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
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Al Kozakiewicz
> Sent: Sunday, November 29, 2015 8:38 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Oil For Dummy Load
>
> If they're only rated for a few seconds (yeah, they are), then the
> difference between transformer and mineral oil is probably measured in
> milliseconds - not enough to bother. The thermodynamics of a paint can
> are really not up to the application. Unless you're building or
> servicing amplifiers on a regular basis, there isn?t much more than a
> few seconds of need for full power into a dummy load on an occasional
> basis anyway. If you really need more, buy or make a real DL. If you're
> tuning into a DL (I hear some hams do this), why? I use the Cantenna
> when an amp is on the bench, which isn?t often. Otherwise it gathers
> dust. A lot of dust since I lost the plastic cap for the pressure relief
> and the thing is kind of coated in oil...
>
> I have to laugh though. I've heard time and again how unfair and
> inaccurate the stereotype of the cheap ham is.....and then there is this
> thread!
>
> I did buy an inexpensive smoke generator for testing auto EVAP systems
> recently. Basically, it is a paint can containing a wick wrapped with
> nichrome wire and an LPG regulator to supply 1 or 2 PSI of air. You put
> mineral oil in the can. The directions were poor and I filled the can up
> not really understanding that the wick at the bottom of the can was
> supposed to be above the oil level - it generates the smoke when heated.
> Before I applied compressed air, oil was oozing out of the regulator.
> What a mess! As a result, I have a surplus of USP grade mineral oil
> right now.....
>
> Best,
>
> Al
> AB2ZY
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Bryan Swadener via TowerTalk
> Sent: Sunday, November 29, 2015 9:03 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Oil For Dummy Load
>
> No, especially when you're pumping a kilowatt into a 90W-rated Globar in
> only a gallon of media that has only the tin bucket itself to transfer
> the heat to atmosphere. You need _every bit of advantage_ you can get.
> As it is, those DLs are rated a kilowatt for only a few seconds. That's
> why I stopped using my HN31 with an amplifier, and built my compact
> 1500W (100% D/C) load.
>
> Bryan WA7PRC
>
>
>
> From: D. Scott MacKenzie
> To: Bryan WA7PRC
> Sent: Sunday, November 29, 2015 5:42 PM
> Subject: RE: [TowerTalk] Oil For Dummy Load
>
> Mineral oil is a proper substitute - and not "dubious."
>
>
> -----Original Message-----
> From: Bryan WA7PRC
>
> Sent: Sunday, November 29, 2015 8:27 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Oil For Dummy Load
>
> I found one gallon of actual transformer oil for FREE (unless you count
> having to drive 2 miles to get it).Why mess around with dubious
> substitutes when it's available for FREE?
> Bryan WA7PRC
>
>
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