Gary K4FMX asked only about the derating chart.
Fortunately for myself, oil viscosity is immaterial
since my HN31 won't ever see more than ~ 100W again
and I'll never need to change the FREE transformer oil.
Instead, for high power stuff, I use my scrap parts
1500W (100% D/C) DL that uses small flange-mounted
RF resistors. It's actually smaller than my HN-31.
vy 73,
Bryan WA7PRC
----- Original Message -----
> From: D. Scott MacKenzie
> To: Bryan WA7PRC
> Sent: Tuesday, December 1, 2015
> Subject: RE: [TowerTalk] Oil For Dummy Load
>
> Unfortunately they don't give the viscosity of the oil. Most transformer
> oil is mineral at a viscosity of 10-20 cst @ 40C. However, mineral oil can
> range from 10-1000 cSt. An identical viscosity mineral oil would perform in
> an identical fashion.
>
>
> -----Original Message-----
> From: Bryan WA7PRC
> Sent: Tuesday, December 01, 2015 12:53 AM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Oil For Dummy Load
>
> The chart is here: http://www.tinyurl.com/wa7prc-cantenna
>
> My scrap parts 1500W dummy load is here: http://www.tinyurl.com/wa7prc-dummy
> Though all the parts were free to me, outfits such as Henry Radio
>
> (http://stores.ebay.com/Henry-Radio) sell RF power resistors for reasonable
> cost on ebay.
> vy 73 es gl,
> Bryan WA7PRC
>
>> Date: Mon, 30 Nov 2015
>> From: Gary K4FMX
>> Subject: Re: [TowerTalk] Oil For Dummy Load
>>
>> There used to be a chart on the side of the Heath cantena that showed
>> the difference between transformer oil and mineral oil as far as
>> power/time. As I remember it was rather a significant difference.
>>
>> 73
>> Gary K4FMX
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