF5 Power Amplifier V6 12BZ6 Receiver RF Amplifier V7 12BE6 Receiver Mixer V8 6EWS6 First IF Amplifier va 12BA6 Second IF Amplifier V10 12AX7 Product Detector/ Receive Audio V11 €6BN8 AGC Amplifier/ Rectifier V12 6GK6 Audio Amplifier V13 7360 Balanced Modulator V14 12BA6 Carrier Oscillator V15 12AX7 Mic. Amplifier/ Transmit Audio V16 O0A2 Voltage Regulator DIODE AND TRANSISTOR COMPLEMENT Ql 2N706 Oscillator Q2 2N706 Emitter Follower D401 TS-2 ALC diode D402 TS-2 ALC diode D601 TS-2 S-Meter delay diode D1601 1N2974A Zener voltage regulator D1602 TS-2 Relay Silencing Diode POWER REQUIREMENTS Filaments 12.6 volts, 5.5 amps, ac or dc Relay 12 volts de, 250 ma. Bias -110 volts de, 100 ma. Medium voltage 275 volts de, 150 ma. High voltage 800 volts de, 500 ma. Peak Trans. DIMENSIONS AND WEIGHT Height 5-1/2 in. Depth 11 in. Width 13 in. Weight 17-1/4 1b. MODEL 350 TRANSCEIVER A. CIRCUIT THEORY GENERAL DISCUSSION The Swan 350 transceiver provides single sideband, suppressed carrier transceive operation, and gener- ates the single sideband signal by means of a crystal lattice filter. To permit a logical discussion of this mode of operation, certain definitions are necessary. In a normal AM signal, (double sideband with car- rier), a radio frequency signal is modulated with an audio frequency signal. This is considered by many to be merely a case of varying the amplitude of the carrier at an audio rate. In fact, however, there are actually sideband frequencies generated, which are the results of mixing the RF and the AF signals. These sidebands are the sum of, and the difference between the two heterodyned signals. In the detection of this conventional AM signal, the two sidebands are mixed with the carrier to recover and reproduce the audio intelligence. This is an inef- ficient means of transmission, because only 25 per- cent of the transmitted power is used to transmit intelligence. There are other attendant drawbacks, also. The bandwidth of AM voice transmission is approximately 6 kc, while the actual demodulated audio is only approximately 3 kc. The result is inefficient use of the frequency band, and over half of the alloted band is unusable due to heterodynes, interference, and congestion. In the single sideband, suppressed carrier mode of transmission, only one of the sideband signals is transmitted. The other sideband and the carrier are suppressed to negligible level. In addition to increasing the transmission efficiency by a factor of four, single sideband effectively doubles the number of stations or channels which can be used in a given band of frequencies. It should be remembered that in the single sideband, suppressed carrier mode of transmitting, the un- wanted sideband and carrier are only suppressed, not entirely eliminated. Thus, with a transmitted signal from a transmitter with 40 db sideband sup- pression, the other or unwanted sideband will be present, and will be transmitted, but its level will be 40 db below the wanted sideband. When this signal is received at a level of 20 db over S9, the unwanted sideband will be present at a level of approximately S5. The same is true of carrier suppression. With carrier suppression of 50 db, and a signal level of 20 db over S9, carrier will be present at a level of approximately S3 to $4. In the Model 350 transceiver, the single sideband suppressed carrier signal is generated by the crystal lattice filter method. For details, refer to the sche- matic diagram, and to Figures 1, 2, and 3. SIGNAL GENERATION When the push-to-talk switch on the microphone is pressed, the transmitter portion of the transceiver is activated, and it generates a single sideband, sup- pressed carrier signal in the following manner. Carrier is generated by V14 Carrier Oscillator, which is a Pierce oscillator with the crystal operating in parallel resonance. This stage operates in both the transmit and receive modes. When transmitting, the RF output of the oscillator is injected into the control grid of the Balanced Modulator, V13. This balanced modulator is a bearh deflection tube, and operates similar to a cathode ray tube in that the electron beam from the cathode is deflected to one output plate or the other by the charge appearing on the deflection plates. The carrier signal fed to the control grid of the balanced modulator appears on both plates of the output. The two plates are connected to Transformer Z1301 in push-pull, so the carrier signal cancels itself out in Z1301. The deflection plate DC voltages are adjusted by means of the carrier balance control so that the RF being fed to the output plates will cancel out, and the output from Z1301 will be zero. Audio signals from the Microphone Amplifier, V15, are applied as a modulating voltage to one deflection plate, and the two sidebands resulting from the sum and dif- ference frequencies of the audio and carrier signals appear in the output of transformer Z1301. Carrier suppression is approximately 50 db. The double sideband, suppressed carrier signal is then coupled from the secondary winding of 71301 to the crystal filter, which suppresses the lower side- band, and permits only the upper sideband to be fed to the First IF Amplifier, V8. The carrier fre; quency is generated at approximately 5172.8 kc-. With the optional other sideband crystal, the carrier crystal frequency will be 5176.3 kc, and this posi- tions the double sideband signal on the other side of the filter response curve, attenuating the upper sideband by at least 40 db. In the single conversion mixing process, these sidebands become inverted on 80 and 40 meters. Thus the Swan-350 normally operates on lower sideband on 80 and 40, while on 20, 15, and 10 meters normal operation is on upper sideband. Ql, the VFO 2N706 Oscillator, operates in the common base configuration as a Colpitts oscillator. Q2, the Emitter Follower is used for isolation and impedance matching purposes. The extremely good regulation achieved through using the Zener diode regulator D1601 across the bias supply voltage, also contributes to the stability. Bandswitching is accomplished by changing the tank circuit coil The VFO in the Model 350 exhibits extremely good stability after the initial warm-up period. Drift from a cold start will be approximately 1 kc for the first hour on 80-, 40-, and 20-meter bands, and 2 kc on 10 and 15 meters. After the initial warm-up period, drift will be negligible. The single sideband, suppressed carrier signal from the First IF Amplifier is fed to the Transmitter 3 I MODEL 350 TRANSCEIVER A. Circuit Theory (Cont) < [та 777777 I | I \ 1 TTT TTA } | \ H viz У10А AUDIO PRODUC 2nd IF, OUTPUT DET. AMP. vu vloB Via vs Ql -Q2 PI У AGC -DETjgg—{ RCVR. CAR. Ist 1.F. VFO NET AMP, AF. OSC. AMP, V1-AMP, AMP, A 177774 m---- 1! mm | | ' CRYSTAL у? v6 | | | | | FILTER RCVR, haf—1 RCVR. i | t | | t MIXER R.F. Risa a Lec! AMP. TT E = ET | | v2 v3 V4-V5 } 1 1 ! t ' | i MIXER DRIVER AMP, o e AL \ CL LIL Y |! o] , Vid v8 Q1-02 = | ! | CAR, 1st LF. VFO NET | | ‘ OSC, AMP, VI- AMP, + Eo oo VIB VISA vis 1 [ US Pe MIC. AF, BAL, CRYSTAÏ ID AMP, > AMP, 3-1 mop. [FILTER FIGURE 2 BLOCK DIAGRAM, TRANSMIT MODE 0 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 Kilocycles 6 DB 27004, A 20 | | 40 ! | | | | 60 4400 ^. | | | 80 ! ! | ! | 100 | A 5172.8 ke Carrier Freq, Nr FIGURE 3 CRYSTAL FILTER, TYPICAL CHARACTERISTIC I MODEL 350 TRANSCEIVER A. Circuit Theory (Cont) SIGNAL GENERATION (cont) Mixer, V2, where it is heterodyned with the VFO signal. The resultant signal at the desired transmit frequency is amplified by the Driver, V3, and the Power Amplifiers, V4 and V5. The signal from the VFO Amplifier is initiated in the transistorized VFO- Emitter Follower circuit @1, Q2. The signal from the VFO is routed to the VFO Amplifier, and on 40 and 80 meters, is subtractively mixed with the single sideband signal from the IF Amplifier to result in LSB operation. On 20, 15, and 10 meters, the frequencies are additively mixed, resulting in output on the upper sideband. When in TRANSMIT, the gain of the First IF Amplifier is controlled through the Automatic Level Control network D401-D402, etc., to control the gain of the stage in response to the average input power to the Power Amplifiers. This ALC system will compensate for any extremely strong input signals, but does not completely eliminate the necess- ity of proper adjustment of the Mic. Gain Control. This feature will help prevent the transmitter from flat-topping and spurious emissions, but consider- able distortion may occur if the Mic. Gain Control is not properly adjusted. Refer to Operating In- structions. TUNE AND CW OPERATION Normally, the frequency of the carrier oscillator is approximately 300 cps outside the 6 db passband of the crystal lattice filter, In TUNE position, to enable the transmitter to be tuned to the maximum power output condition, the frequency of the carrier oscil- lator is moved approximately 500 cps to place it well within the passband of the crystal lattice filter. At the same time, one deflection plate of the balanced modulator is grounded, unbalancing the modulator and allowing full carrier input for tuning purposes. A similar procedure is followed for CW to allow full carrier output during CW operation. During CW operation, the cathode of V15A is disconnected from ground. This allows CW operation with no accidental audio modulation from the microphone. RECEIVE In RECEIVE position, or at any time when the transmitter is notin TRANSMIT, all circuits used in transmitting are disabled through the relay con- trolled circuits, K1, K2. The relays are energized for transmitting and de-energized for receiving. Relay K2, when de-energized, allows signals from the transmitting tank circuit and antenna to be fed to the Receiver RF Amplifier, V6, where they are amplified and then fed to the control grid of the Receiver Mixer, V7. The local oscillator signal from the VFO Amplifier is now used to heterodyne the received signal to the IF frequency. All IF amplifi- cation is accomplished at this frequency, nominally as ke, through V8 and V9 IF amplifiers. In the Product Detector V10A, the IF signal is hetero- dyned with the carrier frequency generated by Car- rier Oscillator, V14. The resultant audio signal is then amplified by V10B, which then couples to V11, the AGC amplifier,and V12, the output audio stage. FREQUENCY CALIBRATION Frequency calibration of the Model 350 is in 5 kc increments on 80-, 40-, 20-, and 15-meters, and in 20 kc increments on 10M. 80- and 20-meters are calibrated directly on the upper dial scale. 40-and 15-meters are calibrated from zero to 500 on the green tinted center scale, and 10-meters is calibrated directly on the lower dial scale. The two red indicator lines on the dial window re- present the passband of the transceiver, and the actual carrier frequency depends on which sideband is in use. For upper sideband, carrier frequency is read with the left hand indicator line. For lower sideband, use the right hand line. Dial accuracy and tracking are very good on the 350, but caution must always be observed when operating near band edges. Some means for meas- uring frequency is recommended. The optional calibrator kit will serve this purpose, and installs quite easily inside the transceiver. - TRANSMIT AND RECEIVE SWITCHING Transmit and réceive switching is performed by relays K1 and K2. In TRANSMIT position, only those tubes that operate in the transmit mode are operative, all others being biased to cutoff through the relay contacts. In the RECEIVE position, with the relays de-energized, the tubes that arc used only in transmit are cut off in the same manner. Relay K2 when de-energized, feeds signals from the output pi-network to the receiver, and is used also to con- trol external switching circuits. In transmit position the meter indicates the combined cathode current of the two power amplifiers. In receive position, it indicates the voltage across R902 in the cathode of the Second IF Amplifier, V9, which is inversely proportional to the AGC voltage used to control the gain of the tube. Thus, the meter indicates the relative strength of received signals. POWER RATING The Swan 350 is capable of 400 watts, PEP input under steady state two-tone test conditions, when operated with any of the recommended power sup- plies. The peak envelope power, when voice modu- lated, is considerably greater, typically 500 watts, or more. Recommended power supplies produce a no-load plate voltage of approximately 925 volts. Under TUNE conditions, or CW operation, this voltage will drop to approximately 720 volts. Under steady state two-tone modulation, the voltage will drop to approximately 750 volts. If the power amplifier idling current is 50 ma, and the two-tone current, 5 I MODEL 350 TRANSCEIVER A. Circuit Theory (Cont) just before flat-topping, is 375 ma, the peak two- tone current will be 560 ma. Under these conditions the PEP input will be 750 volts times 560 ma, = 420 watts. Under voice modulation, because aver- age power is considerably less, the power amplifier plate and screen voltages will be maintained higher, even during voice peaks, by the power supply filter capacitors. Peak plate current will therefore also be higher than with two-tone test conditions. Under typical operating conditions, peak plate current be- fore flat-topping will be 625 ma at 800- volts, to result in an input of 500 watts, PEP. Readings of cathode current will not reflect this 500 watt power input, however, because of the damping in the cathode current meter. Cathode current readings under normal voice input should not exceed approx- imately 150 to 175 ma. POWER AMPLIFIER PLATE DISSIPATION There is often a misunderstanding about the plate dissipation of tubes operated as AB1 amplifiers under voice modulation. In the Swan 350, while in the transmit position, and with no modulation, the plate voltage will be 890 volts, the plate current 50 ma, and the power input will be 45 watts. Authorities agree that the average voice power is 10 to 20 db below peak voice power. Normally some peak clipping in the power amplifier can betolerated, and a peak-to-average ratio of only 6 db may some- times occur. Under such conditions, the average power input will be 125 watts, and average plate current will be 156 ma. With power amplifier efficiency of 65 percent, plate dissipation will be 44 watts, or 22 watts per tube. The 6HF5 is rated at 28 watts, continuous duty cycle, in normal TV service. Thus it can be seen that under normal operating conditions, the power amplifier tubes in the Swan 350 are not being driven very hard. Note, however, that proper modulation level must be maintained by correct setting of Mic. Gain, and that the length of time in TUNE position must be limited to not more than 30 sec. at a time. | в. INSTALLATION | GENERAL The Swan 350 transceiver has been designed to provide the utmost in ease of operation, stability, versatility, and enjoyment. Maximum enjoyment from your Swan will depend to a great extent on the installation. For fixed station or portable use, operation with the Model 117-XC power supply provides a compact arrangement with maximum ease of operation. All switching is performed in the transceiver. For mobile installations, the Model 14-117 supply provides similar switching arrange- ments, and speaker output may be fed through the car broadcast receiver speaker. 6 POWER SUPPLY The Swan Models 117-XC or 230-XC Power Sup- plies provide all necessary voltages required by the transceiver for AC operation. The supplies come equipped with a pre-wired plug and cable, all ready for plugging into the transceiver. The Model 14-1 17 supply for mobile operation includes all necessary cables, connector plug, fuses, and installation hard- ware. The Jones plug for connection to the trans- ceiver is furnished with the unit. Power requirements for the Swan 350 are listed in the following table. Pin connections to the Jones type power connector are listed as an aid in con- necting other brands or home-brew supplies. EXTERNAL SPEAKER CONNECTIONS Audio output from the transceiver is provided at pin 12 of the Jones plug. The other speaker lead goes to the common chassis ground atpin 6. Out- put impedance is between 3 and 4 ohms. For mobile installations, the car broadcast speaker may be used, in which case a DPDT selector switch should be installed to select either the broadcast receiver or transceiver output. (See Figure 9). JONES PLUG CONNECTIONS Pin | Nominal | Minimum ¿Maximum High g | 800 VDC | 600 VDC |1200 VDC Voltage 500 MA | Low Pwr. | Hi. Power Medium 275 VDC Voltage 10 150 MA 225 VDC | 325 VDC Bias -110 VDC 3 - - Voltage 100 MA 100 VDC |-130 VDC Filament 12.6 V* Voltage 4 5.5 amp 11.5 V 14.5 V Relay 12 VDC Voltage 5 250 MA 10 VDC 114.5 VDC *AC or DC MICROPHONE The microphone input is designed for high imped- ance microphones only. The choice of microphone is important for good speech quality, and should be given serious consideration. The crystal lattice filter in the transceiver provides all the restriction necessary on audio response, and further restriction in the microphone is not required. It is more im- portant to have a microphone with a smooth, flat response throughout the speech range. The micro- phone plug must be a standard 1/4 in. diameter three-contact type. The tip connection is for push- to-talk relay control, the ring connector is the micro- phone terminal, and the sleeve is the common chassis ground. The microphone manufacturer's I MODEL 350 TRANSCEIVER B. Installation (Cont) . instructions should be followed in connecting the microphone cable to the plug. With many micro- phones, the push-to-talk button must be pressed to make the microphone operative. For VOX oper- ation, this feature may be disabled, if desired, by opening the microphone case and permanently con- necting the contacts which control the microphone. ANTENNA ° Any of the common antenna systems designed for use on the high frequency amateur bands may be used with the Swan transceiver, provided the input impedance of the transmission line is not outside the capability of the pi-output matching network. The transmission line should be of the coaxial cable type. An antenna system which shows a standing wave ratio of less than 4:1 when using 50 or 75 ohm coaxial transmission line, or a system that results in a transmission line input impedance that is essentially resistive, and between 15 and 500 ohms will take power from the transceiver with little difficulty. If open-wire or balanced type trans- mission line is used with the antenna, a suitable antenna tuner is recommended between the trans- receiver and the feedline. Methods of constructing and operating such tuners are described in detail in the ARRL Antenna Handbook, and similar pub- lications. For operation on the 75- and 40- meter bands, a simple dipole antenna, cut to resonate in the most used portion of the band, will perform satisfactorily. For operation on the 10, 15, and 20 meter bands, the efficiency of the station will be -. greatly increased if a good directional rotary anten- na is used. Remember that even the most powerful transmitter is useless without a proper and efficient antenna system. “ MOBILE ANTENNA Mobile antenna installations are critical, since any mobile antenna for use on the high frequency bands represents a number of compromises. Many ama- — teurs lose the efficiency of their antenna through improper tuning. Points to remember about the mobile antenna used with the Swan 350 are: 1. The "Q" of the antenna loading coil should be as high as possible. There are several commercial models available which use high "Q" coils, including the Swan Model 45 and Model 55 5 band " Swantennas”. 2. The loading coil must be capable of handling the power of the Model 350 without over heating. In TUNE position, the power output of the transceiver may exceed 250 watts. Wide spaced, heavy wire loading coils are essential. 3. The SWR bridge is a useful instrument, but unfortunately it is quite often misunderstood, and over rated in importance. Basically, the SWR bridge will indicate how closely the antenna load impedance matches the trans- mission line. With long transmission lines, such as will be used in many fixed station installations, it is desirable to keep the impe- dance match fairly close in order to limit power loss. This is particularly true at the higher frequencies. The longer the line, and the higher the frequency, the more important SWR becomes. However, in mobile installations the transmission line seldom exceeds 20 feet in length, and an SWR of even 4 to 1 adds very little to power loss. The only time SWR will indicate a low figure is when the antenna presents a load close to 50 ohms, but many mobile antennas will have a base impedance as low as 15 or 20 ohms at their resonant frequency. In such a case, SWR will indicate 3 or 4to 1, and yet thesystem will be radiating efficiently. . The really important factor in your mobile antenna is that it should be carefully tuned to resonance at the desired frequency. The fallacy in using an SWR bridge lies in the fact that it is sometimes possible to reduce the SWR reading by detuning the antenna. Field strength may actually be reduced in an effort to bring SWR down. Since field strength is the primary goal, we recommend a Field Strength Meter for antenna tuning. . For antenna adjustments, the Swan-350 may be loaded lightly to about 100 ma, cathode current instead of the usual 500 ma. This will limit tube dissipation during adjustments, and will also help reduce interference on the frequency. In any case, do not leave the transmitter on for very long at one time. Turn it on just long enough to tune and load, and get a field strength reading. Start out with the antenna whip at about the center of its adjustment range. Set the VFO to the desired operating frequency and then adjust P. A. TUNE for dip, and P. A. LOAD for 100 ma. Then observe the field strength reading. The Field Strength Meter may be set on top of the dash, on the hood, or at an elevated location some distance from the car. Change the whip length a half inch, or so, at a time, retune the P.A. for 100 ma. loading each time, and check field strength. Con- tinue this procedure until the point of maxi- mum field strength is found. This adjustment will be most critical on 75 meters, somewhat less critical on 40, etc., until on 10 meters the adjustment will be quite broad. After tuning the antenna to resonance, load the P. A. to full power. CONTROL FUNCTIONS ON-OFF SWITCH AF GAIN (On AF Gain Turns power supply on and Knob) off. REC-TUNE-CW Receive All voltages are applied to MAIN TUNING transceiver. Transmit 12 volt de circuit through re- (Push-to-Talk) lay K1 and K2 is completed, PA GRID and tubes used only in receive are biased to cutoff. Tune-CW All circuits for transmit are PA TUNE energized, as above, but one deflection plate of the balanced modulator is grounded, capac- itor C1401 in the carrier os- cillator is removed from gro- und. MIC. GAIN Controls potentiometer R1503 in the grid of V15A and con- PA LOAD, Coarse trols amount of audio to the balanced modulator. CAR. BALANCE Controls potentiometer R1305 in the bal d dul d MAIN in the alance mo ulator de- BANDSWITCH flection plate circuit, and per- mits nulling out the carrier. PA LOAD, Fine RF GAIN Controls variable resistor R609, common in the cathodes of RF Amplifier, V8 and V9 IF Amplifiers. Controls potentiometer R1201 in grid circuit of V12 AF Out- put, and controls audio vol- ume. Controls C1706 in frequency determining tank circuit of VFO. Controls CIA and CIB in plate tanks of transmitter mixer and driver. Controls C417 on pi-network to tune final power amplifier plate to resonance. Controls C420 in pi-network to match impedance of output load. Tunes input to Receiver RF Amplifier. Switches in progressively more capacitance in parallel with PA Load, Fine. Switches, plate coils, and asso- ciated capacitors of VFO, VFO Amplifier, V1, Transmitter Mixer, V2, and Driver, V3. Also switches tank coil of pi- coupling system and assoc- lated capacitors in PA output tank. MODEL 350 TRANSCEIVER age source. C. OPERATION 3. Connect the power supply to the proper volt- Before connecting any cables to the Swan 350 The Swan Model 350 may be operated from 117 perform the following steps: volts, ac, 50 - 60 cycle power with the Model 117- 1. Rotate the PA BIAS control on the rear chas- XC power supply, or from 230 volts, 50 - 60 cycles sis apron, fully counter clockwise. with the Model 230-XC. The Model 350 may be 2. Rotate the REC-TUNE-CW located on the operated from a 12 volt dc source with the Swan lower left of the front panel counter clockwise Model 14-117 power supply. to REC. 3. Rotate the AF GAIN Control counter clock- wise to operate the power switch to OFF. WARNING POWER SUPPLY AND ANTENNA CONNECTIONS DANGEROUS HIGH VOLTAGE IS PRESENT the coaxial connector on the rear chassis WHENEVER THE POWER SUPPLY IS ENER- panel. GIZED. NEVER TURN POWER ON WHEN 2. Connect the power supply cable to the Jones THE POWER AMPLIFIER COVER IS REMOV- connector on the rear chassis apron. ED. HIGH VOLTAGE IS ALSO PRESENT AT PIN EIGHT OF THE POWER PLUG. RECEIVE OPERATION 1. Rotate the AF GAIN Control clockwise to about the 3 o'clock position. The power switch will operate applying filament, relay, bias, medium, and 800 volt high voltage to the transceiver. 2. Wait approximately one minute to allow the tube filaments to reach operating temperature. During this period, perform the following steps: (a) Rotate the BANDSWITCH to desired band. (b) Rotate MIC. GAIN fully counter-clock- wise. (с) Rotate CAR. BAL. control to the mid- scale position, with white dot on knob aligned with the long index mark on the panel. (d) Preset PA PLATE control to mid-position. (e) Preset PA GRID control to mid-position. (f) Preset PA LOAD FINE to mid-position. (g) Preset PA LOAD COARSE to position 1. (h) Set tuning dial to desired operating freq- uency. (1) Set RF GAIN control to approximately 3 o'clock position. 3. Carefully adjust the PA GRID and the PA PLATE controls for maximum receiver noise. Note: The PA GRID control resonates the transmitter driver stages and the receiver RF amplifier plate circuit. The PA PLATE and PA LOAD controls adjust the input and output capacitors in the transmitter power amplifier final plate circuit, as well as the receiver RF amplifier grid circuit. Proper adjustment of these controls in the receiver position will result in approximately resonant conditions in the transmitter stages. RECEIVER TUNING — IMPORTANT, READ CAREFULLY. Precise tuning of a single sideband signal is very important. Do not be satisfied to merely tune until the voice can be understood, but take the extra care of setting the dial to the exact spot where the voice sounds natural. Above all, avoid the habit of tuning so that the voice is pitched higher than normal. This is an unfortunate habit practiced by quite a number of operators. The following points help to explain the effects of mistuning: 1. If you tune so the received voice is higher than normal pitch, you will then transmit off frequency, and your voice will sound lower than normal pitch to the other station. He will probably retune his dial to make you sound right. If you keep this up, you'll grad- ually waltz one another across the band. If both of you are mistuning to an unnatural higher pitch, you'll waltz across the band twice as fast. (And someone will no doubt be accused of frequency drift). 2. Mistuning results in serious harmonic dis- tortion on the voice, and should be quite noticeable totheaverageear. Some will claim that if they don't know how the other person's voice actually sounds, they can't tune him in properly, but this is not true. With a little practice, it will be fairly easy to tell. Some voices are relatively rich in harmonics, and are easier to tune in than a person with a "flat" voice. Also, a transmitter which is be- ing operated properly with low distortion will be easier to tune in than one which is being over-driven and is generating excessive distortion. There is no mistaking when you have a station tuned right on the nose. It will sound just like "AM", so to speak. Main- ly, avoid the habit of tuning so everyone sounds higher than normal pitch, or like Donald Duck. This is incorrect, unnecessary, and sounds terrible. 3. A vernier control for receive frequency, some- times referred to as "incremental tuning”, is not available on the Swan-350. Such a device is not necessary if proper tuning habits are exercised. 4, Your Swan-350 will automatically transmit on exactly the same frequency as the one to which you are listening. There is no adjust- ment for making them the same, since by using the same oscillator for both send and receive, it happens automatically. If separa- tion of receive and transmit frequency control is desired, the model 406B or 410 VFO unit may be used. The model 22 dual VFO adapt- or must be installed in the 350 in order to accomodate the 406B or 410. TRANSMITTER TUNING CAUTION The Model 350 covers several frequency ranges outside the amateur bands. Care must be exercised not to transmit on these frequencies. Tuning of the transmitter is not complicated, provid- ed the few simple steps are followed in the correct order. Do not attempt initial tuneup without first performing the procedures for Receive operation described above. The following procedures assume that the unit has been checked out in Receive posi- tion, and a high impedance push-to-talk microphone is inserted in the MIC. JACK. »1. Press Push-to-Talk to place unit in TRANS- MIT, read the cathode current on the meter. #2. Quickly rotate the CAR. BAL. control on the front panel until the meter reads minimum cathode current. 3. Next, adjust the PA BIAS control on the rear of the chassis until the meter reads 50 ma. 9 4, If this is the first time the transceiver is being tuned on this band, set the PA LOAD switch to position 1. After experience in tuning up, the control may be set to whatever position has been found to be optimum on each res- pective band. Now, in rapid succession: 4 (a) Turn the CAR. BAL. control clockwise until a slight increase in meter reading is obtained. 4 (b) Rotate the PA GRID control for maximum meter reading. 4 (c) Rotate the PA PLATE control for mini- 15. 10 mum meter reading. *(d) Adjust car. bal. for a reading of 150 ma. IMPORTANT — Tuning the PA PLATE for minimum, or "dip", is known as "resonating" the power amplifier plate circuit, and is very important to preserving tube life. If the trans- ceiver is held in Transmit or TUNE position for more than a few seconds while out of resonance and with some grid drive, the 6HF5 tubes may be severely damaged. For this reason we repeat: CAUTION — Do not hold the transceiver in Transmit or TUNE position for any length of time without "dipping" the PA PLATE control. The PA GRID must first be "peaked" as in (b), above, and this requires some carrier supplied as described in (a), so it can be seen that these steps must be per- formed quickly. If the PA LOAD control is too far clockwise, it may not be possible to find a "dip" with the PA PLATE control. For this reason, be sure to observe thefirst sentence ‘in this section, Step 4. Rotate the REC, TUNE switch to TUNE position. Quickly check the PA PLATE con- trol for "dip" or minimum reading. If the meter dips to less than 500 ma., increase load- ing by rotating the PA LOAD controls clock- wise. After each increase in PA LOAD, resonate the PA PLATE again; that is, adjust it for dip. Continue increasing PA LOAD until the PA PLATE dips to 450-500 ma. Then switch back to RECEIVE. CAUTION: Do not hold the transceiver in TUNE position for more than 30 seconds at a time, even though PA PLATE is resonated. With full grid drive to the GHF5 PA tubes, which you have in TUNE position, they are dissipating considerably more power than they do during normal voice transmission, so a short tuning period must be observed. Under some conditions, it may not be possible to load up to 500 ma. This may occur with lower than normal line voltage or tubes not quite up to par, particularly on 10 meters. The current increase when tuning the plate circuit off resonance will provide a clue as to how far the power amplifier can be loaded. If the meter swings up to 600 or 700 ma. on either side of resonance, it will be easy to load 47. up to 500 or even more. But, if the tubes draw just 500 ma. off resonance, you can only load to 400 or 450 ma. This is not necessarily a sign that you have a problem. Peak input power with voice modulation will still be 400 watts when you load to 400 ma. in TUNE position. A new pair of PA tubes may allow you to load higher, or possibly a new driver tube will help. Primarily, the level to which you can load will serve as an indication of when tubes are deteriorating. If you can load to 500 ma, when the set is new, and after a few months of operating you can- not get above 400 ma., or so, itis probably time to replace the 6HF5 tubes, and possibly the 6GK6 driver. The other tubes should also be checked at that time. AVERAGE PA LOAD SWITCH POSITIONS. The following positions are for a 50 ohm non-inductive load, and indicate approximat- ely where the PA LOAD switch will end if the antenna and coaxial cable are well matched. BAND PA LOAD SWITCH 80 POS. 7 40 8 20 9 15 о 9 10 10 A large deviation from these positions indi- cates a possible matching problem, although operation may still be quite satisfactory. PA LOAD switch positions below 5 will generally be needed only with very low impedance loads, such as a 75 meter mobile antenna with center loading coil. ok PR VOICE TRANSMISSION. After tuning up as outlined above, press the Push-to-Talk but- ton on the mike and carefully set the CAR. BAL. control for minimum meter reading. While speaking into the mike, slowly rotate the MIC. GAIN control until occasional peak reading of 175 to 200 ma. are obtained. With most microphones, the MIC. GAIN con- trol will be set between 9 and 12 o'clock, but it may vary considerably. The ALC circuit will help limit cathode current to about 200 ma., but turning the MIC. GAIN up too high will still produce flat-topping and spurious signals, so it is important to hold it down. The meter is quite heavily damped, and its reading with average voice modulation may not look very impressive, but the voice peaks are going well over the 400 watt power rating of your Swan transceiver, and signal reports will verify this fact. TRANSMITTER TUNING WITH SWR BRIDGE OR FIELD STRENGTH METER. If either of these instruments is available, they are highly recommended as a better method of tuning the PA Amplifier, since they provide a direct indication of relative output. With the SWR Bridge in Forward position, or with the Field Strength Meter set to pick up a portion of the radiated power, simply adjust the PA TUNE and PA LOAD controls for maximum output. This must be done quickly, limited to about 30 seconds, to limit tube dissipation as previously mentioned. This method will result in maximum possible out- put and efficiency, as well as maximum linearity. You will probably find that cathode current readings end up somewhat less than 500 ma. on 10 meters because grid drive is the least on this band. On 80 meters where grid drive is the greatest, maximum output will be reached at more than 500 ma. These are a normal condition. NOTE- The cathode current level to which the PA is loaded will have no bearing on tube life. When transmitting with normal voice modula- tion, average power input will be the same regardless of how high or low the PA was loaded while tuning. Peak output, linearity, and lowest distortion will go along with maxi- mum loading. In other words, you will not extend tube life by loading to a lesser degree. The secret to long tube life is simply to keep TUNE-up periods short and not too frequent. AM OPERATION (Single Sideband With Carrier) 1. Tune transmitter to full output on single side- band as described above. 2. Rotate MIC GAIN control to minimum full CCW. 3. With Push-to-Talk pressed, rotate CAR. BAL. control until cathode current is approximately 150 ma. 4. While talking in a normal tone of voice into the microphone, increase MIC GAIN setting until the meter kicks upward slightly. This setting will result in excellent AM transmission. CW OPERATION 1. Tune transmitter to full output as for SSB operation. Then, with transceiver in TUNE- CW position, adjust car. bal. for 400 ma. on all bands except 15 meters. On 15 meters a maximum of 350 ma. is recommended inorder to suppress unwanted spurious radiationwhich may become excessive when the drive is run above 400 ma. At 350 ma., CW power will still be a respectable 280 watts. 2. Insert CW Key inthe Key Jack provided on the back of the 350. Use a standard 1/4 inch diameter 2 circuit phone plug. 3. Add a .47 or .5 mf 200 volt capacitor across the Key. This capacitor may be added in- ternally to the 350 if desired. 4. Switch to TUNE-CW position to transmit. Back to RECEIVE for receiving. 5. Information on a sidetone modification circuit for the 350 will be furnished upon written request. [D. ALIGNMENT AND TROUBLESHOOTING | GENERAL The following procedures are given in the order performed during the factory alignment for the transceiver. For home servicing, only partial align- ment may be necessary. Read all procedures care- fully before commencing either partial or complete alignment. See Figures 4 and 5 for component placement. Equipment Required 1. Calibrated audio frequency signal generator, range 200 to 5000 cps. 500 watt dummy load with output meter Vacuum tube voltmeter Walsco 2543 coil adjustment tool oR ww Field strength meter 6. Calibrated RF Signal Generator Pre-Alignment Conditions 1. Neutralizing capacitors C413 set to mid-point and C315 set to approximately 3/4 turn from full compression. 2. Peak IF transformers for maximum back- ground noise with AF and RF gain full clockwise (either bottom or top core adjust- ment). 3. Loosely couple field strength meter to C318 (off pin 9 of V4) with alligator clip on ceramic capacitor body. 4. Transmit bias potentiometer full counter-clock- wise (maximum bias). VFO AMPLIFIER PLATE CIRCUIT ALIGNMENT With VTVM from pin 1 of V7, Receiver Mixer, to ground, on -15 volt scale, adjust VFO Amplifier Plate coils for peak VTVM heading as follows: VFO Dial Band | Frequency (kc) | Frequency (kc) | Coil 80 8,975 3,800 L104 40 12,300 7,125 L103 15 16,050 21,225 L102 10 23,325 28,500 L101 TRANSMITTER MIXER AND DRIVER PLATE CIRCUIT ALIGNMENT 1. Remove screen voltage from V4 and V5 by disconnecting the wire from terminal strip im- mediately adjacent to V5 base. (A, Fig. 5). 11 1 MODEL 8 TRANSCEIVER C Operation (Lont! FIGURE 6 BOTTOM VIEW, MODEL. año TRANSCEIVER FIGUER 4 TOP VIEW. MODEL 350 THAMCETVER КЁ эта БМ Be Li | A — a E Ca he = AA т O -— aL -, 3 Foe. bial hk 4 | a L В Ae ъ q ] : TE МЫ а TA cas ui EL ce EA a a E e i || 2. Connect VTVM across R412, 4.7K resistor be- tween pins 1 and 2 of terminal strip immedi- ately behind bifilar coil in crystal filter range -15 volt scale. (Points B and C, Fig. 5). 3. Set PA grid tuning to 1 o'clock, REC-TUNE CW switch in REC. position. Procedure: Adjust bandswitch to band shown, and adjust coils for peak VTVM reading as follows: ta Band rea. (кс) Adjust тен | | vow | Bop Tune 40 7,300 | L204,L304 Tune 20 14,350 | L203,L303 Tune 15 21,300 | L202,L302 Tune 10 29,200 L201,L301 ‘*Note: If VTVM and field strength meter exceed full scale reading, switch to REC. position, actuate push-to-talk circuit, and insert carrier with carrier balance control to keep reading on scale. Field strength meter and VTVM must both peak at same time since 1t is possible to tune the coils to the VFO frequency on 10 meters. Care must be taken that the coils be tuned properly. Following the above procedures, replace screen wire to pin 1 of terminal strip adjacent to VS. ALIGNMENT OF 5175 KC FILTER TRAP With RF and AF gain at midscale, feed 5175 kc signal to antenna connector and adjust L602 until the heterodyne signal is nulled to minimum. ALIGNMENT OF 13 MC FILTER TRAP Tune VFO to 14,325 Кс, insert RF signal to antenna at 13,000 kc and tune RF generator for heterodyne signal in speaker. Adjust L603 and 1,604 for mini- mum heterodyne signal. ADJUSTMENT OF CARRIER FREQUENCY A. With dummy load and output meter attached, tune transceiver for maximum output. B. Null out carrier with PTT pressed and set resting plate current to 50 ma with bias pot. C. Connect AF generator to MIC JACK, adjust MIC. GAIN full CCW. Procedure: 1. With AF generator at 1500 cps, increase MIC. GAIN to produce a 100 ma. reading on the meter. 2. Adjust Z801 for maximum meter reading. 3. Adjust both top and bottom cores of Z1301 for maximum meter reading. 4. Adjust MIC. GAIN for meter reading of 300 ma. 5. Set AF generator to 300 cps. Adjust C1402 for meter reading of 75 ma. P.A. NEUTRALIZATION With P.A. coarse load in position 1, set freq. to 14.150, PA Plate control at 9 o'clock, insert carrier and peak P.A. Grid control, adjusting Car. Bal control for 200 MA. Turn PA control slowly through resonance. Cathode current should dip smoothly and rise to 200 MA on the low capacity side of resonance. If, instead, thereis a peak above 200 MA either side of the dip, stop rotation of the PA plate control at the peak and adjust C 413 to reduce Ip to 200 MA. Repeat above check and readjust as necessary to obtain the desired smooth dip. For 10 meters, use above procedure but adjust #C 315. ADJUSTMENT OF L601 With transceiver tuned to 28.8 mc, and RF and AF gain at maximum, adjust L601 for maximum back- ground noise. S-METER ADJUSTMENT With antenna disconnected and with RF gain fully clockwise, set R605, located on rear panel, for full scale meter reading. Make sure no local signals are being received. VFO ALIGNMENT A locking type trimmer condenser is provided for each VFO range, of which there are four. The same range is used on both 20 and 80 meters. Dial tracking has been factory set by pruning the coil, and will not ordinarily require further adjustment. When dial calibration changes beyond the adjusting range of the front panel dial set control, calibration may be restored by carefully adjusting the trimmer for that range. It may be necessary to loosen the locknut. Be sure to tighten it again. The following chart lists the actual oscillating freq- uency of the VFO at band edges: Dial Frequency Oscillator Frequency 3500 (13.85) 8673 KC 3800 (14.15) 8973 4000 (14.35) 9173 7000 12,173 7200 12,373 7300 12,473 21,000 15,827 21,250 16,077 21,450 16,277 28,000 22,827 28,500 23,327 29,000 23,827 29,700 24,527 13 sreamby 10 NOA 224 SUYO M 07 “097 VOSduNS IM PBI STUIUINSEIW IBEHOA ITV SANO TIA TIA OLA '6A “SA ‘LA GA + >ARPSPO SPEIIO 3088 A € ALIAILISNIS YJIAIZOTY MOT RS ALIado1dur yopmspueyg '7 19g Æjodosdur] peoT 10 aid “PIO Vd 'I 3ARPA 9A 10 ‘LA ‘BA OLA “FIA “Z HAAN paung Apadordwy LO6Z “1 NI SOIINOHdOYUOIN waz100u] Aduanbaig r0je(osQ 19U189 “€ NOISSTYdANS waunsn{py peo yd 129310201 “7 ANVEIAIS LNAIOIJANSNI urge) ‘HIN dAISS9OX] ‘I 12941020] Asuanbaz J J0)B[[I2S() 1911189 “€ , , . 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C203 .002, 20% 1KV Disc C204 1.001, 5% 500V Mica C205 15, 5% 500V Mica C206 24, 5% 500V Mica C207 120, 5% 500V Mica C208 27, 5% 500V Mica C209 20, 5% 500V Mica C210 12, 5% 500V Mica C211 50, 5% 500V Mica C213 3.3 pf 10% 500V Ceramic C214 .1 mf 10% 200V Mylar C301 .01 +80-20% 500V Disc C302 .01 +80-20% 500V Disc C303 100 5% 500V Mica C305 100, 5% 500V Mica C306 15,5% 500V Mica C307 50, 5% 500V Mica C309 510, 5% 500V Mica C310 540, 5% 500V Mica C311 100, 5% 500V Mica C312 680, 5% 500V Mica C313 50, 5% 500V Mica C314 91, 5% 500V Mica C315 1.5-20 pf Mica Trimmer C316 15, 20% 3KV Disc C317 220, 5% 500V Mica C318 .002, 20% 1KV Disc C401 .002, 20% 1KV Disc C402 .002, 20% 1KV Disc C403 .01 +80-20% 500V Disc C404 .01, +80-20% 500V Disc C405 01, +80-20% 500V Disc C406 10 mf 150 WV Electrolytic C407 .01, +80-20% 500V Disc C408 .01, +80-20% 500V Disc C409 .01, +80-20% 500V Disc C410 .002, 1KV Disc C411 .002, 20% 3 KV Disc C412 .002, 20% 3 KV Disc C413 20 pf P.A. Neut. Trimmer C414 15, 20% 3 KV Disc C415 270, 5% 2500V Mica C416 270, 5% 2500V Mica C417 320 pf P.A. Tune C418 50 10% 6 KV Disc C419 100 10% 6 KV Disc C420 410 pf P.A. Fine Load C421 Two 150,5% 1 KV Mica C422 Two 1505% 1 KV Mica C423 330, 10% 500V Mica C424 330, 10% 500V Mica C425 330, 10% 500V Mica C426 330, 10% 500V Mica E. PARTS LIST | C427 C428 C429 C430 C431 C432 C601 C602 C603 C604 C605 C606 C701 C702 C703 C704 C705 C709 C802 C803 C804 C805 C901 C902 C903 C904 C1001 C1002 C1003 C1004 C1005 C1006 C1007 C1101 C1102 C1103 C1104 C1201 C1202 C1203 C1204 C1301 C1302 C1303 C1304 C1305 C1306 C1401 C1402 C1403 C1501 C1502 C1503 C1504 C1505 C1601 C1701 C1702 C1703 C1704 C1705 330, 10% 500V Mica 330, 10% 500V Mica 330, 10% 500V Mica .002, +80-20% 500V Disc .47 10% 100V Mylar O1 Disc S M .01 +80-20% 500V Disc .01, +80-20% 500V Disc .01, +80-20% 500V Disc 10, 5% 500V Mica 5, 10% NPO 100, 5% Mica 30, 10% 1 KV Disc 30, 10% 1 KV Disc .01 +80-20% 500V Disc 220 5% 500V Mica 430 5% 500V Mica .01, +80-20% 500V Disc .01 +80-20% 500V Disc .01, +80-20% 500V Disc 10, 10% 1 KV Disc .002 20% 1 KV Disc .01, +80-20% 500V Disc .01, +80-20% 500V Disc .01, +80-20% 500V Disc .01, +80-20% 500V Disc 2 pf 10% Ceramic .01, +80-20% 500V Disc 220, 20% 1 KV Disc .002, 20% 1 KV Disc .002, 20% 1 KV Disc .002, 20% 1 KV Disc 500, 10%, 500V Disc .001, 20% 1 KV Disc .01, +80-20% 500V Disc .47, 10% 100V Mylar .001, 500V Disc .01, +80-20% 500V Disc 220, 20% 1 KV Disc .0047, 10% 1000V Mylar .1 mf 10% 200V Mylar .01 +80-20% 500V Disc 220 20% 1 KV Disc .01, +80-20% 500V Disc .002, 20% 1 KV Disc .01, +80-20% 500V Disc .01, +80-20% 500V Disc 50, 5% 500V Mica 6-30 pf Ceramic Trimmer .01 +80-20% 500V Disc .01, 400V Mylar .01, +80-20% 500V Disc .01, +80-20% 500V Disc 100, 20% 1 KV Disc .01, +80-20% 500V Disc 80 mf, 150 WV Electrolytic 270, 2%, SM 470, 5% SM 430, 2%, SM 27,5% SM 430, 2%, SM C1706 C1707 C1708 5-12 Main Tuning .01, 500V, Disc 5 pf Trimmer C1709 22, N220 Disc C1710 10, N150 Disc C1711 5, N150 Disc C1712 5 pf Trimmer C1713 10, N150 Disc C1714 25, NPO Disc C1715 5 pf Trimmer C1716 .01, 500V, Disc C1717 2 pf Dial Set C1718 22, N75, Disc C1719 39, NPO Disc C1720 5 pf Trimmer C1721 5, N75 Disc CIA-B 85 pf per section RESISTORS R101 82 ohms R102 56 ohms R103 47K - 1 watt R104 12K - 2 watt R201 27K | R202 18K - 2 watt R203 4.7K - 1 watt R204 6.8K R205 4.7K R206 4.7K R207 27K R301 100K R302 270K R303 100 ohms R304 10K R305 8.2K R306 10K R401 2.2 Meg R402 1K R403 100 ohms R404 100 ohms R405 Selected R406 470 - 5% - 1/2 W R407 10K - 10 watt R408 1 ohm - 5% - 1 watt R409 1 ohm - 5% - 1 watt R410 10K Bias Pot. R411 10K - 1 watt R412 4.7K R413 4.7K R601 1 Meg. R602 56 ohms R603 47K - 1 watt R604 1K R605 1K - S-Meter Pot. R606 100 ohms R607 470K R609 10K RF GAIN R701 27K R702 22K - 1 watt R703 1K 15 R801 R802 R803 R804 R805 R901 R902 R903 R904 R905 R906 R907 R1001 R1002 R1003 R1004 R1005 R1006 R1101 R1102 R1103 R1104 R1105 R1106 R1201 R1202 R1203 R1204 R1301 R1302 R1303 R1304 R1305 R1306 R1307 R1308 R1309 R1310 R1401 R1402 R1403 R1404 R1501 R1502 R1503 R1504 R1505 R1506 R1601 R1602 R1603 R1604 R1605 R1606 R1608 R1701 R1702 R1703 R1704 R1705 16 470 ohms 56 ohms 47K 1K 100K 47K 100 ohms 47K 1K 100K 270K 22M 1 Meg. 100K 270K 1 Meg. 2.7K 100K 470K 1K 47K 27K 270K 120, 1 watt 1 Meg. A.F. Gain Pot. 470K 270K 470K 47K 47K 150K 4.7K 5K CAR. BAL. Pot. 47K 47K 100K 100K 27K 1 Meg. 27K 1 Meg. MIC GAIN Pot. 270K 2.2 Meg. 27K 800 - 10 watts 900 - 10 watts 27K 27K 750 - 10 watts 6K - 10 watts 100K 1K, 5% 1K, 5% 1K, 5% 470, 5% 2.7K RELAYS К1 4PDT Relay, 12 VDC Coil K2 PDT Relay, 12 VDC Coil CRYSTALS Y1401 5172.8 KC Car. Osc. Vil 6EW6 VFO Amplifier V2 12BE6 Trans. Mixer V3 6GK6 P.A. Driver V4 6HF5 Power Amplifier V5 6HF5 Power Amplifier V6 12BZ6 Rec. R.F. Amp. V7 12BE6 Rec. Mixer V8 6EWG6 1st I.F. Amp. V9 12BA6 2nd I.F. Amp. V10 12AX7 Prod. Det/ Rec. A.F. Vil 6BN8 AGC Amp./ Rect. V12 6GK6 A.F. Output Amp. Vi13 7360 Bal. Mod. V14 12BA6 Carrier Oscillator V15 12AX7 Mic. Amplifier V16 OA2 Voltage Regulator TRANSISTORS Q1 2N706 Q2 2N706 R1706 2.7K R1707 470, 5% COILS L101 23 mc - 2 uh 1,102 16 mc - 4 uh L103 12 mc - 7 uh 1,104 9 mc - 4 uh L201 28 mc - 2 uh L202 21 mc - 2 uh 1,203 14 mc - 3.2 uh L204 7 mc - 3.6 uh L205 4 mc - 11 uh 1,206 RFC - 200 uh L301 28 mc - 2uh L302 21 mc - 2 uh L303 14 mc - 3.2 uh L304 7 mc - 3.6 uh L305 4 mc- 11 uh L306 RFC - 200 uh 1,401 14 тс - 0.8 uh 1.402 4 mc - 6 uh 1,403 RFC - 38 uh L404 RFC - 200 uh 1,405 RFC - 17 uh 1,406 RFC - 55 uh 1,601 28 mc - 1.2 uh 1,602 5175 kc - 90 uh L603 13 mc, 30 uh L604 13 mc, 1.5 uh L701 RFC - 200 uh L1001 RFC - 200uh L1705 RFC - 200 uh L1706 RFC - 200 uh TRANSFORMERS Z301 Parasitic Suppressor Z401 Parasitic Suppressor Z501 Parasitic Suppressor 7,801 5175 kc LF. Trans, 7,901 5175 kc LF. Trans. 7,1301 5175 ke BAL. MOD. Trans, T1201 A.F. Output Trans. SWITCHES 5-1 Power On-Off 5-2 5-3 5-4 5-5 DIODES D401 D402 D601 D1601 D1602 (with R/1201 AF GAIN) REC-TUNE-CW VOX PTT A-B-C-D-E-F-G Bandswitch PA Coarse Load TS-2 ALC Diode TS-2 ALC Diode TS-2 S-Meter Diode IN 2974A Zener TS-2 Relay Quieting | G. POWER SUPPLIES GENERAL DESCRIPTION: The Swan Universal Power Supply systems are des- igned to provide all necessary voltages required by Swan Transceiver models 240, -250, 300-C, 350, and 400. The model 117-X basic A.C. supply is designed for an input of 117 volts at 50 or 60 cycles. The model 230-X is identical except that it operates with either 117 or 230 volts. For fixed station use, the 117-X or 230-X is installed in a cabinet which matches the Swan transceivers. This cabinet also contains a speaker, phone jack, and indicator light. The complete combination is desig- nated as model 117-XC or 230-XC. The A.C. line cord plugs into the back of the supply. In the 230- XC, provision for changing from 117 to 230 volts input is made by simply changing line cords. Wiring changes are taken care of in the line cord plug. 12 VOLT OPERATION: A D.C. Module attaches to the back of the A.C. supply and converts it for 12 volts D.C. input. the model 14-X D.C. Module is for negative ground systems, the most common type. (For positive ground systems, the model 14-XP D.C. module is available.) The combined units are designated as model 14-117 or 14-230 depending on which A.C. supply is used. The positive ground models are designated as model 14P-117 or 14P-230. With the versatility of this power supply design, a number of advantages become apparent. The D.C. supply may be operated from an A.C. line by detaching the D.C. module, making a simple wiring change, and plugging in an A.C. cord. (See instructions under " Mobile Installation.") The matching A.C. supply, model 117-XC or 230- XC, may be converted easily to 12 volts input by attaching the 14-X D.C..module to the back. This provides for portable or emergency operation from a 12 volt battery. There may also be times when it will be desireable to operate temporarily in an auto- mobile, such as during a vacation trip, field day, or emergencies. The 117-XC can be set on the floor or front seat, and with the 14-X attached it becomes a 12-volt power supply, complete with speaker. SPECIFICATIONS: Power Rating: 200 watts average, 500 watts peak. Input: Model 117-X: Model 230-X: cycles. Model 14-X: peak. Output: 800 volts at 200 ma. average, 600 ma. peak. 275 volts at 150 ma. continuous. 110 volts negative bias, at 100 ma. 12 volts D.C. at 200 ma., relay supply. 12.6 volts A.C. at 5.5 amps. (with A.C. input only) 117 volts nominal, 50-60 cycles 230 volts or 117 volts, 50-60 13 volts D.C. nominal, 40 amps Fig. 6. MODEL 117-XC AC POWER SUPPLY WITH SPEAKER Fig. 7 MODEL 14-117 DC POWER SUPPLY Battery Drain with Swan Transceiver Rec: 3.5 amps. Trans: 16 amps average, 40 amps peak (not including filament drain of transceiver). DESIGN: Both the A.C. and D.C. sections are conservatively designed for long, reliable service with a minimum failure rate. At the same time, they are designed for easy access and servicing for those times when it is required. Any component can be readily check- ed out and replaced in a matter of moments. The D.C. module and A.C. supply can be detached quick- ly from one another and tested individually, thus isolating the source of trouble. The A.C. suppy is quite conventional, using a silicon rectifier bridge for the medium voltage, and another for high voltage. The 117-X has a single primary winding for 117 volt input, while the 230-X has a pair of primary windings which connect in parallel for 117 volts, and in series for 230 volts. The switching is taken care of in the A.C. line cord plug. * The D.C. module uses two power transistors for switching in a flip-flop oscillator circuit. A large portion of the cost in this unit is in the transistors where no compromise has been made. They are rated at 60 amperes, with a 45 volt rating. A diode spike clipping circuit provides additional protection against one of the common sources of transistor failure. 17 MOBILE INSTALLATIONS READ CAREFULLY The 12 volt electrical system in an automobile will sometimes generate high voltage transients. This can be caused by the starter motor, the alternator or generator, or loose wiring, and can represent a serious hazard to the transistors in your DC power supply. By selecting the best transistors available for the application, your Swan supply is capable of absorbing a good deal of abuse, but there is a limit to what even the best transistors can take and for this reason we strongly urge that you read the following notes completely, and follow them care- fully. (1) Clean and tighten the battery terminals and clamps. Tighten battery cables where they attach to the starter solenoid and engine block. (2) Inspect battery cables for corrosion or wear. Replace them if they look questionable. Check battery condition frequently. If the cells do not hold a similar charge or water level, replace the battery. (3) (4) Check alternator, (or generator), and regulator connections for tightness. Also, primary igni- tion wiring, horn wiring, lights, etc. (5) Check the charging voltage from the alternator. Often the regulator is misadjusted, and the voltage setting may be excessive. It should not read more than 14.5 volts at normal engine speeds. (6) POWER SUPPLY INSTALLATION: (A) Connect the primary leads from the power supply directly to the battery terminals. Mount the ceramic fuse block with 50 amp. fuse in series with the positive lead. (With positive ground systems, the fuse goes in the negative lead). If possible, drill and tap a hole in the battery post itself for a contact stud. The more intimately the supply is connected to the bat- tery, the less chance there is for voltage trans- ients to reach it. Solder lugs are provided for the ends of the various leads. The filament line comes prewired to the Jones plug, and has an in-line 9 amp. fuse. Con- nect this line to the ignition switch accessory terminal, as recommended in the schematic, Fig. 8. In most cars the 12 volts at this ter- minal is switched off while twisting the ignition key to start the engine. Thus, the relay in the power supply will also be turned off, and the transistors will not be subjected to the sharp transients put out by the starter motor. NOTE: The car radio is normally connected to the accessory terminal for the same reason. It may be more convenient to locate the 12 volt line going to the car radio, and splice into it with the transceiver filament line. Look for (B) 18 | SWAN MODEL 14-X D.C. MODULE | 27.0 10W 1N400L GRAN Sn ЮЖ Son + AA pr MHT 1840 350-10 | 114002 | Y Y А” 7 LK +17 250MF YY 25 WY Me AED — _ T4 + ls | MHT 1840 = | Тов BLUE sa low ATA OW SE EEE YEE EE Ge Ear 1 delo BAT.CABLE § - | + AGU | — 250 MP 50 AMP. | к! AV el 1 nn 1N4001 I 1 2 | - - 1 == 12 VOLT Ш BATTERY NEGATIVE GROUND ONLY Za. WHITE a [I BLACK - »(3) 1 BROWN a 1 1 р > (à GREEN _ | Sam” @ НТ Го +12 IGNITION SWITCH TERMINAL ACCESSOR TERMINAL. Up NUMBERS, H7-X AS SUPPLY [sones PLUG TO SPEAKER SWITCH. f DPDT (OPTIONAY[ PREWIRED PLUG AND CABLES SUPPLIED WITH MODEL 14-X TO CAR RADIO CAR RADIO SPEAKER WAN TRANSCEIVER FIG. 8 MODEL 14-X D.C. MODULE the car radio fuse, and connect to this circuit on the "hot side”. POWER SUPPLY PROTECTION—A Zener diode is installed in the Swan 14-X DC module for added protection. It is an 18 volt Zener which connects across the input terminals of the power supply. It conducts only when the input exceeds 18 volts, thus has no effect on normal operation. Transient volt- age pulses which go beyond the 18 volt level will be absorbed by the diode, thus preventing them from reaching the transistors. This protection will be effective so long as the diode is operative. If transients reach a high enough level, or a long enough duration, the diode will eventually fail, and literally burn out. After this, the transistors are on their own, and will most likely fail for the same reason. (See Warranty Policy) SPEAKER CONNECTIONS: Speaker leads com- ing from the Jones plug go to an under dash speak- er, or to a speaker selector switch which may be installed as illustrated. Another arrangement which works well is to install a rear seat speaker for the car radio, and then connect the front speaker only to the transceiver. [ swan MODEL 117-X (230-X) A.C. POWER SUPPLY 4 TI- t К, (271-008); ] (orn) 2 1%0v > 600 РМ, ТА 800 100 MF 150 WY 100 Plv, TA 117 VOLT PLUG . FOR MODEL IX [10 u = ODEL. 230-X AND M 23 La t 1 3AG- ICA JONES PLUG TO SWAN TRANSCEIVER 2 PREWIRED PLUG, CABLE AND SPEAKER SUPPLIED WITH 117-XC CABINET 1 PHÔNES SPEAKER N H7-XC CABINET INDICA oR LIGHT 230 VOLT PLUG Ww y FOR MODEL 230% |19_ ms Te 8 49 + 4% ЗАО - FA SNS FIG. 9 MODEL 117-X (230-X) POWER SUPPLY A.C. OPERATION: The 12 volt power supply may be operated from an A.C. line by two methods. (A) Detach the D.C. Module, and plug in an A.C. line cord in place of it. Before applying power, disconnect the brown cable wire going to terminal (1) of the A.C. supply and connect a jumper from terminal (1) to (2). Temporar- ily tape the brown wire to keep it from shorting to ground, since it will be carrying 12 volts D.C. Now the power supply will operate when the A.C. line is plugged in, although the trans- ceiver filaments will still be operating on the battery. This arrangement will be useful prim- arily for checking out the A.C. portion of the supply when trouble shooting. (B) To operate the transceiver entirely on the A.C. line, it will be necessary to do the following: Disconnect the 5 wire cable going from the the transceiver to the A.C. portion of the sup- ply. Replace it temporarily with a 10 wire cable and hook-up as illustrated in the schema- tic diagram Fig. 9. This is the same cable and speaker hook-up used in the matching cabinet, 117-XC. Using the D.C. supply in this manner will prove useful for portable or emergency operation from the car when A.C. power is available. If frequent A.C. as well as D.C. operation with the mobile supply is contemplated, both the 5 wire and 10 wire cables may be connected simultaneously to the supply. Thus, when operating on D.C., the 5 wire cable is plugged into the transceiver, and on A.C. operation the 10 wire cable is used. MATCHING CABINET: Ordinarily the A.C. supply will be purchased com- plete in a matching cabinet as either model 117-XC or 230-XC. However, in some cases an owner may have purchased a 117-X or 230-X basic supply only, perhaps in a D.C. supply combination, and he may wish later on to mount it in a matching cabinet. For this purpose the cabinet with speaker and cables is available separately. The basic A.C. supply mounts inside with three screws, and the pre- wired cable connects as shown in the schematic. Connections to the phone jack and speaker have already been made. Two leads from the indicator light must be run through the grommet and solder- ed to the terminals provided at the bottom of the 19 suppl. Ber to de ыы Вс Км Ма Лок The AC Ema coed 16 alo provided mith tha mani: Ing cabinet ki Teese Ene corde are avélläble sep aradaly Bho. and come rormaly wired ond siamged far 117 volta 40 velt lin: coeds arp alao mad be on nouclal ceder, e the L117 wold line cord may as be wired hor 330 vela by referring + Ehe acemato Mote tha the 230 voy Jime cord wi wore coli with the EHX basic AC. supply. The Fr LIT wok Poe oord wil work wiih clther the 117-X ог СЫРА POR ER SUPPLY Wa REANTY POLICY —The normal guarani ba On pour Fenn power supply № form period of TH) claws room date of purchaen, ul cored oll comperente, maria) and esorkmenebip, le he cos: of inamelsior éail- h ure, maróvif, TEE Varraniy cs Ls wii be vole E Inspection proves (hal bigh irencemt smliagm [fem de ОНТ bie wera ra pos dale Te will do wll ia our poser bo be Pour mad ust Im His daceminadoo, The warranty card trail be ELed quí and maáiked lo Te lazorr within EF cayo dro dake df purchase ET ; - = or ship & unk to due Me for parrizing FIL 10 MODEL 143, IRC. MODULE baut prlor auhorzabicr. Check wits your (A TRENAL VLEWS dealer first, as he may El ln a posios ina harudle de serelee work mor qubdar. This Varranir la void if Ev equipar hs bon misured or damaged. FIC. 11 MODEL 117-X BASIC AC FO ER SUPPLY INTERNAL VIEW under side of dash with large sheet metal screws, Bracket — FIG. 12 — Cabinet INSTALLATION TYPICAL MOBILE MOUNTING 19:58" Locate the best cabinet slot for mounting, and attach hardware as illustrated "E CN hr Lock Washer Flat Washer OUTBOARD VFO OPERATION WITH THE 350 Various outboard VFO operations are possible with the Swan 350. SPLIT FREQUENCY OPERATION For those desiring to work split frequency, transmit on one— receive on another, the model 22 DUAL VFO ADAPTOR is required. ( Seepage 27) Com- plete instructions are also supplied with each model 99. Included with each model 22, is a prewired socket/harness assembly which is mounted in the accessory hole, punched in the rear of the 350 chassis. This assembly is referred to as the "ac- cessory socket". (See page 28) MARS OPERATION For operation on Mars frequencies with the Model 405 oscillator, (See "Accessory" section) use of the model 22 is not essential. The accessory socket, only, can be used and is available on special order for $3.00. Included with the accessory socket are complete installation instructions. (See page 28) Follow steps one through four on this page. Delete "Orange, Blue and Green" in step five and all of step six. A jumper plug is also included with the ac- cessory socket which, when plugged into the installed actessory socket will restore the 350 built-in VFO. TRUNK MOUNTING In the case of a remote installation, such as the 350 being mounted in the trunk of an automobile, and using a model 406 VFO with the Swan RC 2 remote control kit, the above use of the accessory socket is suggested with variations as outlined (See page 37) For use of the outboard VFO gain control (Model 406, 410 or 420) while operatmg in conjunction with the model 22 adaptor with the 350 transceiver, the two RF pots can be wired in parallel. Which- ever pot is not in use is turned completely counter- clockwise. It will be necessary to sacrifice the pilot lamps in the outboard VFO. Wiring changes are as follows: 1. Disconnect the 12 Volt wire from pin 5 of the auxilliary socket. 2. Connect a wire from pin 7 of K1 to pin 5 of the auxilliary socket. (This is common to the wiper of the RF gain pot in the 350). 3. Remove the wire from pin 5 of the VFO cable connector and tape it. 4. Move the lead from pin 4 of the VFO cable connector over to pin 5. For operation of the outboard VFO RF gain control when not using the model 22 adaptor, but only the auxilliary socket, make wiring changes as follows: NOTE —Pins 6 and 7 of the auxilliary socket are not used without the model 22 — simplex operation of outboard VFO. With this configuration, there is no need to sacrifice VFO pilot lights. 1. Follow steps 1 thru 5 in modification instruc- tions. Delete "Blue and Green" in step 5. 2. Remove grey wire from pin 4 of auxilliary socket and connect it to pin 6. 3. Connect a wire from pin 7 of KI to pin 4 of auxilliary socket. 4. To restore inboard 350 VFO operation, use a jumper plug with a jumper between pins 3 and 6 and a jumper between pins 1 and 8. 21 NEW R.F. GAIN CONTROL WITH PUSH- PULL SWITCH «---- OUTPUT ta COUPLING 27K 100|K | MEG SS Ir PUSH—PULE — SWITCH — — —— — — —— и — | SWAN-350, CRYSTAL CALIBRATOR KIT PICTORIAL | FIG. 13 22 SWAN 350, CRYSTAL CALIBRATOR KIT. INSTALLATION INSTRUCTIONS PARTS LIST: 1 - Pre-wired tube socket V17 10. 11. 12. 13. 2 - R. F. Gain Control with push- pull switch 3 - Mica trimmer 4 - Crystal Socket 5 - 12BA6 tube 6 - 100 KC crystal 7 - Red and Green-Black wires 8 - Two 4-40 screws, nuts, washers. Locate the empty tube socket hole in the 350 chassis. Remove the 4-40 screw and nut from the mounting hole. Mount the pre-wired socket in this hole, posi- tioned as shown in the illustration. Be sure to include the ground lug on the chassis top side which was secured originally by the 4-40 screw. Use another 4-40 screw washer, and nut in the other mounting hole. Mount the mica trimmer in the chassis holes as illustrated. Make sure the ground end of the trimmer goes to "D" as shown. This is the end of the trimmer with the most metal showing on the bottom, and goes to the top compression leaf. Bend the tabs over firmly to hold the trimmer in place. Mount the crystal socket with a 4-40 screw and nut. Connect the bare wire from Pin 1 of V17 to lug "C" of the trimmer and lug "A" of the crystal socket. Solder both connections. Connect the bare wire from ground lug at "E" to trimmer lug "D". Do not solder. Locate the 1 meg. resistor which comes con- nected to Pin 1 of the tube socket. Connect its other end to trimmer lug "D". Solder connections at " D”. Connect the sleeved wire from Pin 6 ofthe tube socket to lug "B" of the crystal socket. Solder at lug "B". Connect the new red wire from terminal "F" to "G" (+275 volts). Solder "G" only. Connect the 100K resistor from Pin 6 of the tube socket to terminal "F". Do not Solder. Connect the 27K resistor from Pin 5 of the tube socket to terminal "F". Solder terminal " Е". Connect the brown wire from Pin 3 of the tube socket to Pin 3 of V7. Solder at V7. (12.6 volt heater lead). Loop the sleeved wire from Pin 5 of the tube socket around one lead of C605. Do not actually connect the wire. A very small amount of capacity is all that is required at this point for coupling. 15. 16. 17. 18. Locate the R.F. Gain Control! on the front of the chassis, and disconnect the wire lead going to its center lug. Then remove the contro! from the set. Replace the control with the new one which has a push-pull type switch on the back. Con- nect the wire lead to its center lug, and solder. Dress the Green-Black wire from " H" on the switch neatly across the chassis and to Pin 7 of the tube socket. Solder. Plug the 12BA6 and 100 KC crystal into their respective sockets. To turn on the calibrator, simply pull the R.F. Gain Knob out. Push in to turn it off. The frequency of the 100 KC crystal can be adjusted exactly by tuning in WWV on a gen- eral coverage receiver, and heterodyning the 100 KC harmonic. This can be done by running a pick-up lead from the general coverage receiver antenna terminal over to the transceiver, and wrapping it around the 12BA6, 100KC oscillator tube. Then with the 350 in receive position, turn on the 100 KC calibrator by pulling out the R.F. Gain Knob. Then adjust the mica trimmer which has just been installed for zero beat with WWV at 5, 10, or 15 mc. This can be done most easily during the 2 minutes of each 5 minute period when WWV is not transmitting a steady tone. 23 NEW SWITCH ORIGINAL SWITCH PICTORIAL Crystals N Normal 5172.8 | Sideband Trimmers 5176.8 Opposite Sideband REC. TUNE-CW REC, TUNE-CW \_/ TION SWITCH FON on CH | NORMAL SIDEBAND, OPPOSITE SIDEBAND, S S USE POINTER USE WHITE DOT 20 5172.8 к ое + Е ——луу I # C1402 В (WHE LK > LT 6-30 pf R1311-47K da AAA AN > FRONT SECTION R1608 FIG. 14 SCHEMATIC KEY 2 SECTION SWITCH SHOWN FRONT VIEW, COUNTERCLOCKWISE POSITION POS. 1 - Receive, Normal Sideband (GRY- RED) | T7 CAR. OSC. V 14 12BA6 POS. 2 - Tune/CW, Normal Sideband POS. 3 - Receive, Opposite Sideband POS. 4 - Tune/CW, Opposite Sideband SWAN - 350, SIDEBAND SELECTOR KIT. 24 Swan Electronics Corp., Oceanside, Calif. SWAN 350 SIDEBAND SELECTOR KIT Installation Instructions Step 1 - Step 2* Step 3 - Step 4 - Step 5 - Step 6 - Step 7 - Step 8 - Step 9 - Step 10 - Step 11 - Step 12 - Step 13 - Remove the bottom cover of Swan 350. Locate the REC. TUNE/CW switch. Ref- er to drawing of the "Original Switch", Fig. 1. Note the color code of wire going to lugs A-C-B-D-E. Write these colors on Fig. 1 for reference. Remove the 47K resistor which goes from the switch to terminal strip, point 1. Remove the ground wire which goes from the switch to V11 ground lug. Remove the 50 pf silver mica which goes from the switch to Pin 6 of V14. Save this capacitor. Remove the sleeved wire which goes from point L to Pin6 of V14. Save. Remove the wire which goes from point M to Pin 1 of V14. Locate the 27K resistor which goes from point J to point L. Disconnect from point L and connect instead from point J to pin 6 of V14. Remove the original switch from the set. Place the new switch part way in, and ro- tate so terminals D and E can be reached. Connect the wires which went to D and E of the two empty lugs of the new switch. Be sure to connect D to D, and E to E. Turn the new switch so the front key lo- cates properly, install the mounting nut securely. Put the knob on the shaft, and tighten the set screw. Connect the wires that went to A-B-C of the original switch to A-B-C of the new switch. Note that B and C are inter- changed in the Fig. 1 drawing. Mount the new ceramic trimmer, using the 4-40 screws and nuts. Connect wires from the new switch to points as listed: Yellow wire to Pin 1 of V14; Gray-Red wire to Pin 6 of V14; Orange-Black wire to M; Red-Yellow wire to L; White-Black wire to N; Blue wire to R; 47K resistor to K. *SPECIAL NOTICE, concerning Step 2: (a) - (b) - (c) - On later series 350's, the 47K resistor men- tioned in Step 2 is no longer used, and term- inal K is vacant. Refer to the "Original Switch” drawing, Fig. 1. A wire will be found going from Pin 8 of the 7360 tube to the switch lug located just to the right of lug D. Find the corresponding switch lug on the new switch supplied with the kit. A 47K resistor (d) - will be found connected to this lug. Clip this resistor off and discard. Connect thewirefrom Pin 8 of the 7360 tube to this switch lug. Disregard the last part of Step 13 which refers to the 47K resistor. Step 14 - Connect a wire jumper from O. to R. Step 15 - Connect a wire jumper from S. to Q. Step 16 - Connect the 50 pf capacitor (saved from step 4) from S. to N. Step 17 - Make certain all connections are soldered, and located correctly. Step 18 - Plug the new 5176.8 KC crystal into its socket. CARRIER FREQUENCY ADJUSTMENT, OPPOSITE SIDEBAND NOTE - It will not be necessary to readjust the nor- mally used carrier frequency. Installation of the sideband selector kit has a neglig- ible effect on frequency setting of the 5172.8 KC crystal, so do not change the setting of the original ceramic trimmer. An audio generator is required for exact set- ting of carrier frequency. Couple the AF. generator into the Mic. Jack with a 3 circuit plug, the same type used with the microphone. Connect a switch to the PTT terminal of the plug so the transmitter may be turned on, (the same function performed by the push-to-talk switch on the microphone). First, tune the transmitter for normal output on the normally used sideband. Then switch to opposide side- band, and with the A.F. generator set to about 1200 cycles, adjust the Mic. Gain for a meter reading of 300 ma. Then change the A.F. generator to 300 cycles, and adjust the new ceramic trimmer for a meter reading of 150 ma. This corresponds to a roll-off of 6 db at 300 cycles. (The same procedure may also be used to check and adjust the normally used sideband carrier) If an audio generator is not readily available, approximate adjustment may be made by the following method: Tune for normal output on the normally used sideband. Then switch to the opposite sideband, REC. position. Push the Mic. button, and adjust Car. Bal. for minimum meter reading. If the carrier freq- uency is too far up the filter slope, you will find that the Car. Bal. null adjustment is very sharp. Adjust the new ceramic trimmer so that the Car. Bal. adjustment is not so sharp. If the frequency, is too far down the slope, you will find that Car. Bal. must be turned full CW or CCW to show much increase on the meter. In this case, adjust the trimmer for more carrier, but not so much that the Car. Bal. adjustment becomes too sharp. This approximate adjustment procedure will generally suffice for most operating. 2 5 VOX GAIN ©] RCVR OUTPUT 6| +12V 7| PTT 8! PTT GND. GND 4; -1OV MIC. AMP. Ql Q2 Q3 QA, 2NI274 as, 2N1302 | — OCTAL PLUG SWAN ELECTRONICS Oceanside Calif. VX—-1 SCHEMATIC voice Control Accessor 8-3-65 FIG. 15 OPERATING INSTRUCTIONS 1. 26 Place the VOX-PTT switch in the PTT position and adjust the transceiver for normal push- to-talk operation. Plug in the VX-1 and rotate the VOX GAIN, ANTI-VOX, and DELAY controls fully coun- ter-clockwise. 2Attach the top of the VX-1 to the 350 back with a G-32 screw. Rotate the transceiver MIC. GAIN fully coun- ter-clockwise. This will prevent audio from being transmitted but will not affect VX-1 during initial adjustments. Place the VOX-PTT switch in the VOX posi- tion. ` While speaking into the microphone in a normal manner, slowly rotate the VOX GAIN control clockwise until the VX-1 keys the transmitter. Do not use more VOX GAIN than necessary to assure positive operation at normal voice levels. Increase the receiver gain until received sig- nals are at a normal volume level. These For Swan 250-350 -40 PLUG IN VOX ACCESSORY, MODEL VX-1 signals will trip the Vox when picked up by the microphone. With the microphone held in the normal operating position, very slowly increase the ANTI-VOX until received signals do not trip the Vox. NOTE: Excessive ANTI-VOX gain will cause received signals to gate the VX-1 off so that no amount of sound at the microphone will key the transmitter. Satisfactory balance be- tween the VOX GAIN and ANTI-VOX is easily obtained when the microphone is at least a foot from the speaker. Adjust the DELAY control to hold the trans- mitter keyed for the desired interval after you stop talking. NOTE: A little experimenting on the air will reveal that only a small portion of the first spoken syllable is lost when the VX-1 is act- uated. Short DELAY settings will result in most efficient operation. FIG. 16 12.6 VAC RED WITH | 250 ONLY 9 | A a 5 ! | { - О BLUE A 7 3 External VFO | 5 for Swan-400 +— only —— 12 | 4 o ts. | | > E hy, 5 J (9 - Ww | [+ 4 31 lz K3 oui je 9000.0. in] (Le N A + + 33 K 2 wW External VFO for Swan-350 VFO Selector Switch Pos. Pos. Pos. 1 - Transceive on VITO "A" 2 . Transmit on VFO "A", Receive on VFO "RB" 3 - Transceive on VFO" B". and 400. NOTE: When used with the Swan-350. VFO "A" is the internal and VFO "BR" is the external VFO. Socket "A" on the adaptor is not used with the 350. There are presently 3 models of Swan external VFO's. Any one of them may SWAN MODEL —22 DUAL VFO ADAPTOR be used with the 350, and any combination of two of them may be used with the 400 transceiver. Model-410, full coverage: $95 Model-406B, phone band, minature size: $75 Model405, fixed channel: $45 Provides for addition of an external VFO to the Swan-350 single sideband transceiver or for use of two VFO's with the Swan-400. SWAN ELECTRONICS CORP. Oceanside, California NOTE: Model-22 comes wired for use with the Swan-350. For use with the 400, see page 3. NOTE: REF Gain Control remains on the 350 trans- ceiver. nal VFO, see Special Note below.* NELET E) MOUN TING SCREW MODIFICATION INSTRUCTIONS, for installation of Model 22 adaptor socket in Swan-350transceiver. 1. N ‘ae, R 700 LA 000 => 5 \у If RF Gain Control is desired on the exter- RIOOZ2 300 n VFO AMP. v1-6E WE _® ® обе > ADD NEW ESISTOR mm — To V7, PINTS TO RELAY, KI I2Z2BECG JE ’ REC, MIX. 12.6 V BLUE (+215 on REC) ORANG X GREEN GRAY To RELAY, Kt TERM. 10 (4215 CONT) JO ; 9 PIN SOCKET! SHIELD WIR COA MOUNTS ON e X. B BACK OF | ne | SWAN-350 | FIG. 17 | CHASSIS | Install the pre-wired socket in the accessory location on the back of the 350. Be sure to orient the socket keyway so the Model-22 adaptor will plug in correctly. Secure the mounting screws tightly, 7. The Model-22 adaptor may now be plugged i” " ra fr in 1 of tube socke into J6. Secure it to the back panel of the e the Мис Tom pce ии © Ds El 350 with the screw which is provided. The the 6 EWG VIO amp. Connect coax. A external VFO plugs into socket B. to pin | insteud, and its shield to pin 7, which is grounded. Be sure to leave the 82 ohm * Special Note: resistor connected from pin 1 to ground. (a) After the above modifications have been Disconnect the other end of the wire from eye- made, an external VFO may be plugged di- let terminal "KE" on the circuit board. Solder rectly into J6 without using the Model 22. coax. B to this eyelet, and attach its shield This feature is useful in cases where the 350 wire to the grounded mounting screw with the is to be truck mounted and a 406B is instal- led on the dash. Pin § of J6 may be wired lug provided, to carry the RF Gain Control to the external Remove and discard the wire lead going to VIO. “Connect the orange wire from pin 5 term. lug “+ on the circuit board, and con- of J6 to the bottom end of R602, 56 ohms, nect the new gray wire to lug " T". 1/2 watt. connect the ed, Orange, Blue, and Green (b) The internal VFO can be made operational cad 0e iHustrated without plugging the 22 udaptor in by using Conta the new TO000 vlun 5-watt resistor a jumper plug instead. Jumper pin 1 to pin to tenon sups KR us illustrated. 8 and pin 3 to pin 4. SWAN MODEL 406B FREQUENCY CONTROL UNIT Model406B Frequency Control Unit is designed for full phone band coverage of 80, 40, 20 and 15 meters, and one 500 kc segment of the 10-meter band. The unit is specifically intended for mobile operation, and provisions for mobile mounting have been incorporated. CIRCUIT THEORY Q1, the 2N706 Oscillator operates in the common base configuration, as a Colpitts oscillator. See Figure 6. Capacitors C1801, C2001, and C2003 effectively tap the oscillator across only about 10 percent of the tank circuit. This results in excep- tional stability. Q2, the Emitter Follower, is used for matching the impedance of the coaxial cable to the transceiver, as well as for isolation. The band- switch selects the appropriate coil and trimmer for each range. Dial tracking is adjusted with the core and trimmer. With proper adjustment of coils and trimmers, the Model 406B may be used to cover any 200-kc segment in the 80- through 15-meter amateur bands, and any 500 kc segment of the 10 meter band. INSTALLATION A universal mounting bracket and mounting screws are supplied with the Model 406B. This bracket may be either top mounted, or bottom mounted, depending on where the 406B is to be mounted in the car. Many of the newer cars have a padded overhang. In other cases, attaching the mounting bracket. to the bottom of the 406B will allow instal- lation on a top surface. A row of small holes are provided along the sides of the 406B cabinet for top mounting of the bracket. You will find that the bracket will also allow tilting of the 406B. For bottom mounting, it will be necessary to drill addi- tional holes along the bottom of the cabinet. Re- move the cabinet first, and you will find chassis holes already provided for this purpose. Simply add these same holes to the cabinet. ALIGNMENT Alignment of the Model 406B requires only the use of a general coverage receiver tuning the frequency ranges between 8 mc and 24 mc. Calibration of the receiver is not critical since the crystal calibrator in the transceiver is used for final adjustment but the receiver must be accurate within 50 kc to permit selection of the proper 100 kc harmonic. FOR MINOR FREQUENCY ADJUSTMENTS, which may be required after the initial aging period, simply remove the cabinet cover and very carefully adjust the trimmer capacitor marked for the specific range. FOR MAJOR FREQUENCY ADJUSTMENTS Tune Frequency Control Unit to low end of- fre- quency range, and locate heterodyne with general coverage receiver at frequency indicated in the fol- lowing table. Adjust vernier coil to bring heterodyne within a few kc of the receiver frequency, then switch on calibrator and adjust vernier coil for zero beat with calibrator at 100 kc increment of dial. Move tuning to high end of tuning range and adjust trim- mer capacitor for zero beat. Repeat high and low end adjustments until calibration is correct at both ends. Coil and capacitor locations are marked in the unit. 406B OSC. ADJUST {| ADJUST FREQ FREQ. COIL CAP. RANGE (ke) (Low end) | (Hi end) 3.8-4.0 Low-High 1,1801 С1804 14.15-14.35 8973-9173 7.1-7.3 12,273-12,473 1.1802 C1810 21.25-21.45 116,077-16,277 1.1803 C1813 28.5-29.0 123,327-23.827 1,1804 C1807 29 CIRCUIT BOARD MOUNTED COMPONENTS C 2001 - 470 € 2004 «27 It R2001 1K, 5%, 1/2 Watt _ _ a lia _ dz _ _ R2002 1K, 5%, 1/2 Watt LA! —»”. R 2003 1K, 5%, 1/2 Watt ar © R2004 470,5%, 1/2 Watt 4 se 2N706 o R2005 2.7K,10%, 1/2 Watt © = ‚ © 2005 - 430 к 2006 2.7K,10%, 1/2 Watt ~ ' о то (>. к 2007 470, 5%, 1/2 Watt ! sx < [3 185 = o ‘ C2001 270, 2% Silver Mica 2 sf. ‘ ‘ ua a + C2002 .0015 Ceramic Disc 5 = a pes $ o N м C2003 430,2% Silver Mica C1801 2 © > 3 © 5 © — C2004 27, 5% Silver Mica 22 eka = = = = ~ ~ C2005 430, 5% Silver Mica T + + = к C2006 , 01 Ceramic Disc C 2002 1.2001 250 uh RFC 1 „0015 Ql 2N706 = Q2 2N706 = - == С 2006 - .01 SWI891 Range Selector — — неее ВО - === — == R.F. GAIN $ ' 5 \ R 1801 - 10K e ` ` a Q ©- | os C1802 | C1803 | pf 5-12 о © y > 1.1801 = L1804 a À 4 вы vr = 7 a 2 un 7. 2 1 1 t ~ = < | 5 | 3 Î © 5 |= PL 1801 - 4756 = = с lo |5 о lo lo O) DIAL TUNING 4 > a. 0 SET 3. В - 4,0 28.5 - 29,0 { ~~ 14, 15 - 14.35 DIM — — SW 1802 К 1802 -100 1.1802 у 11803 q TT = 7 > > LA 7 o a © Lots - + la = |Z 1% » |e |» 75 OHM v Jv Ju © Ju Ju 6 7 9 Y COAXIAL CABLE x ue P1801 ; | 7.1 - 7.3 | 21.25 + 21.45 8 (A 1 3 CHASSIS MOUNTED COMPONENTS R1801 10K, 5%, Reverse Log Taper C1805 10, 5%, N330 C1811 10, 5%, N220 SW1802 Dim Swatch R1802 100 Ohm, 10%, | Watt C1806 5. 5%, N470 C1812 5, 5%, N330 11801 VFO Coil C1801 22, 5%, N330 C1807 9pf Trimmer 1813 9 pf Trimmer 1.1802 VFO Coal C1802 1 pf Dial Set C1808 10, 5% NPO C1814 10, 5%, N220 1.1803 VFO Coil C1803 5-12 Tunning Capacitor C1809 5, 5%, N150 C1815 5, 5%, N150 L1804 VFO Coil C1804 9 pf Trimmer C1810 9 pf Trimmer EWIBOL Range Switch FIG.18 SCHEMATIC DIAGRAM, MODEL 406B FREQUENCY CONTROL UNIT 30 KILOCYCLES SWAN MODEL 410 FREQUENCY CONTROL UNIT Model 410 Frequency Control Unit is designed for full coverage of 80, 40, 20, 15 and 10 meters. The unit is specifically intended for fixed station operating and matches the 350 in height, depth, and styling. CIRCUIT THEORY Q1, the 2N706 Oscillator operates in the common base configuration, as a Colpitts oscillator. See Figure 6. Capacitors C1801, C2001, and C2003 effectively tap the oscillator across only about 10 percent of the tank circuit. This results in excep- tional stability. Q2, the Emitter Follower, is used for matching the impedance of the coaxial cable to the transceiver, as well as for isolation. The band- switch selects the appropriate coil and trimmer for each range. Dial tracking is adjusted with the coil and trimmer. ALIGNMENT Alignment of the Model 410 requires only the use of a general coverage receiver tuning the frequency ranges between 8 mc and 24 mc. Calibration of the receiver is not critical since the crystal calibrator in the transceiver is used for final adjustment but the receiver must be accurate within 50kc to permit selection of the proper 100 kc harmonic. FOR MINOR FREQUENCY ADJUSTMENTS, which may be required after the initial aging period, simply remove the cabinet cover and very carefully adjust the trimmer capacitor marked for the specific range. FOR MAJOR FREQUENCY ADJUSTMENTS Tune Frequency Control Unit to low end of fre- quency range, and locate heterodyne with general coverage receiver at frequency indicated in the fol- lowing table. Adjust vernier coil to bring heterodyne within a few kc of the receiver frequency, then switch on calibrator and adjust vernier coil for zero beat with calibrator at 100 kc increment of dial. Move tuning to high end of tuning range and adjust trim- mer capacitor for zero beat. Repeat high and low end adjustments until calibration is correct at both ends. Coil and capacitor locations are marked in the unit. 410 OSC. ADJUST | ADJUST FREQ. FREQ. COIL CAP. RANGE (kc) (Low end) | (High end) 3.5— 4.0 | 8,673— 9,173 L1801 C1805 7.0— 7.5]12,173—12,673 L1802 C1807 14.0— 14.5 | 8,827— 9,327 L1803 C1809 21.0— 21.5 |15,827 — 16,327 L1804 C1811 28.0— 28.5 | 22,827 — 23,327 L1805 C1813 28.5 — 29.0 123,327 — 23,827 L1806 C1815 29.0 — 29.5 123,827 — 24,327 1,1807 C1817 29.2 — 29.7 | 24,027 — 24,527 L1808 C1819 31 CIRCUIT BOARD MOUNTED COMPONENTS C1801-22 C2001-270 C2004-27 po vd Ë " - PE y a IL - R2001 IK, 5%, 1/2 Watt C2001 270, 2%, Silver Mica TX LAY Q2 2N706 R2002 1K, 5%, 1/2 Watt C2002 .0015 Ceramic Disc 2N706 R2003 1K, 5%, 1/2 Watt C2003 430, 2%, Silver Mica R2004 470, 5%, 1/2 Watt C2004 27, 5%, Silver Mica R2005 2.7K, 10%, 1/2 Watt C2005 430, 5%, Silver Mica R2006 2.7K, 10%, 1/2 Watt C2006 .0l Ceramic Disc C2005-430 — R2007 470, 5%, 1/2 Watt L2001 200 UH RFC 3 > > м x > a x E a 5 5 = es 7 = O i iS 1 1 1 ses: 3 $ 3 Ss 8 o o > > © o o a a ~ N Non a e ~ a = = m о = = = d— | — С2006-.01 Fe == Bho - | — - - Ака À : vv vVv т = ¡ OPTIONAL == ; ! ! 1 С1818-15 1 C1804-10 —— + ! — RF. GAIN & _ { C1819-9 C1805-9 | R1901-10K S r i 11808 gd 00000 3 - I 1.1 801 «ео 1 в 3 1 inn _ ‘| ‚5 - 4.0 C1934-.01 29.6 - 9.7 ı C1816-15 ! C1806-30 ' 6 — = = | C1817-9 ! C1807-9 Y ; I — -_ Г} - Ч 1.1807 4 ) 11802 7.0 - 7,5 — 29.0 - 29,5 - PL1902- #756 C1814-15 C1808-5 >—dt I N — b > С1815-9 h C1809-9 - o 1 , L1806 ф= ! 1.1803 || 1 L $wisol RANGE SELECTOR > J ee 14.0 44,5 — ¿8,5 - 29,0 C1812-25 с 59 1810- IL —i [€ P1901 | C1813-9 с1811-9 1 1.1805 4 Фи } 1.1804 ei «фа E ¿1.0 - 21.5 —— 28.0 - 28,5 1 — FREQ. RANGE: 1. 3,5 - 4.0 5, 28.0 - 28.5 - o MC. 2, 7.0- 7.5 6. 28.5 - 29.0 3. 14,0 -14.5 7. 29.0 - 29.5 4. 21.0 21.5 8. 29,2 - 29,7 FIG. 19 MODEL 410 VARIABLE FREQUENCY OSCILLATOR (9. Additional Range, Optional) 32 © SWAN MARK I GROUNDED GRID LINEAR AMPLIFIER 2000 Watt PEP Input, 80 through 10 meters... Swan again provides the ultimate in equipment design at a reasonable cost. The new MARK | Linear Amplifier uses two EIMAC 3-400Z or Amperex 8163 zero bias triodes in grounded grid circuit for con- servative maximum legal input rating. Power switch reduces input to 1 KW dc input rating for CW and tune-up. Untuned input circuit provides maximum operating ease, fastest QSY capability. Built-in 2500 volt, solid state 117/220 volt AC supply is designed for extended trouble-free operation. New final tube cooling concept guarantees long tube fife and reduces initial equipment cost. Dual changeover relays provide automatic barefoot or linear operation as desired. Wide range pi-output network allows use with variety of antenna systems without need for external matching networks. Designed by hams for hams, MARK | provides all necessary features for complete HF band operation. Metering of Grid current, Plate current, Plate voltage, and relative output, allows monitoring of all essential parameters and maximum ease in tune up. Again Swan leads the field with maximum quality and dollar value SPECIFICATIONS Computer grade electrolytics provide 40 Two Eimac 3-400Z zero bias triodes in mfd. filter capacity for exceptional dy- grounded grid circuit. namic regulation. 2000 watts P.E.P. input, 1000 watts CW * Ceramic insulation on all tuning capaci- and tune input. tors, RF switches and Tela | Drive requirements 100 watts. Built-in solid state 2500 volt power Wide range pi output. supoly for 117 or 230 volts, 50-60 cycle Includes changeover relay. Approx. weight 55 Ibs. Dimensions: 19” x 844” x 1544". * * * + + Covers amateur bands 10 through 80 meters. » + + *+ » # CAUTION: NEVER REMOVE CABINET OR BOTTOM PLATE WHEN POWER LINE VOLTAGE IS CON- NECTED. HIGHLY LETHAL VOLTAGE § IS USED IN THIS AMPLIFIER. AL- LOW AT LEAST ONE MINUTE FOR CAPACITORS TO DISCHARGE AFTER TURNING THE AMPLIFIER OFF AND PULLING THE PLUG. ESE ESS EET ET EET ES ST SE TTS ES "vr INSTALLATION (a) Remove the cabinet, and install a pair of Eimac 3-400Z tubes. (b) Connect a short length of coaxial cable (RG-58 or RGB8) from the transceiver or exciter to the input jack on the Mark I. This cable should be as short as practical, and preferably not more than 5 feet long. NOTE: Swamping the exciter or driver power with an attenuator is not normally required with drivers up to 400 watt PEP input rating. After proper tuning pro- cedures have been followed, the Mic. Gain con- trol will be used to set the level of drive. If the driver is called on for less than its maximum power, distortion products will be less, and over- all performance improved. (c) Connect a 2 conductor line from auxiliary switching contacts on the driver to the Relay Control jack on the Mark I. When using the Swan-240, 350, or 400 as a driver, the 2 con- ductors connect to "C" and "T" terminals on back of the transceiver. (d) Connect the antenna coax. or dummy load to the output jack. If a low-pass filter is to be installed to reduce TVI, connect it between the output jack and the antenna. (e) Connect a ground lead to the Mark I chassis. A water pipe or ground rod will be suitable. (f) Power Line Connections— The Mark I is shipped from the factory for 230 volts opera- tion The white and black power cord wires go to 230 volts, with the green wire going to neutral-center, (ground). A plug is not supplied because of the many different types being used. To operate from a 117 volt source, remove the bottom cover and find the 4 screw terminal strip located near the power transformer. Re- move the jumper wire which connects the two center screws, B and C. Connect a jumper wire from A to B and another jumper wire from C to D. Refer to the schematic for clarification. Then connect the white and black power cord wires to 117 volts, and the green wire to ground. Finally, remove the 20 amp. line fuses, and replace with 30 amp. fuses. NOTE: When the Mark I is used with 117 volts, current drain will exceed most outlet ratings, particularly in OPERATE position. It may be necessary to use only the TUNE-CW position, which will reduce 34 power input, but will keep circuit breakers from kicking out. If it is necessary to operate with 117 volts try to run the Mark I on a separate circuit, and if possible, on the opposite side of the primary house circuit from the side used for the rest of the station. Always use 230 volts for the Mark I, when possible. TUNING INSTRUCTIONS 1 — Always tune the exciter or transceiver first, with the Mark I turned OFF. Exciter output will be by-passed around the linear amplifier by the internal relay, and will go to whatever antenna or load is connected. The " Output” position of the Mark I meter circuit will indicate exciter output, and may be used conveniently as a tuning meter. Simply adjust the exciter controls for maximum output, using whatever tuning procedure is prescribed for the particular exciter. Then switch the exciter to standby or receive. 2— Turn the Mark I to the ON position and allow several seconds for filament warm up. Leave the Meter switch in " Output" position. Set the Function Switch to TUNE-CW position. The green " Standby" light will be on, and the 3-400Z tube filaments will be lit brightly. The tubes are biased to cut-off in standby position, so IP and IG will read zero. EP will read approxi- mately 1600 volts, depending on line voltage. 3 — Switch the exciter to TRANSMIT position, but with Mic. Gain turned down, and the carrier balanced out, so there is no R. F. output. (With the Swan 350 transceiver this is done by press- ing the push-to-talk button). The Mark I will now be switched to TRANSMIT mode by the closing of the auxiliary contacts, and the red indicator light will come on. The 3-400Z tubes will now be drawing idling current, so IP will read approximately .1 amperes and EP approx- imately 1500 volts. IG should still read zero. 4 — Switch the Exciter to its "TUNE" position, and quickly adjust P.A. TUNE on the Mark I for maximum output. Then go back to the Exciter and adjust its P.A. TUNE for maximum output. (It may have changed slightly when switched into the Mark I). ¡Next, adjust P.A. LOAD on the Mark I for maximum output, and then alternate between adjusting P.A. TUNE and P.A. LOAD until maximum output is reached. Set the Output Level Control as re- quired to keep the meter from going off scale. The output reading is a relative indication, only. CAUTION: DO NOT KEEP THE EXCITER OR TRANSCEIVER IN TUNE POSITION FOR LONGER THAN 30 SECONDS AT A TIME. This caution note concerns the exciter more than the Mark I, but since the power amplifiers are operating at full input during tune, the time should always be kept short. If longer time is required, switch to standby for a minute, and then back to TUNE for 30 seconds. With experience in tuning procedures, it will be found that 30 seconds is more than enough time. 5 — After tuning all controls for maximum out- put indication as described, other meter readings may be observed. IG (grid current) should indicate .2 to .5 amperes in TUNE position, depending on the amount of driving power. Swan transceivers will generally supply more driving power than others presently on the mar- ket. However, most transceivers will provide enough to drive the Mark I to full legal power. IP (plate current) should indicate between .6 and .8 amperes (see paragraph 9). The exact values of grid and plate current are not critical provid- ing they do not exceed .6 grid amperes, and .8 plate amperes, and this only during short dura- tion tuning periods. 6 — To operate with SSB voice modulation, switch the Mark I to" OPERATE" position, and apply excitation with the driver, using the MIC. GAIN control directly as a power control. IMPORTANT: Once tuning procedures have been completed, set the meter switch to IP, and using average plate current as an indication of proper power level, set the Mic. Gain control for an average reading of .35 amperes. Only oc- casional voice peaks should kick to .5 amperes. Peak envelope power input will be at the legal limit of 2000 watts under these tuning condi- tions. CAUTION: Exercise care in setting the Mic. Gain control. Too high a setting will produce higher meter readings, but flat-topping and spurious emissions will result, as well as the possibility of exceeding legal power limits. dl te WARRANTY POLICY SWAN ELECTRONICS CORPORATION WARRANTS THIS EQUIPMENT A- GAINST DEFECTS IN MATERIAL OR WORKMANSHIP, EXCEPT FOR TUBES, TRANSISTORS, AND DIODES, UNDER NORMAL SERVICE FOR A PERIOD OF ONE YEAR FROM DATE OF ORIGINAL PURCHASE. THIS WARRANTY IS VALID ONLY IF THE ENCLOSED CARD IS PROPERLY FILLED IN AND MAILED TO THE FACTORY WITHIN TEN DAYS OF DATE OF PURCHASE. DO NOT SHIP TO THE FACTORY WITHOUT PRIOR AUTHORIZATION. THIS WARRANTY IS LIMITED TO REPAIRING OR REPLACING ONLY THE DEFECTIVE PARTS, AND IS NOT VALID IF THE EQUIPMENT HAS BEEN TAMPERED WITH, MISUSEDOR DAMAGED. * > Y e Y Y E E Y De SD DDD DY Y SD DD Y $ Y YD + - "TT ST Y DS ED E ES DS E YAA A UC UE чт CE CR CE UE CE CE ES LA a # Ц ¢ 4 La Г Ц + / Ц + La Г + | О + Ц О Г 4 ¢ Г Г ’ # ¢ | # + | О + ¢ 7— When the Mark I Function Switch is in OPERATE position for SSB voice transmission, plate voltage is increased from the CW-TUNE value. In Standby or Receive condition, the 3-400Z tubes are biased to cut-off, so IP will be zero, and EP will indicate 2900 volts. In TRANSMIT position, without modulation, IP will show an idling current of .18 amperes, and EP will drop to 2650 volts. With voice modu- lation averaging .35 amperes, EP will drop to about 2500 volts. Occasional voice syllables may drop the plate voltage further, but with proper setting of the Mic. Gain control, dynamic regulation of the internal power supply is more than adequate, Use of computer grade electro- lytics assures long capacitor life, and a net capacity of 40 mfd. across the plate supply. (Voltage readings are subject to line voltage variations). 8 — To operate without the Merk I Linear Am- plifier, simply switch it to "OFF". The antenna circuit is then by-passed around the amplifier by the internal relay and the transceiver-driver will operate " Barefoot". 9— To operate on CW-always keep the Func- tion Switch in the TUNE-CW position in order to limit input power to 1000 watts. CAUTION: Because the Mark I uses a grounded grid am- plifier circuit, input power measurements must include the driver stage input. Thus, if the driver is running 300 watts input, the linear amplifier input must be limited to 700 watts when in CW mode. Thus, you must first meas- ure driver input, in order to determine how much input you may run to the Mark I. Use the EP meter position to measure plate voltage, and then calculate how much IP (plate current) you can run and stay within the legal limit. Then use the P.A. Load control to hold IP down to this level. NOTE: It is quite possible to run well in excess of the legal power limit on CW as well as SSB with the Mark I. The design of an amplifier with linear characteristics up to the legal límit results in this capabil- ity. The burden of operating within legal limits falls on the operator and Swan Elec- tronics Corporation is not responsible for improper or illegal operation. Every well informed operator should be familiar with measurement procedures, and with mathe- matical calculations of power level. When- ever possible, an oscilloscope should be used to monitor peak power levels, since ordinary meters are unable to do so. 35 БО OHM COAX, TO TRANSCEIVER OR EXCITER > (117 v) 150 YAc |, Y 0047 0047 1 L И mo | 150 vAC — 5 „001-5 KV 5 Tr \ о, уг 500-25 Y + WHITE GREEN BLACK | D sl la if «К G | 230 OR 117 VOLTS 50-60 CYCLES SINGLE PHASE | OPERATE 200 РУ ТА RELAY CONTROL 001-5 KY = 50-72 OHM COAX. TO 3 ANTENNA NS e Y > = ‘ о — , , ‘ U + u e } Lea 1-1 KV 9 .001- 6KY .001- T u 99) y | 4 1230 a = + 2500, OPERATE POSITION, — pd YOICE MODULATION. +1300, TUNE POSITION, EY DOWN. KEY DOWN INGO > = уч Y г. pt + == ne т 1 < > <” > = + > (+ 1? + > + X x + » z 2 + < X ~ oe TT = + + Tr 23 x = > Ke ” MI Sn М DE: > ©! 1 3! O 2 1 < > Y 5 — < о — = 2 ОР 1K P _ —— в 608 6 tA EP CAL. — ib Ki FIG. 20 SWAN MARK I LINEAR a AMPLIFIER BACK OF SWAN ELECTRONICS CORP. R € YT SWAN-240, OCEANSIDE, CALIF. 9 € © 350 OR 400 © 2 CoND. 8-16-65 on (A ) (B) (C (D (E So” — — SWAN MODEL RC-2 KIT For use in trunk mount installations of Model 350/400 SSB Transceiver The RC-2 Kit includes the cables and plugs which will generally be required for trunk mount- ing the Swan-350 or 400. Sinceeachinstallation is different, none of the cables are pre-wired or stripped. Study the schematic diagram carefully. The small cabinet which comes with the kit is for mounting the Mic. Jack and On-Off switch, and attaches to the bottom of the Model 406B mobile VFO. Simply remove the appropriate screws from the bottom, and use them to secure the cabinet to the bottom. 22 feet of 3-conductor (1 shielded) cable is pro- vided for extending the microphone and push- to-talk circuit from the 350/400 to the new Mic. Jack. Another 22 foot length of cable with black vinyl jacket will be found, containing a 6-conductor cable and a coaxial R.F cable. This group goes to the 9 pin plugs, as illustrated. The third cable has a total length of 30 feet, and runs from the 12 pin Jones plug at the 350/400 up to the engine compartment, or hood where the D.C. power supply is mounted close to the battery. A breakout at 22 feet carries the 2-conductor voice coil leads to the speaker, and the #8 filament line from the ON-OFF switch. The speaker leads may be wired to thecar radio speaker located in the dash of the car. If this speaker must also be used with the regular car radio, a DPDT switch will be required. A more convenient suggestion is to connect the car radio to a rear seat speaker leaving the front speaker always connected to the transceiver. Note: To disablethe speaker in the 400, remove the bottom cover and clip out thejumper going from Pin 11 to Pin 12 on the Jones connector. This does not actually have to be done, since the400 has plenty of audio power, (F) The 12 volt Filament Supply line runs from (G — the ON-OFF switch through an in-line 9 amp. fuse, to the accessory circuit of the ignition key. If the accessory terminal can be found con- veniently, connect to it. Otherwise, locate the car radio fuse, and tap in on the hot side of it, since this will be on the accessory circuit. It is im- portant to connect the filament line to the acces- sory circuit, because this will make certain that the D.C. supply is turned off when the ignition key is turned for starting the engine. The transient voltage spikes from the starter motor are a serious hazard to the power supply trans- istors. A small field strength meter mounted on the dash is strongly recommended for monitoring transmitter output. This will give the best in- dication that you are radiating normally. If an extension meter on the transceiver is desired it may be tapped into the Pin 4 circuit of the VFO plug, as illustrated. A standard 0-1 ma. movement will be satisfactory, or you may write to the factory for purchasing a duplicate meter. (H) The method for installing the 350 or 400 in the trunk is left up to the individual. If 75 meter operation is expected. and the antenna will be mounted on the back part of the car, it will be best to mount the transceiver so that the P.A. tune control can be reached with the trunk lid almost closed, with just enough gap to reach through for final adjustment. Otherwise, the trunk lid may detune the antenna considerably. 37 ON-OFF SWITCH FIG. 21 TO 12 VOLTS, MIC. JACK IGNITION SWITCH, | ACCESSORY _- CIRCUIT. te ad Q AMP, /\ SHIELDEP WIRE MN REMOTE TRUNK MOUNT KIT, MODEL RC-2 SWAN ELECTRONICS TRUNK COMPARTMENT A 3 CIRCUIT = Mic. PLUG K—RED (BLACK NOT USED) | LL по To 350/400 TRANSCEIVER | FT 9 PIN ‚=> GREEN ELDEN # 8446 BROWN : MALE PLUS 0 22 FT., BELD 1 5 9 PIN (RED NOT USE | é où T0 350/40 SOCKET (PLUG WHITE ©) (9PIN SOCKET No’ TER COAX, MUST BE ADDED Ax. y SEL | Æ 21-6907 Cox” TEM 7 - ‘= = TO 350 $ ct ST TT 93 Fr, HF 21-597 COAX. 75 04M A A OUTER 9 q e SEE Po. 28 М = — = — — МИ о о - SALELD . VO PIT = = — AND Pg. 21) 4 — — BLACK BLUE | > Y ont 20 FT. BELDEN | oo te EXTERNAL J 7) «< GREEN +275 T7 ~ .+8446 - Ta 3 - a " i 1 ! | | OTHERWISE, “2 с 3 «RED +800 — — Zl iio 12 PIN CONNECT DIRECT. pe (De —BROWN RELAY CONTROL, o | JONES E ho | O » 7| PLVG 1 WHITE — то SPEAKER, a O UN т . T° 350/400 OR SPKRASWITCH. > oy BLACK o | ‘ 1 ' y 2016 O BLUE NOT USED Ye ! Ny я 4 NA Aa Y + 2 COND. SPKR, LEAD, 22 FT. BELDEN 4 8787 3 2 1 FIL. LINE, 22 FT. #8 COND. A Eo 38 +275 wl ut y ? q of ? 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Key features
- Single Sideband Transceiver
- Crystal Lattice Filter
- Adjustable Microphone Gain
- Carrier Balance Control
- Pi-network Output
- VFO Oscillator
Frequently asked questions
Single Sideband, Suppressed Carrier: 400 watts, PEP, minimum on all bands.
Audio output, 4 watts to 3.2 ohm load.
Less than 0.5 microvolt at 50 ohms impedance for signal-plus-noise to noise ratio of 10 db.
Rec-Tune-CW, AF Gain, Mic. Gain, Bandswitch, Carrier Balance, PA Plate Tune, PA Grid Tune, PA Load Coarse, PA Load Fine, VOX-PTT Switch, Dial Set, RF Gain.
Any of the common antenna systems designed for use on the high frequency amateur bands may be used with the Swan transceiver, provided the input impedance of the transmission line is not outside the capability of the pi-output matching network.