[Antennas] thoughts and commnts needed
RB
rbig at bellsouth.net
Tue Jan 25 18:08:56 EST 2005
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.
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