Heathkit dummy load

[Jordan Arndt]

Misic, George J. wrote:
>
> Stu and Heathens,
>
> While I would not suggest bathing in PCB oil, it is not the health hazard
> that it was made out to be.  Its use in high power distribution transformers
> is MANDATED in some European countries to this day.  Simply use caution,
> minimize exposure [as you would with any petroleum product], and clean up
> when you are done.  73.
>
> George KE8RN
>
> > -----Original Message-----
> > From: Stewart Lyon [SMTP:stu_w6cux at juno.com]
> > Sent: Thursday, May 20, 1999 11:47 PM
> > To:   HEATH at LISTSERV.TEMPE.GOV
> > Subject:      Re: heathkit dummy load
> >
> > 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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Yes a PCB free transformer oil is much better, 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... PCB's are carcinogenic.... 73 de Jordan...

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