Scott - what is your 1500 s/n?
Eric
/elecraft.com/
On 12/17/2019 1:04 PM, K9MA wrote:
Hi Eric,
I was able to tighten those screws a little, but it made no difference. Adding
ferrites to the control cable near the PS helped slightly, suggesting that
that is the source. The RF is definitely being received by the antenna, about
100 feet away: its strength depends on the antenna direction, and it is at
least 7 dB weaker with a dummy load.
I have submitted a request to tech support.
73,
Scott K9MA
On 12/17/2019 13:44, Eric Swartz - WA6HHQ, Elecraft wrote:
Hi Scott,
We have seen this in rare cases on a few 1500s. It appears to be caused by
the ground connection between the rear RF INPUT SO-239 flange and the chassis.
Very slightly loosening (not too far!) and then firmly re-tightening all four
screws on this SO-239 connector will insure a good ground connection between
this connector and the rear panel. (There are lock washers between the nuts
and the SO-239 inside.)
If the screws are loosened too far, you may have to remove the bottom cover
of the amp to hold the interior nuts in place while you re-tighten the four
screws. (Make sure the 50V power and control cables are disconnected when
you remove any covers on the amp.)
73,
Eric
/elecraft.com/
On 12/14/2019 1:43 PM, K9MA wrote:
I guess it just shows how little I've been on 10, but I've had the KPA1500
for over a year now, and I just noticed that when I turn it on, my noise
floor on 10 goes up about 3 dB. (And that's from an urban noise floor.) It's
pretty flat over much of the band, not typical switching supply noise. Has
anyone else experienced this and found a cure? (Other than using the old amp
tube.)
73,
Scott K9MA
--
Scott K9MA
[email protected]
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