George,
My Harris Platinum-1 (ch. 2 TV) linear runs 1000w output for 11w
drive which is 19.6 dB gain. But this is on 6m which I do not
believe is restricted to 15-dB gain by the FCC. My understanding
that this rule just affected HF amplifiers. In any case it is
legally built under FCC rules for television and is modified for use
by hams on 6m or higher bands. There is no rule restricting you
building a ham amplifier with more than 15-dB (only applies to
manufacturers who sell to the public).
In fact, I can build such an amplifier and sell it legally to another
ham, as long as I am not a business doing multiple sales per year.
I built several linear amps for 2m that produced 80w output with as
little drive as 50mw. They are biased to draw 8A quiescent current
(about 15A at 80w output), so this is near to class-A. I have some
50w linear amps for 3400-MHz that draw full current without drive
(obviously class-A) and you do not want to key them long-term in Tx
or you risk over heating them. They drive with 5mw.
Ed - KL7UW
-------------------------------
I believe my Harris analog TV PAs were in the 20 db gain region - apx 10
watts in for a kilowatt out. I believe the digital PAs were lower gain to
run as class A (or very close to class A).
>From the analog exciter output to IPA to PA to low-pass/filterplexer output
it was from 250 mw to 30 kw. That would be over 50 db gain! And that system
was type accepted.
73
George - AI4VZ
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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