[Elecraft] [K2] CAL FIL Temperature Sensitivity Question
John Oppenheimer
john at KN5L.net
Wed Jul 24 18:02:46 EDT 2013
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 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 serial number is above 7K
>
> The test is: Multi hour warm up, enter CAL FIL, measure and record a
> filter BFO frequency. Next morning, cold start, perform same measurement
> as above and compare the difference between the two BFO readings.
>
> John KN5L
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