Yes, I remember reading about seating the caps. So I gave those two about 20
spins and did not help.
The radio seems to peak OK going through the alignment. Just seems to have
no sensitivity. I just pulled out a TenTec RX-320 and a S-9 singal on the
TenTec is only a single bar on the K2. I have to crank the audio almost all
the way up to listen as well.
I doubt in my case it is tinning problems. I am prone to do stupid things
but I am pretty good with solder and removing the enamel on the wire. NOT to
say it isnt possible.
I am surprised I did not notice this before but as I said, I am never on 20.
Its a significant difference in audio as you switch to 20.
Just to be safe I will check "trace to trace" on the circuit board to make
sure the torroids are making good contact :)
73,
Rich
----- Original Message -----
From: "Ron D'Eau Claire" <[EMAIL PROTECTED]>
To: "'Rich McCabe'" <[EMAIL PROTECTED]>; "'Elecraft Reflector'"
<elecraft@mailman.qth.net>
Sent: Saturday, October 30, 2004 7:54 PM
Subject: RE: [Elecraft] 20 meter problem on new K2
Did you "seat" the band pass filter trimmer caps, Rich?
Many of those trimmer capacitors come from the factory needing to be
twirled
around a number of times to "seat" them so the sliding contact has
electrical continuity. Just put your screwdriver in the slot and twirl it
around a bunch of times, then re-try the alignment procedure. That CAN
happen after the rig has been successfully aligned once. Apparently the
contacts need a little 'exercising' to make them seat completely. Once
that
is done, they are fine. There's nothing wrong with the trimmers.
That's the most common reason for a dead band, right up there with perhaps
a
dreaded PTTL (poorly-tinned-toroid-lead). Normally a PTTL won't make the
rig
quit though. It won't work from the first.
If you didn't get ALL the enamel burned/scraped off of a toroid lead or
you
pulled the lead through the board passed the tinned segment so
enamel-covered wire was in the hole, you might not be making electrical
contact on that lead.
Leads that aren't tinned properly look fine when soldered unless you look
VERY closely at the wire. You'll often see a tiny ring of dark that looks
like rosin around the conductor. It's actually the enamel. In that case
the
wire is "trapped" in the solder blob and won't pull out, but it isn't
making
electrical contact either.
Ron AC7AC
-----Original Message-----
I just noticed that my K2 build 43xx is almost totally dead on 20 meters.
I
think all the other bands are OK.
I hooked up my N-Gen and could not hear anything on 20. I thought I could
use a scope to follow the generators noise signal but the scope makes
about
as much noise as the generator when going through the bandpass circuit.
I am guessing it is probably bandpass or low pass and I need to start
checking to make sure the relays are making contact, etc.??
It worked when I built it a couple months ago and am not sure when it quit
as I dont use 20 often. This K2 is totally optioned and I have removed
the
100 watt PA to make sure it is not the culprit.
Any comments on the best way to trouble shoot this?
Thanks and 73,
Rich
kd0zv
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