"Roy Lewallen" wrote in message
...
| It sounds like a technique I remember calling "controlled carrier". The
| carrier power was reduced when you weren't talking, then was increased
| with the audio in an AGC-like manner. Sounded a little weird, but not
| badly distorted. The objective was to reduce the average dissipation of
| the final stage, so smaller tubes and a lighter duty power supply could
| be used.
|
| But I don't see why you'd use a method like this with a low power
| transmitter, since it's trivial to make one that easily handles the
| power requirements of standard AM. So I don't really think that's what
| is meant by "swing". I'd bet good money that whatever "swing" is, it
| doesn't improve quality or signal strength, and very likely introduces
| distortion that causes splatter. If the transmitter was designed for
| 100% modulation of a 4 watt carrier, and you reduce the carrier without
| a proportional reduction of the audio, you'll be overmodulating and
| consequently distorting and splattering.
|
| What are the supposed benefits of this "swing"?
|
| Roy Lewallen, W7EL


To reduce the drive power to an amplifier and make the modulation louder.

Chris