[BC] BC] Some Input Needed Re: CBS 400, Mosely TFL-280

[Phil Alexander]

On 10 May 2005 at 12:16, Scott Bailey wrote:

> Bear in mind, those boxes were built before the early 80’s 
> term “Super Modulation” came about.  This is were the Commission 
> made it legal for AM’s to do 125% positive modulation.  

Just for the sake of accuracy, the FCC didn't start "allowing" it.
What they did was make a rule to put on a limit because many had 
been hitting 150-175% positive since the late 60's. Previously,
there was no rule that prevented anything except exceeding -100%
negative modulation and required at least 80 or 85% (can't recall
which) positive.

In the late 60's Gates made a "special" version of the BC-5P2 
with the 10 kW modulator section of a BC-10P in it. Anyone want 
to guess why? <ggg>

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




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