[Antennas] thoughts and commnts needed

[Jack Painter]

That G5RV has got to be resonant somewhere right? If you know where, try the
430S there without the tuner and that will identify the tuner as the problem
or not.

You might have found a height above ground, feedline length and frequency
combination that the tuner cannot handle well. Easy enough to change some of
those variables to find out.

Good luck,

Jack

----- Original Message ----- 
From: "RB" <rbig at bellsouth.net>
To: <antennas at mailman.qth.net>
Sent: Tuesday, January 25, 2005 6:08 PM
Subject: [Antennas] thoughts and commnts needed


Got a strange situation I need some thoughts on.

Just tuck a 102' G5RV up approx 30' high.  I use a Kenny TS-430S xcvr, and a
Dentron RT-3000 antenna tuner.  I'm running coax up to a 1:1 balun, and a
32' piece of ladderline goes on from the balun up to the antenna feedpoint.

I've run this exact antenn previously, with this exact setup, and it worked
great.

This one is looking good, in the shack, but isn't getting out at all.

The book tuning procedure is to set the two caps midway, and then roll the
coil and listen for an increase in noise on revceive.  I did this, and it
works OK.  Then, you're supposed to be able to do some knob twiddling and
get the coax pretty flat.

What wasn't normal was that once I started the knob twiddling to bring the
SWR down, I had very faint dips using either cap.  I was able to get it it
on down, slowly, by going to first one and then the other var cap.

After I got it as low as the SWR would go, my var caps were still just about
perfectly at mid range.

The xcvr liked the setup OK, as I was able to get good power to the tuner.
Don't know if anything was going out of the tuner or not, though.  I tried
to check into a net where they were listening for me, and wasn't being
heard.  Usually I'm approx 10-20db over S-9.
______________________________________________________________
Antennas mailing list
Home: http://mailman.qth.net/mailman/listinfo/antennas
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Antennas at mailman.qth.net