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INSTRUCTION MANUAL
JERR~tD
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435-374.2
1--1 /\..NNEL
IVI
DER
IVIN
MODEL COM-*
FIG.
1-MODELCOM-12
Converts
anyTVChannel
2-13,including12,to TVChannel
12
DESCRIPTION
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The Jerrold Channel Commander Model COM-*
is a unitized head-end for completely processing
any vhf channel (2-13).Channel Commanders process the signals in such a way that adjacent channels
on both high and low bands can be fed to the
distribution system thus providing a completelycontrolled, compact head-end for up to 12 vhf
channels.
VIDEO IF AGC (intermediate frequency amplifier
and automatic gain controD, SOUND IF AFC (automatic frequency and sound controD, and a Standby
Carrier Oscillator. Model CCV-*, the crystal-controlled converter/amplifier, the fifth plug-in module,
provides the particular output channel desired.
ModelCOM-* is compatible with existing system
equipment and may be used to supply an additional
vhf channel, to replace obsolete equipment, or as
a spare head-end for any vhf channel. Modular
construction of the unit makes it possible to change
the output channel simply by exchanging the
crystal-controlled converter module. Hence, only
additional converter units are required to provide
spares for different channels.
The basic unit comprises a main chassis with a
built-in power supply and five modules: Tuner,
1
4
3
1
1
1
1
1
CONTENTSOF PACKAGE
Carton No.1
Model COM-* Ser. No. ...................
Screws
Male Connectors Model F-59A
Spare Model PIP-* Plug-in Pad
Warranty Card 435-258
Carton No.2
Unit Model CCV-*
Unit LPF-50 (Channels 4, 5, and 6 only)
6" Cable (Channels 4, 5, and 6 only)
1
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STANDBY
CARRIER
OSCILLATOR
MODELSR-*
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VIDEO IF AGC
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LOW-PASSFILTER
MODEL LPF-50
(
SOUNDIF AFC
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FIG.2-MODELCOM.*ANDITSMODULES
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SPECIFICATIONS
OVERALL
Sensitivity
100uv (-20 dbj)* input for 57 dbj output
Maximum::!:::
V2 db output change for input change of 200 uv (-14 dbj)
to 64,000uv (+36 dbj)
AGCSensitivity
TUNER
Frequency
Range
INPUT:
VHFChannels
2 to 13(onespareposition)
"
NoiseFigure
Impedance
Gain
MaximumInput
"
"
"
"
Image
Rejection
AFC
OUTPUT:
41 mc to 47 mc
6 db Max.
75.ohminput- 75-ohmoutput,at VSWR1.1:1
17 db minimuru
+36 dbj
.
50 db minimum
Pull.inRangeof ::!:::250
kc minimum
VIDEO IF AMP & AGC
Bandwidth
IFResponse
Flatness
VideoCarrier
SoundCarrier
"
AdjacentCarrierRejection
GainControl
Impedance
Gain
:
Operational
IF Output
AGC
41.6mc to 46.5mc
Within 1f4db
45.75mc
41.25mc
50 db minimum
Manualor automatic
75-ohminput (VSWR1.2:1);75-ohmoutput(VSWR1.2:1)
46 db minimum
VideoIF Carrier40 dbj; SoundIF Carrier25 dbj
SyncTip Referenced,
noiseimmune
SOUND IF AMP & AGC
SoundIF frequency
41.25 mc
SoundIFLimiting
10 db limiting min. (ii) 25 dbj outputwith 100uv input to tuner
75 ohmsat VSWR1.1:1
4.473mc
25 mv rms across100 k ohms,2% harmonicdistortion
Sound
IFOutput""""""""""""""""
AFCIF
AFCAudio
STANDBY
CARRIER OSCILLATOR
Delay(Off)"""""""""""""""""""""
20 sec.al1\)roximate
Delay(On)
Range """"""""""""""""""""""""
2 sec.
.
Adjusted to operate at Station-Off-AirCondition
Input """"'
Output
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:
Impedance
""""""""""""""""""""
InsertionLoss""""""""""""""""""
Outputof IF amplifier
45.75mc carrier adjustableand Xtal-controlled
- 1.12:1
75.ohminput VSWR=1.12:1;75-ohm
outputVSWR
1/2 db maximum
CONVERTER/ AMPLIFIER
Frequency
range
Input Impedance
OutputImpedance
Gain
MinimumInput"""""""""""""""""
input:41 mcto 47 mc;output;anysingleVHFChannel2 to 13
75 ohlJ1s,
VSWR1.2:1
Dual/75ohms,VSWR1.2:1
17 db minimum
43 dbj
MaximumOutput
Oscillator
57 dbj
(1) self-containedcrystal controlled;
(2) tuner oscillator controlled for on-channeloperation
Model PIP
GainControl
POWER SUPPLY
Type
Self-containedwith line voltage regulating transformer
PowerRequirements
""""""""""""
90 v to 130v, 60 cps, no watts
'0 dbj
= 1000
microvolts across 75 ohms.
3
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TECHNICALDESCRIPTION
POWER SUPPLY
action at relatively low intermediate frequencies to
control the on-channel sound carrier. Once set, the
desired difference between sound and video carrier
levels for the channel is precisely maintained.
A line-regulating supply powers all modules. Additional voltage regulation is provided for stable
operation of AFC and AGC circuits.
STANDBY CARRIER OSCILLATOR
TUNER
When a station goes off the air, a time delay
device is automatically energized and triggers a
crysta I-controlled oscillator to provide a replacement carrier after 20 seconds. A warning light indicates that the station is off-the-air.
The tuner will receive any vhf channel according
to the position of the channel selector switch. The
tuning control circuitry incorporates a balance
meter which gives visual indication that the tuner
is set to the exact frequency. The automatic frequency control insures that the tuner will remain
locked-in precisely on frequency. A special AGC
circuit maintains the best possible noise figure on
weak antenna signals and prevents overloading on
strong (up to 64,000 microvolts) signals. Finally,
the tuner amplifies and changes the received signals to relatively low intermediate frequencies.
CRYSTAL CONTROLLED
CONVERTER/ AMPLIFIER
The converter uses a crystal-controlled oscillator
to change the intermediate frequencies to any desired TV channel output. In the event that onchannel conversion (e.g., Ch. 2 to 2, 9 to 9, etc.) is
desi red, the converter oscilIator is switched out
of the circuit to permit the tuner oscillator to be
used for both down and up conversion. Since the
same oscillator is now used for both conversions,
co-channel interference cannot be generated internally. The converted signal is fed via an amplifier
stage to dual outputs with an output capability of
one volt each. These dual outputs have an excellent
match (VSWR 1.2:1) simplifying mixing with other
COM-* units or other existing equipment.
VIDEO IF AGC
The highly-selective i-f amplifier incorporates
specially-designed traps and filters to eliminate
adjacent channel interference. This circuitry assures
minimum phase delay for the best reproduction of
the incoming color and black and white signals.
Sync pulse reference AGC has a noise clipping
circuit which provides constant output levels not
affected by power line or ignition noises. The fast
action of this AGC minimizes airplane flutter.
LOW-PASS FILTER
SOUND IF AFC
For channel 4, 5 and 6 conversion, a special lowpass filter network (Model LPF-50) is shipped with
the converter unit. The network is designed to
suppress 82.5 mc second harmonics generated in
the sound i-f module.
The automatic frequency control circuitry provides the correction voltage for the tuner. Precise
automatic sound control circuitry provides limiting
;>Q..
AFC
OUTPUT
SOUND IF
OUTPUT
Ase
AFC
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AUDIO IF
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TUN~R
IF
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SOUND 8 VIDEO
I F OUTPUTS
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STANDBY
AGC
CARRIER
UP
CONVERTER
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OSCILLATOR
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FIG. 3-FUNCTIONAl BLOCKDIAGRAM
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INSTAllATION
A. INSTALLATION OF LOW-PASS-FILTERMODEL LPF-50
FOR CONVERSION OF CHANNELS 4, 5, AND 6
2. Units in the same rack should have 5 to 7 inches of~vertical spacing between them for proper ventilation and
ease of servicing.
For conversion of channels 4, 5 or 6, a low-pass filter is
required to be installed in Models COM-4,5, or 6. The filter
is shipped with each Model CCV-4,CCV-5and CCV-6respectively.
3. Channel Commanders can be used with any 75-ohm antenna arrays or other 75-ohm source such as preamplifiers
(e.g., Model TPR-*).
1. Mount Model LPF-50on top of the COM-*chassis, in the
4. As output mixing determines the arrangement in the relay
racks, we shall discuss this matter first.
area bounded by the power transformer, the electrolytic
capacitor, and the SOUND IF AFC module. Mount the
LPF-50 so that the silkscreened label is adjacent to the
SOUND IF AFC module. Two snap plugs are provided for
fastening through 1f4"holes stamped out in the chassis
(see fig. 2).
2. Disconnect the jumper from the J204 SOUND IF OUT,
fitting on the SOUND IF AFC module; then connect the
jumper to the LPF-50 fitting near tube VIOL
"
3. A 6" jumper is shipped with each LPF-50. Connect this
jumper between J204 SOUND IF OUT fitting on the
SOUND IF AFC module and the LPF-50 fitting near the
transformer.
B. INSTALLATIONOF MODELCCV FOR OFF-CHANNEL
CONVERSION(ch. 2 to ch. 3, etc.)
'\
1. Mount Model CCV at rear of chassis (compare fig. 2) so
that its plug engages the chassis-mounted socket; turn
spring lock fasteners 90° clockwise.
2. Connect orange-coded cable from IF OUT fitting on standby carrier oscillator module to J502 IF IN fitting on
Model CCV.
3. Removecap from J506 RF T.P: fitting on Model CCVand
connect the blue-coded jumper in its stead.
4. Connect brown-coded jumpers to J504 RF OUT 1 and
J505 RF OUT 2 fittings on Model CCV.
5. Disconnect and remove the grey-coded jumper from the
OSC OUT fitting on the tuner. Cover the fitting with the
cap removed in step 3.
6. Set OSCILLATORINT EXT switch on Model CCV to INT
position.
C. INSTALLATION
OF MODELCCV FOR ON-CHANNEL
CONVERSION(ch. 2 to ch. 2, etc.)
'1'1
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1. For channels 4, 5 and 6 install Model LPF-50 as under A.
2. / Install Model CCVas under B steps 1 to 4.
3. Remove cap from J501 OSC IN fitting on Model CCV;
connect grey-coded jumper to J501.
4. Set OSCILLATORINT EXTswitch on CCVto EXT position.
D. INSTALLINGTHE CHANNELCOMMANDER
GENERAL
1. Mounting of Channel Commanders in standard 19" relay
racks should be done so that most convenient mixing of
their outputs can be effected. ~e double-shielded...£~
for construction of mixing iump-els; Jumper lengths are
non-critical. In many cases the RF OUT terminal bracket
c;n b~ved
and connections be made directly to the
fittings on the CCVchassis.
OUTPUT CONNECTION
1. Mixingthe output of a single COM-* unit with outputs of
compatible equipment (such as Model DPM-*): connect
the RF OUT fittings at chassis rear of the COM-* in the
same manner as the outputs of a single-channel amplifier.
2. Mixing the outputs of several COM-*units: mixing should
be done separately for low-band and high-band channels.
Non-adjacent channels in each band can be mixed directly; so can two adjacent channels in either band. Where
more than two channels in the low-band or the high-band
are to be mixed, mix non-adjacent channels directly in
two groups and combine both groups in a mixer such as
Model 1592.The mixed low-band and the mixed high-band
can then be combined in a further network such as Model
LHS-76 to obtain an all-band, single trunk line input.
3. Mixing should be done with the signal flow directed from
the lowest channel unit to the highest channel unit in
each group, terminating unused output terminals in the
lowest channel units with Models TR-72F (see block
diagram).
4. After mounting the COM-* units according to the above
criteria, measure the lengths of mixing jumpers that will
be required, construct the jumpers and interconnect the
COM-* units.
INPUT CONNECTION
1. At the end of each antenna down lead install an F-59A
connector, as described in Jerrold instruction book
435-345.Where other than RG-59/U type cable is used,
install appropriate adapter fittings.
2. With a Jerrold Field Strength Meter measure the signal
strength at the end of each down lead; record the readh.
"
ings for future reference.
c;.4 ~(:;o-""'-IV
The max. input level should not exceed +36 dbj as
specified. The input level measured at channel 6
should not exceed 1000 uv; this is important for proper
color reception! )
b. If signal strength is less than 100 uv (-20 dbj), install
a mast-mounting preamplifier Model TPR-* for the
particular channel.
c. If signal strength measured on channel 6 is more than
1000 uv (0 dbj), connect an in-line attenuation pad
Model PDL** and an F-71adapter (or a short RG-59/U
jumper equipped with F-59Afittings) to the end of the
down lead to reduce the signal to approximately 0 dbj.
3. Connect each down lead to the ANT INPUT fitting at the
rear apron of the respective COM-*unit.
**Available for 3, 6, 10 and 20 db.
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OPERATIONALPROCEDURE
GENERAL
NOTE: Each COM-* has been factory-equipped with plugin pads of proper value (Models PIP-3, 6, etc.) to
provide a video carrier level of 57 :t 1 dbj and a
sound carrier level of 42 :t 1 dbj at each RF OUT
terminal.
This step-by-step procedure should be followed for each
COM-* unit installed. A level-setting example for a COM-* system is given, with a Model TML-1 as the first amplifier, and
with JT-1750 type cable used in the trunk line.
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1. Plug line cord of COM-* into 117 vac outlet.
EXAMPLE OF A COM-* SYSTEM
2. Set POWER switch to ON position.
3. Set GAIN SELECT switch to AGC position.
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4. Set AFC ON switch to down (off) position.
I
5. Set small knob of tuner selector switch with white dot to
the off-the-air channel assigned to COM-* installed.
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Slowly tune the fine tuning control (large knob) on the
channel selector to obtain zero indication on the AFC
BALANCE meter; there should be a decided plus and'
minus indication about the zero point during tuning.
NOTE: The tuner oscillator may possibly convert a strong
but undesired adjacent video carrier to 41.25 mc.
To find out whether the unit is properly tuned
to the desired channel, connect a tv receiver to
the TEST fitting on the front panel. If a good
clear picture shows, the unit is tuned properly.
If a faded or distorted picture shows, retune the
unit.
7. Set AFC ON switch to ON position.
8. If the COM-* is installed for operating an additional
channel, or replacing a single-channel amplifier, use a
Jerrold Field Strength Meter for measuring the signal
strength of the video and sound r-f carriers of the particular channel at the trunk line input; then set the
output to the desired level at the new channel, or to the
same level as that of the previous unit.
1. Systems normally require a flat output from the first
repeater amplifier. As cable characteristics
vary with
frequency, this requires UtiIting" the output of the headend (or trunk Iine input)
.
2. Let us assume a typical 9-channel head-end using
COM-2, 3, 4, 5, 6, 7, 9, 11 and 13; the low-band groups
(channels 2, 4, 6) are mixed (with 3 & 5) in a Model 1592
with a loss of 3 db; the low-band is mixed with the highband in a Model LHS-76 with" a loss of 0.5 db; a directional coupler (Model DC-12) is used for introducing a
permanent test point incurring a max. loss of 1 db;
the first repeater amplifier is a Model TML-1 with a
recommended input level of +8 dbj and is equalized for
22 db of cable (both at ch. 13). See block diagram.
3. a. Operating the COM-13 at maximum output of 57 dbj
at ch. 13 to achieve longest possible cable run to the
TML-1, we calculate: 57 less losses in: (a) LHS-76,
(b) DC-12, and (c) less input to TML-1 = 57
(0.5 + 1.0 + 8) = 47.5 db.
-
b. Using Jt-1750 type cable, having a nominal attenuation of 1.03 dbllOO ft. at channel 13 and at a mean
temperature of 70°F, we can achieve a cable run of
4"'i.~ 100 = 4,610ft.
CHANNEL COMMANDERS
('
TR-72F
TR-72F
TR -72 F
I
47.5db=4.610
of JT-1750
L
Block Diagram~Typical
6
FT
+ 8 dbj INPUT(at
Ch.13 )
g.Channel Head-End With JT-1150Tr.unk
and TML.1 first Repeater Amplifier
c. The chart below gives the nominal attenuation per
100 ft. of JT-1750 cable, at 700F, for each video carrier.
ch. 2
ch. 3
ch.4
ch. 5
ch. 6
ch.7
0.49 db
0.52 db
0.54 db
..0.58 db
" .0.60 db
, .0.89 db
ch.8
ch. 9
ch.10
ch. 11
ch. 12
ch. 13
0.92 db
..0.95 db
.0.98 db
". ..1.00 db
..1.02 db
.1.03 db
We can thus calculate the attenuation for each of our
video carriers in our cable of 4,610 ft.; at channel 2
.
. 0.49x 4,610
db
the attenuation IS
100
=. 225 ,
and for all channels in our system:
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ch.
ch.
ch.
ch.
ch.
2
3
4
5
6
22.5 db
..24.0 db
.25.0 db
..26.5 db
.27.5 db
ch.
ch.
ch.
ch.
7
9
11
13
.41.0 db
..44.0 db
.46.0 db
.47.5 dl;>
d. Our TML-1 being equalized for 22 db = 2,140 ft.
JT-1750 cable at ch. 13 and requiring an input
+ 8 dbj, we calculate the TML-1 input levels for
video carriers in our system; for ch. 2 the level
'
22 + 8 0.49x 2,140 - 195 db
100
-.
j,
and for all channels in our system:
j,,
r
ch.
ch.
ch.
ch.
ch.
Iii
2
3 ..."
4
5 """'"
6 ..."
19.5 dbj
.19.0 dbj
..18.5 dbj
.17.5 dbj
.17.0 dbj
ch.7
ch.9
ch. 11
ch. 13
of
of
all
is
11 dbj
.10 dbj
9 dbj
8 dbj
II
..42.0 dbj
..43.0 dbj
43.5 dbj
44.0 dbj
..44.5 dbj
.39.0 dbj
.40.0 dbj
.40.5 dbj
ch. 5
ch. 6
.41.0 dbj
41.5 dbj
Inserting an appropriate PDL after the low-band mixer
(Model 1592) will operate the individual COM-* units
near optimum rated output.
4. Measure the level of each video carrier at the trunk line
input. Adjust the front panel AGC control to come as
close as possible to the level arrived at in 3 e and f
respectively. If necessary exchange the PIP plug-in pad
on the CCV-* module for one of higher attenuation. Then
record the trunk line input levels for future reference.
NOTE: Our example gives approximate level settings before total system alignment begins. In modern
installation practice, with 2-way voice communication facilities
available, the fastest and most
accurate way of level setting is to fine.-adjust the
individual
COM-* units following
instructions
given by an observer reading the output levels at
the first trunk line ampl ifier.
5. Check each COM-* for internally
rier signal:
generated standby-car-
a. Disconnect the antenna input-lead from the COM-*;
after about 20 seconds the SIGNAL OFF indicator on
COM-* front panel should light up. If the time interval
is too short, slightly adjust the SEN (sensitivity) control clockwise and repeat test. If the time interval is
too long, sl ightly adjust the control counter-clockwise
and repeat test. For this test, the COM-* should have
been in operation at least 1 hour.
b. Adjust OSC LEVEL control on standby-carrier
e. Adding the figures derived in d to those in c, we get
the levels required at the trunk line input in our
example:
ch. 2
ch. 3
ch. 4
ch.5
ch. 6
ch. 2
ch. 3
ch. 4
ch. 7
ch.9
ch. 11
ch. 13
..52.0 dbj
54.0 dbj
..55.0 dbj
.55.5 dbj
f. Operating the TML-1 with block-tilt of 3 db in the
low-band, we can set our low-band channels to the
foliowing trunk line input levels:
oscillator of each COM-* to obtain the same output level
as recorded under 4.
c. Reconnect antenna lead; SIGNAL OFF indicator
should go off in about 2 seconds.
light
d. If the Iight does not go. off in about 2 seconds, slowly
advance the SEN control on the standby-carrier module clockwise until light goes off. Then repeat steps
5 a to c.
6. After all operation checks have been made, wrenchtighten all jumper connectors not more than 1/6 of a
turn.
MAINTENANCE
MODULE
II
II
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REPLACEMENT
Model COM-* is designed to give long, trouble-free service.
Its modular construction permits quick replacement of a
sub-assembly with a spare at the infrequent times when
servicing becomes necessary. Down-time of the channel involved during replacement is kept to not more than a minute
or two.
II
rf
II
For multi-channel systems Jerrold recommends the following
spare equipment:
II
1. One complete COM unit less CCV module.
2. One CCV module for each channel in operation.
II
TUBE REPLACEMENT
II
,
Replacement tubes must be of the same type as specified in
the parts list. After tube replacement, check the output levels
and compare the readings with those previously recorded.
If tube replacement requires re-alignment of a module, follow
the alignment procedures given here. If lack of test equipment prevents proper alignment in the field, send the subassembly to the factory while keeping the channel in operation with the spare equipment. Carefully pack the module
and ship it, with freight and insurance charges prepaid, to
Jerrold's Service Department. Include a letter quoting the
channel involved and Iisting the difficulties encountered.
ALIGNMENT
PROCEDURES
A. EQUIPMENT REQUIRED
1. Sweep Generator-Jerrold
Models 601, 890, 900A.
2. Oscilloscope-Commercial
type with 5" screen, calibrated
vertical amplifier.
3. Detector-Jerrold
Model D-86.
4. Two Attenuators-Jerrold
Model AV-75.
5. VTVM-Commercial type with high input impedance.
6. Field Strength Meter-Jerrold
Model 704-8.
7
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7. Marker Generator-Jerrold Model CM-6,for oscillator frequencies of 39.75mc, 41.25mc, 41.6mc, 45.75mc, 46.5mc,
and 47.25 mc.
8. Marker Generator-Variable type, Weston or RCA.
9. Band Filter-Jerrold Model FCO-47.
10. Attenuation Pad-Jerrold
3. Place jig Model AJ-106over tube V304in video i-f module.
4. Connect a 6 db pad to J303; terminate J304 with a Model
TR-72F.Connect sweep output to AJ-106,and FCO-47input
to the 6 db pad.
5. Observe response and adjust L317 and L318 for flatness
from 41 to 47 mc.
Model PDL-6.
11. Low-capacity Probe-10:1 Divider type.
12. 75-ohm Termination-Jerrold Model TR-72F.
6. Energize Model COM-*;allow 5 minutes warm-up.
7. Transfer AJ-106from V304to V303.
13. Jig Shield-Jerrold
8. Set GAIN SELECT switch to MAN position; set MANgain
control at minimum (maximum counter-clockwise position).
Model AJ-1O6.
14. RF-Bridge-Jerrold Model KSB-7F (fixed 75 ohms).
15. Coaxial Switch-Jerrold Model FD-30 or TC-3.
16. Spare Amplifier-Jerrold
9. Adjust n04 and R316 for maximum attenuation at 41.25
mc.
Model TML-1or SCA-2l3.
10. Adjust L312, L315, and L316 for response shown in fig. 5.
17. -3.5 volt bias supply.
B. TUNERALIGNMENT
L316
1. Set up equipment as shown in fig. 4.
2. Set power switch on COM-*front panel to POWERON
45.75
\".
position and allow 5 minutes warm-up.
3. Set AFC ON switch to off position (down); set GAlN
SELECT switch to MAN position.
4. Tune sweep generator to the mid-frequency of the channel
concerned; set marker generator to provide markers at the
video and sound carrier frequencies of the channel
concerned.
5. Observe the oscilloscope for flatness and band-pass;
adjust C12 and Cl3 for flat response (::tl/2 db), with video
and sound carriers on top of the curve.
C. VIDEOI-F ALIGNMENT
Fig.5-Response Curve (L312,315, and 316 adjustment)
The video i-f stage should not ordinarily require alignment in
the field, even after tube replacement. However, in case of
emergency and where a spare unit is not available, proceed
as follows:
1. Ascertain that Model COM-*is de-energized.
2. Set up test equipment as shown in fig. 4.
11. Connect a VTVMto test point TP30land adjust MANgain
control for a reading of -3.0 volts.
12. Transfer AJ-106 from V303 to V302; adjust n03 for maximum attenuation at 47.25 mc; be sure this trap is on
frequency before aligning this interstage. Now adjust
e
RF
AV-75
SWEEP
GEN. MKR.
M
47.25
41.25
MKR.
GEN.
0
0
Fig. 4-Test Set-up
8
V
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L308 and L311 for the response shown in fig. 6; then
recheck the trap frequency and, if necessary, readjust
the bandpass circuit. Remove AJ-106.
41.6
t
L311
46.5
L308
L
MAX. % DB
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13. Connect sweep input to IF IN terminal J301; adjust C306
for maximum attenuation at 39.75 mc; adjust C308 for
maximum attenuation at 47.25 mc.
-!\
.1.
14. Adjust n01, n02 and L307 for response shown in fig. 7.
Continuously monitor the trap frequencies while aligning
this interstage. It may be necessary to touch-up the other
stages to achieve an overall flatness of ::!: 1f4 db. DO NOT
adjust L301, L302 and L303 in the input stage, nor L317,
L318 and L320 in the output stage!
47.25
41.25
Fig.6-Response Curve(l308 and 311 adjustment)
D. SOUND (-F ALIGNMENT
With COM-* in operating condition
channel:
tuned to the assigned
41.6
45.75
t
f
46.5
1. Disconnect the jumper at the IF IN terminal J301 on the
VIDEO IF AGC module.
V4 DB
MAX.
2. Connect an AV-75 attenuator to that terminal; connect a
CM-6 generator, capable of delivering a 41.25 and a
45.75mc signal, to the AV-75.
3. Connect a field strength meter to one RF OUT terminal
at the rear apron of the COM-*.
4. Turn SOUND LEVEL control maximum clockwise.
5. Tune the field strength meter for maximum indication of
sound carrier level for the assigned channel. Attenuate
the input signal to J301 sufficiently to stay below limiting
level.
6. Now adjust T203 and T204 for maximum output; then
turn SOUND LEVEL control maximum counter-clockwise
and adjust n04 and R316 on the VIDEO IF AGC chassis
for maximum attenuation at the sound carrier.
7. Connect a VTVM to test point TP201 on the SOUND IF
AFC chassis and adjust
L201 for
maximum
negative
C306
41.25
T301
47.25
C308
Fig.7-Response Curve(T301and302 andl307 adjustment!
9. Nowadjust C221 and top and bottom of T202 for response
curve shown in fig. 8; keep the sweep input to a level so
as to maintain a 2-volt deflection on the oscilloscope; the
flat portion of the curve should vary not more than 0.2
volts (approx. 1 db).
voltage. Then back up the adjustment 1/2 turn counterclockwise.
8. Disconnect VTVM; connect a low-capacity probe in its
stead; connect the other side of the probe via a D-86
detector to an oscilloscope; insert a sweep generator
between the marker generator and the AV-75; set sweep
for 40.5 to 42 mc. This set-up is similar to that in fig. 4.
10. Disconnect probe from TP201; remove D-86; connect probe
directly between AUDIO output terminal J201 and oscilloscope.
11. Now adjust top and bottom of T201 for response curve
shown in fig. 9; adjust for maximum ampl itude with equal
displacement above and below the base line.
2 Volts
Fig. 8-Response Curve(C221andT202adjustment)
Fig. 9-Response Curve(T201adjustment)
~
I;
9
-" rt
E. CLIPPING LEVEL ALIGNMENT
2. Terminate IF IN terminal J502 with a TR-72F.
With COM-* in operating condition, tuned to the assigned
3. Set OSCILLATOR switch to INT position.
channel:
1. Connect a field strength meter to one RF OUT terminal
at rear apron of chassis; terminate the other RF OUT
terminal with a TR-72F.
2. Tune the field strength meter to the video carrier of the
assigned channel; set GAIN SELECT switch to AGC; set
AGC potentiometer for 57 dbj output.
3. Connect an oscilloscope to TP302; loosen the locking nut
on CLIPPING LEVEL control R338; adjust R338 until the
sync tips just begin to compress. Observe the reading on
the field strength meter and back off R338 for a reduction
of 2 db.
4. Reset AGC potentiometer for 57 dbj output; tighten the
locking nut on R338.
4. Adjust L501 for peak value; peak L504. For low-band
channels adjust C534, for high-balld channels adjust
C503, to indicate -3.9 volts. Then reset L501 for -3.5
volts on the slow side. This will generally yield maximum conversion gain. Gain will deviate 1 db with a
bias variation from -2.5 to -5.0 volts.
c) Alignment
With COM-'k in operating condition, tuned to the assigned
channel:
1. Connect field strength meter to one RF OUT terminal;
terminate the other RF OUT terminal with a TR-72F; tune
the meter to the video carrier of the assigned channel.
2. Turn OSC LEVEL control maximum clockwise; disconnect
antenna; SIGNAL OFF indicator on front panel should
light up after approx. 20 seconds. If not, carry out step 5
of operational procedure to check time delay circuit.
3. Now adjust L401 for maximum output reading on field
strength meter; then back up L401 for 2 db on the slow
side of the peak.
4. Adjust OSC LEVEL control for 57 dbj output.
for on-channel operation:
1. Carry out steps 1 and 2 as under b.
2. Interconnect OSC OUT terminal on tuner and OSC IN
terminal J501on CCVby coaxial jumper.
3. Set OSCILLATORswitch to EXT position.
4. Adjust C506 (accessible through hole in chassis, near
J501) for -3.5 volt bias.
d) Alignment
F. STANDBY-CARRIER OSCILLATOR ALIGNMENT
of oscillator
of oscillator
1. Set up equipment
circuit.
response:
as in fig. 4 but omit FCO-47 from
2. Terminate RF OUT 1 terminal J504 with a TR-72F; set
OSCILLATOR switch to INT position.
3. Checking the output at J505, adjust L506, L507, L510
and L511 to yield a response as shown in fig. 10 (see
note).
4. Terminate the RF OUT 2 terminal J505; check the
response at J504; if it is tilted, adjust the response at
J505 to give a min. flatness of V2 db. Minimum gain
should be 17 db, maximum gain should be 23 db.
5. On low-channel (particularly ch. 2, 3 and 4) converters,
L506 and L507 may have to be detuned sl ightly to yield
the desired response, since the coupling capacitor
C512 has a fixed value.
G. CONVERTER ALIGNMENT
With COM-*
channel:
in
operating
condition,
tuned
to
assigned
a) Alignment for input match:
1. Set OSCILLATOR switch to EXT position.
2. Apply a -3.5-volt bias to feed-through capacitor C512
located between V503 and L505 on the CCV chassis.
3. Where the originally supplied PIP plug-in pad has been
replaced with one of different attenuation value, reinsert the original PIP into socket J503.
4. Set up test equipment for JERROLD STANDARD
MATCH TEST as described in Jerrold Technical Newsletter Vol. 2, No.1, fig. 14a; connect the "U NKNOWN"
terminal of the bridge to the IF IN terminal J502 on
the CCV.
NOTE:
The overall i-f band of interest is 41 to 47 mc. The
COM-* actually shapes this to the required band of
41.25 to 46.25 mc. Therefore the CCV can be aligned to
a flat-top at maximum bandwidth or to one at minimum
bandwidth. The bandwidth is established by the tolerances of C515, C516, R516, and by tube characteristics.
e) Oscillator
output match:
1. Set OSCILLATOR switch to EXT position; terminate one
of the RF OUT terminals with a TR-72F.
CAUTION:
2. Set up equipment for JERROLD STANDARD MATCH
TEST; check match at unterminated RF OUT terminal.
Adjust C521, C522, L512 and L528 to yield a 15 db return
loss within the band and 20 db return loss outside the
band.
Due to presence of second harmonics, the sweep generator may give erroneous return loss measurements.
In such cases insertion of an FCO-47 filter in the output
line of the sweep generator is recommended.
3. Terminate the other RF OUT terminal and check the
former for symmetry; adjust L512 and L528 if necessary.
Both these coils govern the symmetry of match at the
two RF OUT terminals.
5. Tune the top and bottom slugs of L505 to yield the best
input match in the i-f band of 41 to 47 mc; a minimum
return loss of 20 db should be achieved.
b) Alignment of oscillator
1. Remove -3.5-volt
C512.
10
6. On high-channel units (particularly ch. 11, 12 and 13)
the outer poles can be sharpened by very slightly
increasing the inductance of L509. This adjustment is
very critical! Too much inductance of L509 may mismatch the output!
for off-channel operation:
bias from C512; connect
VTVM to
4. Recheck both response (with OSCILLATOR switch set
to INT) and match (with OSCILLATOR switch set to
EXT).
~
L506
L507
L510
L511
Y20B MAX.
47
41
46,5
r
MAXIMUM
BANDWIDTH
MINIMUM
CCY
BANDWIDTH
RESPONSE
Fig. 10-CCV Response
CIRCUIT DESCRIPTION
POWER SUPPLY (compare
fig.
11)
The built-in power supply operates on 90-130 vac, 60 cps. It
employs a line-regulating transformer n01, silicon rectifiers
CR1O1, CR1O2 and CR103, a filter network, and a voltage
regulating tube VIOL The power supply provides positive and
negative 150vdc voltages and 6.3 vac.
Except for the tuner, all modules are powered and connected
to operating controls via plugs and sockets. The tuner is
powered via a 6-conductor cable.
TUNER (compare
fig.
12)
The tuner is a modified Standard-Kollsman unit. It has a
13-position selector switch with a coaxially mounted finetuning vernier capable of tuning each channel individually.
The tuner accepts any vhf tv channel at its ANT IN terminal
and converts the particular channel to a preselected intermediate frequency band of 41 to 47 mc. This is accomplished
in an r-f amplifier stage (VI) and an oscillator-mixer stage
(V2). For best oscillator stability, the tuner incorporates an
automatic frequency control circuit. The required correcting
voltage is supplied by the SOUND IF AFC module. A varactor
diode CR1 connected between oscillator plate and grid varies
in capacitance according to variations of the impressed
voltage. Hence, as the oscillator frequency tends to shift, the
voltage changes and, therefore, the capacitance changes and
returns the oscillator frequency to its original value. The i-f
b1md is passed via IF OUT terminal to the VIDEO IF AGC
module.
For on-channel operation of the COM-*, the tuner osci lIator
replaces the oscillator in the CCV module. This maintains
station frequency assignments and prevents co-channel interference in systems.
VIDEO I-F AMPLIFIER AND AGC (compare fig.
13)
This module accepts the i-f band from the tuner with the
video carrier at 45.75 mc, the sound carrier at 41.25 mc, and
the color sub-carrier at 42.17 mc. Special traps reject frequencies outside the band of interest with particular emphasis on the adjacent video carrier of 39.75 mc, the adjacent
sound carrier at 47.25 mc, and the adjacent color sub-carrier
at 48.17 mc.
The signal enters at the IF IN terminal J301. The input is
matched to 75 ohms for the 41-47 mc band by loading the
grid of V301 with R301 and transforming the resultant grid
load to 75 ohms in a double-tuned, optimum-coupled, bandpass circuit. This network consists of C301, L301, L302 and
L303.
The first interstage V301-V302 is a double-tuned, undercoupled band-pass circuit. Primary tuning is on nOl which
also incorporates the trap for the adjacent video carrier.
L307 controls the bandwidth and n02 provides secondary
tuning. n02 also incorporates the trap for the adjacent color
sub-carrier.
The second interstage V302-V303is a double-tuned, optimumcoupled band-pass circuit with primary tuning by L308 and
secondary tuning by L31l. C312 and n03 form the top-end
coupling circuit with n03 acting as trap for the adjacent
sound carrier.
11
"'
II
II
Ii'
"
1
1
"
Ii,,,
E. CLIPPINGLEVELALIGNMENT
2. Terminate IF IN terminal J502 with a TR-72F.
With COM-* in operating condition,
channel:
1.
Connect
a field
strength
meter
tuned to the assigned
to one
at rear apron of chassis; terminate
terminal with a TR-72F.
RF OUT terminal
the other RF OUT
'
2. Tune the field strength meter to the video carrier of the
assigned channel; set GAIN SELECT switch to AGC; set
AGC potentiometer for 57 dbj output.
3. Connect an oscilloscope to TP302; loosen the locking nut
on CLIPPING LEVEL control R338; adjust R338 until the
sync tips just begin to compress. Observe the reading on
the field strength meter and back off R338 for a reduction
of 2 db.
4. Reset AGC potentiometer for 57 dbj output; tighten the
locking nut on R338.
4. Adjust L50l for peak value; peak L504. For low-band
channels adjust C534, for high-band channels adjust
C503, to indicate -3.9 volts. Then reset L50l for -3.5
volts on the slow side. This will generally yield maximum conversion gain. Gain will deviate 1 db with a
bias variation from -2.5 to -5.0 volts.
c) Alignment
tuned to the assigned
1. Connect field strength meter to one RF OUT terminal;
terminate the other RF OUT terminal with a TR-72F; tune
the meter to the video carrier of the assigned channel.
2. Turn OSC LEVEL control maximum clockwise; disconnect
antenna; SIGNAL OFF indicator on front panel should
light up after approx. 20 seconds. If not, carry out step 5
of operational procedure to check time delay circuit.
3. Now adjust L401 for maximum output reading on field
strength meter; then back up L401 for 2 db on the slow
side of the peak.
4. Adjust OSC LEVEL control for 57 dbj output.
of oscillator
for on-channel operation:
1. Carry out steps 1 and 2 as under b.
2. Interconnect OSC OUT terminal on tuner and OSC IN
terminal J50l on CCV by coaxial jumper.
3. Set OSCILLATOR switch to EXT position.
4. Adjust C506 (accessible through hole in chassis, near
J50l) for -3.5 volt bias.
d) Alignment
F. STANDBY-CARRIER OSCILLATOR ALIGNMENT
With COM-* in operating condition,
channel:
3. Set OSCILLATOR switch to INT position.
of oscillator
1. Set up equipment
circuit.
response:
as in fig. 4 but omit FCO-47 from
2. Terminate RF OUT 1 terminal J504 with a TR-72F; set
OSCILLATOR switch to INT position.
3. Checking the output at J505, adjust L506, L507, L510
and L511 to yield a response as shown in fig. 10 (see
note).
4. Terminate the RF OUT 2 terminal J505; check the
response at J504; if it is tilted, adjust the response at
J505 to give a min. flatness of 112db. Minimum gain
should be 17 db, maximum gain should be 23 db.
5. On low-channel (particularly ch. 2, 3 and 4) converters,
L506 and L507 may have to be detuned sl ightly to yield
the desired response, since the coupl ing capacitor
C512 has a fixed value.
G. CONVERTER ALIGNMENT
With COM-* in
channel:
operating
condition,
tuned
to
assigned
a) Alignment for input match:
1. Set OSCILLATOR switch to EXT position.
2. Apply a -3.5-volt bias to feed-through capacitor C512
located between V503 and L505 on the CCV chassis.
3. Where the originally supplied PIP plug-in pad has been
replaced with one of different attenuation value, reinsert the original PIP into socket J503.
4. Set up test equipment for JERROLD STANDARD
MATCH TEST as described in Jerrold Technical Newsletter Vol. 2, No.1, fig. 14a; connect the "UNKNOWN"
terminal of the bridge to the IF IN terminal J502 on
the CCV.
output match:
1. Set OSCILLATOR switch to EXT position; terminate one
of the RF OUT terminals with a TR-72F.
Due to presence of second harmonics, the sweep generator may give erroneous return loss measurements.
In such cases insertion of an FCO-47filter in the output
line of the sweep generator is recommended.
3. Terminate the other RF OUT terminal and check the
former for symmetry; adjust L512 and L528 if necessary.
Both these coils govern the symmetry of match at the
two RF OUT terminals.
1. Remove -3.5-volt
C512.
,~
e) Oscillator
CAUTION:
b) Alignment of oscillator for off-channel operation:
....
NOTE:
The overall i-f band of interest is 41 to 47 mc. The
COM-* actually shapes this to the required band of
41.25 to 46.25 mc. Therefore the CCV can be aligned to
a flat-top at maximum bandwidth or to one at minimum
bandwidth. The bandwidth is established by the tolerances of C515, C516, R516, and by tube characteristics.
2. Set up equipment for JERROLD STANDARD MATCH
TEST; check match at unterminated RF OUT terminal.
Adjust C521, C522, L512 and L528 to yield a 15 db return
loss within the band and 20 db return loss outside the
band.
5. Tune the top and bottom slugs of L505 to yield the best
input match in the i-f band of 41 to 47 mc; a minimum
return loss of 20 db should be achieved.
10
6. On high-channel units (particularly ch. 11, 12 and 13)
the outer poles can be sharpened by very slightly
increasing the inductance of L509. This adjustment is
very critical! Too much inductance of L509 may mismatch the output!
bias from C512; connect VTVM to
4. Recheck both response (with OSCILLATOR switch set
to INT) and match (with OSCILLATOR switch set to
EXT).
The third interstage V303-V304 is a triple-tuned,
optimum-
coupled
t
I,
band-pass circuit with primary tuning by L312, midtuning by L315,and secondary tuning by L316. C345 a[1d n04
form the top-end coupling circuit in the primary section;
C322 provides coupling in the secondary section. n04 has
two functions: (1) provides the i-f sound input via SOU ND
OUT J302 terminal to the SOUND IF AFC module; (2) acts as
trap for the accompanying sound, preventing it from appearing at the video i-f output terminals J303 and J304, Factoryadjusted potentiometer R316 is set for maximum attenuation
of the sound trap.
The output of V304 is double-tuned flat across the i-f band
and
is transformed
into two 75-ohm
loads.
Backmatch
is
The plate output of V203 passes through a single-tuned interstage (T203) and is coupled by C217 to the grid of the
second sound ampl ifier V204. The plate of V204 is singletuned by T204 and coupled through C224 to the grid of the
sound limiter V205. R220 back-matches the plate output of
V205 to provide the proper source impedance at the SOUND
IF OUT terminal J204. SOUND LEVEL potentiometer RI08,
mounted
of the limiter normally to 25 dbj. From J204 the signal is
returned either directly, or through the low-pass filter LPF-50,
to the VIDEO IF AGC module.
peaks the plate output of V305A to the video i-f carrier. The
signal is then passed to the series-connected
linear detector
V305B; its negative-going output is passed to the grid of
V306 arranged in a combination dc amplifier and limiter
circuit. The plate output of V306 is applied to two silicon
diodes in a shunt-series
circuit. The shunt diode is referenced to a selected negative voltage developed across R329.
This circuit yields excellent noise limiting and clipping at
sync tip level.
The signal then passes to the second dc amplifier V307A, a
cathode follower with a short time constant effected by R332
and C338. The positive-going output is then appl ied to the
final dc ampl ifier V301B which develops
AGC voltage across a relatively low load.
the negative-going
This AGC bias is applied to two separate control areas:
(1) directly to the i-f amplifier control grids (V301,V302and
V303):(2)indirectlyto the tuner r-f amplifier control grid (VI).
The circuit design for (2) is based on the following:
For any antenna signal other than that which would require
maximum gain, the AGC amplifier will develop negative
bias. This would then reduce the gain of VI and increase
the noise figure of the tuner, which is not desirable at low
r-f antenna signal levels.
A "bucking voltage" circuit RUI and RU5 has therefore been
incorporated in the power supply chassis. This circuit determines the point at which AGC bias will be applied to the
grid of VI. At low r-f signal levels, RI09 and RUO establish
the required minimum grid bias for VI. Clamp CRI04 prevents
positive voltage excursions. At high r-f signal levels, AGC bias
is applied to VI at twice the rate of that applied to the i-f
amplifier: this prevents overloading VI and considerably
extends the dynamic range of the tuner without degrading
its characteristics under weak signal level conditions.
For automatic
gain control, the threshold
of the video carrier
output level is adjustable by AGC potentiometer RU9 which
references the cathode of V305A to ground.
For manual gain control the GAIN SELECT switch S102 appiies control bias to R333 and R334 via MAN potentiometer
RU2.
The cathode of V307B is referenced to negative bias via R337,
R338 and R339. Potentiometer R338 serves to position sync
tips at or near clipping level. Grid control bias can be monitored at TP-301: clipping level can be monitored at TP-302.
12
r
i-f amplifier
for combining
The automatic gain control circuit operates as follows: C326
lightly couples the plate of V304 to the grid of V305A.L323
~
and is applied to the grids of the first sound
V203 and the afc buffer amplifier V202B.
accompl ished by network L320, C328 and C329. J303 is used
the video i-f carrier with the sound i-f carrier
processed in the SOUND IF AFC module, either directly or
through the low-pass filter unit LPF-50. J304 transmits the
combined video and sound i-f carriers to the standby-carrier
oscillator module.
,
'I
SOUND I-F AND AFC (see fig. 14)
This module receives the sound i-f carrier from the VIDEO
IF AGC module. The signal enters at the J203 IF IN terminal
on the front
panel,
serves
to set the output
level
The plate of the buffer amplifier V202Bis peaked by C221to
41.25 mc. This signal is then applied, together with the
36.777 mc output of the crystal-controlled oscillator V201A,
to the grid of mixer V202A.The plate of V202Ais tuned by
T202to the difference frequency of 4.473mc. This signal is
then passed to the IF AFC limiter V201B.The sound output
is brought out to two terminals: AUDIOOUTPUTJ201 and
AFC OUTPUTJ202. The former is used for monitoring, the
latter is connected to a filter network in the power supply
chassis. The filter serves to remove the audio components
from the afc correcting voltage. AFC BALANCEmeter Ml
serves to monitor the correcting voltage, which is then appi ied through AFC ON switch S1O3 to the varactor diode
circuit in the tuner.
The use of a 4.473 mc afc intermediate frequency instead of
the 4.5mc standard is based on the followingconsiderations:
At the IF IN terminal we have a very low level 45.75mc carrier.
This produces a low level 4.5 mc carrier at the output of the
mixer V202A.This carrier in turn would generate an interfering
beat with the desired 4.5 mc carrier produced by conversion
of the 41.25 mc. By off-setting the afc carrier from 4.5 mc to
4.473 mc, a 27 kc beat is generated which is outside the
audible range. The resultant dc component of the undesired
4.5 mc carrier is negligible.
STANDBY-CARRIER OSCILLATOR (see fig. 15)
The function of this unit is to provide a video i-f carrier
signal for routine maintenance and servicing during stationoff periods. The circuit consists of a crystal-controlled oscillator activated by a tube-controlledreed relay.
The signal from the VIDEO IF AGCmodule enters at the
IF IN terminal J401 and is applied to contacts on relay K401.
Relay action is controlled by tube V401Bwhich samples the
grid bias voltage through R407. The level of this voltage is
set by the chassis-mounted SEN (sensitivity) control R409.
V401Bis arranged in a delay circuit employingnetwork C405,
R404and R405between grid and plate, with the B+ voltage
maintaining a charge on C405. In normal (station-on) condition, V401Bdoes not conduct and K401 contacts are held
"open" to pass the signal via an artificial 75-ohm line to the
IF OUTterminal J402.
In station-off condition the grid bias on V401B approaches
zero and V401B conducts. The delay circuit effects a time
delay of approximately 20 seconds, after which the relay will
become energized. The IF IN terminal J401 becomes disconnected and B+ is applied to the crystal-controlled oscillator V401A,which produces a 45.75 mc signal. This output is
then coupled through C403 to the IF OUT terminal J402. The
level of this output is adjustable by OSCLEVELcontrol R403.
Simultaneously, B+ is applied to a SIGNAL OFF warning
light OS101 on the front panel. The relay also disconnects
the delay circuit at V401Bso that with the return of station
signal and therefore grid bias at V401B,the relay will become
de-energized within 2 seconds. With B+ cut off from the
oscillator V401A, the plate circuit L401, C403, detunes to
appear outside the i-f band of interest.
CONVERTER (see fig. 16 and
.
'J
J
17)
It is the function of the converter to convert the incoming
i-f band to the desired vhf channel. The i-f video and sound
carriers from the output of the standby-carrier unit enters
the converter at the IF IN terminal J502. Input match to
75 ohms is achieved by loading the grid of the mixer stage
V503with R507and transformingthe resultant grid load with
L505and C511.Coarse input level adjustment is provided by
a plug-in pad accessible on the chassis top. The signal is'
then applied to the grid of the mixer stage V503.
For off-channel conversion (ch. 2 to 3, etc.) with OSCILLATOR
switch C501 in INT position, a crystal-controlled oscillator
V501generates a signal (see crystal frequencies tabulated on
schematics) which is coupled through C503to the grid of a
doubler or buffer amplifier stage V502.The plate of V502 is
tuned by L504to the required converter frequency. For lowchannel conversion the oscillator operates at the fundamental frequencyand the output of V502is tuned to the same
fundamental frequency. For high-channel conversion the
oscillator operates at a preselected frequency and the output
of V502 is tuned to the second harmonic of the oscillator
frequency. This signal is then coupled through C510to the
mixer V503.
For on-channel conversion (ch. 2 to ch. 2, etc.) with OSCILLATOR switch SW501 in EXT position, B+ is disconnected
from V501and the OSC IN terminal J501 is connected to the
buffer amplifier V502. In this case the oscillator signal is
obtained via a jumper cable from the OSC OUT terminal on
the tuner.
This technique prevents beat interference between the vhf
channel as picked off the air and the same vhf channel
assigned to the COM-*in the system.
The mixer injection voltage of V503as developed across R508
can be monitored at the tip of feed-through capacitor C512
located on the CCVchassis between V503and L505.A doubletun~l'!d,over-coupled band-pass circuit couples the output of
the mixer to the grid of the output stage V504.Primary tuning
is by L506; C515 controls the bandwidth, and secondary tuning is by L507. C516 serves to decouple the low-impedance
grid of V504 from L507. L509 raises the resultant input impedance at the grid of V504.
The plate output of V504 is single-tuned to mid-frequency
by L510with loading adjustment by L511.The plate circuit is
back-matched by an LCR network to permit mixing of semiadjacent converters. The output works into two 75-ohm loads
at RF OUT terminals J504 and J505. An r-f test point RF T.P.
J506, attenuated by 40 db from the actual r-f output signal,
is connected by a coaxial jumper to the TEST terminal on
the COM-*front panel.
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13
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Fig.
0861-479-8
"
CAPACITOR
VALUES ARE IN PF.
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ULL UNMARKEO CAPACITOR" 1000PF
'ALL CAPACITOR VALUE' GIVEN IN PF UNLESS OTNERWISE 'PEClF~O
4 CR'OI a CRZO' ARE A MATCHEO PA<R OF 'N'4I,OREOUIVALENT
TO IN 54'.
Fig.14-Sound and AFC Schematic
E861-477-
0
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,--
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4'
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C402
1000
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I
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50 K-2W
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6
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R409
lOOK
2W
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150V
FILAMENT
V401
6DJ8
cr:
GROUND
NDTES
I. ALL RESISTOR VALUES GIVEN IN OHMS,1/2WATT, 5%,UNLESS
OTHERWISE SPECIFIED.
2.ALL CAPACITORVALUES GIVEN IN PF UNLESS OTHERWISE
SPECIFIED.
Fig. 15-StandbyCarrierOscillatorSchematic
D861-478-C
......
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I
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"ALL RESISTORS II. WATT, 10% UNLESS OTHERWISESPECIFIED,
.,ACL CAPACITORSIN PF, UNLESS OTHERWISESPECIFIEO.
>ALL UNMARKEDCAPACITORS' 1000 PF,
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Fig. 17-Model CCV(HighChannels)Schematic
t-'
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r
CONVERTERAMPLIFIERMODEL CCV-6, SERIES2
Series 2 of this converter (used in converting the i-f of the
Whenever replacement of a channel 6 converter is intended,
Model CCV-6 SERIES 2 should be ordered. Effective from
June 1, 1965, the modified converter will be supplied as
standard for orders specifying Model COM-6.
Channel Commander to distribution channel 6) represents
a modified version of Model CCV-6 designed for improved
processing of color signals.
~~
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REPLACEMENT
PARTSLIST REF.DWG.NO.:
E861-475
ASSEMBLY:
MAINCHASSIS
ANDPOWERSUPPLY
SCHEMATIC
ITEM DESIGNATION
=.
1
2
3
4
5
6
7
8
9
10
CAPACITORS
C1O2
JERROLO
PARTNO.
1
M1O1
13
CR1O1,102,
103
CR1O4
1
2
127-600
127-024
127-007
125-008
125-002
124-029
3
0.001 mfd, cerafnicdisc
1.0 mfd, 200 v
123-115
125-019
4
1
1
OMNIGLOW
1O1A1
GE# 328
102-504
102-004
1
H-Kbalance
171-212
3
silicon, 750 ma, 800 piv
137-711
1
silicon, 750 ma, 400 piv
RECTIFIERS
12
SCHEMATIC
ITEM DESIGNATION QTY.
150 + 150 mfd, 250 v,
dual electrolytic
10 mfd, 250 v, electrolytic
60 mfd, 250 v, electrolytic
0.25 mfd, 200 v
0.1 mfd, 200 v
0.005 mfd, ceramic disc
METER
11
5
6
7
8
9
10
11
12
13
14
15
16
RESISTORS
I
1
"II
I
R1O1,102
R1O4
R1O5
R1O6
R1O7
R1O8
R1O9
Rllo
R111
R112,124
R113
R114
R115
R116
R117
R119
R121,125
R122
R123
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
100 ohms,10 W,w.w.
2 k, 10 w, w.w.
470 ohms,2 w, 10%
330 ohms,1 w, 10%
12 k, 1 w, 10%
50 k, 2 w, potentiometer
820 ohms,1/2w, 5%
91 k, 1/2w, 5%
15 megohms,1/2w, 5%
10 k, 2 w, potentiometer
130 k, l/2 w, 5%
1 k, l/2 w, 5%
470 k, 1/2w, 5%
20 k, l/2 w, 5%
270 k, 1/2w, 5%
5 k, 2 w, potentiometer
1 megohm,1/2w, 5%
82 k, 1/2w, 5%
10 ohms, l/2 w, 5%
113-017
113-007
112-322
112-300
112-501
118-024
112-350
112-608
112-884
118-026
112-629
112-359
112-695
112-524
112-665
118-023
112-737
112-602
112-107
2
1
SPST,toggle
DPDT,toggle
162-001
162-008
1
Sola MC, line transformer
141-109
SWITCHES
33
34
S1O1,103
S1O2
34
n01
TRANSFORMER
TUBE
35
V1O1
DESCRIPTION
JERROLD
PARTNO.
1
OA2,voltage regulator
22 pfd
1000 pfd
121-015
123-115
1000 pfd, feed-thru
129-200
1
2
1
1
1
1
1
1
1
2
1
1
0.75-0.95pfd, trimmer
HFT-65A
100 pfd
3 pfd
2.7 pfd
1.0 pfd
43 pfd
43 pfd, silver mica
47 pfd, silver mica
0.5 mfd, 200 v
20 pfd
3300 pfd
2 mfd
0.01 mfd
821-141
123-105
121-065
121-040
121-058
121-023
126-054
126-068
125-050
121-014
124-026
125-040
124-031
4
coaxial, F-61A
2
tip jacks
185-104
2
silicon, 750 ma, 400 piv
137-712
1
4
1600 ohms, 1/2w, 5%
180 ohms, l/2 w, 5%
112-389
112-266
2
3
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
4
100ohms,1/2 w,5%
10 ohms,1/2w, 5%
15 k, 1/2w, 5%
3900 ohms, 1/2w, 5%
91 ohms, l/2 w, 5%
2700 ohms,l/2 w, 5%
2200 ohms,l/2 w, 5%
330 ohms, 1/2w, 5%
1.0 k, potentiometer
5600 ohms, l/2 w, 5%
1.8 megohms,1/2W,10%
100 k, 1/2w, 5%
1 k, 1/2w, 5%
680 ohms,l/2 w, 5%
10 k, l/2 w, 5%
4700 ohms, l/2 w, 5%
82 ohms,l/2 w, 5%
20 k, l/2 w, 5%
112-233
112-107
112-506
m-434
112-230
112-413
112-401
112-296
118-039
112-455
112-773
112-611
112-359
112-338
112-485
112-443
112-224
112-524
1
1
1
82 k, l/2 w, 5%
1.5 megohms,1/2w, 5%
240 k, 1/2w, 5%
112-602
112-758
112-662
1
C3O1
5
C3O2,323,
334,335,346
C303,304,105, 19
309, 310, 311,
316, 317, 318,
324, 325, 330,
332, 333, 340,
341, 342, 343,
344
2
C3O6,308
C3O7
C312,345
C322
C326
C327
C328
C329
C331
C336
C337,338
C339
C345
CONNECTORS
17
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
REF.DWG.NO.: E861-476
ASSEMBLY:
VIDEOIF ANDAGC
CAPACITORS
1
C103
2
C1O4,105
1
C1O6
2
C107,124
C1O8,109,110, 12
111, 112, 113,
115, 117, 119,
120, 121, 122
C114,116,118 3
1
C123
PILOTLAMPS
DS1O1
DS102
DESCRIPTION
QTY.
MODEL COM-*
132-100
18
J3O1,302,
303, 304
TP3o1, 302
C821-155
RECTIFIERS
19
CR3o1, 302
RESISTORS
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
R3O1
R3O2,307,
312, 318
R3O3,313
R304,3O9,314
R3O5
R3O6
R3O8
R31O
R311
R315
R316
R317,320
R319
R321
R322
R323
R324
R326
R326
R327,329,
333, 334
R328
R330
R331
21
~-- - - -- -
-
-~-
-~--
~
~
REPLACEMENTPARTS LIST (Continued)
ASSEMBLY:
VIDEOIF ANDAGC
SCHEMATIC
ITEM DESIGNATION
REF.DWG.NO.: E861-476
DESCRIPTION
QTY.
JERROLD
PARTNO.
43
44
45
46
R332
R337
R338
R339
1
1
1
1
470 k, 1/2w, 5%
4700 ohms,1 w, 10%
10 k, 2 w, potentiometer
10 k, 1 w, 10%
112-695
112-447
118-026
112-489
47
48
49
51
52
TUBES
V301,302,303
V304
V305
V306
V307
3
1
1
1
1
6CB6
6DC6
6AM8
6AU6
12AT7
131-313
131-349
131-304
131-308
131-400 '
ASSEMBLY:
STANDBY-CARRIER
OSCILLATOR
SCHEMATIC
ITEM DESIGNATION
REF. DWG. NO.:
C861-478
QTY.
DESCRIPTION
JERROLD
PARTNO.
3
1
1
1000 pfd, ceramicdisc
1.8 pfd, ceramic,TCI
2 mfd, 200 v
123-115
121-039
125-060
C821-155
CAPACITORS
1
2
3
C401,402,404
C403
C405
CONNECTORS
4
J401,402
2
coaxial fittings, F-61A
5
CRYSTAL
Y401
1
45.750mc, ::!::0.005%
139-125
RESISTORS
ASSEMBLY:
SOUNDIF ANDAFC
REF.DWG.NO.:E861-477
CAPACITORS
1
2
3
8
9
10
C201
1
C202
1
C206,215,215, 11
218, 220, 223,
225, 226,227,
228, 231
2
C207,209
C208
1
C21O
1
C211,212,213, 7
216, 222, 229,
230
2
C217,224
C221
1
1
C232
11
CRYSTAL
Y201
4
5
6
7
100 pfd, mica
feed-thru,teflon
1000 pfd, feed-thru
126-013
129-226
129-200
0.01 mfd, ceramic disc
100 pfd, ceramic disc
2.7 pfd, NPO
1000 pfd, ceramicdisc
124-031
124-101
121-040
123-115
1 pfd, ceramic,TCI
1.5-10pfd, trimmer
3.3 pfd, ceramic TCI
121-058
128-510
121-006
1
36.777mc ::!::0.005%
139-146
14
J201,202
J203,204
2
2
phonejacks
coaxial fittings, F-61A
185-116
C821.155
DIODES
CR201,202
2
16
17
18
19
20
21
22
23
24
25
26
3
1
1
1
2
1
1
2
1
1
1
27
28
29
TUBES
V201,202
V203
V204,205
2
1
2
22
1
1
1
2
1
1
1
1
47 k, V2w, 5%
6800 ohms,1 w, 10%
50 k, potentiometer
2200 ohms,1/2w, 5%
100 k, 1/2w, 5%
300 k, V2w, 5%
4.7 megohms,V2 W,5%
100 k, potentiometer
112-569
112-468
118-024
112-401
112-611
112-671
112-821
118-022
14
SWITCH
K401
1
mercury relay switch
160-100
1
6DJ8
131-329
TUBE
15
V401
REF.DWG.NO.: D861-479
STANDARD-KOLLSMAN
MODELTX.PK-78;
MODIFIEDCOMPONENTS:
CAPACITORS
RESISTORS
R201,202,
207, 208
R205,209,211
R206
R21O
R212
R213,214
R215
R216
R217,219
R218
R220
R221
15
R401
R402
R403
R404,405
R406
R407
R408
R409
ASSEMBLY:
TUNER
CONNECTORS
12
13
6
7
8
9
10
11
12
13
4
IN542,matchedpair
47 k, V2w, 5%
1
2
3
C11,22
C21
C23
4
JI, 2, 3
2
1
1
6.8 pf, TCI
36 pf, TCI
0.33 pf, ceramic
3
coaxial, F-61A
1
varactor, Pacific Model
VaricapV7
128-214
1500 ohms,% w, 5%
470 k, % w, 5%
112-966
112-965
CONNECTORS
139-167
112-485
112-510
112-653
112-203
112-233
112-737
112-266
112-611
112-452
112-221
112-560
6BR8
6AU6
6CB6
131-356
131-308
131-313.
C821-155
DIODE
5
CRI
6
7
RESISTORS
R8
R9, 10
112-569
10 k, 1/2w, 5%
15 k, 1 w, 10%
220 k, Vzw, 5%
56 ohms,1/2w, 5%
100 ohms, V2w, 5%
1 megohm,V2W,5%
180 ohms, 1/2w, 5%
100 k, 1/2w, 5%
5100 ohms,1/2w, 5%
75 ohms,V2 w, 5%
39 k, V2w, 5%
121-009
121-021
122-027
1
2
ASSEMBLY:
CONVERTER
MODELS
CCV-*
REF.DWG.NO.:
E861-480,E861-510
PARTSCOMMON TO ALL MODELS
CAPACITORS
1
2
3
C501
C502
C504,507,513,
520, 527, 528,
529, 530,533
1
1
9
1.5 pfd, TCI
15 pfd, TCI
1000 pfd, ceramicdisc
121-004
121-013
123-115
REPLACEMENT
PARTS LIST (Continued)
ASSEMBLY:
CONVERTER
MODELS
CCV-'
SCHEMATIC
ITEM DESIGNATION
4
5
6
7
QTY.
C508,509,512, 10
514,517, 518,
519, 523, 524,
525
C510
1
C511
1
C516
1
REF.DWG.NO.:
E861-480,E861-510
DESCRIPTION
1000 pfd, feed-thru
ASSEMBLY:
CONVERTER
MODELS
CCV-'
JERROLD
PARTNO.
129-200
9
10
J501,502,
504, 505, 506
J503
P501
2.2 pfd, TCZ
56 pfd, TCZ
10 pfd, TCZ
121-005
121-027
121-011
5
coaxial fittings, F-61A
1
1
4-pin socket, female
6-pin plug, male
C821-155
182-103
184-004
PAD
11
-
1
plug-in pad, Model PIP-'
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
RESISTORS
R501
R502
R503
R504
R505
R506
R507
R508
R509
R51O
R511,512
R513
R514
R515
R519
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
47 k, V2w, 10%
4.7 k, 1 w, 10%
510 ohms,V2w, 5%
470 k, V2w, 10%
180 ohms,V2 w, 10%
22 k, V2w, 10%
820 ohms, 1f2w, 5%
220 k, 1/2w, 20%
27 k, V2 w, 10%
10 k, 1/2w, 10%
100 ohms, V2w, 10%
2.2 k, 1/2w, 10%
1.5 k, 1f2w, 10%
75 ohms, 1f2w, 5%
10 ohms, V2 w, 10%
112-572
112-447
112-326
112-698
112-269
112-530
112-350
112-659
112-542
112-488
112-236
112-404
112-383
112-221
112-110
27
SWITCH
S501
1
DPDTslide switch
162-003
39
40
C503
C531
1
1
1.5 pfd, TCZ
82 pfd, TCZ
121-004
121-031
41
CRYSTAL
Y501
1
101 me :t 0.005%
139-151
42
RESISTOR
R516
1
20 k, V2w, 5%
112-524
GROUP OF PARTSUSEDIN CCV-3 ONLY
CAPACITORS
43
44
C503
C531
1
1
1.5 pfd, TCZ
82 pfd, TCZ
121-004
121-031
45
CRYSTAL
Y501
1
107 me :t 0.005%
139-152
46
RESISTOR
R516
1
16 k, V2 w, 5%
112-515
GROUPOF PARTSUSEDIN CCV-4 ONLY
CAPACITORS
47
48
C503
C531
1
1
1.5 pfd, TCZ
82 pfd, TCZ
121-004
121-031
49
CRYSTAL
Y501
1
113 me :t 0.005%
139-153
50
RESISTOR
R516
1
16 k, 1f2w, 5%
112-515
GROUP OF PARTSUSEDIN CCV-S ONLY
CAPACITORS
51
52
C503
C531
1
1
1.0 pfd, TCZ
47 pfd, TCZ
121-003
121-024
53
CRYSTAL
Y501
1
123 me, :t 0.005%
139-154
54
RESISTOR
R516
1
10 k, 1f2w, 5%
112-485
55
56
GROUPOF PARTSUSEDIN CCV-6ONLY
CAPACITORS
1 1.0 pfd, TCZ
C503
1 22 pfd, TCZ
C531
121-003
121-015
57
CRYSTAL
Y501
1
129 me, :t 0.005%
139-155
58
RESISTOR
R516
1
7.5 k, 1f2w, 5%
112-473
59
60
61
62
63
64
65
Y501
Y501
Y501
Y501
Y501
Y501
Y501
TUBES
V501,502
V503
V504
I"
II
~
2
1
1
5654
6CY5
12BY7A
131-500
131-316
131-403
PARTSCOMMONTO CCV-2thru 6
CAPACITORS
31
32
33
C506,534
C515
C532
2
1
1
8-50 pfd, trimmer
0.47 pfd, QC
82 pfd, TCZ
128-501
122-002
121-031
RESISTORS
34
R517,518
2
470 ohms,V2w, 5%
112.317
PARTS
COMMONTO CCV-7 thru 13
CAPACITORS
35
36
37
38
C503
C506
C515
C534
1
1
1
1
JERROLD
PARTNO.
GROUP OF PARTSUSEDIN CCV-2 ONLY
PIP-'
*attenuation
val.factory-selected
28
29
30
DESCRIPTION
CAPACITORS
CONNECTORS
8
SCHEMATIC
ITEM DESIGNATION QTY.
REF.DWG.NO.:
E861-480,E861-510
1.5-7 pfd, NPO,trimmer
3-12 pfd, NPO,trimmer
0.43 pfd, 10%, ceramic
1.8 pfd, NPO
128-500
128-520
122-001
121-039
CRYSTALSFOR HIGH-BANDCHANNELS
1 110.5 me, :t 0.005%, Ch. 7
1 113.5me, :t 0.005%, Ch. 8
1 116.5 me, :t 0.005%, Ch.9
1 119.5me, :t 0.005%, Ch. 10
1 122.5me, :t 0.005%, Ch. 11
1 125.5me, :t 0.005%, Ch. 12
1 128.5 me, :t 0.005%, Ch. 13
139-156
139.157
139-158
139-159
139-160
139-161
139-162
23
- ~-
-
f-"
REPLACEMENT
PARTSLIST (Continued)
ASSEMBLY:
CONVERTER
MODElCCV-6,SERIES2
SCHEMATIC
ITEM DESIGNATION QTY.
REF.DWG.NO.:
E861-693
DESCRIPTION
ASSEMBLY:
CONVERTER
MODELCGV-6,SERIES2
JERROLD
PARTNO.
SCHEMATIC
ITEM DESIGNATION QTY.
123-115
21
CAPACITORS
1
2
3
4
5
6
7
8
9
10
j,
i
'"
11
12
13
14
15
16
:,
11
C501,502,503,
509, 510, 511,
519, 526, 531,
532, 533,535
C504,512,515,
516, 517, 534,
536, 537, 538,
539
C505,506
C507
C508
C513
C514
C518
C520
C521,522,
524, 530
C523
C525
C527
C528
C529
C540
12
1000pf, 500 v, ceramicdisc
1
DESCRIPTION
129 mc, :!:0.005%
JERROLD
PARTNO.
139-155
PAD
22
10
1000 pf, 500 v, feed-thru
2
1
1
1
1
1
1
4
2.0 pf, 10%, 500 v
1.0-8.0pf, trimmer
10 pf, :!:0.5 pf, 600 v
0.62 pf, 10%, 500 v
4.7 pf, :!:0.5 pf, 600 v
5.0 pf, :!:0.5 pf, 600 v
30 pf, :!:2%, 600 v
8-50 pf, 350 v, trimmer
122-030'
128-504
121-011
122-044
121-007
121-008
121-019
128-501
1
1
1
1
1
1
50 pf, :!:2%, 600 v
15 pf, :!:2%, 600 v
2.2 pf, :!:0.25 pf, 600 v
1.5 pf, :!:0.25 pf, 600 v
1.0 pf, :!:0.25 pf, 600 v
22 pf, :!:2%, 600 v
121-025
121-013
121-005
121-004
121-003
121-015
1
5
1
1
6-pinplug,male
coaxialfittings,F-61A
184-004
C821-155
182-103
185-112
4-pinsocket,female
tip jack,red
PIP
1
plug-in pad, ModelPIP-*
PIP-*
"attenuation
val.factory.selected
-
129-200
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
RESISTORS
R501
R502
R503,507,523
R504,508
R505,514
R506,522
R509
R51O
R511,520
R512,513
R515
R516
R517
R518
R519
R521
R524,525,526
1
1
3
2
2
2
1
1
2
2
1
1
1
1
1
1
3
220 k, ¥2 w, 20%
1100 ohms,¥<Iw, 5%
22 k, ¥2 w, 10%
5100 ohms, ¥<Iw, 5%
2200 ohms,¥<Iw, 5%
180 ohms,¥<Iw, 5%
10 k, ¥2 w, 10%
100 ohms, ¥<Iw,5%
10 ohms,¥<Iw, 5%
470 ohms,¥2 w, 5%
1.5 k, ¥<Iw, 5%
75 ohms,¥<Iw, 5%
510 ohms,¥<Iw, 5%
47 k, 1/2w, 5%
4.7 k, 1 w, 10%
470 k, ¥<Iw, 5%
130 ohms,¥<Iw, 5%
112-659
112-927
112-530
112-980
112-932
112-994
112-488
112-950
112.077
112-317
112-966
112-954
112-929
112.569
112-447
112-965
112-997
40
SWITCH
S501
1
DPDTslide switch
162-003
41
42
43
TUBES
V501
V502,504,505
V503
1
3
1
6GY5
5654
12BY7A
131-316
131-500
131-403
CONNECTORS
17 P501
18 J501,502,504,
505,506
19 J503
20 TP
CRYSTAL
Y501
REF.DWG.NO.:
E861-693
".
~
~
i
'.'I
MODEL CCV.6 SERIES2, TOP VIEW
I
ALL DATA SUBJECTTO CHANGEWITHOUT NOTICE.
JERROLD ELECTRONICS.
PHILADELPHIA, PA. 19132
II
CATV SYSTEMS DIVISION
I
I
-
I
A subsidiary of THE.JERROLDCORPORATION
24
8M, May 1965
8M, Jan. 1965
Printed in U.S.A.
435.374.2~f6:
~-
---

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