[AMRadio] AM Linear amplifier operation

Mike Dorworth, K4XM k4xm at arczip.com
Fri Jan 14 11:48:44 EST 2005

QST Magazine for February 1956, on page 39 in the Technical Topics Section
 has a very nice article explaining  Linear Amps and AM operation
The Carrier never goes away and the thing runs cooler while talking when the
efficiency goes up!.

The tubes must have twice the dissipation of the carrier output.
That sounds like a 30L1 with 260 watts total dissipation should do 130 watts
Maybeso, remembering however that most SSB rated supplies are designed
around the 20 percent duty cycle for voice operation  level. Which means
that the constant carrier works on it . Bottom line, on most SSB rated amps,
run 1/4 total dissipation as carrier unless you have that special HEAVY iron
transformer (can we say Boatanchor?).

Read the article and it will all make sense..

Hope this helps.. 73 Mike 4XM

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