Re: [IRCA] TIS coverage

["chris and anne" <tantwo@xxxxxxxxxxxxx>]

Interesting, Patrick....Used to hear DFW pretty regularly in Florida....on 
1640 and 1680, as I remember. Thanks, Chris  S.C.
----- Original Message ----- 
From: "Patrick Griffith, N0NNK / WPE9HVW" <AM-DXer@xxxxxxxxx>
To: <irca@xxxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2007 3:30 PM
Subject: [IRCA] TIS coverage


> Keep in mind that most TIS stations are designed for short distance
> operation. Most TIS stations have a very minimal ground system that is
> mostly for static/lightning dissipation rather than for counterpoise
> purposes. I have inspected well over 100 TIS installations up close and
> only a couple had efficient ground systems. Most of the pole mount
> antennas have only a simple ground rod at the base of the pole. I have
> also inspected five TIS stations using the big Valcom antennas. Only one
> of them had an actual counterpoise. The two at D/FW Airport each had
> only a single chemically enhanced ground rod. Interestingly, the TIS
> stations with the best signals seem to be the roof mounted ones that
> either use an actual ground plane laid out on the roof, or the metal
> roof support beams, or an actual metal roof as the counterpoise. The
> presence of a counterpoise combined with the height of the roof mount
> units seems to give them superior coverage.
>
> Patrick Griffith, Westminster CO
> Broadcast Technician
> NRC Broadcasting - Denver
> http://community.webtv.net/N0NNK/
> http://community.webtv.net/AM-DXer/
>
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