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Re: [TowerTalk] Oil For Dummy Load

To: "'Al Kozakiewicz'" <akozak@hourglass.com>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Oil For Dummy Load
From: "Gary Schafer" <garyschafer@largeriver.net>
Date: Sun, 29 Nov 2015 21:51:25 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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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