|To:||towertalk reflector <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] Funniest thing I've seen in weeks|
|From:||Jim Smith <email@example.com>|
|Date:||Mon, 11 Oct 2004 01:28:24 -0700|
Hi Tom and Jim L|
First of all, thanks very much for your replies.
I devised this simple model in the belief that it would reveal to me why a yagi will hear stuff a dipole won't, even though noise level in the direction of the signal will obviously increase the same amount as the signal due to the gain of the yagi. It seems to have done what I wanted. From this, understanding of Tom's items 2.) and 3.) come quite easily.
Thinking that the better hearing on HF due to putting up a gain antenna is due to the gain is certainly an easy trap to fall into. It was only after I did my little thought experiment that I was able to resolve the contradiction in my own mind. It is now very obvious to me how this works.
It has now also become obvious what a bad effect that big fat lobe pointing straight up on my low dipoles has on received SNR.
Yes, I have heard lots of folks claiming that a higher gain antenna will help both transmitting and receiving equally. I used to be one of them.
The diversity combining info was interesting. I have an R5 vertical mounted a foot or so above my old TH3 tri-bander. The TH3 will often hear signals Q4-5 which are inaudible on the R5. I have never bothered to look, but, under these conditions, the S meter should show noise from the vertical to be substantially more than that from the beam.
Hmmm.... maybe when I can hear a sig on both antennas I could listen to the beam on the main Rx in the MkV and the vertical on the sub Rx. Rats, MkV won't let me do that. I could put the vertical on the old 75A-4, though. As all audio lines here go through a patch panel it's dead easy to patch the A4 audio through the mixer into one ear and the MkV into the other.
73 de Jim Smith VE7FO
Tom Rauch wrote:
I'm told, by many people who know a zillion times moreabout this stuff
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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