[BC] Re: Early Rigid Coaxial line 2

[Ron Cole]

It was an RCA Superturnstilem CH 5.  Still in operation today I might add
but with a Harris transmiter, the RCA was removed from the building to make
room for the Harris HD UHF Transmitter.

Ron


On 11/22/05, Richard Fry <rfry at adams.net> wrote:
>
> >> In 1981 I rebuilt a 12 Bay RCA Batwing TV Antenna,
>
> >The lines were phasing lines, and were cut to a specific length
> > for each bay.
> __________________
>
> Small comment about this.  If it was an RCA Superturnstile, and it had no
> tilt/fill, then those semi-flex feedlines out of the power dividers all
> were the same physical/electrical length.  The length was chosen so that
> if
> one or more feedstraps was/were open at the radiator connection, the SWR
> defect that appeared would lie outside the active TV channel.
>
> If was a GE Batwing, they used different lengths for each bay level, with
> the electrical lengths feeding the same relative phase at all levels
> (absent beam tilt/null fill).  But if the feedstraps opened at the batwing
> connection, that would throw a sizable mismatch into the active channel,
> which would cause noticeable ghosting in the received TV picture.
>
> Two different design philosophies there, and both had some benefits and
> drawbacks.
>
> RF (who as an RCA employee aided/abetted in the initial assembly and
> testing of quite a few new RCA Superturnstiles, and the
> re-harnessing/testing of many more.)
>
>
>
>
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