Re: [IRCA] More coax experiments

["Chuck Hutton" <charlesh3@xxxxxxx>]

Patrick:

Cable systems need very good shielding to prevent over-the-air signals and
noise from getting into the cable system. Because of that, you can easily
and cheaply buy quad shielded RG6.

It should have no leakage through the shield.

That doesn't mean the problem is totally solved. You should also install a
choke balun and a good receiver ground. That makes sure that anything on the
shield (it's an antenna too) has an easy path to ground and a difficult path
towards your receiver.

Probably a better coax will notably improve your coax leakage. Chances are
somewhat in your favor the choke balun isn't necessary.


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of Patrick Martin
Sent: Friday, August 17, 2007 9:27 PM
To: irca@xxxxxxxxxxxxxxxx; am@xxxxxxxxxxx
Subject: [IRCA] More coax experiments

I went back out tonight after tuning in KFI 640 and I could hear
something u/KFI off the Eastern beverage. I tried the test again with
grounding the far end of the coax at the matching transformer. KFI got
weaker and the station(s) behind KFI were more there. I am beginning to
really feel that the coax indeed is affecting the directional pattern of
the antennas. But what to do about it.? I can run anything under the
house, but the last 6-8 feet has to be buried, so open wire probably is
not an option. I yes I could run coax and ground the shield every few
feet. That might help, but it is alot of extra work. I wonder if there
is coax out there that has no extra pickup? It must be the shielding. 

73,

Patrick 

Patrick Martin
KAVT Reception Manager

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