Re: [IRCA] TIS coverage

["Neil Kazaross" <neilkaz@xxxxxxxxxxxxx>]

The DFW TIS used 60 watts if I recall and were easy here in IL as there 
wasn't much of anything on those channels then to QRM then.

73 KAZ
----- Original Message ----- 
From: "chris and anne" <tantwo@xxxxxxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2007 3:04 PM
Subject: Re: [IRCA] TIS coverage


> 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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