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

"JIMMIE" wrote in message
...

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.

That's good to know.

On Jan 1, 8:34*pm, "Bob Campbell" wrote:
"JIMMIE" wrote in message

...

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.

That's good to know.

I have a 200 watt air cooled dummy load made of 2 watt resistors. I
was curious as to how much power it could safley disipate if placed in
a gallon container of mineral oil. It seems to handle 200 watts
continuously with just a muffin fan on it.

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

On Jan 3, 12:31*am, "Bryan" wrote:
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

I used Shell Diala for years in radar systems. The last time I changed
the oil we used somrthing else, probably cheaper. The main ingredient
in all odf it is mineral oil but it has a few additives. Local PoCO
uses the same. We got some from them one time and they had a RR tank
car full of it.

Jimmie