heathkit dummy load

[Multi-Volti Devices]

Hello:

No PCB's (polychlorinated biphenyls?) in use (in USA) since late 1970's. If
this helps anyone date their old Cantenna contents...

I got one from a Heath Co. Salvage sale when all was being cannibalized in
BH. So who knows...

Murray
-----Original Message-----
From: Stewart Lyon <stu_w6cux at JUNO.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Thursday, May 20, 1999 11:51 PM
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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