heathkit dummy load

[Stewart Lyon]

One of the things you have to worry about when considering transformer
oil for the Cantenna and that's PCBs.  Not sure what it means but it's
suppositively nasty stuff that was in all transformer oils about the time
Heath first came out with the HN-31. I got a gallon of it gratis from the
LA power co. and it is still in my Cantenna.  I'm afraid to open it up to
replace the power resistor with the new one I got from Ed Mosher.

I wonder if the numbers quoted by W2CNB were with "old" or "new"
transformer oil?? The "new" stuff is less efficient.  I would play it
safe and use mineral oil.

73, Stu - W6CUX
Winnetka, CA
ARRL Life Member

On Thu, 20 May 1999 22:59:13 -0400 "Robert A. Taylor"
<rat1932 at TWCNY.RR.COM> writes:
>The difference in heat dissipation between mineral oil and transformer
>oil for practical uses of a dummy load are not  really significant.
>Consider power input vs. time power is applied to the load; for a given
power
>input here are the times the Cantenna can dissipate it for mineral oil
and
>then transformer oil.
>
>375 w — both are the same at 30 minutes.
>500 w — 19 min vs. 22 min.
>750 w — 5 min vs. 12 min.
>1000 w — 2 min vs. 9 min.
>
>This data is from the Heath Cantenna specification dated 11-9-62.
>
>73's Bob, W2CNB
>
>

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