38 Special output filter cap questions

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From: Marty Watt (mdwatt@usit.net)
Date: Tue Mar 11 1997 - 19:09:12 EST


In looking at the mods for the 5 watt mod, Paul, NA5N, suggests
adding a 330pF silver mica cap in the space marked C501 (immediately
preceeding the L-C series output filter). Other comments also
indicated a range from 330-560pF would work, and that adding 270pf
to the "middle" silver mica cap was an option too.

It seems there are several options:

        C501 C28 C29

1. 330pF 820pF 560pF
2. 560pF 820pF 560pF
3. 330pF 1090pF 560pF
4. 560pF 1090pF 560pF

Which of these combinations is the prefered combination, for purity,
harmonic suppression, and power output?

Also, a single 1090pF silver mica cap doesn't appear to be made.
Given a choice, if required, would a 1000pF or a 1200pF silver mica
be preferred?

Thanks for the input. I'll post a summary of responses on the list
for all to peruse in a few days ...

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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