Galaxy DX Radios DX979
Documentation Project
CBTricks.com
Clarifier Mod

NOTE:
As with any mod exercise a great deal of care !!!!
Due to the placement, size, and close proximity of the surrounding traces.
If done wrong you could destroy the PCB or components.

If you have even the slightest doubts or the proper equipment , it would be wise to have someone else you trust perform the mod for you.
SO TAKE YOUR TIME AND DOUBLE CHECK YOUR WORK!!!!

 

Looking at the front edge of the main PCB on the copper side .

Remove D68 and R113 then run a wire from the bottom of J9 as shown above.

Do a complete VCO alignment.
You should now have 1khz down & 1khz up slide on transmit from center slot

 

SETTINGS CONNECTION
ADJUST
 ADJUST FOR

VCO:
Disconnect 'short PCB' from TP7, TP8 and TP9.
Set radio to CH 1 AM RX mode.

Clarifier setting in 12 o'clock.

Connect Multi-meter to TP2.




Oscilloscope to TP3.

Connect Frequency Counter to IC3 Pin 8.
L14

L15

VC1
 2.5 VDC ± 0.1
Adjust for 2.6 VDC ± 0.1



Adjust for max.

10.2400MHz ± 20Hz
AM Frequency:
Set radio to CH 19 AM RX mode.		 Connect Frequency Counter to TP3.
L20
 16.4900MHz ± 20Hz
USB Freq:
Set radio to CH 19 USB RX mode.		 Connect frequency counter to TP3.

L21

16.4925MHz ± 20Hz
LSB Freq:
Set radio to CH 19 LSB RX mode.		 Connect frequency counter to TP3.
L22
 16.4875MHz ± 20Hz
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Disclaimer: Although the greatest care has been taken while compiling these documents,

we cannot guarantee that the instructions will work on every radio presented.