Sencore CB42 User manual

CB42
AUTOMATIC CB ANALYZER
OPERATION, APPLICATION AND MAINTENANCE MANUAL
{"i~Z' SENCORE
~ THE ALL AMERICAN LINE OF HIGH QOALITY TEST EOUIPMENT

CB42
AUTOMATIC CB ANALYZER
OPERATION, APPLICATION AND MAINTENANCE MANUAL
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TABLE OF CONTENTS
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Il1Ilide Front Cover
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SAFETY REMINDERS
DESCRIPTION
INTRODUCTION
FEATURES ...
SPr£IFICATIONS
CONTROLS
OPERATION
INTRODUCTION . . .
POWER CONNECTIONS
rUSE REPLACEMENT ....
CABLE SWITCH
ACCESSORY.
TRANSCEIVER SETUP ....
POWER SUPPLY VARIATIONS
RF GENERATOR
IF GENERATOR .
AUDIO OUTPUT ....
FREQUENCY COUNTER .
PERCENT OFF CHANNEL
CRYSTAL CHECK .
RF WAITMETER ' .
PERCENT MODULATION AND
mSTORTION .
AU 010 WATTMETER AND SPEAKER SUB ..
SCOPE ADAPTER
APPLICATIONS
TRANSCEIVER THEORY AND TROUBLESHOOTING
Introduction
AM Transmitter . .
AM Redev ....
Singl~onversion iF
Dual.Convenion IF .
Automatic Noi$ll Limiter
Automatic Noise Blanker.
Single Sideband Operation
SSB Transmitter ...
SSB R",ce;v",r • • . .
Frequency Synthesizer
Phase Locked Loop .
AM RECEIVER TESTS
Audio
Output Power .
Squelch ......
EIA ~nsitivity
Adjacent Channel Rejedion
AGe.. . .
Receiver Gain . . . . . .
ErA Impulse Noise Limiter . .
Special Applications of Dynamic Mike Tester.
SSB RECEIVER TESTS
General
ReceiV*!r Test/Clarifier Adjustments
SSB Receiver Sensitivity . . . .
SSB Adjacent
Sideband ReJection
SSB AGe .
SSB Squelch ......
SSB Impulse Noise
Test . . .
AM &SSB TRANSMI'ITER TESTS
AM Tnmsmitter Frequency .
SSB
Transmitter Frequency. .
SSB
Percent Off Channel. . .
ssa Clarifier Control .
SCOPE ADAPTER APPLICATIONS
Residual Carrier
Noise. . .
Trapezoidal Modulation Test .
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· 4'
· 4'
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.Inside Bad: Cuver
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sse One-Tone Method
SSB 1'"10'0- Tone Methoo
MAINTENANCE AND SERVICE
INTRODUcrlON .....
FUNCfIONAL DESCRIPTION AND BLOCK DIAGRAM
CO~PLETE CIRCUIT DESCRIPTION.
ACCESS/DlSASSEMBLY . .
CALIBRATING
PROCEDURES
Eq\lipmen~ Requirements
Power Supply . . .
Scope Adapter. . .
DVM .
Audio and RF Watta
Percent Modulation.
RF·IF Output ...
RF·IF Modulation .
Audio Two-Tone •.
FTequ"ncy Counter. . . . .
Pen::ent Oft Channel SensltiYity
CB RF Tuner PLL .
SERVICE A.."lD WARRANTY .....
,

DESCRIPTION
INTRODUCTION
The great volume uf sales of Class D <27 MHzI Citizen's
Hand (CB) radio tran!IC;evers has created agreat de-
mand for CB service. The CB42 CB Analyzer wmhines
all functiol18 necessary for alignment and U"ouble·shoot·
ing of HOY Class D tran~iver including the 40 ChaRMl
models.
Since all signals and measurements nceed FCC
specifications, Ihe te<:hnician using the CB42 ~Iln be aure
the final proof "fperformance figures are correcl when Ii
seTv;re job is complete.
To get maximum effective""" from your CB42, you
should lJecol1le thoroughly familiae with ita operation
and applications before putling the instrument to use.
Play the Familiarization Tap" supplied with the instru·
ment. Then read through the s~l>-by·s\ep instructions in
the Operations Sfflioll of this rnMua] as well as the Ap-
plicatio;>ns Section,
FEATURES
The CB42 CB Analyzer includeB all n~8SIlry functions
for
CB alignment and troubleshooting, The CB42 out-
puts include a 40 channel RF tuner, adjustable IF
g.merator a",j audio generator. A sp""ial scope adapter
output allows any IMHz scope to he u~ for ~a .. ier
troubleshooting.
The CB42 also includ~" hij(h accuracy
auto-ranging digital frequency oounter with 7 digits
of readout. Spe<:ial CB tests include dil'(ital readout or
crystal activity, RF and audio power. and percent
modulation, Sencore's exclusive Percent Off Channcl
and simpl if>e<l EIAreceiver ""nsitivity tests are included
to speed transceiver trouhleshooting.
SPECIFlCATIONS
RF_IF GENERATOR
RF GENEHATOR
METHOD: Crystal-controlled. digitally pro-
grammable phase-locked loop lPPLL),
CI:l AM: 40 standard FCC ClallS Dcbannels, switch
5elected.
CRYSTAL ACCURACY: Setability .±- .0001%
~1 ppm) @ 25° C; temperature stability: Ippml
C; aging: 5 ppm/mo, 10 ppmfyear max.; warm_
up time: 45 minute. for TIlted accuracy.
MODULATION: Internal AM modulation atO, 30.
or 100'1> using internal Audio Generator. or exter-
nal input on rear panel. External input: 4 V pop re-
quired for 100% modulation.
IF GENERATOR
Five continuously variable bands, from
315KHz_12MHz.
MODULATION: Same sa RF Generator.
MONITORING
Either RF or IF {raquent"y may bo1 monitored with
4
internal frequency counter.
OUTPUT AITENUATOR
OUTPUT iMPEDANCE: 50 Ohms
RANGE: .luV-.1V (lOOK uV) in 6continuously
,'ariable stePl!.
PROTECfION: Diode protected against acciden-
taltransmit.
AUDIO GENERATOR
FREQUENCY: 400, 1000 Hz, Or EIA SSB Two-
tone (500+2400 Hz)
ACCURACY: ±Hl%
OUTPUT: 0_4 VP_P, AC ooupled into 50 Ohms or
greater load. Usable into 8ohnt8.
FR~:QUENCY COUNTER:
DlSPLA Y: 1digit, 7segment. LED display __ auto
ranging. l.ED "KHz, MHz" indicators controlled
by auto range.
RANGE: 50Hz_50MHz (guaranteed), SSMHz
(typical)
CRYSTAL ACCURACY: Setability i.0001%
(1 ppm) @ 25° C; tempenotute stability: 1 ppm/
o C;aging: 5 ppmfmo, 10 ppm/year max.; Warm_
up time: 45 minutes {or rated accura<;y.
INPUT IMPEDANCE, 1 MCj!'ohm or 50 Otmu.
RESOLUTION: \0 Hz
SENSITIVITY 300 mW (SO Ohm inllUt. 25 Watts
PEP maxI. 25 mV (l Megohm input, SO Hz_30
MHzl.
CRYSTAL CHECK:
Ml::THOD: &rie.. resonanteircuit for fundamental
cl)'lItal frequent)'.
HANGE: \-20 MHz
ACCURACY: Same as FrequenW Counter
PERCE"''T OFF CHANNEL:
METHOD: Displays pert ... "t f""IUenW deviation of
transmitter compared to CB RF TUNEH frequen_
cy
RANGE: 0-1.0000% transmitter error.
ACCUHACY: j:.OOO2% (2S·C), j:.002% (15°_35°
C,
DISPLAY: 6_digit 0.0001% Resolution, LED "'"
on- CHANNl::L" indi<:ator.
PERCI'NT MODULATiON
METHOD: Indicates lle"",nt ~ontinuous tone AM
modulation, positive or negative for sine wave
modulation. Compart'S peak audio to average RF
carrier.
HANGE: (Positive): 0-200%, (Negative): 0-9S%.
ACCURACY:
±5% o{ reading (30-100% I
DISPLAY: 31/2 digit 0.1% resolution. LED "%
Mod" indicator,
RF POWER WA'ITMETER
RANGE: 0-20 watts Peak Envelope Power (PEP),
20-30 MHz.
ACCURACY: .±. 5% of reading (2-20 WPEP).
INPUT IMPEDANCE: 50 Ohnu
DISPLAY: 3 \/2 digit. 0.01 Watt resolution. Lim
·'WATT'S" indicator.
I

AUDIO POWER WATIMETER
METHOD: Peak..:ll!till:ting, RMS-reading power of
~ine wave acr ... in«!rnalload_
RANGE: 0-19.99 Wattl RMS.
ACCURACY: ±6'J.
LOADS:
INTERNAL: 4,8, or 16 OhllV.l0 Wattl eon-
Linuou5, 20 Wattl for 30
ieCOod •.
EXTERNAL: Calibnlled for 8Ohms.
DlSPLAY,3 tn digit, .01 Warts reaolution. LED
"WArt'S" inditlltor.
SCOPE ADAPTER OUTPUT
ME'niOO; Heterodynes RF signal to under IMH~
RF RANGE: 26.~27.9400 MH~
LOCAL OSCILLATOR: 26.925 MHz ApproJ:.
OUTPUT VOLTAGE: .5V at 1 WaLt RF.
OUTPUT FREQUENCY: 40 KHt-480 KHt
(class D channel, 1-40).
INPUT IMPEDANCE: 60 Ohm.
SIGNAL TO NOISE SENSITIVITY TEST
METHOD: Standard EIA 10 dB IS +N)lN tftt.
Audio P ...... er Wattmetft" Rnaitivity is increaaed
IOdB for Nolte Ref..,..,.......
GENERAL:
FUSE: IA Fut_blow, type 3AG
ELECTRICAL, All IOlid 1ItIl~ circuitry, irlCluding
CMOS LSI.
MECHANICAL: Vinyl·cllld
~leel with aluminum
trim. Carryinl hllndle. Lud ~torale romparunent
in Mtk of cue.
SIZE: II"" 14"" 11 .. 1H .... 'D}.l28cmx J.5.5on"
-,.
WEIGHT: 24 lb. (10.9 K,).
POWER: 1000-IJO VAC, 60/60 H~. 16 W; or 12
VOC, lA. 220 VAC modifkation available Bt
extn cost.
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ACCESSORIES
Included,
390102 Dynamic Mike Tetter
390104 RF Cable Assembly (BNC/
PL259)
390105 Countn Probe (isolated/direct)
390106 Audio Lead Aa&embly (phone,
test clipa)
39GI09 Audio wd A5$Cmbly (phooef
min. phone)
390110 RF Probe Assembly (50 Ohm
Terminated)
OPTIONAL ACCESSORIES:
RfSZl5 Rf ~_1lroiIdI ~nr-..;lI"
boIh 1110 C842 Rf·lf ... d SO.Qh", lold
jlclll, n UlKtl Ih. proptf Clbl. wilh I
Milcl1. Juu I iii"'" coftntetioft 101M CB
illU tNt it -.loIId ~t "lIplif~ C8 1*.
I"., III ~I al ......... -moily .... oil
o •• aIii. autputI. . . • . $2!ill)
Available through Senoore dbtributon or Service
Parto Department, Seneore, Inc.,
3200 Sencore Drive,
Siou" ~·alu.SD 57107.

CONTROLS
1.
2.
3.
••
,.
,
7.
DIGITAL READOUT provide$ all output ~ad.
Inp ineluding RF Pow"", Audio Power, Pfttellt
Mooullltion, Modub.tor Oiatortion. Percent orr
Oulnnel, InlA!mallllld External Frequtncirs. In-
dudes LED indinto ... of r&lll'e and tunetion.
DIGITAL READOUT SELECTOR Sel~ .11
functio", of DIGITAL READOUT.
• tAo RF·IF GEN monitonl inU!m.al frequ~ney olRf
TImER or IF GENERATOR.
• 28. EXT XTAL rMils fundamental frequency of
ayahl pluAed intoo front-~lWl ;I<:IL
• :?C. IMEG LOAD IUd. nu.mal frequency ap-
plied to IMEG
INPln' jack on (ront ... oel.
• 20. SO.()HM LOAD readI utemal frtq\leney
,pp~ to 5O-OHM INPUT jack on tront panel.
• 2K"" orF CHAN read. pt'Kent of deviation fTom
t"CC Ipedfication$ of Ulnimitttr feedin, into
front-panel 5O-OHM INPVT' by eomparing incom.
inl frequency tQ CB RF TImER.
•2F. '" POS MOD re.lb IImount o(poIIit;ve modula-
tion U • pt'l'centage by determinin, aver.gll RF
power, and comparing pea"" of modulation.
.2G. %NEG MOO reada amount of ne,ative
moduluion a6 II percentage by determininc
avenge RF power, and comparing ne,ltive
modulation Iwinp.
·2H. RF WATTS r.-d. P.-k Envelope Power
{PEPI of input at SO·OHM INPUT ,itock .t (ront
penel.
Reid •• verlse or PEP power with lime
~I.
.2.1. AUDIO WATTS rellds ludio output power of
recei"er Ipplied to SPEAKER SUB input ,itock on
front penel.
·2K. SIN CHECK pushbutton i~ AUDIO
WATTS functilKl
by 10 dB, Ind remov. moduli.
lion (rom RF carrier provided by CD RF nJNER
for performit\l EIA stlndlrd IOdB IS ... N) Ntest.
SPEAKER SUB elimin.atell need o( ahop epe.ke ..
<!urine routine tesQ. Provide stlndlrd impetl• .-
lo-dsol4. 8..nd 160HMS phaopt>on oIusilll ex-
tern.1
'9!ruer.
SPEAKER SUB INPIJr -eon,·~ioent (ront-""nel
jack for co~illfl ludio output 01 r«:eiver to
SPEAKER SUB for meuurin •• udio OUlput
power.
HIGH SENSITIVITY FREQUENCY COUNrER
INPUT Ia.-ded with IMegohm (or me',"uin. fre..
quenc:ie8 to 50 MHz with Isensitivity of 2!0 mV.
.so OHM WADED INPllT for me.surinl frequency
output ot tr.uumitter plus aU other transmitter
OOlpul functioM.
CRYSTAl. CHECK SOCKET IUOWI .ny Iype
cry~tal to be inserw<t for adirect readout ofcrystal
frequency.
AUDIO SELECTOR SWITCH chOOIeI 400 or
1000 Hz or SSB two·tone (500 + 2400 Hz) for
modulation
of intemll RF-IF generator or for
output I.hroulh front-panel,itock. ,
9. AUDIO OUTPUT controlf the .moont of audio
fiKn.a1 .... il.ble.1 fronl ""n.d AUDIO jack.
10. POWER SWITCH COntrol5 both AC po.-er.nd 12
'·011 inPUI f'O'I'I"e •.
II. SCOPE ADAPTER JACK ptO'·ides a1MHI m",,:,
OUlput fienal corretponditllllo ClItTieI'- flgllli.
12. GROmm conn«tion.
13. AUDIO OIJrPUT jIIck. Provides audio frOIll inter_
nal
.udio ,ffle'tator. ControllN by AUDIO OUT.
PUT
COfIltoi.
14. RF ·IF OUTPUT jldl PtO¥idK finlle CJIbie OOtpul
from imern.1 RF ·IF GENERATOR.
I!>. MICROVOLTS OUTPUT CONTROLS provide
adj~t.ble Rp·IF output from .1 uV to .1 V.
16. AUDIO MODULATION SWITCH prov;d .. 30 or
I()Q'J, modu IRlHln from inlern.l g@n@ralor for RF.
IF Gt:NERATOIt.
or [email protected] modulation from
rea. panel connectilKl.
I j. IF TUNING CONTItOL .. 1I"w~ adjuslment of any
of 5IF bIlnds.
18. RF·1F GENEHATOR CONTROL.
•
18A. AM OUTPUT Il.ovide •• wild .. selectable CD
channel outpul for $landard 40 ch.nn@1 frequen.
ci@s. Selected by CB TUNER.
•18B. SSB OlTfPUT provides EIA f1and.rd USB
or 1.5B
li~nll 1000 liz .. above or belo,.· fllndard
CB ch.nnel for SinlleSidebend recei"er alienmenl
.nd Iroubll!ihool;"I.
•18C. IF GENERATOR ptO"idl!l!!o overlappit\llF
bands from 37!0 KHz Ihroogh 12 MHz- Tunable
,.·ith IF nJNING corormOL.
19. BAND SELECTOR SWiTCH dloo"" dlannel
1·23 or 24-40 on RF JUNER SWITCH.
20.
40 CHANNEL CD RFTUNER ~'Oftln.
datd C1aff DCB treql.lenciK.
21. LEAD STORAGE COMPARThlENT
22. AC LINE CORD
23. 12 VOLT OC INPUT
24.
B+ FUSE
25. EXTERNAL AUDIO
INPIJr for emmal modu-
Wion of RF·IF GENERATOR.
SUPPLIED CABLESfACCESSORIES
26. 390109 AUDIO CABLE for eonnecting fJll!.aker
output to SPEAKER SUB input (Min. PhlKlef
phone).
27. 300106 AUDIO CABLE for dirf:ct .udio con.
nection. (phono/teft dipt).
28. 39G102 DYNAMIC MIKE TESTER for injedinc
audio Into microphone.
29. 39Gl05 COUNTER INPUT CABLE provides a
direct
or isolated input to the 1Meg frequ@ncy
counter input.
80. 300104 RF CABLE for transceiver testin,
(BNC/PL259),
31.
39G110 TERMINAn:O RF CABLE providel
matching from
50 Ohm output of RF-IF GEN.
ERATOR for injeding into VlUiOUI circuitJ.

BACK
PANEL
i---{,
3
"
"
23
SUPPLIED ACCESSORIES
7

OPERATION
INTRODUCTION
The instructions tOt yout CB42 are broken into two
parts. This seetinn describes geneml operations of
each of the tests available on the CB42. The following
Applications
~etion covers the basic theory of opera·
tions of aCB transceiver. followed by speciti,; te!lts
that the CB42 can perform. Each test in the Applica·
tions Section gives step·hy·.Lep instructions for
the
setup and applications of varinu. tests I()commended
POWER COtN:CTIONS
The CB42 may be used either on the shop bench or in
the field for complete receiver and transmitter per·
formance testing
at the radio's location. Two power
cables are provided Cor 105.130 VAC, 50/60 Hz
operation or +12 VDC operation.
1. For AC power operation, pull the ~C line cord
from the storage compartment in the back of
the CB42 and connect it to asource oC AC
power. IC desired, the storage compartment door
may be dosed by passing the cable through the
notch at either top corner of the door.
2. For 12 VDC operation, pull the light<!r plug and
cable from the storage compartment and con·
ned to an automotive cigarette light<!r socket
supplying
12 Volts negoli!N! ground.
NOTE:
The CB42 will operate properly
only from a12 Volt negatiue ground
syw~m. Internal protection circuit/; pre-
VCr\t damage if connected to apositive
ground system, bllt the C842 will be in.
FUSE REPlACEMENT
The 8+ fuse is located on the back panel. This fuse is in
the DC voltage section to protect the CB42 wilen it is
lIsed with either AC or DC input voltages. If the fuse
sllould need replacing, replace it only with a 1 Amp,
3AG Cast-blow type. Any
other siw fuse may result in
serious damage to the CB42 and will void eitller tile
CABLE SWITCH ACCESSORY
The separate RF_IF OUTPUT jack and 50 OHM
INPUT jack offers the advantage oC proper 50 Ohm
termination for areceiver or transmitter while signals
are being injected from the
H.F or [I" generator.
The acC<'SIlory RFS205 RF switch allows switching
the CB's antenna connector between the signal
output jack and the 50 Ohm load. In many cases, the
RFS20& will simplify performance testing when CBs
are being run through atest position (such as Quality
8
by the FCC and the Electronics Industries A$SOCia-
ti'm (EIAl.
Thc$C ""me 1e$ts are listed in the CB42 Speed Test
Setup Booklet iilso included with the CB42. Once
you ale flUlliliar with the specific tellts, the Test Stotup
Booklet should ¢ve the necessary information as to
test setup and interpretation.
operative.
3. Press the ON side
oC the OFF-ON switch to ap"-
ply power to the CB42. The DIGITAL READ·
OUT will light when power
is applied.
4. Allow the CB42 to operate at least 45 minutes
to allow the high accuracy crystal oscillators in
the RF generator and digital Crequency cOllnk'r
to stahilize.
NOTE: Many
CB tranllCCivers are de-
signoo
to operate with either apositive
or negative groundoo automotive elec·
trical system. Many of these units have a
rOO pos.itive lead and black negative Iud
rather than apolarity reversal switc:h. In
many cases,
the negative lead i3 not con·
Dl~Cted to the cha.'j,m ground. For proper
ahielding, and tranamitter operation,
BOTH the negative supply lead and
chaw mould be connecWd to the neg..
tive supply terminal of the power supply
as well as to the common jack on the
CB42.
9O·day warranty or the 100% Made Right Lifetime
Guaran~.
The primary of the transformer has internal protection
agaiDllt ashorted ilecondary. and requires no additional
fu ....
Assurance tests).
The RFS205 provides awarning light which indicates
that the transmitter is being broadcast into the pro-
tion c;n,uits oC the fly·n' OUTPUT jack.
The RFS205 may be purchased Crom the Sencore
Factory Service Department, or any local Sencore
FLPD Distributor.

TRANSCEIVER SET-UP
Refe!" to special note under "Po"'·er Connee·
tioM ...
All signal input terminations and transmitter and
audio output loao:h, as specified by CB manu·
faclure<$, have been built into the CB42. No
additional modifiClltions ue required for 0pera-
tion into IheIe clllibl1lted loads.
I.
2.
Connect the l.laIUOeiver under le!it to the propl.'r
voltage 1OUI'C'e, as
specified by the equipment
m&nufactu.rer. MOit mobile unitl requirf! a
power SOlUte capable of lupplying 13.8 VDC at
2A. EIA recommended tHta also sptcify testll
for varying the voltage .:t.15% from 13.8 VDC,
(11.5·15.9 VOC). The Senco", PS43 Porta·Pak
and UPS164 Universal Power Supply have been
especially designed
to provide theae variable vol·
... ~
The foilOW'inC ~ standard test conditio~ and
pel"fonnanoe limits as l'l.'C(m!J>('<lded by 1ol'ading
CB manu!aeturen. Set the tnuuoei~ control!5
to the pOiitions listed 10 perfmm initial .... t-up
for all basie tell"".
3.
VOLUME
TONE CONTROL
SQUELCH
NOISE LDUTER
(A."IL" ANB ... itch)
RF GAIN
MIC GAIN
PA SWITCH
213
of full rotation
""'~,
Mu:. unlQl>elch
ocr
Full Gain
Full Gain
In
"CR" pOlition
ipecificationl establimed by
Frequency ltability
of
tnnlmitter to be maintained.
~ 20% (11.0-16.6) Unit shall operate
Transmit Power
Sensitivity
POWER SUPPLY VARIATIONS
The ElA specifies that all receiver and tnlnsmitter
teJtl be performed with an input of 13.8 VOC (or 12
VIX: unita. The EIA code RS-382 further specifies
leIts to be perfm-med with araiaed OJ" lowered supply
voltage
to be SII", that the l"l'Oeiver ..-ill operate under
different voltqe alpply conditions. An e:sUl\ple of
Ndl variations ill found in a 12 Volt automotive elec-
trical system when the lUlit
is operating just from the
battery (12 Volta nominal) and when the alternator
or genemtor circuib are providing mulmum eharging
voltage
(14.16 VollJI).
The adjustable outpuUi ot the Seneo", UPS164
Universal Power Supply or PS43 Porta·Pak power
Sllpply allow the'll varioUi testI to be performed.
RF GENERATOR
The following are the
the EIA:
Vary
in
ll.:t. 10'.l.:
(12.4·15.2 VDC):
±15% 111.7.15.8)
Transmit Power
Audio Power
Sensitivity
Sq ......
~2dB
~2dB
.:t. 2dB
±2dB
±3dB
±3dB
The RP GENERATOR pr<Mdes a chotcJl! of amodu·
lated or unmodulated signal at the nandan! CB
channl:'l frequenciel (or AM troubleshooting, or lingle
sideband
outpub. The SSB outpuUi are 1000 Hz
allove the standard AM chllnnel for USB operation, or
1000 Hz below the standard AM channel tor LSB
operations. The SSB sign.... provide a 1000 Hz beat
tone in aproperly opl'n.ting SSB receiver.
To UIIe lJle RF GENERATOR:
1. Connect the CB42'1 RF·IF O1.JTPUT jack to the
IUltenna lnPllt of the CB receiver !Uin, the 1Up--
plied RP cable.
2. Select the modulation level desired, 0,-. (CW)
using the EXT poiition of the AUDIO MODU·
LA nON switch with no external input, 30 or
100% from the internal audio generator. or an
external modulation
llOurce through the I'f'al
panel jack (4V p. p. I~ modulation).
9
3. Select the proper inUrnal modulation frequency
if the internal audio ll'I!nel'll.tor is used. Uae 1000
Hz for standard testa.
NOTE: The ~tting of the AUIllO OlIT·
PlIT control does not effect the modula-
tion level
of the RF generator.
4.
Set the RP-IF GENERATOR Ieleetor switch to
the AM position (or OUlput on the uandan:! AM
dlannels. Set the switdl to USB (Upper SiM:-
band) or LSB (Lower Sideband) for SSB le!itiJ\i.
NOTE: When in either SSB po&ition,
the modu.Lation from
the audio generator
is
aut~ticaUy disconnected.
5. Rotate the CB RP TUNER to the desired CB
channel.

CI IIf TUNEII
•
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IIf_lf OENfllATOII
AUDIO DIGITAL
IIfAOOUT IILICTOR
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MICIIOVOLT OUTPUT
PlAKEII IU.
''I. :'"
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A,.ALYZ,,.O OUTPUT IIG,.ALI MODEL
G'G'T.L IIEAOOUT '_UT IIG,.AU
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CI .... .. .......
..
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ro
Fig. 2-Con/rol«/up tor RF Ou/pur.
6. If it is desired to monitor the RF frequency,
tum the DIGITAL READOUT SELECTOR to
the RF·IF GEN position. The frequency will be
read on the DIGITAL READOUT.
7. Adjust the signal level into the transceiver with
the
two MICROVOLTS OUTPUT controls. The
controls are direct reading when feeding a50
IF GENERATOR
The IF GENERATOR provides achoice of amodu.
IAted or unmodulated signal at any frequency from
375 KHz to 12 MHz for injection into any single- Or
dual-<)Onversion IF stage.
The adjU$uble
IF generator ill designed for trouble-
shooting any single- Or dual-<:onversion IF system.
Due to the wide tuning range of the IF generator
(375 KHz·12 MHz), the IF frequency may change
over aperiod ot several minutes. It is recommended
that the generator trequency be monitored U$ing the
RF-IF GENERATOR position
of the DIGITAL
READOUT SELECTOR. Aslight
touch.up of the IF
TUNING control is all that is necessary to provide the
desired IF frequency.
The CB42 IF generator is designed tor trouble-
shooting defective IF stages and rough alignment of
10
Ohm load. Simply read the ~tting of the vernier
control, and multiply by the step attenuator
setting for the actual RF output in microvolts.
NOTE: The output attenuator is diode.
protected to prevent damage if the tram-
mitter is keyed into the RF-IF OUTPUT
jack.
these stages. Most manutacturers recommend that the
final IF alignment be made by injecting an RF signal
at the antenna input on Channel 11 through 13 and
tuning the IF stages (or J:le.st seI1llitivity. If an IF stage
is completely out of alignment, use the IF generator
to set the IF stage close to the desired IF trequency.
Then lIM! the high-aeeuracy CB RF TUNER signals
for final IF touch·up to c<lmpensate (or receiver local
oscillator or cel1lmic filter designs.
To use the IF GENERATOR:
1. Connect the supplied RF cable terminated in
test clips to the RF·!FOUTPUT jack. This cable
is terminated with a 50 Ohm load to prevent
standing waves
in the output cable and contains
aseries DC.blocking capacitor.

Fl6. 3-Conlrolllelup {or IF Output.
Ca a, Tu_a
y
g
"nY5S""
uu. uu
..... NCOC- .................
0 0 0 0 0
1I II I
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••
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--
DIGITal MaoouT MllCTOII
...... _ ... - 1
"-
--
--
,,
.. 30:,
:C)':::'j
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---
0
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MtcllOVOLT
OUTfOtJT
_AICIIl _
.:~::-
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"
aNALYZING OUTlIUT IIGNAll
Moon
DiGITAL ilIAD OUT ._ SlONALS
ca ••
.. .....
J'
••
•
rn
l!='~
I
2. Select 1M modulation level desired: ~ (CW)
using the EXT po&ition of the AUDIO MODU.
LATION
n'itch with no exlemll input, 30 or
l~ hom the inloernal audio /ll"Derator, or an
e:lternal modulation IOtIfl:!e ~p1ied through the
fftr-panel jack (4 V P - P - 100$ modulation).
5. Set the DIGITAL READOUT SELECTOR to
the RF_IF GEN position to read the end IF
frequency.
6. Adjust the IF 'IlJNING COIluoi until the DI·
GITAL READOUT indicatel
the desired fre-
quency.
•
3. SeIfft the pr~ in~ modulation fr&quency
if the internal audio ~ta if;~. Use 1000
Hz for ltandard testa.
NOTE: The Rltinl: of the AUDIO OUT·
PUT
rontrol does DOt afreon theJllodula-
tion Iewl of tbe IF generat ...
4. Seleer. the 1'reql1ency range of me aeoerator by
",ttin, the RF-IF GENERATOR ",lector .witch
to the position lhlIt includel the desired IF
frequency.
7. AdjUit the IignaJ level with the twO ~lICRO·
VOLTS OUTPUT ronuolL These COlltroU are
direcT. readinl _tltn feedinl mto. 50 Ohm lo-d.
Simply rad the ",Iting of the vernier control
and mu.ltiply by ttlt step attenuator setting for
the ac:l>.lallF OUtput in mic:rovotu.
NOTE:
The output attenuator if diode-
proU<:ted to preftnt damage if the tranI-
mitler if; keyed into the RF-IF OUTPUT
;ack.
AUDIO OUTPUT
The AUDIO GENERATOR provides achoice at two
audio tones (400
or 1000 Hz) Or .. balanct.'<i two·tone
SSB output. The output level is adjustable independ·
ently of the modulation of the internal nF·IF
GENERATOR.
To use
the AUDIO GENERATOR OUTPUT:
1. Plug either the audio cable (phono connector to
aDilator connectors) or the 390102 Dynamic
Mike Tester
into the AUDIO OUTPUT ,.,ck on
the CB42 hont pinel.
11

CI RF TUNER
T
'''11111''''
" n " ;:I ,., n
UUUI_.UU
a .. NCO "', "".
o0 0 0 0
,,,m
._ "H',
o ·'or~
IIF." UE .. IIIIlTOII
II
llUOlO
OllllTlll III11llllUT SEUCTOII
llUOlO OUTPUT
BPEllKER BUI
• 0 .ft
';;:'::'~'"
Fig. 4---eontrol S<1tup (or Audio OUlput.
ll .. llLVZ, .. lI OUTPUT SllI .. llLI MOOn
CI,n
., .
W
NOTE: When feeding the audio $i.gnal
diredly to the microphone input using
the audio tell lead, the level of audio
signal may overdrive the mic pre-amp.
IllIIerting alOOK Ohm resistor in $enes
.nth the red tes~ lead will Uliually match
the output impedance of the generator
to the input impedance of the pre-arnp.
2. Sele<:t the audio frequency desired (400 Hz.
1000 Ht, or SSB two.tone) a~ the AUDIO
sele<:tor switch.
3. Connect the audio cable to the desired test point
or place the microphone on top of the rubber
cushion on the Dynamic Mike Tester.
FFEOUENCY COUNTER
The FREQUENCY COUNTER inputs of the CB42
allow external frequencies
of up to 60 MHz to be
measured With the resulting frequency indicated on
the DIGITAL READOUT. The CQunter offer.; both a
50 Ohm loaded input or high-o;ensitivity 1 Meg input.
To use the 50 OHM LOADED EXTERNAL FRE-
QUENCY input:
12
OllllTllL IIEIlDDUT I_UT IIl1NllLI
.........
4. Adjust the AUDIO OUTPUT control lor an
adequate audio level.
NOTE: When
the SSB two-tone i5 used
for web tests as the alignment of the
balanced modulator of an SSB traru-
mittff, the audio should be fed dir'e<:tly
inlo the audio circuitry or the trail&-
ceiver rather than using the Dynamic
Mike Tester. The reason lor this is the
lh!quency response of mOllt CB micro.
phonl!$ Ulied with
the Dynamic Mike
Tester will cause
the cardll.lly balanced
leveb
of the two audio signals to become
unbalanced which may indicatc symtoms
in the transmi~ter that are no~ actually
present.
1. Connect the output of the transmitter to be
tested to the 00 OHM EXTERNAL FRE.
QUENCY inpllt jack using the supplied RF
cable.
2. Seleo:t
the EXTERNAL FREQ., 500HM LOAD
position
on the D!GITAL READOUT SELEC·
TOR.

cs Il~ TUNER
•
g
=', ,n,-n,...,
L '. 'U.:JUU
a........ co""o;;: ."",, <0 ••• co".
000 0 0
WTJ
...
u,
D'GITAl IlEAlIlIUT !lLECTlIA
00 co
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II
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OJ OJ
OJ OJ
MODEl
DIGITAL IlEAOOUT IN"UT SIGNALI
C842 ." ,,"
.'
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Fig. S-COntrol Setup for 50 Ohm F'Nrquellcy Counler.
3. Key the transmitter and read the frequency
dire<:tly
On the DIGITAL READOUT. If the
frequency is less than 100 KHz, the FRE·
QUENCY COUNTER will indicate KHz with
the decimal point properly positioned, and the
"KHz" L.E.D. lit. If the input f~quency is be·
tween 100 KHz and 50 MHz. th(' FREQUENCY
COUNTER will indicate
MHz with the d('cimal
point properly positioned. and the "MHz"
L.E.D. lit.
c •• , .UNf •
•
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"n"nn
U.L''-JUUU
S_NCO"'. DO'."" ..... n.
0 0 0 0 0
i I d I I
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OHmA' .UOO<Jr SHEcro.
,
({)
({) (()
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It
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0000
MOGH
GIOITAL IlEADOUT ,_U' "'GNAL"
C ... 2
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Fig. 6-(;o/llrol Selup (or 1 Meg Frequency Counter.
fo
13

To Woe the 1MEG LOADED EXTERNAL FRE.
QUENCY input:
1. Connect the test point to be measured to the 1
MEG LOAD input using the ~pecial frequency
counter teat lead. Thi. lead has aground connec·
tion (black alligator clip) and two input leacb.
The red lead provide. a direct conne.:tion to the
counter, and the yellow lcad is isolated with an
internal 33
pF capacitor to minimi~ circuit
loading.
PERCENT OFF CHANhEL TEST
"'lid lit .. ,
II
2. Select the EXTERNAL FREQ., 1MEG LOAD
pOllitioo on the DIGITAL READOUT SEL.
LECTOR.
3. Read the test point frequency on the DIGITAL
READOUT.
The MHz and KHz lights will dit.-
play the range !Seledeod by the automatic TlITlging
circuits of the FREQUENCY COUNTER, and
the de.:imal point will he positioned appr<;>-
prilltely.
nnn,.,u'"
uu.uu-..J
o0 0 0 0
, .. ,"
D'G,r"'L RUIlOUT SELECTIlR
,~,.!.,. •
•
0:·
Illl.'n ... ~ .n.DouT ,NpuT lIOo ..... ~.
,::11:'"
Fig. 7-Control Setup for % off Channel
The PERCENT OFF CHANNEL test will indicate the 7.
percentage of deviation of the CB tr'lInsmitter'l fre·
quency from the FCC specs on the DIGITAL
READOUT.
To perform the PERCENT OFF CHANNEL teat:
1. Connect the transceiver to the pro,"",r power
source aJl described in the PREPARING FOR
TEST Ilection.
2. Connect the antenna output of the transceiver
to the 50 OHM input of the CB42 using the sup-
plied
RF cable.
3. Set the DIGITAL READOUT SELECTOR to
the % OFF CHAN position.
4.
Set the RF·IF GENERATOR selector switeh
to the AM p06ition.
5. Select
the same channel on the CB RF TUNER
and
the transceiver Wlder ted. Key the trans-
mitter.
If afrequency error of more than .005% uindio
cated, the DIGITAL READOUT SELECTOR
may
be moved to the 50 OHM EXTERNAL
FREQ. position
to determine if the tmnsmitted
signal frequency is higher or lo .. er than the pro-
per frequency.
NOTE: Areading of a transmitter fre·
quency 0.0043·.0057% off channel would
be considered questionable since the trans-
mitted frequency is at the very limit of the
FCC specs. The rnnge gi....,n also includel
the poslIibilily of the CB RF TUNER
operating slightly 0(( channel but still .. ith·
in its frequency limits. The IUspeded. bad
tnlll.'lmitter may be retested usin« the
EXTERNAL FREQUENCY function and
referring to the upper and lower limits
table fOWld in the TClIt Setup Booklet.
6.
The DIGITAL READOUT will indicate the
amount of transmitter frequency error. The FCC
allows amaximum
error of .005%.
14
8.
Repeat the test on all transmitwr channell by
changing the transmitter's channel !Selector con-
trol at the wne time as the CB RF TUNER
switch.

CRYSTAL Ct£CK
C. IIIf TUNER
•
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DIGITAL IllEAOOUT
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MODEL
DigITaL III~ADOUT I .... UT SIGNALS
ca ••
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m
Pi8. 8-Cmltrol Selup (or Cryslal Check.
TM CRYSTAL CHECK function allows any crystal
witb afundamental frequency of 1·20 MHz to be
inserV:'d into the front panel universal crystal socket
to check for crystal activity. Tbe crystal will be made
to resonate at its fundamental operating frequency.
To perfonn tbe external CRYSTAL CHECK:
1. Insert the crystal to be tested into the front·
panel lOcket marked CRYSTAL CHECK.
2.
Seled the EXT XTAL position of the DIGITAL
READOUT SELECTOR.
3. Read
the fundamental crystal frequency on the
OlGITAL READOUT. Defedive or inoperative
crystals will be indicated by an intermittent or a
RF WATTMETER
WARNING: The RF power output should
be checked before making any modulation
or frequency test.!! on a CB transmitUr. If
the last three digit.o of the digital readout
show aflashing "888", the transmitter ill
providing more than 20 Watta output. If
this overrange condition is present, imme·
diately
stop testing until the power output
is reduced to prevent damage to the 50
Ohm load, and possible damage to the
tralWl1itter'a output stages.
15
zero frequency readout.
NOTE: Many crystals used in CD tnms-
eeiven are dffigned to operau on an
overtone,
rather than their fundamental
frequency.
For example, an O$CilIator
oPtrating at 27.000 MHz wiU ~ a third
overtone crystal with afundamental fre-
quency of 9.000 MHz. This fundamental
frequency is
the one that the CB42 will
indicate. The exact operating frequency
of the crystal depends on the circuit it i6
part of. For an exact ~ading of a
crystal's operations, it should be mea·
.Uffld in..::iro:uit with the 1Meg fre·
quency counter input.
The RF WATfMETER of the C842 is designed to
read tbe Peak·Envelope·Power (PEP) of tbe RF signal.
This allows the
&al11e meter to read SSB PEP, or aver·
age AM carrier power.
To usetbe RF WATIMETER:
1.
Connect tbe transceiver to tbe proper power
JOurce as dC6Cribed in the PREPARING FOR
TEST section.
2. Connect the antenna output of tbe tran~iver
to the 50 OHM input of the CB42 using tbe sup·

CB II. TUNlII
~
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000'-;.00
a_NCO""'" ... " ..... ~ ... ".
o0 0 0 0
~., "
DIG"Al REAflOUT SElECTOII
00
II
Fig. 9-Colltrol Setup {or measuring AM RF Power.
ANALVZINO OUTPUT SIGNALS MODEl
1'8.2
.' .
m
DIC"AL READGUT INflUT SIGNALS
.'-
" .. "'"
plied RF cable.
3. Select the RF WAT'l'S function of the DIGITAL
RJ.;ADOUT SELECTOR.
4. For AM power, key the transmitter and read the
RF Watts output On the DIGITAL READOUT
with no
modulation applied to the microphone.
The legal maximum reading is 4Watts. With
modulation, the PEP reading meter will indicate
the carrier plus the sideband power of the signal.
The maximum legal power for afully modulated
AM signal is 16 Watts PEP.
... ... _ ... , .....
.. ........ _,-_.
..:::r.
-,
'M'
·'rxt
d. Key the SSB transmitter with either the USB
or LSB function On the transmitter selected.
e. Gradually tum the AUDIO OUTPUT control
to ma:<imum. Most transmitters will be able
to provide at least 8 Watts PEP. The legal
mlUimum output power is 12 Wattl PEP.
Fig. lO-Colltrol Setup {or measuring SSB RF Fower.
NOTE: When mea!lurlng a\'erage AM
carrier power, shield the mike from mod·
u1ation sources llII modulat;on wiJI cause
an increase in the RF power reading.
For SSB power:
a. Plug
the 39G102 Dynamic Mike Teiter into
the AUDIO OUTPUT jack.
5.
b. ScllX't the SSB TEST position on the audio
selector switch.
c. Place
the CB mike over the cushion on the
DylWlmic Mike Tester. Press the mike against
the cushion to insure good acoustical coup.
ling.
16

CB II. TUNlII
~
!nIj
000'-;.00
a_NCO""'" ... " ..... ~ ... ".
o0 0 0 0
~., "
DIG"Al REAflOUT SElECTOII
00
II
Fig. 9-Colltrol Setup {or measuring AM RF Power.
ANALVZINO OUTPUT SIGNALS MODEl
1'8.2
.' .
m
DIC"AL READGUT INflUT SIGNALS
.'-
" .. "'"
plied RF cable.
3. Select the RF WAT'l'S function of the DIGITAL
RJ.;ADOUT SELECTOR.
4. For AM power, key the transmitter and read the
RF Watts output On the DIGITAL READOUT
with no
modulation applied to the microphone.
The legal maximum reading is 4Watts. With
modulation, the PEP reading meter will indicate
the carrier plus the sideband power of the signal.
The maximum legal power for afully modulated
AM signal is 16 Watts PEP.
... ... _ ... , .....
.. ........ _,-_.
..:::r.
-,
'M'
·'rxt
d. Key the SSB transmitter with either the USB
or LSB function On the transmitter selected.
e. Gradually tum the AUDIO OUTPUT control
to ma:<imum. Most transmitters will be able
to provide at least 8 Watts PEP. The legal
mlUimum output power is 12 Wattl PEP.
Fig. lO-Colltrol Setup {or measuring SSB RF Fower.
NOTE: When mea!lurlng a\'erage AM
carrier power, shield the mike from mod·
u1ation sources llII modulat;on wiJI cause
an increase in the RF power reading.
For SSB power:
a. Plug
the 39G102 Dynamic Mike Teiter into
the AUDIO OUTPUT jack.
5.
b. ScllX't the SSB TEST position on the audio
selector switch.
c. Place
the CB mike over the cushion on the
DylWlmic Mike Tester. Press the mike against
the cushion to insure good acoustical coup.
ling.
16

AUDIO WATTS AND SPEAKER SUB
CI RF TUNIR
...
/cg
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a_NCO __ .. ,." co ".",,, ••
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... lS
DIOITAL AfADOUT .UICTOR
•
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S'EAKER lUll
000"
..... ~."
Moon
DIGITAL RUDOUT INPUT SIGNALI
CIU
.........
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I
NOTE: F .. _ .. id1
.... moI_ ONL ....
SooZbbol __
INTERNAL
LOADS
Fig. 12-{:o71trol Setup for meawring Audio Power.
The internal SPEAKER SUB providM a ma\.chE'd and
calibrated load for audio power measurements and
eliminates unwanted audio noise during routine test.-
ing. The SPEAKER SUB used in conjunction with
the AUDIO WATTS function of the DIGITAL
READOUT provides aconvenient
method of <teter.
mining r~iver outpu~ power and reoeiver sensitivity.
To use ~he AUDiO WATI'S and SPEAKER SUB:
1. Connect the speaker outpu~ to the SPBAKER
SUB input jack using one of thc supplied audio
cables. Sinoe
most reoeivers have aminiature
phone jack for the external speaker output, one
of the audio cables is supplied with aminiature
phone plug. The other cable provides alligator
connectors for direct ronnection to aspeaker or
internal connection.
2. Select arated speaker load using the SPEAKER
SUB swi\.ch.
a. The internal 10 Watt load is used to provide
4, 8,
or 16 Ohm tennination. When the
18
internal SPEAKER SUB is used, the AUDIO
WArt'S function reads the output power
directly.
b. If an external speaker or load if used, select
the SPEAKER position on the SPEAKER
SUlI
swikh. In this position, the AUDIO
WArrs fundion will read directly if an 8
Ohm load is used. If a4Ohm load i. used. the
reading of the AUDIO WATIS function must
be doubled. If a 16 Ohm load is used. the
reading mus~ b/! halved for the ac~ual audio
power.
3.
Set the DIGITAL READOUT SELECTOR to
the AUOiO WATIS position. The DIGITAL
READOUT will now read
the audio output
power of the amplifier section in RMS Watts.
NOTE: For specific appliClltionr of lhe
A
UDIO WATTS funclion, .ee the AppliCll-
tions Section.

SCOPE ADAPTER
c: ... TUM'"
~
/©\
~o
6 • ......."."... _ ............
0 0 0 0 0
1111 ,
0000
,
II
,
0 0 0 0
A".A~YZI".G OUTPUT .IGNALI MOOn OIGITA~ AIAOOUT INPUT IIGNAU
r~e' .. ;;; ..
'"~
, ... "'"
,.
•
•
The SCOPE ADAPTER OU\PUt provides. convened
output of Ole modulation l'nvelope present ulhe 50
OHM input U I frequency under 1MAl. ThisllloWi
Illy generll pufJ"* scope (with. bandwidth of 1\
Ieut 1 MAl) \0 be used for lIlalylis of the modu·
lI\ion envelope. Specific 'PPlications of this output
Il'II! lUted in the App!ieation.. Se<;t.ion.
To \I5Je the SCOPE ADAPTER:
1. Connect the 0KiI10lC0J)l' verticil input probe \0
tbe SCOPE ADAPTER outpu\ jack on the
CB42. Connect the sc:ooe D'OWld lNd \0 the
blac:l< binding po5t. Set the ICOpe verticaltmpll'
(ler to 1Volt per division.
2. Connec\ the RF output of the CB Ndio to the
50 OHM LOAD input jlck of the CB42 using
the supplied RF able .
I'
3. Key the tflnsmitter. The scope displ.y will &how
!he c:Il'rier infonllltiQfl (.5 V p.p indiatel .bout
1 Witt RF).
". Modul.te tbe eIrrier of the uaumitt.er. The IIH
of the AUDIO OlrTPUT IIld the 390102
DynlllDk: Mike TesteT provides Ic:onYeslient
method of modulatinl dle c:arrier. The scope
will now MOW the modulitillll. l'nwlope. Adj....t
the s<:ope for proper sync on this compolite
wlveform.
NOTE: The s<:ope adapter will pro¥ide In
output wilb. JiInaIlpplied 10 the 50 OHM
LOAD input;.ct. ~n of the poIition
of Ute DIGITAL READOUT SELECTOR.
Set page. 43 fllro",11 46 of the f1pp/iCfJllon •• eflon
flU lpfeiGI KOPf adflpter apph·CfJflon•.