Galaxy
DX Radios DX2517 (MOSFET Final)
Documentation Project
CBTricks.com
Transmitter
Alignment
See Alignment
Locations
| SETTINGS | CONNECTION |
ADJUST
|
ADJUST FOR |
|
Remove TP7-TP9 Jumper PCB.
|
|||
| TX
OFFSET FREQUENCY: Set mode to LSB RX |
Connect Frequency Counter to TP3. |
VR7
|
Key
TX; Adjust for 16.2675MHz ±20Hz. |
| TX
CARRIER OSCILLATORS: AM TX Mode Band D CH. 1 |
Connect Frequency Counter to TP6 |
L25
|
LSB/ TX mode: Adjust for 10.6975MHz ±20Hz. |
| Connect Frequency Counter to TP6 |
L24
|
USB/ TX mode: Adjust for 10.6925MHz ±20Hz. | |
| Connect Frequency Counter to TP5 |
L23
|
AM/ TX mode: Adjust for 10.6950MHz ±20Hz. | |
| DRIVER BIAS:
(IRF520 Vg) Set Radio to: Band D, Ch.1 Mode to USB MIKE GAIN at minimum. |
Connect DC Ammeter between TP7 and TP9. |
VR12
|
Key TX adjust
for 50mA. Verify 3.75vdc max.on bare lead of resistor in L37. |
| FINAL BIAS: (IRF520 Vg) Set Radio to: Band E, Ch.1 Mode to USB MIKE GAIN at minimum |
Connect DC Ammeter between TP7 and TP8. ****Warning**** Setting these adjustments are critical and exceeding the maximin voltage and current settings will cause damage to the transmitter and void the warranty. |
VR10 VR11 |
Preset both VR10 & VR11 for zero mA in TX mode. Key TX & adjust for 50mA. Verify 3.50vdc max on bare lead of resistor in L34. Key TX & adjust for 100mA. (total for both VR10 & VR11) Verify 3.50vdc max on bare lead of resistor in L33. |
|
Replace
TP7-TP9 Jumper PCB.
|
|||
| RF AMP
CHAIN: Replace shorting pcb. Set mode to AM. Set RF power control to MAX. |
Connect wattmeter to ANT output. |
L44,
L43,
L42, L40, |
Key TX &
adjust (in order) for maximum RF output . Recheck power across entire freq.
range. |
| SSB
CARRIER BALANCE: Set mode to USB Set RF power control to Max MIKE GAIN to minimum. |
Connect
wattmeter to ANT output. |
VR6
|
Key TX, adjust for min. carrier leakthrough on scope or wattmeter. Recheck on LSB mode. If necessary readjust for best balance of sideband suppression between LSB & USB |
| SSB APC:
Set mode to USB Set RF power control to MAX. MIKE GAIN to minimum. |
Connect DC voltmeter from pcb ground to TP7 |
VR17
|
In TX,
adjust for 13.0vdc |
| SSB
ALC: Mode to USB. MIKE GAIN to maximum. Inject two-tone audio signal of 700Hz and 1900 Hz, 30 mV to Mic input. |
Connect
wattmeter to ANT output. |
VR13
|
In
TX, adjust for 28 watts PEP. |
| AM
CARRIER POWER: Set mode to AM, MIKE GAIN at minimum. RF Power control to MAX. |
Connect
wattmeter to ANT output. CAUTION! Do not exceed power levels. Damage to power transistors and inability to achieve 100% modulation from insufficient audio power will result. |
VR14 |
Set
RF PWR to MAX. adjust for 10 watts |
|
VR18
|
Set
RF PWR to MIN. Adjust for 1-2 watts |
||
| RF
METER: Set mode to AM, RF Power control to MAX MIKE GAIN at minimum. |
Connect wattmeter to ANT output. |
VR9
|
Adjust so RF meter agrees with Wattmeter. |
| AMC:
Mode to AM. RF Power control to MAX. MIKE GAIN to maximum. Inject audio signal of 1KHz at 30mV to Mic input. |
Connect modulation meter to ANT output. |
VR16
|
Adjust for 100% modulation depth. |
| MODULATION
METER: Mode to AM. RF Power control to MAX. MIKE GAIN to maximum. Inject audio signal of 1KHz at 30mV to Mic input. |
Connect modulation meter to ANT output. |
VR15
|
Adjust so meter agrees with modulation meter. |
| FM DEVIATION:
Mode to FM MIKE GAIN to maximum. Inject 1 KHz, 30 mV audio signal at mike jack. |
Connect deviation meter to ANT output. |
VR5
|
Adjust for total deviation of 4.5 KHz. |
Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.