Fw: [Elecraft] K2 Tuning VERY STRANGE...

[Jerry Ford]

Ron:

Did you do the VFO calibration after the firmware update?
Go to Elecraft web page,  K2 info,  bottom of the page,  firmware
update,   summary and click on the pdf for detail on VFO calibration
required after firmware update.
VFO response is a problem after the update if you haven't done the
calibration along with it.

Good luck:          Jerry
----- Original Message -----
From: "Ron D' Eau Claire" <rondec@easystreet.com>
To: "Elecraft List" <elecraft@mailman.qth.net>
Sent: Sunday, February 24, 2002 5:57 PM
Subject: [Elecraft] K2 Tuning VERY STRANGE...


> Help!
>
> Recently I FINALLY got around to installing the Rev. 2 firmware in
my K2
> (S/N 1289).
>
> Right away I noticed that the tuning acted very odd. It seemed to
take
> FOREVER to tune across the band. The faster I twirled the knob, the
slower
> it seemed to tune!
>
> Finally, today, I did some tests, and my perceptions were right.
When I turn
> the tuning knob faster, the K2 changes frequency more slowly! Here's
how I
> tested it:
>
> I set the tuning rate at 10 Hz on 40 meters and tuned my K2 to
exactly
> 7000.00 kHz. I s-l-o-w-l-y tuned upwards, turning the knob exactly
10 turns
> at a rate of about 1 turn per second (as indicated by a marker I
attached to
> the knob so I could count the turns accurately). The frequency now
read
> 7010.06 kHz. Fine.
>
> I set the tuning back to exactly 7000.00 kHz. Now I very quickly
turned the
> knob ten times exactly. Now it only tuned up to 7.006.41 kHz.
>
> I repeated the experiment a dozen times to be certain that I was
turning the
> knob exactly 10 turns every time. I was and the results were
consistent.
> When I turned the knob more quickly, the K2 changed frequency more
slowly!
> There was some variation. At the faster rate of turning the knob it
ended up
> between 7004.41 and 7006.92 kHz.
>
> It's as if the uP is not able to read the optical encoder correctly
at the
> higher tuning rates.
>
> One other important point. I violated a cardinal rule of messing
with
> equipment; I changed two things at almost the same time. The day
before I
> put the new firmware in, I also did the mod Wayne requested of those
of us
> who had been having trouble with the K2 spontaneously QSY'ing in
transmit.
> It was supposed to keep the Optical Encoder "live" at all times.
>
> So I can't say for certain which mod might be responsible.
>
> Has anyone else noticed this?
>
> Ron AC7AC
> K2 # 1289
>
> _______________________________________________
> Elecraft mailing list: Elecraft@mailman.qth.net
> You must be a list member to post to the list.
> Postings must be plain text (no HTML or attachments).
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com