Are you seeing and * on the KPA500 screen when using the IC-705 and the
amp is in Operate mode? If so, the amp is being keyed while the IC-705
is in receive mode. Confirmed by the fact when the amp is in STBY that
signals are normal.
Check your amp keying interface and cable wiring. You should be able to
prove and Amp Key command from the IC-705 to the KPA500. Thus when the
IC-705 is keyed, likewise the amp.
73
Bob, K4TAX
On 3/31/2022 6:35 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 17
Date: Thu, 31 Mar 2022 11:52:29 -0600
From: James Bennett<w6...@mac.com>
To: Elecraft Reflector Reflector<elecraft@mailman.qth.net>
Subject: [Elecraft] KPA500 Issue
Message-ID:<f2a101bc-7f8e-4621-8e85-ddb24136f...@mac.com>
Content-Type: text/plain; charset=utf-8
Having an issue with my KPA500 and a non-elecraft radio. I?ve got an Icom
IC-705 connected to my KPA500 and KAT500. By dropping the 705?s output power to
4 watts and pressing Tune on the KAT500 with the amp in OPER mode, I?m able to
get the tuner to give me a good match on just about all bands to my Zerofive
Flagpole Vertical. Then, turning the power level up to max (10 watts) on the
IC-705, the amp gives me anywhere from 210 to 250 watts output, depending on
the band. And that?s fine for me right now.
However, what I?m seeing is that when the amp is in OPER mode, my receive
signal strength drops way, way off to the point I have to go full AF volume to
hear signals. If I put the amp in STBY, signal levels go back to normal. I also
notice that the amp fan doesn?t take too long to crank up to high speed, and
the PA temp is sitting around 67 C.
I also have a K3. When I power up the K3 and switch the antenna over to the K3
on the same band as the IC-705 - there is no drop in signal level on it when
switching between OPER and STBY on the amp. And, yes, when I?m using the
IC-705, I press the corresponding BAND button on the amp.
OK - some further info: if I have the K3 sitting on the same band as the IC-705
this does not happen - going from STBY to OPER on the amp makes no difference
on receive level on the IC-705. But if I power off the K3, the IC-705 reverts
to its partially-deaf state.
Somewhere long ago in a far distant galaxy, I recall Jack W6FB mentioning that
the K3 pulls some signal to zero when it is powered off. I suspect that may be
what is happening here but for the life of me I can?t recall the exact
conversation. I?d like to get to the point where I can run the IC-705 with this
tuner and amp without having the K3 in the equation, as the K3 will be going on
the sale block in the near future, in anticipation of a K4D delivery.
Any ideas? Jack - are you listening?:-)
Jim / K7TXA
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