Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
answers and for providing the schematic information.
I pulled the unit and did some poke and prod testing with a DVM here
on the
anti-static mat. My fear was that K18 had a bad contact in the ANT1
position. -Not!-
What had apparently happened was that I had a batch of the offshore made
"Amazon Special" PL-259s that appear to have a slightly oversize
center pin.
The patch cable used until recently had one of them on one end. It had
spread the leaves on the ANT1 SO259 just enough that a good
connector, when
perfectly centered and seated, did not make contact! Gentle
recentering of
the leaves with a miniature flat blade screw drive yielded relief and a
self-administered head smack.
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services
-----Original Message-----
From: kirk.hard...@k6kar.com <kirk.hard...@k6kar.com>
Sent: Sunday, July 11, 2021 14:07
To: kd...@frawg.org
Subject: RE: [Elecraft] KAT500 ANT1 problem
Jack,
The KAT500 schematic is on line (partial)
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
Although all schematics aren't available, this may be enough to get
you
going.
73,
Kirk, K6KAR
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
<elecraft-boun...@mailman.qth.net> On
Behalf Of kd...@frawg.org
Sent: Sunday, July 11, 2021 12:38 PM
To: Elecraft@mailman.qth.net
Cc: 'Elecraft Support' <supp...@elecraft.com>
Subject: [Elecraft] KAT500 ANT1 problem
All,
This is likely something very straight forward, but I do not have a
schematic to follow and troubleshoot.
Symptom: ANT 1 circuit seems to be dead. No match and fault on switch
from
ANT2 to ANT1. No receive signal.
Tests:
Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
match normally with rig's internal ATU.
With KAT500 back in line, selected each tuning position (AUTO, MAN,
BYP) no
difference
With KAT500 still in line, ANT2 and ANT3 work nominally.
Checks:
Reset to factory defaults, restored last working Configuration, no
change in
above behavior.
If I was a betting guy, I'd guess a relay or switching diode was open,
however - no schematic, don't really know.
Did I miss something
Does this little beastie need to go back to the mothership?
Thanks,
Jack Spitznagel - KD4IZ
Science River LLC
Biomedical Consulting Services
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