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PICList Thread
'OT AM antenna'
1999\09\03@161354 by john pearson

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I want to get AM on my reciever/amp. I have a coax 75 ohm cable comming from
a TV antenna on the roof into the 75 ohm FM input on my reciever. Can I
split that coax line and make a connection to the AM antenna input on my
reciever along with the FM input. If I can, would I split it with one of
those 75/300 ohm splitters and put the 300 ohm end into the AM input?

Oh, the little loop antenna I got with the reciever doesn't work well. It
picks up a loud 60Hz hum from the house wiring. Would aluminum wiring cause
this?

Thanks
John

1999\09\04@043733 by Stuart O'Reilly

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No sorry you can't use the antenna on your roof to pick up AM, the
frequency is way to low. AM is aprox 1 Mhz and your tv antenna would be
aprox 100Mhz. I can't give you any advice on how to get around this
either, sorry. I can't see how Aluminium wiring would cause a hum
problem, I'd try to relocate the receiver or at least it's loop antenna.
Regards
Stuart

john pearson wrote:
{Quote hidden}

1999\09\04@073258 by paulb

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John Pearson wrote:

> Oh, the little loop antenna I got with the reciever doesn't work well.
> It picks up a loud 60Hz hum from the house wiring.  Would aluminum
> wiring cause this?

 No, but fluorescent lights may.  I'd say you are either in a very low
signal area (such as an office building) or the set is faulty.  If you
need to use an outside antenna, you should use a car radio for the job
('cause that's what car radios are designed for).

 You can either fix some sort of car radio antenna to a metal roof or
run a piece of car radio coax (it's special) from the set to a metal
roof or ground stake outside where you connect the shield, and run a
long wire (self-explanatory) from the centre conductor, somewhere away
from the building.
--
 Cheers,
       Paul B.

1999\09\04@074523 by Bob Drzyzgula

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The best AM antenna is a long, straight wire, strung out
parallel to the ground around 20' high or so. You only use
one wire, the Earth acting as your ground plane. This is
of course impractical in almost all real-life situations,
but nonetheless I found a decent description of how to do
this here: http://www.arrowweb.com/M1/otr/antenna.html

The 60Hz hum is either being radiated and picked up by
your antenna or possibly being brought in on the power
cord and not being filtered out in your receiver. I
found a good discussion of how to deal with this at:
http://www.wolfenet.com/~kiwa/rxtips.html

Hope this helps.

--Bob

On Fri, Sep 03, 1999 at 01:01:25PM -0700, john pearson wrote:
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