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Author Topic: TREEs & ANTENNA  (Read 417 times)
M3SKF
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Posts: 5




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« on: May 14, 2005, 07:11:58 AM »

HI I HAVE A BEAM VERY CLOSE TO A LOAD OF TALL TREEs.PROBLEM IS ON PSK MODE I GET REPORTS OF VERY BAD FADING(QSB.THIS SEEM TO BE MORE ON A WINDY DAY WHEN THE TREEs ARE MOVING ABOUT.ANY HELP WOULD BE WELCOME.
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WB6BYU
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Posts: 13028




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« Reply #1 on: May 16, 2005, 02:12:27 PM »

what bands are you operating?

On HF I suspect variations in the ionosphere will have far
more effect on fading than the trees will.
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M3SKF
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Posts: 5




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« Reply #2 on: May 17, 2005, 01:00:22 PM »

Hello OP on all hf band 160-10 problem seems real bad on 20-10 thanks for reply.
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KB4QAA
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Posts: 2269




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« Reply #3 on: May 17, 2005, 03:31:14 PM »

Don't think trees are your problem.  They are essentially transparent at HF frequencies.  

Maybe you need to work "Downwind" contacts instead of crosswind.   HiHi.

73, Bill
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AA4PB
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Posts: 12685




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« Reply #4 on: May 17, 2005, 03:51:39 PM »

Unless the trees are very close (like a foot or so) so as to detune the antenna I doubt that they would cause any fading problems. Have you monitored the SWR on a windy day? Perhaps there is something else wrong like a loose trap, connection, or broken coax. I would also expect the signal interruption to occur in the received signal as well as the transmit signal regardless of the cause.

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M3SKF
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Posts: 5




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« Reply #5 on: May 18, 2005, 01:34:38 AM »

Thanks to all you guys for the remarks its all a bit strange to me as i have several antenna for hf & it seems to affect them all.
Hmm back to the drawing board hi hi.
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KI4CHJ
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Posts: 9




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« Reply #6 on: May 31, 2005, 04:01:37 AM »

Do you use a ladder line feed? Or some other feed that the wind may be blowing close to some metal object? I had a coax feed one time that was driveing me nuts and found out on a windy day the wind was slapping the coax around that made a difference. Check that out..
Gene
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