Ranger
RCI-2970
Documentation Project
CBTricks.com
TX Alignment
TX Alignment Locations
| SETTINGS | CONNECTION |
|
ADJUST FOR |
|
Remove
TP1, TP2, TP3 Jumper PCB.
|
|||
| DRIVER
BIAS: Set mode to LSB Mic Gain to minimum |
Connect DC Ammeter between TP9 and TP8. |
VR11
|
In TX adjust for 50-75mA. |
| FINAL
BIAS: Set mode to LSB Mic Gain to minimum |
Connect DC Ammeter between TP9 and TP7. |
N/A
|
In TX check for 160-180mA. |
|
Replace
TP1, TP2, TP3 Jumper PCB.
|
|||
| Mode
LSB Frequency to 28.000MHz Adjust VR14 fully counterclockwise. Adjust VR12 fully counterclockwise. Set generator for 30mV RMS, 1KHz sinewave. |
Connect
an audio generator to (pin 2) and ground (pin 1) of Mic connector. Connect a wattmeter and 50ohm dummy load to the antenna connector. Set wattmeter for 30W scale. |
Mic
Gain
|
Key the transmitter and slowly increase Mic Gain until you obtain about 10W. |
|
L19,
L48
L47, L46, L43, VC3 |
Adjust for maximum reading on wattmeter. Reduce RF gain if necessary to maintain about 10 to 15W on wattmeter. | ||
| Increase
Mic gain to maximum (fully clockwise). |
Same as above. |
L34
|
Adjust for maximum output power |
| SSB
CARRIER BALANCE: Set mode to USB MIKE GAIN to minimum. |
Same as above. |
VR7
|
Key TX; adjust for minimum carrier on scope or wattmeter. If necessary readjust for best balance of sideband suppression between LSB & USB |
| SSB
HIGH PWR: With Mic gain still a maximum on LSB Set RF PWR control on radio to minimum. |
Same
as above. |
VR12
|
Key the transmitter and adjust for 28W. |
| SSB LOW
PWR: With Mic gain still a maximum on LSB Set RF PWR control on radio to minimum. |
Same as above. |
VR16
|
Key the transmitter and adjust for 10W. |
| AM POWER
HIGH: Set RF PWR control on radio to maximum Put mode selector on AM. Mic Gain to minimum |
Connect a
wattmeter and 50ohm dummy load to the antenna connector. Set wattmeter for
30W scale. |
VR13
|
Key transmitter with no modulation applied and adjust for 10W. |
| AM POWER
LOW: Set RF PWR control on radio to minimum. Mic Gain to minimum |
Connect a wattmeter and 50ohm dummy load to the antenna connector. Set wattmeter for 30W scale. |
VR15
|
Key transmitter with no modulation applied and adjust for 2W. |
| RF METER: Set RF PWR control on radio to maximum. Mic Gain to minimum. |
Connect a
wattmeter and 50ohm dummy load to the antenna connector. Set wattmeter for
30W scale. |
VR8
|
Adjust so panel meter agrees with Wattmeter. |
| AMC: Mode to AM Set generator for 30mV RMS, 1KHz sinewave. With Mic gain at maximum |
Same as above. |
VR14
|
Adjust for 100% modulation. Use modulation meter or oscilloscope with RF sampler. |
| FM DEVIATION: Put mode selector on FM |
Key transmitter and check for 4kHz deviation ± 0.5 kHz. Use deviation meter or service monitor. |
N/A
|
Simply check
for sufficient transmit audio. There is no deviation adjustment provided in this radio. |
Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.