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GM8APX > PROPAG 17.12.96 16:59l 27 Lines 974 Bytes #-10801 (0) @ WW
BID : 9228_GB7EDN
Read: DL9MEN DH1GD DL1GRT GUEST
Subj: Straight lines? NEVER!
Path: DB0AAB<DB0MWS<DB0RBS<DB0SWR<DB0FP<DB0SRS<DB0MW<DB0AIS<DB0NDK<DB0RWI<
DB0IZ<DB0GE<LX0PAC<ON7RC<ON4ABG<ON4OB<ON4KTK<GB7SXE<GB7VRB<GB7XJZ<
GB7BNM<GB7GLO<GB7WAR<GB7COV<GB7COV<GB7FLG<GB7SYP<GB7WRG<GB7CYM<GB7EYM<
GB7HER<GB7JED<GB7SAN<GB7EDN
Sent: 961215/1115Z @:GB7EDN.#77.GBR.EU #:9228 [Edinburgh] $:9228_GB7EDN
From: GM8APX@GB7EDN.#77.GBR.EU
To : PROPAG@WWW
I'd be grateful to hear from people who have definite information, OR evidence
and theories, as to what weather conditions cause UHF (and to a lesser
extent VHF) to curve (a) upwards like an upside-down umbrella, and (b)
downwards like a brolly the right way up.
It's been cold here recently but the sun is strong so presumably the air is
warming up - or could it be that the ground is warming up faster?
Anyway, in such weather I nearly always notice poorer reception from a high
power Tx only a few miles away. In commoner weather conditions the signal is
very strong.
My links on VHF and UHF with nearby nodes obey the same rules.
I have had a look in the VHF/UHF Manual but it says little more than that
weather affects propagation.
What I want toknow is HOW (in which direction) it does so.
Propagation in straight lines must really be quite rare!
73 de Bill b.h.jarvis@hw.ac.uk maestro@cix.compulink.co.uk
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