>
>
>-----Original Message-----
>From: Mike Sawyer <kc4slk@csrlink.net>
>To: Phil Clements <philk5pc@tyler.net>; amps@contesting.com
><amps@contesting.com>; Bill Aycock <baycock@hiwaay.net>
>Cc: 2@vc.net <2@vc.net>; w8ji@contesting.com <w8ji@contesting.com>
To: <amps@contesting.com>
>Date: 14 September 2000 01:09
>Subject: Re: [AMPS] Blown TL922A... What to do?
>
>
>>
>>Personally, I found the article, (The Nearly Perfect Amplifier) very
>>informative. I remember that a friend of mine completed an amp using a pair
>>of 813's. He originally used the standard "coil wrapped around the
>resistor"
>>style parasitic chokes. He was cited by local hams for distributing
>unwanted
>>spurs on 144Mhz, (and where else has never been found). After reading
>Rich's
>>article, he added the NiChr hairpin style parasitic chokes. This was all
>>that was changed. Guess what?? No more spurs! NO nothing, but 700 watts of
>>RF at the desired frequency. So there is something to be said for these
>>style chokes.
>>We tend to mock ,what we don't know.......
>It would be interesting to know if a different suppressor design not using
>nichrome could cure the problem.
>
I don't see why not, Steve. Increase L-supp in a copper-wire suppressor
and Rp decreases. This lowers VHF amplification. The fly in the
ointment is increased dissipation in R-supp on 29MHz. If R-supp burns
out, there could be a problem.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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