[BC] Gain or loss...

[Dana Puopolo]

I know that Valcoms aren't recommended for domestic AM broadcast at
frequencies below 900 or so, as their efficency drops below FCC minimums.

-D


------ Original Message ------
Received: Sat, 01 Jul 2006 04:14:06 PM EDT
From: "Burt I. Weiner" <biwa at earthlink.net>
To: broadcast at radiolists.net
Subject: [BC] Gain or loss...

Let's look at this from another point of view:  The Valcom has less 
loss.  What is efficiency at, say 530 kHz?

Burt
Stirring the pot a wee bit.


At 10:01 AM 7/1/2006, you wrote:
>Date: Sat, 1 Jul 2006 00:58:22 -0600
>From: AM-DXer at webtv.net (Patrick Griffith, N0NNK / WPE9HVW)
>Subject: [BC] Re: TIS facilities
>To: broadcast at radiolists.net
>Message-ID: <13940-44A61D0E-1249 at storefull-3317.bay.webtv.net>
>Content-Type: Text/Plain; Charset=US-ASCII
>
>There's no way a Valcom antenna has gain. I'd believe 40 watts TPO and
>10 watts ERP, but certainly not the other way around.
>-------
>Dana, I don't have a problem believing that a 60 foot top loaded Valcom
>would exhibit superior radiation compared to one of the typical 15 foot
>center loaded TIS whips. In this case the FCC apparently expressed that
>as gain. And, as I mentioned, the TIS database does provide a field for
>ERP. For background, the State of Colorado previously had a series of a
>half dozen or so 10-watt TIS stations located adjacent to each major
>artery at the point where it entered the suburban Denver metro area.
>These provided virtually no coverage in the central Denver area. And,
>when the programming changed, each had to be reprogrammed independently.
>The centrally located "40 watt" TIS replaced all of those. The higher
>power rating is intended to provide coverage over the entire Denver
>metro area from a single site - about a 12 to 15 mile radius from the
>transmitter.
>
>Patrick Griffith, N0NNK
>CBT CBNT CRO
>Westminster CO
>http://community.webtv.net/N0NNK/
>http://community.webtv.net/AM-DXer/

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
K6OQK 



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