My "gallon size" dummy load is not a Heath, but that was inspiration for
mine. I came across a bunch of 620 ohm 20 watt carbon resistors a long
time ago.
I wired 12 of them in parallel and put them into a gallon can of mineral
oil. That dummy load still measures 51 ohms over the bands from 80 thru
10 meters with a minimal amount of inductance - and it is over 40 years
after I first built it.
I figure since it will do 240 watts in open air, in the oil, it should
take the legal limit for relatively short periods, but I have not
subjected it to more than 500 watts.
Yes, I have heard stories about how the Heath resistors changed value,
but my 'substitute' has not changed over the years.
73,
Don W3FPR
On 9/17/2015 10:36 PM, Fred Jensen wrote:
Strangely, these non-inductive resistors do not last forever. When I
came home from SE Asia to Houston in 67, I filled my Heath with
mineral oil [interesting story on a Sunday], and it measured 51 ohms
DC. Today, it measures 74 ohms DC.
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