[Amps] Rice Box Exciter to Collins 30S-1 & 30L-1

[R.Measures]

On Jul 8, 2004, at 9:42 AM, Paul Christensen wrote:

> =F0  Indeed, Joe, when run properly (at a 4 to 1 ratio), low-level
> modulated, linear-amplified AM has way less audible distortion that
> traditional plate-modulated AM.
>
> This is also backed by the numerous operators running low-level =
Kenwood
> TS-850 rigs in AM mode into high-linearity amps.   Many have modified=20=

> the
> TS-850 with ultra-high-quality Jensen audio transformers such that=20
> they can
> couple professional, line-level audio (i.e., balanced +4 dBu) to the=20=

> (by
> unbalancing) balanced modulator.  When these guys check into the=20
> various AM
> nets, the audio quality is so good, most swear they are running
> plate-modulated AM transmitters.

=F0  High-level plate-modulated typically has 10 to 15 times more=20
distortion than low-level AM followed by linear amplification.   The=20
exception is when the high-level modulator incorporates inverse=20
feedback to improve linearity, and that's pretty rare in Hamdom.
>

cheers, Paul
>
>
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org