KC8QJP wrote:
a crisco can works well

When length/dia ratio of the waveguide is optimum, 31mm ant, proper
distance from ant-feed to back of can--the most bang for the size/buck ...

Regards,
JS

John Smith wrote:
KC8QJP wrote:
a crisco can works well

When length/dia ratio of the waveguide is optimum, 31mm ant, proper
distance from ant-feed to back of can--the most bang for the size/buck ...

Regards,
JS

http://www.eham.net/forums/Elmers/1574

Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some
other reality ...

Regards,
JS

"John Smith" wrote in message
...
Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some other
reality ...

I was just happy to see someone in that thread pop up with the warning about
PCBs in old transformer oil. I couldn't believe someone said they actually
got power company transformer oil!

On Jan 1, 6:48*pm, "Bob Campbell" wrote:
"John Smith" wrote in message

...

Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some other
reality ...

I was just happy to see someone in that thread pop up with the warning about
PCBs in old transformer oil. * I couldn't believe someone said they actually
got power company transformer oil!

Nothing wrong with PoCo oil. They havent used PCBs in years. We use
the same stuff at work made by Shell . Its just mineral oil with a few
additives.

Jimmie

Bob Campbell wrote:
"John Smith" wrote in message
...
Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some
other reality ...

I was just happy to see someone in that thread pop up with the warning
about PCBs in old transformer oil. I couldn't believe someone said
they actually got power company transformer oil!

Why should you be surprised about power company oil. They haven't had
PCB's for years. Even the pole pigs have clean (?) oil in them.

Dave WD9BDZ

Bob Campbell wrote:
John Smith wrote:
Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some
other reality ...

I was just happy to see someone in that thread pop up with the warning
about PCBs in old transformer oil. I couldn't believe someone said they
actually got power company transformer oil!
After I refurbished my Cantenna (needed a new globar resistor and cleaning),
I was able to get a gallon from my local power company (free gratis). It
took a few phone calls to find the supervisor of the transformer shop. At
the rate their pump runs, the trick was getting /only/ one gallon!

I considered mineral oil but learned transformer oil has better thermal
characteristics. I now have a homebrew air-cooled dummy load that will
handle over a kilowatt continuously.

Bryan WA7PRC

Transformer oil.

Try your local power company. typically they will either sell it to
you, or, sometimes when they find out that you only need a gallon or
so, they'll just give it to you. Mine did.
- 'Doc

wrote:
Transformer oil.

Try your local power company. typically they will either sell it to
you, or, sometimes when they find out that you only need a gallon or
so, they'll just give it to you. Mine did.
- 'Doc

No one knows about silicone oils? Break down is a few hundreds of
degrees, good thermal conductivity, ... benign to all components,
including any gaskets, I can possibly think of, etc. Also, if you are
into health/toxic concerns, purchase a food grade ...

Regards,
JS

On Thu, 1 Jan 2009 15:49:11 -0800 (PST), wrote:


Transformer oil.

Try your local power company. typically they will either sell it to
you, or, sometimes when they find out that you only need a gallon or
so, they'll just give it to you. Mine did.
- 'Doc

You still on West Madison?

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