Knut,
Do you have a power loss on some bands that is not cured with a TX Gain
Calibration?
Have you measured the receiver MDS and found it to be lacking from the
last time you measured it?
If the answer to both those questions is "NO", then the answer is that
it does not need any alignment.
Older tube rigs may be a different matter, but modern components are not
as prone to value changes with age as they were "back then".
This applies to any transceiver, and is not particular to the K3 or any
other one transceiver.
I have serviced K1s and K2s K2s that I had fully aligned and calibrated
several years before, and find them still in perfect alignment (although
I do go through the alignment procedures on those I service again just
as a check).
Unless you have adequate instrumentation, I would not attempt it.
It would be simpler to send your K3(S) back to Elecraft than to attempt
it yourself - by the time you obtain adequate instrumentation, you will
spend more money on the project than a trip to Elecraft.
Then you mention the other problem - lack of full instructions. Those
are not available for the K3(S). Elecraft has automated testing lines
set up to do that job.
73,
Don W3FPR
On 6/3/2018 4:53 PM, ab2tc wrote:
Hi,
Very recently there was the same question asked about the K1. I don't recall
any mention of this topic on the K3 on the reflector. It has internal
trimmers on the per ham band HF filter. Is it advisable to occasionally
touch these up? I have no reason to believe that my oldest K3 (ser#82) is
out of alignment, but I'd like to be ahead of the game. I am old enough to
have used tube rigs in my early ham career and they definitely needed
occasional tune up. The narrow band ham band RF filters in the K3 have
relatively high Q so the slightest component drift will quickly affect the
shape of the filter curve.
If the answer is affirmative, could we get a procedure for doing it
properly? Tuning for max signal at the center frequency may not produce the
proper shape of the bandpass filter (flat top for the required bandwidth). I
know from my previous career as an RF engineer that tuning LC bandpass
filters can be tricky.
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