[BC] Trapezoidal modulation display

[Milton R. Holladay Jr.]

The fly in the ointment was the fact that transformers cannot pass DC
components (especially clipped waveforms) and also tended to average the
asymmetrical waveforms a la Symmetra-Peak. The fewer xfmrs, the better, with
non-plate modulated xmtrs having the best potential for asymmetry. (I
believe the pulse width modulated xmtrs came out after the 125% limit was
imposed, or things may have really been exciting.)
M
----- Original Message ----- 
From: "Phil Alexander" <dynotherm at earthlink.net>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Sunday, February 19, 2006 1:37 PM
Subject: RE: [BC] Trapezoidal modulation display


> It could be done on most high level plate modulated boxes
> of the day. AFAIK Gates was the only manufacturer that
> did it as a standard option. Most of the 5's were based
> on the 10's with smaller iron etc. A PA built around a
> pair of 3X2500F3 or similar was common. Properly driven,
> 175 or 200% + modulation was not that hard if the PS was
> adequate.
>
> Phil Alexander, CSRE, AMD
> Broadcast Engineering Services and Technology
> (a Div. of Advanced Parts Corporation)
> Ph. (317) 335-2065   FAX (317) 335-9037
>
>
> On 19 Feb 2006 at 10:17, Steve Michaels Productions wrote:
>
> > It was an RCA transmitter at WEAM.