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Galaxy DX-959 Mods - Clarifier/Frequency Counter Realignment | Radioaficion Ham Radio

Galaxy DX-959 Mods - Clarifier/Frequency Counter Realignment

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Galaxy DX-959 Mods
10kc Switch Modification
Clarifier (Unlock) Modification
Clarifier/Frequency Counter Realignment
Microphone Wiring Pinouts
Frequency Roadmap
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Clarifier/Frequency Counter Realignment:

It may be desirable to realign the clarifier position to better track with the frequency counter. Once the clarifier has been unlocked it will typically sit "on frequency" at about the 9 or 10 o'clock position. If this is undesirable, it may be reset so that the clarifier is at 12 o'clock.

1. Set radio to channel 20 (27.205).

2. Set clarifier on radio to 12 O'Clock position.

3. Remove the bias jumper board that connects TP7/TP8/TP9.

4. With the radio in AM receive mode, adjust L20 for reading of 27.205.

5. With the radio in USB receive mode, adjust L21 for reading of 27.205.

6. With the radio in LSB receive mode, adjust L22 for reading of 27.205.

7. With the radio in LSB transmit mode, adjust VR7 for reading of 27.205.

8. Replace the bias jumper board that connects TP7/TP8/TP9.

*Note: Adjusting step 6 should automatically adjust the same frequency in step 7 if the clarifier is unlocked. This won't replace a complete alignment, but it's pretty close.

(A good 6-digit external counter should be used in conjunction with the above procedure so that the external counter reads 27.2050, and the 959's built-in counter reads 27.205 with the clarifier at 12 o'clock).

~Thanks to Road Hog (Vinnie) RTDX422 for submitting this fix!~

~Update~
A more precise calibration/alignment method has been shown to work better than the one above (which still works, but this one is recommended).

1. Set radio to channel 1 (AM mode).

2. Set clarifier on radio to 12 O'Clock position.

3. Connect frequency counter to TP3.

4. With the radio in AM receive mode, adjust L20 for reading of 16.27000MHz  ±20Hz.

5. With the radio in USB receive mode, adjust L21 for reading of 16.27250MHz  ±20Hz.

6. With the radio in LSB receive mode, adjust L22 for reading of 16.26750MHz ±20Hz.

 

“VR” Tuning & Alignment Components:

AM Power                                         VR14  
AMC (AM modulation)                     VR16
SSB ALC (Sideband mod)             VR13
SSB APC (Sideband power)          VR17
SSB Carrier Balance                       VR6
RF Meter Adj.                                    VR9
S Meter Adj. (AM)                             VR1
S Meter Adj. (SSB)                           VR2
Squelch Threshold Adj. (AM)           VR4
Squelch Threshold Adj. (SSB)         VR3