On Jul 8, 2004, at 9:42 AM, Paul Christensen wrote:
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
the
TS-850 with ultra-high-quality Jensen audio transformers such that
they can
couple professional, line-level audio (i.e., balanced +4 dBu) to the
(by
unbalancing) balanced modulator. When these guys check into the
various AM
nets, the audio quality is so good, most swear they are running
plate-modulated AM transmitters.
High-level plate-modulated typically has 10 to 15 times more
distortion than low-level AM followed by linear amplification. The
exception is when the high-level modulator incorporates inverse
feedback to improve linearity, and that's pretty rare in Hamdom.
cheers, Paul
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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