I’ve seen no mention of modeling and/or measurements performed on any of these
antennas to see if they are within the match range of the KPA1500.
Jim ab3cv
On Sep 4, 2020, at 2:29 AM, Victor Rosenthal 4X6GP wrote:
I had an interesting experience trying to use a balun in a very demanding
I had an interesting experience trying to use a balun in a very
demanding situation. I'll describe it, and at the end I have a question.
Antenna was a dipole with total length of 10m fed with approximately 480
ohm open-wire line. Line length was 10m. I was trying to use this
antenna on 40m
I do the same Rick. However, when new firmware comes out, I update my
manuals appropriately. Elecraft allows that, unlike Icom, Kenwood, or
Yaesu. I wonder why?
Refreshing my own "firmware" is much more challenging, especially for things
not refreshed by use. Many questions on this reflector
Being able to use a without reading the manual is
actually one of my personal tests of the user interface. Jump in, see
how it plays and what is presented to make changes if needed.
The K3 easily passes that test (former Kenwood user; Elecraft is similar
in format), HOWEVER that is on the
That is not true, except at full power. The manual clearly states power
levels at 10:1, 5:1, and 4:1 VSWR's for different frequency ranges.
RTFM is a wonderful acronym to follow. I'm always surprised to read "I
think..." "I recall..." and similar posts to answer a poster's question.
Most of us
Hi Jim
Thanks for the new link. I must say we made several big chokes using the "old"
method and our analyser wasn't good enough to measure the common mode
impedance, so our conclusion was they were all above the analyser limit of
several thousand ohms. I'm about to make a single core choke,
On 9/3/2020 4:21 AM, CUTTER DAVID via Elecraft wrote:
I use K9YC-style chokes, eg several turns on 240-31 core, or, if it's really bad,
several turns on several cores using 7" diameter turns (from memory, check his
cookbook). I'm told this is cheaper and better than anything you can buy. Of
st a crappy piece
> > of cable and it just failed.
> >
> > Unfortunately this is not the sort of fault that can be detected in its
> > development stage by a low power antenna analyser, it needs a fair amount
> > of power.
> >
> > This long tale may ju
KPA1500 tuner is rated for maximum antenna SWR of just 3 to 1.
73, Roy K6XK
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low power antenna analyser, it needs a fair amount of
> power.
>
> This long tale may just give you some clues to your possible issue on 160m
> although on a different power scale..
>
> 73,
>
> Alan. G4GNX
>
>
> -- Original Message --
> From: &quo
--
From: "Ken Ramirez de Arellano"
To: elecraft@mailman.qth.net
Sent: 02/09/2020 22:41:30
Subject: [Elecraft] KPA-1500 SWR fault above 700-800 watts on 160m
Every bit of antenna hardware ( coax, balun, insulators, etc. have been
changed out or proven good. Connections are all
If your Clipperton amp doesn't have the same problem then it does indeed
point to the KPA1500.
I don't own a KPA1500, but a quick look at the online manual shows that
the tuning unit is an L-Network. Depending upon the load the unit is
trying to match, an L-Network can require a very
Every bit of antenna hardware ( coax, balun, insulators, etc. have been
changed out or proven good. Connections are all solid. My KPA1500 will
transmit above 800 watts for about 15-30 seconds and then the SWR jumps up
and it faults out for high VSWR. I can run 1500 watts on all the other
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