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M1BYT > HF 01.09.03 14:43l 65 Lines 2587 Bytes #999 (0) @ WW
BID : 7C1765M1BYT
Read: DB0FHN GUEST
Subj: Re: G5RV Antenna
Path: DB0FHN<DB0RGB<DB0FSG<DB0PV<DB0MRW<OK0PKL<OK0PCC<OK0PRG<OK0NAG<9A0BBS<
LZ0FBB<GB7CRV<GB7FCR
Sent: 030901/1230Z @:GB7FCR.#16.GBR.EU #:13133 [Blackpool] FBB-7.03a $:7C1765M1
From: M1BYT@GB7FCR.#16.GBR.EU
To : HF@WW
GM0CSZ Opined with considerable skill:-
> Indeed a dipole with balanced feeder is always fine be it with a approx
> 600 Ohms ladder line or a 450 Ohms or 300 Ohms ribbon feeder. The
> antenna's shape does not matter all that much. Even a loop will usually do
> well.
One extra point worth mentioning.....
My antenna is an inverted V straddling across the roof of the house. It
is supported at the top via an arm clamped to my two inch mast coming
away from the mast horizonally.
From the end of the arm I dropped a short bit of rope, at at the end of
this I tied very tightly a piece of curved 3/8" copper pipe. My anttena
wire runs through the copper pipe and my feedpoint is some way away from
the highest point close by the arm and towards the rear of the house.
The legs of the V are far from symetrical and of no particular length,
with the shorter length at the front.
By attaching a rope on the end of the shorter leg of wire, it allows me
to easily lower the antenna down to the ground for maintenance, sliding
easily through the section of copper pipe.
I didn't use a G5RV or anything bought commercially, just perfectly
ordinary plastic covered single core, flexible 2.5mm electrical cable,
plus an home made centre insulator. This has 450Ohm ladder feeder then
dropping down to the AH-4.
It tunes up perfectly on all bands from top band to 10m at the push of a
button with my AH-4.
It took no measuring, no testing. I simply put it up the longest length
I could manage and it works a treat.
V V = VHF/UHF antenna
I I = mast; I = rope with copper pipe at the end
___I_
I I ___ = arm; ^ =feedpoint /centre insulator
/ \ I
/ I\
/ I \
/ ^ I \
/ \
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º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º International Museums Weekend 19th+20th June 2004 º
º www.ukradioamateur.org/imw/index.html º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º The ARC's FL/RAE courses + Newcomers Intro to º
º to amateur radio:- http://www.ukradioamateur.org/ º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍËÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º QTH: Garforth, W. Yorks.. º Timed 12:30 º
º harry.m1byt@tiscali.co.uk º 01 Sep 2003 º
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÊÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
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