[Elecraft] Re: Elecraft Digest, Vol 31, Issue 3

[Tom Hammond]

Cathy:

For future possible adjustments... REMOVE the pot and reinstall it on 
the SOLDER SIDE of the PC board... then it'll be on top where you can 
easily access it!  Saves a LOT OF HASSLE! And it's a SIMPLE one-time 
task to perform.

If you do a lot of voltage adjustment (though few of us do), you 
could always remove that PC-mount pot and replace it with a 
chassis-mount pot (installed on the back of the case) attached to the 
PC board via three wires.

73,

Tom   N0SS

At 07:44 AM 11/3/2006, you wrote:
>elecraft-request at mailman.qth.net wrote:
>>The K2 has a series
>>diode in the power supply line for reverse polarity protection - that diode
>>drops about .2 volts.
>>
>>What that means is: to obtain 13.8 volts at the battery terminals, one must
>>connect a supply of 14.0 volts to the K2 to maintain full charge on the
>>battery.
>>
>>There is an intenal pot in the Astron to adjust the output voltage, so it
>>may be a simple matter to increase the Astron voltage - locating the correct
>>pot may be more of a challenge, be certain you adjust the proper pot.
>>
>>73,
>>Don W3FPR
>>
>I adjusted my Astron to 14.1V output using the internal pot, but be 
>warned that it is a semi-major project.  The pot is on the underside 
>of the small floating board IIRC; every time I wanted to adjust it, 
>I had to short out the large electrolytic capacitor in the Astron, 
>unscrew the board, pull it up, make a guess as to how much to adjust 
>it, screw it back down, power up the supply, check the voltage, see 
>that it's still wrong, power down, short out the cap, unscrew the board....
>
>There may be an easier way to do it but it wasn't obvious.  I'd 
>guess that it took me a dozen iterations.  I don't ever want to mess 
>with it again.
>
>What was Astron thinking burying the pot where it can't be safely 
>and readily accessed just by removing the cover???
>
>Cathy
>N5WVR
>
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