[Elecraft] kpa100 causing K2 to be low on TX freq?

[Don Wilhelm]

John,
From your numbers, it appears that your TX frequency is 1 kHz off - that is
quite a bit.
I would recommend that you first check to see if your BFO is on the correct
side of the carrier.  Assuming a 500 Hz BFO offset, the transmit frequency
would be off by 1 kHz. This would be for CW
If the offset you are seeing is in LSB - look for something creating a
steady 1000 Hz tone - the carrier frequency should be pretty well nulled in
LSB, and you may be reading a carrier minus audio tone on your frequency
counter.

In addition, the KPA100 does introduce a mettalic shield between the base K2
and the amp.  I would think that the shield could possibly introduce a
shift, but it should be seen in both the transmit and receive frequency.  I
recall that the frequency will not be correct if CAL PLL is run with the
bottom cover removed.

That is the best guess that I can come up with right now.

73,
Don Wilhelm  - Wake Forest, NC   W3FPR home page: http://www.qsl.net/w3fpr/
  QRP-L # 485   K2  SN 0020   mailto: w3fpr@arrl.net

*** Life is what happens when you're making other plans -- Mike Cross  ***

----- Original Message ----- >
>
> That wasn't it.  I don't know what it is.  The K2 internal freq counter
> shows 12100.01, my external freq counter shows 12100.0102, I've re-run CAL
> PLL but when I'm TX on 3875.97 with the K2, the signal is actually at
> 3874.97.  I realize that this only a fraction off but, it would be nice if
> we could get it closer to dead-on.
>