RRE: [BC] Mono Expands on the FM Band

[Robert Orban]

At 02:37 PM 1/18/2006, you wrote:
>From: DANA PUOPOLO <dpuopolo at usa.net>
>Subject: RE: [BC] Mono Expands on the FM Band
>To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>Message-ID: <792kaRs2B0864S21.1137610381 at cmsweb21.cms.usa.net>
>Content-Type: text/plain; charset=ISO-8859-1
>
>This is how the CAT link works. They truncate the upper sideband, which then
>gives them (the) room to fit the sampled waveform within a T1. On decode, they
>mirror the lower sideband to create the upper one .

The main disadvantage of this system is that it does not preserve the level 
control introduced by any composite limiting in the signal feeding the STL. 
Composite limiting introduces a Q component into the stereo subchannel 
(i.e, the sidebands are no longer mirror images of each other) that cannot 
be preserved when one only retains only the lower sideband; information is 
lost.

Bob Orban