[Elecraft] ASTRON PS and KX1

[Bob Nielsen]

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