[BC] Nighttime operation by daytimers

[Phil Alexander]

On 24 Feb 2006 at 12:48, Mark Humphrey wrote:

> That's the idea.  It has been done before (I think the short antenna in
> Syracuse is homebrew) so as long as you run the numbers and file the proper
> paperwork, I don't see a problem.
> 
> Regarding high angle radiation -- I talked with the engineer/owner of WSIV
> shortly after he built his in-town night site.  He actually went to the
> trouble of driving to the eastern edge of the night service contour of KXEL
> (a domestic Class A he is required to protect) which falls somewhere past
> Buffalo, and listened carefully for his signal.  He didn't hear any trace of
> it (CHIN in Toronto was a much bigger source of interference) so he
> concluded there wasn't an issue.  A great win-win scenario, in my opinion.

Generally speaking, the high angle radiation is more a theoretical concern
than an actual one. It becomes actual if the station tries to boost the
power to the short antenna to achieve the same f/s a with a taller radiator.
In that case, I expect the application would need to contain NIF contour
studies. (This is a complication that "dial-a-power" introduces. <g> )
However, if it is simply a change from a more efficient radiator to a less
efficient one with the same input power, and the Commish is otherwise happy,
I don't see a problem.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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