Galaxy
DX Radios DX88HL
Documentation Project
CBTricks.com
PLL Alignment
See Required
test equipment
See Alignment
Locations
| SETTINGS | CONNECTION |
ADJUST
|
ADJUST FOR |
| 10.240
MHz PLL REFERENCE: RX Mode, AM, Freq. to 26.965MHz Band E Fine and coarse clarifier control to center detent. Remove TP7-TP9 jumper PCB. |
Connect Frequency counter to IC5 Pin 4. |
|
Check
for 10.2400MHz ±200 Hz. If tolerance is beyond this, replace X1 (10.240MHz). |
| VCO
BUFFER: RX Mode, AM, Freq. to 26.965MHz Band E Fine and coarse clarifier control to center detent. |
Connect scope to TP3 (top bare lead of R74) |
L18 |
Adjust for max. RF (0.80V p-p typical). |
| Connect scope to L22 secondary (bare lead of L50 ). |
L22
|
Adjust for max. RF (2.0V p-p typical) | |
| VCO: RX Mode, AM, Freq. to 26.965MHz Band E Fine and coarse clarifier control to center detent. |
Connect
DC voltmeter to TP2 (top bare lead of R116) |
L17
|
Adjust
for 3.20 VDC ±0.1 Vdc. Recheck at 25.165MHz for approx 2.0V. and 28.755MHz for approx 6.0V. |
| PLL
OFFSET OSCILLATOR: RX Mode, AM, Freq. to 26.965MHz Band E Fine and coarse clarifier control to center detent. Modes as indicated. |
Connect
Frequency Counter to TP3 (top bare lead of R74). |
L19 |
AM: Adjust for 16.2700MHz ±20 Hz. |
|
L20
|
USB: Adjust for 16.2725MHz ±20 Hz. | ||
|
L21
|
LSB: Adjust for 16.2675MHz ±20 Hz. | ||
| FREQUENCY
COUNTER: Set mode to AM Freq. to 26.965MHz Band E |
VC1
on Counter PCB
|
Adjust VC1 on counter PCB for 26.965Mhz on display. |
Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.