Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Brian D
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Brian D
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..

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Ron D'Eau Claire
--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...

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Clay Autery
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Dave Cole
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Don Wilhelm
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Ron D'Eau Claire
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Nr4c
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

Re: [Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Dave Cole
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

[Elecraft] Strange SWR change on 20 at

2017-05-13 Thread Terry Brown
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