|[AMRadio] Re: Home Brew|
ne1s at neandertech.com
Wed Sep 29 13:02:45 EDT 2004
Cathode modulation works best with triode RF finals. With testrodes you end
up with mostly grid modulation because of the (much) higher gain of the
grid-cathode circuit. The 50's handbooks (Left Coast & ARRL) explain this. I
presume high-mu trodes probably have the same issue.
Last spring I experimented with a grid modulator (inserted in the cathode
circuit) of a class C 807 PA. Worked well, but only about 7W of carrier out
(about what you'd expect from an "efficiency-modulated" 807).
> I am trying to figure out how to cathode modulate the 4-1000 I have. I have
> a pair of 813's and have a 4-125. Have a bunch of 807's and 1625's as well.
> Joe W4AAB
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