Heathkit dummy load

[Bill Coleman AA4LR]

On 5/21/99 11:52, Jordan Arndt at jordana at nucleus.com wrote:

>Yes a PCB free transformer oil is much better, ...

PCB-free transformer oil does not have the same heat transfer efficiency
as PCB-laden transfer oil.

>as Mineral oil has
>impurities which will eventually permeate into the carbon resistor, and
>cause the actual resistance, hence SWR of the HN-31 to change over
>time...

Not true. Mineral oil is essentially inert to the components of the
resistor. I have a dummy load that is 20 years old, and has had the same
mineral oil in it all that time. No change in resistance in that time.

>PCB's are carcinogenic....

I have a TV engineer friend who claims certain engineers have practically
swam in the stuff with no ill effects.



Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at radio.org
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe:  listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --