[BC] Nighttime operation by daytimers

[Mike McCarthy]

Well, that's where good engineering comes into play.  Choosing a 200 deg. 
radiator over a 225 deg. will yield better results in this case. The best 
Class C's I know of have 170- 200 deg. radiators.

Yes, dial-a-power can be a bit tricky...  But a good engineering process 
will yield the best solution if management allows the consultant or staff 
the latitude to do such.

MM

At 08:50 AM 2/25/2006 -0500, Phil Alexander wrote
>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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