Re: [IRCA] TIS coverage
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [IRCA] TIS coverage



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/

_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx