On Sun, 09 Mar 1997 10:29:41 -0800, Steve Miller
<kg7pv@teleport.com> wrote:
>Well, after a good nights sleep the obvious occured to me. In part one I
>found that the tx was not stable when I installed my 38s in its case.
>Worked fine on the bench and in the box IF I used insulated standoffs....yep
>- one of the metal standoffs had contacted one end of C29 of the output
>filter and voila - bad sig. My solution is to leave the plastic standoffs
>installed since I don't have any smaller metal ones. Moral: sometimes the
>solution really is simple! 73
If the "gurus" wouldn't mind posting their comments publically, I'd
appreciate it. This sounds kinda wierd to me ... I just looked at
the board again -- one end of C29 is on the ground bus, as designed.
I'm not sure why this would create a problem -- perhaps plastic
cases are being used, and the rig needs metal cases? Also, another
poster mentioned isolating the antenna connection from ground, else
trash results. I'm confoosed. Badly confoosed. I understand the
voltage regulator case, and the IRF-510, need to be isolated from
the case, thus the TO-220 mounting kits from RS using NYLON screws
and nuts, rather than the supplied metal ones. But it sounds very
much like these gentlemen have determined the whole rig needs to be
isolated from the case, which doesn't make sense to me. Could be
right, though. What do I know ...
72 es 73 de
Marty, KM7W
__________________________________________________________________
Jackson, Tennessee e-mail: mdwatt@usit.net
http://www.public.usit.net/mdwatt
"The Curmudgeon's Corner"
NorCal #???? - ARCI #7514 - QRP-L #953 - AK/QRP #098 - Grid EM55oq
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