President Grant CB-Radio


I make a special EPROM expansion board that will add 4 more bands to many radios that use either Binary or BCD programming, it also adds a 10KHz shift function as well, click here to find out more.

It will give 1 band down, 1 band up, UK 40 (up 64 channels without Alpha ch hops), NZ 40 (down 63 channels) and 10KHZ shift.

On a 40 channel radio it will give coverage from 26.335 to 28.005 (including the normal low,mid and high bands of 26.515-27.855), that is a total of 167 channels !

I can also make a custom board upon request which will give whatever frequency range you want (within the limits of the radio).


ALIGNMENT PROCEDURE


PLL and CARRIER OSCILLATOR PORTION


Test equipment required:
Power Supply: 13,8 VFrequency CounterDummy Load 50 ohmOscilloscope
DC VTVM

Preparation alignment:
ClarifierMid.
SQ GAINMax.
AF GAINMax.
RF GAINMax.
MIC GAINMax.
MOD, S/RFS/RF
NB/ANLOff
RF SSGModulation: 30% AM 1000Hz
StepConditionAdjustmentProcedure
1MODE: RX AM
Ch. 19 MID.
L17Connect osciloscope on TP4. Adjust for maximum reading.
2MODE: RX AM
Ch. 40 MID.
L18Connect DC Voltmeter on TP2. Adjust to obtain 5,5Volt.
3MODE: RX AM
Ch. 19 MID.
L19Connect oscilloscope on TP3. Adjust for maximum reading.
4MODE: RX AM
Ch. 19 MID.
L25Connect Frequency Counter on TP3. Adjust to obtain 16.490MHz +/- 20Hz.
5MODE: RX USB
Ch. 19 MID.
L26Connect Frequency Counter on TP3. Adjust to obtain 16.4925MHz +/- 20Hz.
6MODE: RX LSB
Ch. 19 MID.
L27Connect Frequency Counter on TP3. Adjust to obtain 16.4875MHz +/- 20Hz.
7MODE: TX LSB
Ch. 19 MID.
VR6Connect Frequency Counter on TP3. Adjust to obtain 16.875MHz +/- 20Hz.
8MODE: RX AM
Ch. 19 MID.
L22Connect Frequency Counter on TP3. Adjust to obtain 16.040MHz +/- 20Hz.
9MODE: RX USB
Ch. 19 MID.
L23Connect Frequency Counter on TP3. Adjust to obtain 16.0425MHz +/- 20Hz.
10MODE: RX LSB
Ch. 19 MID.
L24Connect Frequency Counter on TP3. Adjust to obtain 16.0375MHz +/- 20Hz.
11MODE: RX LSBL30Connect Frequency Counter on TP6. Adjust to obtain 16.6975MHz +/- 20Hz.
12MODE: RX USBL29Connect Frequency Counter on TP6. Adjust to obtain 16.6925MHz +/- 20Hz.
13MODE: TX AML28Connect Frequency Counter on Base from TR43. Adjust to obtain 16.6950MHz +/- 20Hz.


TRANSMITTER PORTION


Test equipment required:
Power Supply: 13,8 VAF Signal GeneratorRF Dummy Load 50 ohmOscilloscope
RF Power MeterFrequency Counter

Preparation alignment:
ClarifierMid.
SQ GAINMax.
AF GAINMax.
RF GAINMax.
MIC GAINMax.
MOD, S/RFS/RF
NB/ANLOff
StepConditionAdjustmentProcedure
1Mode: TX USB
27.185MHz
S1 and S2 OFF
VR11Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 50mA.
2Mode: TX USB
27.185MHz
S1 and S2 OFF
VR9Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 4mA.
3Mode: TX USB
27.185MHz
S1 and S2 OFF
VR10Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 80mA.
4Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L46Set the core of L46 to the bottom, adjust VR12 to minimum.
5Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L45 L48 L49Adjust the cores to obtain max. deviation on RF VoltMeter. Repeat this operation with lower AF levelss on MIC input.
6Mode: TX USB
27.185MHz
S1 and S2 ON
Modulation: 2,4kHz and 500Hz
L46Adjut to obtain max deviation on RF Voltmeter. Adjust to obtain a mimimum power difference between Ch.40 HIGH and Ch.1 LOW
7Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz
L37Adjust to obtain max deviation on S/RF Meter
8Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz
VR12Adjust to obtain 32,4 Volt on RF VoltMeter
9Mode: TX USB
27.185MHz
S1 and S2 OFF
VR7Adjust to obtain minimum difference between USB and LSB
10Mode: TX AM
27.185MHz
S2 OFF
VR13Adjust to obtain 10 Watt on RF Power meter
11Mode: TX AM
27.185MHz
S2 OFF
VR8Set Switch on S/RF. Adjust to set the S-meter between the Red and Green field
12Mode: TX AM
27.185MHz
S1 ON
Modulation: 1kHz 30mV
VR14Adjust to obtain 90 % AM-Modulation on Oscilloscope.
13Mode: TX FM
27.185MHz
S1 ON
Modulation: 1kHz 30mV
VR5Adjust to obtain +/- 2 kHz deviation on DeviationMeter.
14Mode: TX AM
27.185MHz
S1 ON
VR15Set switch on MOD, AF SignalGenerator to obtain 50% modulation. Adjust levels of AF Signal Generator to 16dB. Adjust VR15 to obtain 100% modulation on S-Meter.


RECEIVER PORTION


Test equipment required:
Power Supply: 13,8 VRF Signal GeneratorDummy Load 8 ohmOscilloscope
AF VTVM

Preparation alignment:
ClarifierMid.
SQ GAINMax.
AF GAINMax.
RF GAINMax.
MIC GAINMax.
MOD, S/RFS/RF
NB/ANLOff
RF SSGModulation: 30% AM 1000Hz
StepConditionAdjustmentProcedure
1Mode: RX AM
Band: Mid.
Channel: 19
L8Set RF SSG on 27.185MHz, 1kHz 30% AM-mod. Adjust L8 for maximum reading on oscilloscope.
2Same as STEP 1L7 L9 L11 L12 L13 L52 L3 L4 L5Adjust level of RF SSG to obtain 2V on AF VTVM then adjust coils for maximum reading on meter.
3Same as STEP 1L8Adjust to obtain minimum difference between Ch. 40 and Ch. 1
4Same as STEP 1VR1Set the level of RF SSG to 100mV. Adjust VR1 for "5-9" reading on tranceiver meter.
5Same as STEP 1VR4Set SQ on max. Adjust level of RF SSG to 1000mV, adjust VR4 so that the radio signal will apper on tranceiver. Set SQ on minimum.
6Same as STEP 1
Mode: USB
L14 L15Set RF SSG on 27.186MHz. Adjust coils to obtain maximum reading on oscilloscope.
7Same as STEP 1VR2Set level of RF SSG to 100uV. Adjust VR2 to obtain "S9" on transmitter meter.
8Same as STEP 1
SQ: Max.
VR3Set level of RF SSG to 1000mV. Adjust VR3 so that the audio signal will apper on tranceiver
9Same as STEP 1
NB/ANL: ON
MID, Ch.18, USB
L1 L2Set RF SSG on 27.185MHz, 0% Mod., 10uV Level. Connect oscilloscope on D2 and adjust the coils to obtain maximum deviation.
10Same as STEP 1L6Set RF SSG on 27.185MHz with 1 kHz deviation, 1000mV Level. Adjust L6 to obtain maximum.


This counter shows the number of hits since the 7th November 1999


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