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9 MHz crystal




 
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« on: October 24, 2019, 08:16:23 PM »

The 9 MHz crystal of my Ten Tec Corsair 2 is starting to give trouble, after heating up it jumps approx 150 Hz. Anyone knows where to find one?
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WD5JKO
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WD5JKO


« Reply #1 on: October 24, 2019, 09:11:13 PM »


Nico,

   The Central Electronics 10A/B and 20A uses a 9 mhz crystal.

Those crystals from the CE rigs have a lot of warm up drift (maybe 600hz?), and sometimes will shift suddenly 150 hz or more as the surrounding ambient heats up.

I tried several 9 Mhz crystals, and the best was still unusable with today's "channelized" frequencies where 150 hz is like being "your drifting out of the band man".

I ended up getting a larger size CB Channel 4 Transmit crystal, 3rd Overone:

26.98500    CB Channel 03    
27.00500    CB Channel 04    

I got a NOS crystal on Ebay. It too had a warm up drift, but no jumping.

I ended up mounting the crystal in a 4 terminal square crystal oven with a 6V bi-metalic thermostat heater.

Now after about 3-5 minutes after power up, the crystal is solid...no drift.

Jim
Wd5JKO
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #2 on: October 25, 2019, 11:19:18 AM »

That a good idea Jim, thanks a lot. I will look for these crystals.
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