Fixed! A year of looking at solder joints, and flowing a few, did not
fix the problem. I recently ordered and replaced L33 and the two BFO
crystals. The three parts fixed the problem! Replaced L33 so that I did
not need to worry about breaking the fine wires when removing the old one.
John KN5L
O
Performed another test today, last night I aligned 200 Hz CW normal to
04913.08, First power up this afternoon 04913.21, after one hour warm up
(no transmitting) 04913.10.
John KN5L
On 07/24/2013 12:39 PM, John Oppenheimer wrote:
> Hi Don,
>
> My question is directed specifically at the CAL FIL
Hi Don,
My question is directed specifically at the CAL FIL BFO frequency being
100 Hz different between cold and warm. As mentioned, because the BFO
frequency is off by 100 Hz, the 200 HZ filter is unusable because a
properly received pitch will place the signal on the filter skirt.
This K2 seri
John,
The specified stability for the K2 is less than a 100 Hz drift from a
cold start at 25 degC, so your K2 is within the specification (granted
it is just on the border). The drift will usually be worse for a K2
with the KPA100 installed than a basic K2 because there is more heat
generate
My K2 has a 100 Hz difference in CAL FIL frequencies between cold and
full warm up. The 100 Hz difference renders the 200 Hz BW unusable until
the K2 warms up.
Is this typical, or do I have a component with excessive temperature
instability?
John KN5L
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