Dear Elecraft aficionados:
The symptom is KPA switching bands during Tx.
Seems like a while ago I was troubleshooting the RFI problem between the
equipment.
K3 + KPA500 + KAT500
Using the "enhanced" configuration where serial cable between the K3 to KAT to
KPA assisted in communicating band c
Before replacing cables or adding ferrites, I would make sure that all the
chassis are bonded together with short runs of heavy gauge wire. Differences in
ground potentials between equipment can make a mess of things.
For more info, get the book on grounding and bonding from the ARRL.
https://w
On 1/12/2024 12:18 PM, Jeff Wandling wrote:
Seems like a while ago I was troubleshooting the RFI problem between the
equipment.
Is everything in your home and your station properly bonded and grounded?
Is every chassis on your operating desk bonded together?
Is the operating desk common point
I am experiencing a new problem for me, with my KAT 500. So far I've
noticed this issue on 30M. I am using a dipole cut only for 30M with an SWR
of 1.2 to 1.3 max SWR across the band. I “trained the tuner” at 20khz
segments on 30M.
Setup is K4D, KAT 500 & KPA 500. Win 10 pc.
Running CW, I can sta
Paul,
Connect a dummy load in place of the antenna and repeat your testing.
This will eliminate the antenna as a possible source of RFI.
Report the results of your tests,
GL!
*Ken*
*WA2LBI*
On Fri, Jan 12, 2024 at 4:47 PM Paul Ecker wrote:
> I am experiencing a new problem for me, with my
On 1/12/2024 1:46 PM, Paul Ecker wrote:
Does this sound like a KAT 500 problem or maybe an RFI problem.
It sounds like a problem somewhere after the output of the power amp,
including all interconnecting cables, the feedline, and the antenna.
Common problems are loose connectors and/or adapte
Ken
With the KAT connected to a dummy load on the 30M port, I don't see the
problem re-occur. The SWR measured outside prior to entering the box with a
polyphaser is low. So some type of problem is between the KAT and the
connection box outside??
73 & tnx for help
Paul w2eck
On Fri, Jan 12, 2024
I would first check all connections. If you are running 500 w then any bad
connection can create your issue, not the amp.
Bill
K9YEQ
From: elecraft-boun...@mailman.qth.net on
behalf of Paul Ecker
Sent: Friday, January 12, 2024 3:30:16 PM
To: Ken Winterling
Cc
That sounds EXACTLY like an arc over somewhere past your KAT500. Could
be a connector, the coax, the connection to the dipole, or any similar
spot, but my bet would be the connection to the connector or the
connector itself.
Dave AB7E
On 1/12/2024 2:46 PM, Paul Ecker wrote:
I am experi
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It sounds like a bad connection or arc-over in a connector, cable,
balun, etc. after the KAT500. I had a similar issue that drove me nuts
for weeks until I found a corroded solder connection in a balun at the
feedpoint of an antenna. It does not sound like an RFI issue.
73, Victor, 4X6GP
Rehov
It's possible that something is arcing and, of course changing the tuning.
Do you have the internal tuner in the K4? If so, does it behave the
same way?
Why do you have the amplifier running? 30m is as restricted power band.
If you leave the amp and tuner out of the circuit and transmit wi
Thanks to all for the advice and suggestions. Will be out of pocket for a
day or so, but you have given me lots of areas to checkout and
troubleshoot. Will let you know what I find out.
73 Paul w2eck
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Home: http://
Good advice
Bill
K9YEQ
From: elecraft-boun...@mailman.qth.net on
behalf of Ken WA8JXM
Sent: Friday, January 12, 2024 5:52:52 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT 500 Loses Match
It's possible that something is arcing and, of course chang
I just realized you said 30m. Why are you running the amplifier ("max
power") on 30m??
Dave AB7E
On 1/12/2024 2:46 PM, Paul Ecker wrote:
I am experiencing a new problem for me, with my KAT 500. So far I've
noticed this issue on 30M. I am using a dipole cut only for 30M with an SWR
of 1.2
Greetings,
I joined this list today, after sending a message to Elecraft support,
describing a similar problem. I have an Icom IC-7610, with the KPA500
and KAT500, and my SWR spontaneously climbs into the red sometimes
during transmissions. It takes some effort to correct it, and I
typicall
Your situation sounds like 1) something is heating up and changing value
or 2) something is arcing and changing value. Are you using a balun or
choke that is underrated?
Ken WA8JXM
On 1/13/2024 12:28 AM, Michael Reynolds, NO6O wrote:
Greetings,
I joined this list today, after sending a mes
I have a CHA-250B antenna, but it is not currently up. This antenna is only
rated for 250W SSB which is probably 100W on CW or a digital mode. I think
this antenna has a matching network and at higher powers will saturate the
cores causing SWR to rise out of control. Same thing happens for me with
The only thing that has a flat 1:1 SWR from 80m to 6m is a good quality
dummy load.
Dave AB7E
On 1/12/2024 10:28 PM, Michael Reynolds, NO6O wrote:
Greetings,
I joined this list today, after sending a message to Elecraft support,
describing a similar problem. I have an Icom IC-7610, wi
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