The exact dial frequency where you hear the tone can vary slightly
depending on the frequency of the HFO crystal oscillator. A 500Hz error
in the HFO would place the spurious 1kHz from where it was expected.
My proposal was to inject a 9MHz signal at connector 71, not a 21.320MHz
signal. You are trying to balance the mixer for signals at the **IF**.
Good luck,
Steve G3TXQ
On 29/12/2012 01:14, K4MT wrote:
Thanks Steve:
I only hear a tone at 21316 and not 21320. Why it is not in the correct spot if
that is even it is unknown to me.
I discovered I could dip it out to almost nothing but the adjustment does not
work as I would expect. There are two dips on the larger capacitor. Logic
would tell you one of them must be the correct dip. But when you use those dips
the pot has no effect at all. I found the correct spot is close to the deeper
of the two dips. You dip it and come back just out of the dip and find the spot
where the pot starts to dip the tone. You then bounce between the pot and the
two caps for the best dip. After doing that I could barely hear the tone and
RX sensitivity was still normal.
I will try injecting a 21320 as you suggest to make sure I have the balance
adjusted at the right frequency.
Thanks,
Gary K4MT
--- On Thu, 12/27/12, Steve Hunt <steve@karinya.net> wrote:
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