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Title: 9 MHz crystal Post by: PA0NVD 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?
Title: Re: 9 MHz crystal Post by: WD5JKO 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 Title: Re: 9 MHz crystal Post by: PA0NVD on October 25, 2019, 11:19:18 AM That a good idea Jim, thanks a lot. I will look for these crystals. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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