On Mon, 2009-06-08 at 11:37 -0400, Harry Coates wrote:
> Hello to all, This is kinda off topic.. I'll put it on topic.. I use my
> Pegasus for portable operation when camping..
> I use the internal 12v system in the camper from the battery side for a power
> supply.. The battery charging part of the converter quite working..
> I found the problem, the big ballast resistor went open.. It's one of those
> big white ceramic 50w .150 ohm units..
> You just can't find those thing at the corner store..
> Why do these manufacturers choose them?? Something I don't know?? I can get a
> 50w 1 ohm
> old brown wire wound one.. That should work..
Except that at 20 amps the .15 ohm resistor drops 3 volts while the 1
ohm resistor drops 20 volts. Look at www.mouser.com for a .15 ohm 50
watt resistor. Else you need about 7 1 ohm 7 watt resistors in parallel.
> Camping season is upon us up here!!
> (TEN TEC FOREVER AND RTTY TOO)
> WA8HC@ arrl.net
73, Jerry, K0CQ
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