Re: Time to update at least one interesting tower site

["Dan Strassberg" <Dan.Strassberg@att.net>]

Thanks, Mike.

What you're saying appears to be that WGBH-FM will be running the equivalent
of 100 kW at 150m HAAT. The 10.5 kW you mentioned for a B should produce
coverage equivalent to 50 kW at 150m HAAT. Since 'GBH has been running 100
kW at a little more than 150m HAAT (roughly 25% more), 21 kW at 323m seems
to represent a reasonably significant reduction in height-corrected ERP. To
a first order, to maintain constant coverage as you vary the HAAT, you must
reduce power in inverse proportion to the square of the HAAT. Thus, 100 kW
at 187.5m should produce coverage equivalent to 156.25 kW at 150m. I wonder
what the problem was with getting 30+ kW at 323m.

--

Dan Strassberg, dan.strassberg@worldnet.att.net
Phone: 1-617-558-4205, eFax: 1-707-215-6367

-----Original Message-----
From: Michael P Fitzpatrick Jr. <fitzradio@the-spa.com>
To: Dan Strassberg <Dan.Strassberg@att.net>
Cc: boston-radio-interest@bostonradio.org
<boston-radio-interest@bostonradio.org>
Date: Wednesday, October 25, 2000 2:56 AM
Subject: RE: Time to update at least one interesting tower site


>On the FM 128 Tower , the top master antenna is, WBMX 98.5 and WCRB 102.5..
>ON the mast, near the bottom of the Mast, is WJMN.
>
>ON the actual tower, side mounted, at the top is WBUR.
>
>On the tower , on the side, a ways down, is WODS.
>
>Below WODS is a two bay ERI antenna which I can't find any license of who
>owns/uses it but I am assuming it's just a back up antenna.
>
>WGBH-FM will be running 21kW from 323m AAT. According to my calculations
>using FMPOWER, this is weaker than a C1 but stronger than a B (C1 would be
>84kW, B would be 10.5kW).