> I purchased an old military 1000 watt dummy load at a hamfest today. It
>is quite large and has industrial size radiators. I ran 500 watts into it
>for about 5 minutes. I noticed that the input area where the "N"
>connector is fastened got quite warm, whereas the rest of the dummy load
>didn't seem to get warm at all. I opened it up and found that the oil is
>low and would not completely cover up the resistive element and that the
>oil is rather dirty. I saw in a radio handbook that transformer oil may
>be obtained from the local power company, so I will try them as a source.
>If you know of another source, please let me know who it is.
> I know nothing about oil and heat transfer, so could someone explain why
>one could not use motor oil or mineral oil or cooking oil such as olive
>oil ? Secondly, should the transformer oil be filled right up to the top
>of the dummy load or should there be a little room for expansion?
// I use Mobil-1 five-wt. synthetic oil in my Bird dummy load. In that
model, the oil lever should be just up to the filler hole with the load
in the normal config.
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
FAQ on WWW: http://www.contesting.com/FAQ/amps
Administrative requests: amps-REQUEST@contesting.com