[TCARC-NTx] Re: ground wire, again

[David Johnson]

The coax has a "shield" to keep it from interacting with other conductors,
so unless the coax is faulty, it will not effect the outgoing signal.  If
you were using a ladderline or twinlead, it would react, but not with coax.

For a receiving antenna, just horizontally under the eave should work just
fine and be less obtrusive.  Keep in mind that receiving hf, you are
basically receiving groundwave or skywave.  Groundwave comes from
transmitters close by.  Skywave is from those that are "skipping" their
signal off the atmosphere and the eath's surface.  So for receiving distant
stations, you are receiving a signal that is "coming down" off the sky.  You
should be able to put the antenna just about anywhere as long as nothing
like metal is near it to shield out the signals.  Under a raingutter, for
instance, might cause some of the signals to get shieled out.

For transmitting, it is different.  In the case of transmitting for skywave
propogation, you usually are wanting your signal go as far around the earth
as possible.  In that case, you want your antenna to have the best view of
the horizon (so that means the higher the better), so that you can take
advantage of the low angle of radiation (radiating out, not up) and bouncing
off the atmosphere as far away as possible, so it will skip further around
the world.

Of course, their are caveats to all this, but maybe some of the other club
members would like to jump in and share their views....

david


----- Original Message -----
From: "Alan Parker" <cherrymaxap@yahoo.com>
To: "david Johnson" <kb5ylg@yahoo.com>
Sent: Wednesday, January 16, 2002 10:10 AM
Subject: ground wire, again


Hey David,

I got another question.  On the ground wire for the
radio you said run it along the coax and go outside to
ground.  Will that cause any interference in
transmitting signals?

Second question.  I'd like to put up a shortwave/hf
receiving antenna wire.  If I run that up my antenna
mast will that work?  Should I keep it horizontal
under the eave of the house?

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