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Ultimate3 QRSS kit - page 9

Ultimate3 QRSS kit - keep cool

 

To prevent drift and other stability problems, Hans wrote that it would be a good idea to add a small heatsink to the crystal of the DDS. Unfortunatly I didn't have any low profile heatsinks laying around. My local component supplier (Explorer Elektronica in Almelo) has a large collection of these things and also special thermopath adhisive stickers to mount them. These heatsinks are made for large CPU's (40 pin dill) but a few strokes of the iron saw and some grinding made a perfect one.

 

 

Also I cut a small part for the PA fets (I mounted 2 extra) and used the same adhesive pads.

 

 

The settings I'm using for this moment :

 

• [0] 5 07,040,180 WSPR 23 0
• [1] 3 14,097,180 WSPR 23 0
• [2] 1 24,926,180 WSPR 17 0
• [3] 0 28,126,180 WSPR 20 0
• Speed 005
• Message TEST DE PH2LB
• Callsign PH2LB
• Locator JO32
• FSK Fine Hz 0 004
• Frame Start 10 00
• GPS Mode Baud 2 009,600
• CAL HP Time 00 010
• Park Mode Freq 0 20,000,000
• Sys. Frq. 19,997,450
• Ref. Frq. 125,000,460

 

LPF filters in slots 0..5 : 10m, 12m, 15m, 20m, 30m, 40m

 

These new settings seem to make it work nicely. Drift is now most of the time 0 and sometimes +1 of -1 on the 10m and 12m.

To be continued . .. . . . . (test in progress)

Continue reading on next page page 10 - PA

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