Re: {Collins} BFO x-tals off frequency



Good Morning, I guess that I am surprised that this error would make much of a difference. Especially when the PTO shift between R and T addressed by the Viet Nam Zener was typically an uncorrected 100 Hz or more, how do you see this manifesting an issue in operation? Ted WA8ULG


On 10/26/2016 8:14 AM, Ken Kaae wrote:
International Crystal has them in stock.

ken
ke7yd


On Oct 25, 2016, at 11:57 PM, Peter Ravn <fasan5@xxxxxxxxx> wrote:

In my KWM-2 the BFO x-tals are a bit off frequency. The USB x-tal is 456.370
kHz, the LSB-tal 453.681 kHz, so the x-tals are 20 Hz off in USB and 31 Hz
off in LSB. I tried to pull down the x-tals by mounting a small 10 pF
trimmer across each x-tal. With the trimmers at absolutely minimum capacity
I managed to pull the frequency a few cycles before the BFO stopped
oscillating. Any other way of the pulling the x-tals?

Peter OZ8CTH





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