gt; > 73, Ron AC7AC
> >
> > -Original Message- From: Elecraft
> > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dave Cole Sent:
> > Saturday, May 13, 2017 10:39 AM To: elecraft@mailman.qth.net Subject:
> > Re: [Elecraft] Strange SWR change on 20 at
> >
&g
M To: elecraft@mailman.qth.net Subject: Re:
> [Elecraft] Strange SWR change on 20 at
>
> I added the SWR meter... My actual SWR jumps instantly up about1 SWR
> unit... I believe it is a bad connection on the Challenger where the main
> antenna connects to the 20 meter tuning stub..
--Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dave
Cole
Sent: Saturday, May 13, 2017 10:39 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Strange SWR change on 20 at
I added the SWR meter... My actual SWR jumps instantly up about1 SWR
unit...
I have ALMOST the same setup horiz loop at approx. 40 ft cut for
80m, fed with 45 feet or so of 300 Ohm (18 GA) foam core, twin-lead to a
Balun Designs 6:1, to TMW 240-DB coax (18-20 feet) to the K3s.
Never experienced anything like what you are sounds like something
is heating up... bal
I added the SWR meter... My actual SWR jumps instantly up about1 SWR
unit... I believe it is a bad connection on the Challenger where the
main antenna connects to the 20 meter tuning stub...
Just sort of surprised me to see a second person with the exact same
issue is all... SWR change is i
Terry,
I would be suspicious of the voltage balun, or connections in the
feedline/antenna that are breaking down with increased power. Change
the voltage balun to a good common mode choke. A 1:1 choke may work as
well or better than a 4:1.
You might also have a lot of common mode current on
13, 2017 10:19 AM
To: Terry Brown
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Strange SWR change on 20 at
What's the antenna impedance before the ATU is activated? You may be
heating up the BALUN due to big mis-match.
Sent from my iPhone
...nr4c. bill
> On May 13, 2017, a
What's the antenna impedance before the ATU is activated? You may be heating
up the BALUN due to big mis-match.
Sent from my iPhone
...nr4c. bill
> On May 13, 2017, at 12:07 PM, Terry Brown wrote:
>
> I recently started using my horizontal loop that is about a full wavelength
> on 80, for 2
Hmmm... I am having the exact same issue... My SWR changes after a few
transmissions, then returns... Up until now, I have been suspecting my
antenna... Time to add an external SWR bridge between the tuner and
antenna as a permanent thing...
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
O
I recently started using my horizontal loop that is about a full wavelength
on 80, for 20 meters. I took down my yagi as we are moving; drat! My
Horizontal Loop is at 40 ft. height and fed with 450 window line into a 4:1
voltage balun with about 15 ft. of coax to rig.
I am running 100 watt
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