[Elecraft] K2 intermittent problem

[Don Wilhelm]

Igor,

Did you receive the email I sent yesterday?  The content is copied below:
---------------------------------
I would suggest making another attempt with the K2 set to receive on the 
FL1 filter (the same filter as used for transmit).

If you still have the shift between TX and RX, the problem is most 
likely in the way the the sidetone shift offset is being handled (Wayne 
would have to answer that situation, I do not have a clue to what goes 
on inside the firmware)

However, if the shift is absent with that setup, you can solve the 
problem with the BFO settings for the filter.
---------------------------------

73,
Don W3FPR

On 4/24/2012 11:58 AM, Igor Sokolov wrote:
> Did it with well aligned and checked K3 in CW mode plus external frequency
> counter.
> Transmit on K2, receive on K3 tuned to the same pitch as set in the menu.
> Then TX on the K3 RX on K2. TX frequency in both cases checked by the
> external counter. TX frequency is always higher then RX. The worst case is
> on 28 MHZ where it is 260 Hz.
> Do you have any ideas Don?
>
> 73, Igor UA9CDC
>
> ----- Original Message -----
> From: "Don Wilhelm"<w3fpr at embarqmail.com>
> To: "Igor Sokolov"<ua9cdc at gmail.com>
> Cc: "Elecraft Reflector"<elecraft at mailman.qth.net>
> Sent: Monday, April 23, 2012 11:48 PM
> Subject: Re: [Elecraft] K2 intermittent problem
>
>
>> Igor,
>>
>> What mode?  How are you determining that the TX and RX frequencies are
>> different?
>> There should be no difference in SSB, and in CW the difference should be
>> equal to the sidetone pitch.
>>
>>   73,
>> Don W3FPR
>>
>>
>> On 4/23/2012 1:23 PM, Igor Sokolov wrote:
>>> The problem was finally tracked down to X3,X4 crystals. Changing one of
>>> them
>>> (only one was found in a local shop) cured the intermittent frequency
>>> change. BFO frequency range is within the accepted limits (a bit more
>>> then
>>> 3.6 kHz). VFO linearization and CAL FIL is done. Now I have  another
>>> problem. TX and RX frequencies do not coincide. The difference is band
>>> dependant. It is 30Hz on 80m and 260Hz on 28 MHz. Although the radio is
>>> usable with engaged RIT (OR XIT) I would like to cure the new problem.
>>> Can somebody root me in the right direction please
>>>
>>> 73, Igor UA9CDC
>>>
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