... ...
>Have used the amp for four years in G2DAF configuration. In my opinion
>a very clever design wich also contributes to the stability.
>
The G2DAF circuit works fairly well with two-tone linearity tests --
*provided* that one uses minimal grid current.
- Eimac tells us that constant screen voltage is imperative for good
linearity. During a two-tone test on a G2DAF amplifier, the screen
potential is constant.
- Two friends built G2DAF amplifiers. They conducted two-tone tests.
The linearity was acceptable as long as they kept the grid current low.
I measured the IMD of these amplifiers, on the air when SSB
voice-modulation was in use. The total IMD products from either
amplifier was in the 21 - 23 db range when normal amounts of grid current
were flowing. (measurements were referenced against HP-355 step
attenuators}
.
>Read in the archive that some of you "wiseguys" stated that the G2DAF
>design was as close to class C as you could get. Bullshit!
>
>During the period I`ve used my amp I have`nt got a single complaint abt
>beeing "to broad".
Most people won't tell me when my zipper is down, Lars.
Rich...
R. L. Measures, 805-386-3734, AG6K
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|