16589Re: Daughter board on SR 15/17m
- Dec 1, 2007Hi Jose,
> Paul I do not have the crystal for 17m howeverFor 15m operation only, I'd recommend tuning
> i do have two crystal for 15m 28060 and 28224.
> What would be the recommended tuning frequency
the tank with the 1000 pF capacitor across the
selected crystal to about 3*28150 = 84450 kHz
within about 500 kHz.
I suppose you could also probe one of the 74AC74
outputs and then you would be looking for about
21100 kHz within about 125 kHz.
> I'm afraid some transistor is again not working62 MHz with the capacitor is too low. I'd guess
> because I get 48000 to 50000 not stable and
> 62000 with the 1k capacitor.
you will have to take a turn or two off the inductor
before you can tune it to 84.45 MHz by moving the
turns about on the core.
Hopefully after that, the frequency will be stable
with the crystals that you have.
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