Frequency trim - crystal stability?

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GM3ZZA
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Joined: Sun Feb 21, 2016 10:31 pm

Frequency trim - crystal stability?

Postby GM3ZZA » Sat Feb 27, 2016 9:34 pm

When I connected the RSP to a real antenna rather than the wet string I had been using...

I tuned to RWM at 9.996 MHz frequency reference. I recorded it was 51 Hz out. So I set the trim to +5.04 ppm.

Used the frequency trim facility to change. Listened to RWM at 14.996 MHz. Slightly out again.

Then after leaving the RSP on for about an hour I noticed that a 15.000 MHz signal I was listening to, but not identified, had drifted slightly. then went back to RWM at 9.996 MHz.

I found that I now had to set the trim to +4.41 to match the 9.996 MHz RWM signal.

So I presume that the crystal drifts a bit with temperature, and therefore this is OK.

73 Phil GM3ZZA
Last edited by GM3ZZA on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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