Hi Jim,
I do have much more modern handbooks. Current in fact. :) Just
remembered more Class C referenced in the older ones.
Will have to go read articles back then on key clicks and distortion.
And continue to look at what amplifiers I could use on the two soon to
be lowest bands.
73, tom w7sua
On 7/27/2015 5:13 PM, Jim Brown wrote:
On Mon,7/27/2015 4:57 PM, Tom Azlin W7SUA wrote:
In all the old handbooks the discussion of amplifier design says (
page 76, 1941) "In amateur transmitters, and r.f. amplifier is
invariably operated Class C ( see Chaptr 3)." I though the final tuned
circuit was simply "pulsed" at the RF freq and then the output
filtering knocked off harmonics leaving a clean CW note.
Yes and no. Yes, the tank of a class C amp is pulsed and the output
network kills the harmonics. But it does NOT kill the intermodulation
distortion that is produced by the non-linearity, and that intermod is
heard as clicks.
BTW -- you need a MUCH newer Handbook. :)
73, Jim K9YC
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