[BC] Franklin Antenna

[George Nicholas]

Peter - Understood on the nomenclature of the various sectionalized
antennas.  We called it "Franklin" because it's easier to say than
"sectionalized tower."  The tall tower in the array also has the old WOC-TV
(now KWQC) channel 6 antenna.

What also makes WOC unique is the fact there are two other large towers in
it's near field.  On is 600 feet or so, the other is around 1400 feet height
AGL.  Both are detuned.

I believe the last consultant to make a lot of large-scale changes might
have been Oggie, back in the 70's.

gn


----- Original Message ----- 
From: <PeterH5322 at aol.com>
To: <broadcast at radiolists.net>
Sent: Wednesday, July 20, 2005 11:28 AM
Subject: Re: Re: [BC] Franklin Antenna


>
>
> >There is one sectionalized tower in the array, the other two are standard
> >series fed towers.
>
> You right; me bad.
>
> The two end towers are quite tall, at 187.1 degrees. Conventional in
> every respect, indeed.
>
> The offset center tower is Sect=8, A=145.00, B=180.00, C=6.81 and D=0.38.
>
> That is one efficient DA!
>
> The night pattern RMS corresponds to 352.66 mV/m/kW at 1 km. Almost Class
> A efficiency.
>
> The day pattern RMS corresponds to 382.17 mV/m/kW at 1 km. Better than
> Class A efficiency.
>
>
> >Because the top and bottom sections of the "Franklin"
> >(what we called it) are separately adjusted, the antenna monitor had 4
> >spickets.
>
> A Franklin is Sect=3; WOC's sectional is Sect=8.
>
> There are several Sect codes which are reserved for unconventional
> radiators. Sect codes higher than 2 are often named for their creators,
> or for the station which first used these.
>
> Conventional, non-top-loaded: Sect=0
> Conventional, top loaded: Sect=1
> Conventional, sectional: Sect=2
>
> Franklin-type: Sect=3 (A is assumed to be 180.00, and the radiator is a
> 180 over 180, otherwise the radiator is classified as Sect=2).
>
> WHO-type: Sect=7
>
> There is a Sect code for WCCO-type (never constructed) and one or two
> named for Carl E. Smith.
>
> Perhaps 8 is a Smith-type?
>
> I don't recall, and that info is embedded in the "C" code for that FCC
> function which takes Sect, A, B, C and D, and elevation angle as
> parameters (variables), and returns the field ratio at that angle.
>
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