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Re: [TenTec] Kinda OT

To: tentec@contesting.com
Subject: Re: [TenTec] Kinda OT
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 08 Jun 2009 11:01:31 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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!!
> Harry 
> WA8HC@ arrl.net 
73, Jerry, K0CQ

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