SPECIFICATIONS

AM TRANSMITTER

SSB TRANSMITTER

RECEIVER

Channels: AM4OCH. USB 40CH. LSB 40CH. WX (Receiver) 10CH. Emission Type: USB. LSB (A3J). AM(A3)Controls: CHANNEL SELECTOR, VOLUME, SQUELCH, REGAiN, MIC-GAIN,

CLARIFIER, SWR/CAL, CAL/SWRIMOD, MODE, LCR, SCAN, DW, NB, ANL, CH9, CH19

Jacks: Antenna, Mike, External Speaker, Head PhoneDisplay: L.C.D. Panel, SRF/Analog Meter, MOD/SWR Analog Meter. Frequency Range: 26.965MHz to 27.405MHzSupply Voltage: 13.8V DC/120V AC Negative GroundAccessories: Plug-in Mike, DC Power Cord, Mike Hanger & Screw, Manual. Antenna Impedance: 50 ohm Speaker Impedance: 4-8 ohm Operating Temp. Range: -20 degrees C to 50 degrees C

RE Power Output: AM 4 WattsModulation: High and Low level, Class BSpurious & Harmonic Suppression:

More than 60 dB

Microphone Sensitivity 50% Modulation:

2mV

A.M.C. Dynamic Range: More than 40 dBPower Drain: 13.7 VDC, l.5A

RF Power Output: 12 Watts PEPCarrier Suppression: More than 50dBUnwanted Side Band Suppression:

More than 50dB

Harmonic Suppression: More than 60dBPower Drain: 13.7VDC, 2.5A

Sensitivity: AM: 0.5uV for 10dB (S+N)/N SSB: 0.25uV for 10dB (S+N)/N Weather: 1.0mV (12dB SINAD)

Image Rejection: More than 40dBIF Rejection: 60dB Adjacent Channel Rejection: 60dB Cross Modulation: 50dB Squelch Range: Adjustable. Threshold Less than: luVRE Gain Control 30dB

Page 1 of 2Cherokee CBS-1000 Service Manual

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Clarifier Range: Coarse + 5KHz; Clarifier, ñ 2.5 K.HzAudio Output Power: 3 Watts @ 10% THD; 8 ohmsCurrent Drain: Maximum: 1.0 AMP No Signal: 0.5 AMP

Page 2 of 2Cherokee CBS-1000 Service Manual

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Cherokee CBS1000 Documentation Project

CBTricks.com Frequency Conversion

10 Bands: (A - J) 25.165 - 29.655MHz

Export Frequency Conversion

To change bands just press EMG/ CH19 button. The bands in expanded mode are displayed near the channel indicator A-J.

WARNING! Not Legal For Class D CB Use In The U.S.A.

1. Remove the top cover and look at the circuit board on the back of the faceplate.2. On this board you should see two pins SJ3 close to the CPU chip LC7232 3. Connect a jumer wire between the pins.4. Once the channel modification has been done Power on the unit holding the EMG/CH19 button

remember to hold the button for about 5 seconds after power is applied

Page 1 of 2CBS500 Frequency Conversion

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Copyright © 1998,1999,2000 CBTricks.com Disclaimer: Although the greatest care has been taken while compiling these documents,

we cannot guarantee that the instructions will work on every radio presented.

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Channel Chart

Ch. Band A Band B Band C Band D Band E Band F Band G Band H Band I Band J1 25.165 25.615 26.065 26.515 26.965 27.415 27.865 28.315 28.765 29.2152 25.175 25.625 26.075 26.525 26.975 27.425 27.875 28.325 28.775 29.2253 25.185 25.635 26.085 26.535 26.985 27.435 27.885 28.335 28.785 29.2354 25.205 25.655 26.105 26.555 27.005 27.455 27.905 28.355 28.805 29.2555 25.215 25.665 26.115 26.565 27.015 27.465 27.915 28.365 28.815 29.2656 25.225 25.675 26.125 26.575 27.025 27.475 27.925 28.375 28.825 29.2757 25.235 25.685 26.135 26.585 27.035 27.485 27.935 28.385 28.835 29.2858 25.255 25.705 26.155 26.605 27.055 27.505 27.955 28.405 28.855 29.3059 25.265 25.715 26.165 26.615 27.065 27.515 27.965 28.415 28.865 29.31510 25.275 25.725 26.175 26.625 27.075 27.525 27.975 28.425 28.875 29.32511 25.285 25.735 26.185 26.635 27.085 27.535 27.985 28.435 28.885 29.33512 25.305 25.755 26.205 26.655 27.105 27.555 28.005 28.455 28.905 29.35513 25.315 25.765 26.215 26.665 27.115 27.565 28.015 28.465 28.915 29.36514 25.325 25.775 26.225 26.675 27.125 27.575 28.025 28.475 28.925 29.37515 25.335 25.785 26.235 26.685 27.135 27.585 28.035 28.485 28.935 29.38516 25.355 25.805 26.255 26.705 27.155 27.605 28.055 28.505 28.955 29.40517 25.365 25.815 26.265 26.715 27.165 27.615 28.065 28.515 28.965 29.41518 25.375 25.825 26.275 26.725 27.175 27.625 28.075 28.525 28.975 29.42519 25.385 25.835 26.285 26.735 27.185 27.635 28.085 28.535 28.985 29.43520 25.405 25.855 26.305 26.755 27.205 27.655 28.105 28.555 29.005 29.45521 25.415 25.865 26.315 26.765 27.215 27.665 28.115 28.565 29.015 29.46522 25.425 25.875 26.325 26.775 27.225 27.675 28.125 28.575 29.025 29.47523 25.455 25.905 26.355 26.805 27.255 27.705 28.155 28.605 29.055 29.50524 25.435 25.885 26.335 26.785 27.235 27.685 28.135 28.585 29.035 29.48525 25.445 25.895 26.345 26.795 27.245 27.695 28.145 28.595 29.045 29.49526 25.465 25.915 26.365 26.815 27.265 27.715 28.165 28.615 29.065 29.51527 25.475 25.925 26.375 26.825 27.275 27.725 28.175 28.625 29.075 29.52528 25.485 25.935 26.385 26.835 27.285 27.735 28.185 28.635 29.085 29.53529 25.495 25.945 26.395 26.845 27.295 27.745 28.195 28.645 29.095 29.54530 25.505 25.955 26.405 26.855 27.305 27.755 28.205 28.655 29.105 29.55531 25.515 25.965 26.415 26.865 27.315 27.765 28.215 28.665 29.115 29.56532 25.525 25.975 26.425 26.875 27.325 27.775 28.225 28.675 29.125 29.57533 25.535 25.985 26.435 26.885 27.335 27.785 28.235 28.685 29.135 29.58534 25.545 25.995 26.445 26.895 27.345 27.795 28.245 28.695 29.145 29.59535 25.555 26.005 26.455 26.905 27.355 27.805 28.255 28.705 29.155 29.60536 25.565 26.015 26.465 26.915 27.365 27.815 28.265 28.715 29.165 29.61537 25.575 26.025 26.475 26.925 27.375 27.825 28.275 28.725 29.175 29.62538 25.585 26.035 26.485 26.935 27.385 27.835 28.285 28.735 29.185 29.63539 25.595 26.045 26.495 26.945 27.395 27.845 28.295 28.745 29.195 29.64540 25.605 26.055 26.505 26.955 27.405 27.855 28.305 28.755 29.205 29.655

Page 1 of 1CBS-1000 Channel Chart

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CLARIFIER MOD

1. Solder a wire from the top of L201 to the top pin of Clarifier Control.

2. Solder a wire from the bottom pin of clarifier to ground.

3. Remove R237

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Page 2 of 2CBS-1000 CLARIFIER MOD

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Modulation Limiter:

1.

Unsolder transistor Q30 located directly under the Weather Band Board next to Diode D24. Unsolder the part from the bottom side. Do Not Remove the Weather Band Board.

Page 1 of 1CBS-1000 Modulation Limiter MOD

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FACT SHEET

From Wireless Marketing Corp.

90% of the radios returned to us for service have failed as a result of people untrained in electronics tampering with the radios. Most of the information available on how to get more out of your radio is passed on by people who use the trial and error approach. They seldom understand the consequences or what they are doing.

Here is some REAL info on those consequences.

Quite a number of radios have come back to us with internal settings in the same position. These adjustments have caused most of the failures seen on these radios.

First of all. The bias adjustment does not work like a volume control, it controls the idle current and centers the signal in the amplifier so that neither the top or bottom of the signal is cut of and there is a minimum of DC current flowing through the transistor so that it does not heat up wasting power that is not part of the output signal. Virtually all of the radios returned for blown finals had this mis-adjusted.

Second, The bias on the driver transistor has a peak when it is set right. If it is turned too far it will lower the output on the SSB signals. It is critical for good performance. SSB modulation cannot be set properly without looking at the signal on an oscilloscope. Just turning things up while looking at a power meter will end up with a signal that so badly garbled that people won't understand you. All of the sets returned for garbled SSB had this turned all the way up.

Third, a common problem is losing RF gain control and then losing receive sensitivity. Radios that have had the ALC ( called the "limiter" by people uneducated in any electronics school ) disabled put out such a chopped up signal that the diode protection that turns off the receiver during transmit can't protect the input transistors. People have been blowing out their own receivers by trying to get "more modulation".

Fourth and worst of all, some people have been adjusting, the power supply in an attempt to get more out of the radio. It should be set for 13.7 volts. The front panel lamps are 14 volt bulbs, and if they are burning out it is a good chance that this has been turned up. This is nothing compared to what is happening to the rest of the radio. All of the transistors are being weakened and it is just a matter of time before your radio is good for nothing better than a doorstep.

Think for a minute. Would you hold a rubber band in your teeth while somebody showed you how far lie could stretch it before it broke? That is what you are doing when you do things or have them done to your radio. Most of these "secrets" being circulated are pure hogwash. They are like those ads that tell you to send them money and they will send you info on how to rig your car to use water as fuel. There are always consequences to any modification or mis-adjustment . That is why any tampering voids the warranty.

Page 1 of 1CBS-1000 FACT SHEET

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TX ALIGNMENT

PLL

TX-CB Band

Step Control / Function

Connection / Set Up Adjust Observe /

Result

P1 DC Meter to TP1 L37 5.1V +/-50mv

P2 Ch Sel 19 (27.185) Oscilloscope to TP3 L38

MAX Reading on Oscilloscope

Step Control / Function Connection / Set Up Adjust Observe / ResultT-1 CH. Sel. to 21

Mode to AM MIC to Minimum

ANT (PL259) to 50 ohm Dummy Load.Freq.Counter / RF Power Meter

T-2 Same Press MIC PTT SW RV4 Set to 4 WattsT-3 Same Same L39 Set to

27.2150XXMHzT-4 MIC to Max. Connect Audio Gen.(1KHz) to

MIC Button Terminals. Set Audio Level to 4mV

RV-5 95% Modulation

T-5 Mode to U.S.B. Same L40 Set to 27.2160XXMHz

T-6 Mode to L.S.B. Same L41 Set to 27.2140XXMHz

T-7 Same Same RV-l4 Set to 12 WattsT-8 Mode to AM Mic. to Minimum Press PTT

Switch L42,L43 L44,L45 L48,L38

Set to MAX. RF Power

Page 1 of 1Cherokee CBS-1000 TX Alignment

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RX ALIGNMENT

RX - CB Band

Weather Band

Step Control/Function Connection / Set Up Adjust Observe / ResultR-1 RF Gain Max

Squelch – Min. Clarifier – Center Channel Selector to 27.215 (21) Mode to AM

A. RF Signal Generator to ANT B. Frequency to 27.215, 30% AM Modulation C. Generator Level 3.0 uV D. Scope / Audio Meter to External Speaker Jack

SSG Level Signal With Noise 8 Ohm Load

R-2 Same Same Volume Set to 0.8V Across 8 Ohm Load

R-3 Same Same L30, L31 L32, L33 L34, L35 L36

Maximum Output Volts

R-4 Same Same - Reduce SSG To 1.0 uV

Same Maximum Output Volts

Step Control/Function Connection / Set Up Adjust Observe / ResultW-1 Channel Selector

to P1 RF Signal Generator to ANT Frequency to 162.550 MHz 4 KHz FM Deviation Level to 1 uV

L22 L23 Maximum Output Volts

W-2 Same SSG Level to 30 uV L24 Minimum Distortion on SINAD Meter/Scope

Page 1 of 1CBS-1000 RX ALIGNMENT

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Alignment Locations

RV1...TX Meter CalRV2...Squelch CalRV4...AM PowerRV5...Modulation LimiterRV7...Mod Meter CalRV8...Q38 BiasRV9...Q40 Bias

Page 1 of 1Untitled Document

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CBS-1000 WX PCB

PATTERN BOTTOM

PATTERN TOP

Page 1 of 2CBS-1000 FACT SHEET

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Page 2 of 2CBS-1000 FACT SHEET

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Parts List

Receiver Section

*NOTE: Q43 Is a misprint... This is most likely Q12, as it is in the feedback loop for RF Gain

Audio Section

TX Section

ID Function Mfg. Part #Q1 NB KEC KTC3193 Q2 NB KEC KTC3193 Q4 NB KEC KTC3193 Q3 NB S/W KEC KTA1267 Q5 NB S/W KEC KTA1267 Q16 NB S/W KEC KRC111 Q9 RF AMP KEC KTC3195 Q10 1st MIXER 2SK163 Q12 IF AMP KEC KTC3195 Q13 IF AMP KEC KTC3195 Q14 IF AMP KEC KTC3195 Q15 IF AMP KEC KTC3195 Q25 AM S/W KEC KRC111 Q7 2nd SSB MIXER KEC KTC3199 Q24 AM S/W KEC KRC111 Q23 SSB S/W KEC KRC111 Q43* RF Gain Control KEC KTC3195 Q57 WX S/W KEC KRA101 Q59 WX SW KEC KRC111 Q44 WX VCO KEC 2SK192A Q46 WX VCO BUFFER KEC KTC3880 Q47 WX RF AMP KEC KTC3880 Q54 WX MIX KEC KTC3880 Q65 WX IF AMP KEC KTC3880 IC1 SQ, METER, AGC CONTROL ROHM BA728 IC9 WX DETECTOR ROHM BA403

ID Function Mfg. Part #IC8 MIC AMP KEC KIA4558 Q26 AM S/W KEC KRC111 Q29 ALC CONTROL KEC KTC3199 Q31 ALC CONTROL KEC KTC3199 Q30 ALC CONTROL KEC KTA1267 Q37 SSB ALC CONTROL KEC KTC3195 Q71 AM MODULATION AMP SANYO 2SB824 Q50 SSB S/W KEC KTC3199 Q72 AM MODULATION AMP KEC KTC3199 Q67 MODULATION METER AMP KEC KTC3195 IC3 BALANCE MIXER NEC UPC1307 IC5 AUDIO POWER AMP KEC KIA7217

Page 1 of 2CBS 1000 Parts List

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PLL Section

POWER SUPPLY SECTION

ID Function Mfg. Part # Q38 POWER MITSUBISHI 2SC1969 Q40 DRIVER MITSUBISHI 2SC2166 Q41 PRE DRIVER SANYO 2SC2314 Q42 PRE DRIVER KEC KTC3192 IC6 MIXER KEC KIA6058

ID Function Mfg. Part # Q17 CHARGE PUMP KEC KTC3199 Q18 CHARGE PUMP KEC KTC3199 Q19 VCO AMP KEC KTC3195 Q20 4.5 MHz OSC KEC KTC3880 Q21 VCO OSC KEC KTC3195 Q22 VCO AMP KEC KTC3195 Q33 10.695 MHz OSC KEC KTC3195

IC201 CONTROL & PLL HYUNDAI LC7232 IC202 AM SSB S/W MOTOROLA MC14066

ID Function Mfg. Part # Q35 TX S/W KEC KRC110 Q36 TX S/W KEC KTA200 Q68 CLARIFIER S/W KEC KTC3875 Q69 CLARIFIER S/W KEC KTC3875 Q74 AC/DC CONVERTER KEC KTB778 Q76 AC/DC CONVERTER KEC KTC1027 Q73 AC/DC CONVERTER KEC KTC200 Q74 AC/DC CONVERTER KEC KRC111 Q203 TX S/W KEC KRA101S Q204 HOLD S/W KEC KTA1504 IC4 8 VOLT REGULATOR DAEWOO 78L08 IC5 5 VOLT REGULATOR KEC 78S05

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