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).
| Power Supply: 13,8 V | Frequency Counter | Dummy Load 50 ohm | Oscilloscope |
| DC VTVM |
| Clarifier | Mid. |
| SQ GAIN | Max. |
| AF GAIN | Max. |
| RF GAIN | Max. |
| MIC GAIN | Max. |
| MOD, S/RF | S/RF |
| NB/ANL | Off |
| RF SSG | Modulation: 30% AM 1000Hz |
| Step | Condition | Adjustment | Procedure |
|---|---|---|---|
| 1 | MODE: RX AM Ch. 19 MID. | L17 | Connect osciloscope on TP4. Adjust for maximum reading. |
| 2 | MODE: RX AM Ch. 40 MID. | L18 | Connect DC Voltmeter on TP2. Adjust to obtain 5,5Volt. |
| 3 | MODE: RX AM Ch. 19 MID. | L19 | Connect oscilloscope on TP3. Adjust for maximum reading. |
| 4 | MODE: RX AM Ch. 19 MID. | L25 | Connect Frequency Counter on TP3. Adjust to obtain 16.490MHz +/- 20Hz. |
| 5 | MODE: RX USB Ch. 19 MID. | L26 | Connect Frequency Counter on TP3. Adjust to obtain 16.4925MHz +/- 20Hz. |
| 6 | MODE: RX LSB Ch. 19 MID. | L27 | Connect Frequency Counter on TP3. Adjust to obtain 16.4875MHz +/- 20Hz. |
| 7 | MODE: TX LSB Ch. 19 MID. | VR6 | Connect Frequency Counter on TP3. Adjust to obtain 16.875MHz +/- 20Hz. |
| 8 | MODE: RX AM Ch. 19 MID. | L22 | Connect Frequency Counter on TP3. Adjust to obtain 16.040MHz +/- 20Hz. |
| 9 | MODE: RX USB Ch. 19 MID. | L23 | Connect Frequency Counter on TP3. Adjust to obtain 16.0425MHz +/- 20Hz. |
| 10 | MODE: RX LSB Ch. 19 MID. | L24 | Connect Frequency Counter on TP3. Adjust to obtain 16.0375MHz +/- 20Hz. |
| 11 | MODE: RX LSB | L30 | Connect Frequency Counter on TP6. Adjust to obtain 16.6975MHz +/- 20Hz. |
| 12 | MODE: RX USB | L29 | Connect Frequency Counter on TP6. Adjust to obtain 16.6925MHz +/- 20Hz. |
| 13 | MODE: TX AM | L28 | Connect Frequency Counter on Base from TR43. Adjust to obtain 16.6950MHz +/- 20Hz. |
| Power Supply: 13,8 V | AF Signal Generator | RF Dummy Load 50 ohm | Oscilloscope |
| RF Power Meter | Frequency Counter |
| Clarifier | Mid. |
| SQ GAIN | Max. |
| AF GAIN | Max. |
| RF GAIN | Max. |
| MIC GAIN | Max. |
| MOD, S/RF | S/RF |
| NB/ANL | Off |
| Step | Condition | Adjustment | Procedure |
|---|---|---|---|
| 1 | Mode: TX USB 27.185MHz S1 and S2 OFF | VR11 | Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 50mA. |
| 2 | Mode: TX USB 27.185MHz S1 and S2 OFF | VR9 | Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 4mA. |
| 3 | Mode: TX USB 27.185MHz S1 and S2 OFF | VR10 | Disconnect PC834. Connect DC Current Meter on TP9(+) and TP8(-). Adjust for 80mA. |
| 4 | Mode: TX USB 27.185MHz S1 and S2 ON Modulation: 2,4kHz and 500Hz | L46 | Set the core of L46 to the bottom, adjust VR12 to minimum. |
| 5 | Mode: TX USB 27.185MHz S1 and S2 ON Modulation: 2,4kHz and 500Hz | L45 L48 L49 | Adjust the cores to obtain max. deviation on RF VoltMeter. Repeat this operation with lower AF levelss on MIC input. |
| 6 | Mode: TX USB 27.185MHz S1 and S2 ON Modulation: 2,4kHz and 500Hz | L46 | Adjut to obtain max deviation on RF Voltmeter. Adjust to obtain a mimimum power difference between Ch.40 HIGH and Ch.1 LOW |
| 7 | Mode: TX AM 27.185MHz S1 ON Modulation: 1kHz | L37 | Adjust to obtain max deviation on S/RF Meter |
| 8 | Mode: TX AM 27.185MHz S1 ON Modulation: 1kHz | VR12 | Adjust to obtain 32,4 Volt on RF VoltMeter |
| 9 | Mode: TX USB 27.185MHz S1 and S2 OFF | VR7 | Adjust to obtain minimum difference between USB and LSB |
| 10 | Mode: TX AM 27.185MHz S2 OFF | VR13 | Adjust to obtain 10 Watt on RF Power meter |
| 11 | Mode: TX AM 27.185MHz S2 OFF | VR8 | Set Switch on S/RF. Adjust to set the S-meter between the Red and Green field |
| 12 | Mode: TX AM 27.185MHz S1 ON Modulation: 1kHz 30mV | VR14 | Adjust to obtain 90 % AM-Modulation on Oscilloscope. |
| 13 | Mode: TX FM 27.185MHz S1 ON Modulation: 1kHz 30mV | VR5 | Adjust to obtain +/- 2 kHz deviation on DeviationMeter. |
| 14 | Mode: TX AM 27.185MHz S1 ON | VR15 | Set 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. |
| Power Supply: 13,8 V | RF Signal Generator | Dummy Load 8 ohm | Oscilloscope |
| AF VTVM |
| Clarifier | Mid. |
| SQ GAIN | Max. |
| AF GAIN | Max. |
| RF GAIN | Max. |
| MIC GAIN | Max. |
| MOD, S/RF | S/RF |
| NB/ANL | Off |
| RF SSG | Modulation: 30% AM 1000Hz |
| Step | Condition | Adjustment | Procedure |
|---|---|---|---|
| 1 | Mode: RX AM Band: Mid. Channel: 19 | L8 | Set RF SSG on 27.185MHz, 1kHz 30% AM-mod. Adjust L8 for maximum reading on oscilloscope. |
| 2 | Same as STEP 1 | L7 L9 L11 L12 L13 L52 L3 L4 L5 | Adjust level of RF SSG to obtain 2V on AF VTVM then adjust coils for maximum reading on meter. |
| 3 | Same as STEP 1 | L8 | Adjust to obtain minimum difference between Ch. 40 and Ch. 1 |
| 4 | Same as STEP 1 | VR1 | Set the level of RF SSG to 100mV. Adjust VR1 for "5-9" reading on tranceiver meter. |
| 5 | Same as STEP 1 | VR4 | Set 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. |
| 6 | Same as STEP 1 Mode: USB | L14 L15 | Set RF SSG on 27.186MHz. Adjust coils to obtain maximum reading on oscilloscope. |
| 7 | Same as STEP 1 | VR2 | Set level of RF SSG to 100uV. Adjust VR2 to obtain "S9" on transmitter meter. |
| 8 | Same as STEP 1 SQ: Max. | VR3 | Set level of RF SSG to 1000mV. Adjust VR3 so that the audio signal will apper on tranceiver |
| 9 | Same as STEP 1 NB/ANL: ON MID, Ch.18, USB | L1 L2 | Set RF SSG on 27.185MHz, 0% Mod., 10uV Level. Connect oscilloscope on D2 and adjust the coils to obtain maximum deviation. |
| 10 | Same as STEP 1 | L6 | Set 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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