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I also use an upstairs room for radio, and I have found
it best to run a number of coaxial cables down to a waterproof box at ground
level in the garden. Here I can connect my aerials to them, and this
is also the centre of the network of ground cables and earth-stakes, so it
is all securely grounded at this point.
The matching components (where possible) are also
located in this box. This reduces the pick-up of interferance sources in
the house.
You can think of it as moving the antenna socket of the
radio out into the middle of the garden.
73
Hugh M0WYE
----- Original Message -----
Sent: Thursday, June 09, 2011 11:07
AM
Subject: LF: antenna for 137kHz.
Gentlemen - some advice, please.
My radio room is in a
bedroom at the back of my house.
Currently, I use a wire running from
the bedroom up to a pole on the chimney about 35ft (10m) above ground,
then to a pole at the bottom of the garden about 100ft (35m) away, then
down to the bottom of the pole, where
it is tied off.
I tried
running the wire back to the house (end not connected to anything) at
about 8ft above ground (2.5m)
but this runs alongside a long building with
my office, with electicity cables, computers, etc, so it picked
up a lot
of noise.
The signals seem "cleaner" when this return run is cut
off.
How can I improve this setup?
I am thinking of pulling the
far end of the wire over to the other side of the garden and running it back
to
the house there, probably about 10ft (3m) above ground, then back
inside to make a loop.
I would then have a loop aerial in a 45 degree
plane, roughly.
Does this sound as if it could be an improvement over
my current setup? Would lifting the bottom of the loop
up to be more
horizintal be better or worse?
Any other suggestions?
My garden
runs roughly East-West. Does my current "Inverted U" aerial have any
directivity at this frequency
(137kHz)? What would be the directivity of
my proposed 45 degree loop?
Thanks for any help &
suggestions,
Martin GW3UCJ deep in the Swansea Valley!
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