It's time to restore the 11/45.

Chuck Guzis cclist at
Wed Feb 4 21:02:36 CST 2015

A pretty good dummy load is a globar resistor in a bucket of mineral 
oil.  Remember the Heathkit "Cantenna"?  Basically a big carbon 
resistor; still made by Kanthal-Globar today.  If you don't need a 
non-inductive load, a bunch of plain old wirewound power resistors, 
suitably cooled will do.


On 02/04/2015 06:43 PM, Jacob Ritorto wrote:
> wow, good catch, Noel. I'll pass this on to NASA ;)
> On Wed, Feb 4, 2015 at 7:56 PM, Noel Chiappa <jnc at>
> wrote:
>>      > From: Jacob Ritorto
>>      > My NASA EE buddy recommended working up an appropriate load from
>>      > regular household lightbulbs. They won't light, naturally, but you
>> can
>>      > dial in your load by simply choosing certain wattages and doing the
>> math.
>> Err, both tungsten and carbon filament incandescents have very different
>> resistance when hot (lit) and cold. To make it even more, they are of
>> opposite
>> sign: with tungsten, the resistance increases as it heats up (a nice
>> stabilizing feedback), and with carbon, it goes the other way. So if you're
>> not running enough current to light the bulb, you can't use the printed
>> watt
>> rating; you'll have to use an ohm-meter.
>>          Noel

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