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PE1HWO > SIX 09.10.02 20:39l 27 Lines 901 Bytes #999 (0) @ WW
BID : 5E0973PE1HWO
Read: DB0FHN DG5YMS GUEST
Subj: acoustic resonance 6m dj9bv ant
Path: DB0FHN<DB0ZWI<DB0HDF<DB0HOT<DB0MRW<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<IK6PYS<
ON0AR<PI8WFL<PE1NMB<PI8HGL
Sent: 021009/1659Z @:PI8HGL.#ZH1.NLD.EU #:54114 [Den Haag] $:5E0973PE1HWO
From: PE1HWO@PI8HGL.#ZH1.NLD.EU
To : SIX@WW
Hello Sixers,
We build a 6 elements DJ9BV design six meter yagi, like in Dubus V.
The antenna is working fine, but there is a problem with acoustical
resonance, in low speed wind. The elements become a aeolusharp. In the
house this sounds like a passing airplaine. I didn't have this problem
with other yagis. Seems that a full size 6 meter element is a critical
lenght for wind.
I got a tip to fill the elements with some foam like PUR, to muffle the
resonance. Problem is that PUR foam can't be removed, if it not doing the
job right. Another suggestion was the use of rope through the elements.
Do you have experience succesfully muffling acoustical resonance in 6m
antennas, please let me know how you did it?
73 - Andr‚, PE1HWO @ PI8HGL
pe1hwo@amsat.org
www.qsl.net/pe1hwo
Message timed: 16:52z on 09 Oct 2002
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