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Author Topic: Oil for dummy load  (Read 1169 times)
KG6KEC
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Posts: 9




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« on: October 09, 2005, 02:36:52 PM »

I just purchased a dummy load build into a empty 1 gallon paint can.  What type of oil do I use?

73's
JC
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K7KBN
Member

Posts: 3227




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« Reply #1 on: October 09, 2005, 03:33:25 PM »

Best thing would probably be to see your local electrical utility and ask for a gallon of transformer oil.  More often than not they'll have a few large nearly empty barrels of the stuff and they'll be happy to be rid of a gallon of it - probably free.

If not, mineral oil from a drugstore is almost as good.  Don't expect this to be as inexpensive as "free", though!
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73
Pat K7KBN
CWO4 USNR Ret.
WA9SVD
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Posts: 2198




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« Reply #2 on: October 10, 2005, 12:07:26 AM »

Transformer oil (new, unused) is the best.  (See previous reply.)Beware of old, or unidentified oil, as it may contain PCB's!
    Mineral oil is the next best bet.  And if you have a local "Feed and Grain" type store anywhere near you (yes, even in the "big" city) you can often get it by the gallon (how convenient!) as vet grade mineral oil, at a much lower price than buying 8 pints at the local drug store.  (To say nothing of the funny looks...)

    Motor oil is not recommended (at least not for long term use,) as the volatility and flash point is often lower than mineral oil, and the additives will corrode the structure of the resistor used in the dummy load.  (ARRL Handbook, 1988, CHapter 34, page 22-23.)  The low volatility and viscosity issues also apply to "vegetable oil" or cooking oil of any type, which can also become rancid.
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WA4PTZ
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Posts: 528




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« Reply #3 on: October 10, 2005, 08:40:59 AM »

I used Quaker State 10w 40 in mine. Some folks use
mineral oil. I never had any swr or heat problems
with mine.
73 - Tim
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KE4DRN
Member

Posts: 3746




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« Reply #4 on: October 11, 2005, 08:51:53 PM »

hi,

Stop by the farm supply or vet supply and get a gallon of mineral oil.

They use it on the farms for the animals so you won't get funny looks from the drug stores and also save on the shipping from the online stores.

73 james
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KG6KEC
Member

Posts: 9




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« Reply #5 on: October 12, 2005, 03:13:06 PM »

Thank you Guys for help.
73's
k6fsp/kg6kec
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W3OZ
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Posts: 6


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« Reply #6 on: October 13, 2005, 09:51:47 AM »

I have used automatic transmission oil in my paint can dummy load for many years. It is cheap and seems to work with no corrosion of the can or components. Considering how hot transmissions get under load, I am sure it is capable of handling 1500 watt amps.
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