[Elecraft] Extremely light KX1 portable external power supply

Tue Jan 6 18:09:06 2004

Hi Bruce:

This is quite an elegant solution.  I was wondering about simply=20
removing one of the 3 battery holders and replacing it with a 9 volt=20
battery and holder.  It may not fit - may be the answer !

73, Jamie
WB4YDL

On Jan 6, 2004, at 3:11 PM, Bruce Prior wrote:

> I was rooting around a local drug store last night and discovered a=20
> new way to provide the KX1 with an extremely light portable external=20=

> power supply.  I spied a 6 V Duracell=AE 28L lithium battery.  I found=20=

> that each 28L is half the length of an AA cell and very slightly=20
> smaller in diameter.  I trundled over to a RadioShack and found a=20
> single-cell AA holder (RadioShack #270-401A).  Back in the drug store,=20=

> I bought two of the 28L cylinders.  They're not cheap:  I had to pay=20=

> $8.99 apiece.  I loaded the single holder with both 28L batteries in=20=

> series.  Since their diameters are just a shade smaller than AA cells,=20=

> I inserted a single layer of the strong fiber paper used for a credit=20=

> card holder.  (I've forgotton the proper name of the stuff:  it's also=20=

> used for Priority and Express Mail envelopes.)  Now the two 28L's are=20=

> nice and snug.  The output voltage measures 12.55 Vdc;  the KX1 showed=20=

> slightly less than 12 Vdc on its internal voltmeter.  I've forgotten=20=

> the exact figure, and my KX1 is out of my hands for a week or so.
>
> Could the 28L's be used inside the KX1?  Well, yes, with five=20
> conducting dummy spacers in the other five AA slots it should work=20
> fine.  Another radical approach would be to rewire each of the six=20
> internal AA slots in the KX1 so that they were in parallel instead of=20=

> in series.  Buying twelve 28L's would be very expensive.  I'll stick=20=

> with my simple external version, thank you!
> 72,
> J. Bruce Prior N7RR
> Kairos Research
> 853 Alder Street
> Blaine, WA  98230-8030
> 360-332-6046
>
> Patronize tobacco-free enterprises and institutions.
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