On Nov 2, 2006, at 12:00 PM, Jack Regan wrote:
Elecrafters,
While reading the thread re: charging batteries I saw the note re:
adjusting
the Astron.
It occured to me that I could bump the ouput up from 13.8 to the
"legal
limit" for my KX1. The goal of course is "more power" out!
Is this a bad idea? I say "bad" because I know that many will say
that
small increases in power are not of much value given the nature of
decibels
and the human hear, but unless this is a "bad" idea, I prefer to
experiment
and see what results I get!
The ads for my RS-70M say it is adjustabe and my schematic shows a
20K ohm
pot on the input to the V meter and a 500 ohm pot on the input to
the I
meter. I have not popped the top of the ps yet so I don't know
what visual
inspection will reveal. After I get some feedback on my idea I'll
take a
look and see what I can do!
BTW, my Kenwood TS-570D specifies 13.8 VDC plus or minus 15%. This
gives me
a ceiling on 15.87. I am only going to 14.2 for KX1! I run them
both of
the RS-70M when I am operating from home.
Those pots are for calibrating the meters and shouldn't be touched.
There will be another pot which goes to pin 4 of the 723 ic which
controls the voltage. I don't know how much voltage increase you can
get by adjusting it, but suspect you should easily be able to set the
supply for 14.2 volts.
I set my Alinco DM-330 supply (front panel voltage adjusment) to 14.2
and it works fine that way with both my K2 and my TS-570D.
Bob, N7XY
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