Problem #2 Solved
While waiting for replacement boards, I started looking again. The
problem was not on the mixer board as suspected, it was found on the
Synth board. Because of the close proximity of the mixer board to the
synth board, any movement in the immediate area caused to problem to
come and go. A 150 ohm resistor on the bottom of the synth board was
not soldered on one end. The lead was resting against the solder
joint of one leg of L6. Lead soldered, problem cured.
Picture of unsoldered component. Lead near C69.
copy this link to browser. I get mail rejects if I put the entire
link in the mail.
00497f5.netsolhost.com/radio/k3synth1.JPG
If you have or suspect intermittent s3 to s9 plus noise, it's worth a look.
One down, two to go. Still awaiting for replacement boards from
Elecraft ( 9 days so far)
At 09:54 AM 02/03/08, John wrote:
Has anybody on the list seen either of these problems. This is a
copy of what I sent to the service dept.
received K3/10 kit on Feb 28, Ser#501.
Assembly went well. I have assembled two K2's and a K1 with no
problems. I used an anti static mat and wrist band throughout assembly.
Problem#1
Upon power up, the K3 will not recognize the KAT3. I receive the ERR
IO1 msg. I removed the KAT3, powered up and did not get the ERR IO1
msg. Reinstalled the KAT3, power up, get the ERR IO1 msg. I went
through the configuration steps, no help. I tried switching between
ant 1&2, and received a ATU not installed msg. Assume a faulty KAT3?
Problem#2
This one is a booger. I have a horrible S8 to S9 plus noise (sounds
like line noise), at various places throughout the 1.8 to at least
25 mhz. It shows up on the 160 thru 40 hams bands, misses 30M, shows
up again on 20M and 17M, misses 15M, shows up on 12M, clean on 10
&6M. Using a non metallic tuning tool, if I put pressure on the
little mixer board I can cause it to go away or change. The
sensitive area is the component, looks like a transistor, three
leads, that looks like a pop rivet in the center. lower left on the
board when looking in from the front. I can't read a component
number on the board. If I put pressure on this component I can cause
the noise to go away, or shift off the freq I'm listening to. I
removed, inspected, and reinstalled the mixer board a couple of
times, no change. The noise must be being generated prior to the
roofing filters because changing the filters has effect on the
noise, DSP does too.
There are no external antenna connections, the only connection to
the K3 is the power. The PS is a Astron and it powers my K2's and
K1, so it's not PS noise.
If you want, I can phone you and let you listen to the noise.....
Did I get the lemon?
John
k7up
K3, almost, maybe
K2's 2012, 2223
K1 637
Things are more like they are now then they've ever been before.
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