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

[Cathy James]

Tom, that's a great idea,and it never occurred to me.  However, it will 
probably be years before I need to change the voltage again, so at this 
point I doubt I'll bother. Thanks for the tip, though!

Cathy

Tom Hammond wrote:
> 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