MarkAren wrote:
Hi Jack,

-- snip --

APC - Anti Parasitic Choke. A few turns (10 ?) of 22AWG enameled
copper wire around the out side of and terminated with a 10 ohm 1W
resistor. If the AMP becomes unstable at VHF, the reactance of the
small inductor will increase and the 10 ohm resistor will dampen the
mayhem.

See http://www.somis.org/Oct88qst.html

-- snip again --

I have read that these are better built with a bit of resistance wire,
because the inductor is reputed to sometimes work too well.

I dunno the details though -- all my work ends up being QRP, so I
haven't had occasion to make such a beastie.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html