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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+HN\-31\s+Heathkit\s+Dummy\s+Load\s*$/: 6 ]

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1. [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: <jcowens@NETSCAPE.COM>; Date: Tue, 4 Apr 2006 09:22:57 -0700 (PDT); Is anyone familiar enough with the HN-31 Heathkit Dummy Load (History Lesson)to know how much power you can run to this thing in other than "key down". I don't know if it has transformer oil or Miner; /archives//html/Towertalk/2006-04/msg00070.html (7,292 bytes)
2. Re: [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: el34guy@aol.com; Date: Tue, 04 Apr 2006 12:34:53 -0400; I think mfj still sells xfmr oil for their cantenna lookalike dummy load. Not sure how much you can put through it. Id go for max output.... Mark W0NCL --Original Message-- From: jcowens@NETSCAPE.COM; /archives//html/Towertalk/2006-04/msg00071.html (7,841 bytes)
3. Re: [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: Jack - K4WSB <K4WSB@arrl.net>; Date: Tue, 04 Apr 2006 13:22:37 -0400; According to the manual the HN-31 is rated at 1kw. Duty cycle is 10 minutes using transformer oil & about 2 minutes using mineral oil Check with your local power company. If you go to the facility th; /archives//html/Towertalk/2006-04/msg00074.html (7,574 bytes)
4. Re: [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Tue, 04 Apr 2006 11:25:54 -0700; The difference is due to the lower viscosity of transformer oil vs mineral oil. As the resistor heats up the oil, it rises in the can and moves to the outside walls where it cools. Lower viscosity oi; /archives//html/Towertalk/2006-04/msg00077.html (9,073 bytes)
5. Re: [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 04 Apr 2006 14:39:36 -0400; I believe it is the same as the MFJ-250 which has derating curves for both transformer oil and mineral oil. The transformer oil is rated good at 1000 watts for 10 minutes continuous, mineral oil for; /archives//html/Towertalk/2006-04/msg00078.html (8,397 bytes)
6. Re: [TowerTalk] HN-31 Heathkit Dummy Load (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 5 Apr 2006 00:16:54 -0700; John, Here is a link to the manual for the MFJ-250 "cantenna" style dummy load: http://www.mfjenterprises.com/man/pdf/MFJ-250.pdf The derating curve in this manual is identical to the derating curve; /archives//html/Towertalk/2006-04/msg00094.html (9,601 bytes)

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