"John Smith" wrote in message
...
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


Silicone oils are excellent from a health standpoint and usually very good
from a flammability standpoint. However, the Cantenna relies on natural
convection of the oil for cooling and the higher viscosity of commonly
available silicone oils will limit the power handling capability of the
Cantenna. Remember that the Cantenna must be de-rated when used for long
duty cycles, and a high viscosity oil will lower the power rating still
more. Also remember that silicone oils are not cheap (and my buddy at Dow
would only send me small samples).

I would suggest using modern RF terminations made by Bourns and other
companies. These are designed to be bolted to a large heatsink. The
CHF9838CNF series is rated for 50 ohms, 250 watts, VSWR below 1.1 from DC
to 2.2 GHz. It only costs $27.50 in single lot quantities. I think this
is higher than the continuous rating of the Cantenna. I don't know for
sure as I disposed of my Cantenna years ago. Digi-Key sells these Bourns
terminations if you want one.

I had used transformer oil given to me by the local electric cooperative.
I didn't learn until a few years later that the oil was contaminated with
Aroclor, a PCB oil. Proper disposal was easy for me as I then worked in
the research labs of a major chemical company that had an EPA licensed
incinerator specifically rated for PCB destruction. Even so, I had to
repackage the oil into special disposal bottles and give the incinerator
operators instructions that only one of the bottles could be burned daily.
Before anyone asks can they send their oil to me for disposal, I left that
company over 10 years ago and am now retired, so the answer will be no.

I did quite a bit of research on trade names of PCB containing oils. In
fact, the EPA's list found at
http://www.epa.gov/epawaste/hazard/t...bs/aroclor.htm is partly a
result of my study. About a third of the trade names on this list were
unknown to the EPA until I provided them to the Atlanta EPA office.

Barry L. Ornitz, PhD WA4VZQ

NoSPAM wrote:


I would suggest using modern RF terminations made by Bourns and other
companies. These are designed to be bolted to a large heatsink. The
CHF9838CNF series is rated for 50 ohms, 250 watts, VSWR below 1.1 from
DC to 2.2 GHz. It only costs $27.50 in single lot quantities. ...Digi-Key sells these
Bourns terminations if you want one.

Thanks, Doc.

That's News I Can Use.

NoSPAM wrote:

...
Silicone oils are excellent from a health standpoint and usually very
good from a flammability standpoint. However, the Cantenna relies on
natural convection of the oil for cooling and the higher viscosity of
commonly available silicone oils will limit the power handling
capability of the Cantenna. Remember that the Cantenna must be de-rated
when used for long duty cycles, and a high viscosity oil will lower the
power rating still more. Also remember that silicone oils are not cheap
(and my buddy at Dow would only send me small samples).
...
unknown to the EPA until I provided them to the Atlanta EPA office.

Barry L. Ornitz, PhD WA4VZQ

Well, yeah ...

However, the last silicone oil I purchased was at an auction. I was a
cannery being close, about 2-3 years ago. It was a 5 gal. tin, seems to
be about 10w-15w (no zahn cup to even begin guessing viscosity with); it
was $20.00, if I remember correctly. (a lucky fluke, I admit, and food
grade to boot!)

However, if I had to choose a 2nd, easily available source, and cheap, I
would get some pint bottles of 100% silicone spray used for protecting
seats, dashboards, panels, etc. in autos. At $1.88 + tax--a pint, a
gallon would be under $20.00. And, again, a cheap easily available
source to all--without shipping costs ...

Presently, I used the auctioned silicone I purchased, on my car
interior, tires, etc. ... lol

You know, if everyone has so many problems in doing the simplest things,
makes one wonder what they do when they hit a real snag! scratches-head

Regards,
JS

Barry L. Ornitz, PhD WA4VZQ wrote:

Silicone oils are excellent from a health standpoint...

John Smith wrote:

However, the last silicone oil I purchased was at an auction... and
food grade to boot!)


I am a bit puzzled. IIRC, the silicone in women's breast implants
would/could/did leak and cause fairly serious health problems. Yet, Dr.
Ornitz says "Silicone oils are excellent from a health standpoint" and
Mr. Smith says: "food grade".

Could anyone take a shot at explaining this apparent dichotomy?

Inquiring minds want to know.

Billy Burpelson wrote:

Barry L. Ornitz, PhD WA4VZQ wrote:

Silicone oils are excellent from a health standpoint...

John Smith wrote:

However, the last silicone oil I purchased was at an auction... and
food grade to boot!)


I am a bit puzzled. IIRC, the silicone in women's breast implants
would/could/did leak and cause fairly serious health problems. Yet, Dr.
Ornitz says "Silicone oils are excellent from a health standpoint" and
Mr. Smith says: "food grade".

Could anyone take a shot at explaining this apparent dichotomy?

Inquiring minds want to know.

There are plenty of things that are inert when passing through the gut
that will be lethal if introduced directly into the body.

Billy Burpelson wrote:

Barry L. Ornitz, PhD WA4VZQ wrote:

Silicone oils are excellent from a health standpoint...

John Smith wrote:

However, the last silicone oil I purchased was at an auction... and
food grade to boot!)


I am a bit puzzled. IIRC, the silicone in women's breast implants
would/could/did leak and cause fairly serious health problems. Yet,
Dr. Ornitz says "Silicone oils are excellent from a health standpoint"
and Mr. Smith says: "food grade".

Could anyone take a shot at explaining this apparent dichotomy?

Inquiring minds want to know.

Kenneth P. Stox wrote:

There are plenty of things that are inert when passing through the gut
that will be lethal if introduced directly into the body.

And swallowing something is -not- being "introduced directly into the
body"? I would have thought otherwise...

Billy Burpelson wrote:

...
And swallowing something is -not- being "introduced directly into the
body"? I would have thought otherwise...

I mean, "Come on!" You have to ask that?

A hypodermic needles injection is "directly." A swallowed substance is
directly introduced into the digestive tract, where it is the
assimilated into the blood ...

Another example? A bullet from a gun is "directly" introduced into the
body, a swallowed bullet is not ...

Regards,
JS

Billy Burpelson wrote:

...
And swallowing something is -not- being "introduced directly into the
body"? I would have thought otherwise...

John Smith wrote:

I mean, "Come on!" You have to ask that?

A hypodermic needles injection is "directly." A swallowed substance is
directly introduced into the digestive tract, where it is the
assimilated into the blood ...

Huh? Are we both saying the same thing?

If a substance is injected by a hypodermic needle and then 'assimilated
into the blood', how is that different from you saying "A swallowed
substance is directly introduced into the digestive tract, where it is
the[n] assimilated into the blood ..."?

Seems like it gets into the blood stream (and is thus circulated around
the entire body) in -either- case. So your point is...?

Back to my original, bottom line question: is silicone in the blood
stream good for you or bad for you? (and yes, I DO have to ask, because
your response seems to make no sense).

Regards,
Billy

"Billy Burpelson" wrote in message
...

Billy Burpelson wrote:

Barry L. Ornitz, PhD WA4VZQ wrote:

Silicone oils are excellent from a health standpoint...

John Smith wrote:

However, the last silicone oil I purchased was at an auction... and
food grade to boot!)


I am a bit puzzled. IIRC, the silicone in women's breast implants
would/could/did leak and cause fairly serious health problems. Yet, Dr.
Ornitz says "Silicone oils are excellent from a health standpoint" and
Mr. Smith says: "food grade".

Could anyone take a shot at explaining this apparent dichotomy?

Inquiring minds want to know.

Kenneth P. Stox wrote:

There are plenty of things that are inert when passing through the gut
that will be lethal if introduced directly into the body.

And swallowing something is -not- being "introduced directly into the
body"? I would have thought otherwise...


There are other ways to introduce crisco into the body, especially around
tax time! :-))

On Jan 2, 2:16*pm, "Kenneth P. Stox" wrote:
Billy Burpelson wrote:

Barry L. Ornitz, PhD * WA4VZQ wrote:

Silicone oils are excellent from a health standpoint...

John Smith wrote:

However, the last silicone oil I purchased was at an auction... and
food grade to boot!)

I am a bit puzzled. IIRC, the silicone in women's breast implants
would/could/did leak and cause fairly serious health problems. Yet, Dr.
Ornitz says "Silicone oils are excellent from a health standpoint" and
Mr. Smith says: "food grade".

Could anyone take a shot at explaining this apparent dichotomy?

Inquiring minds want to know.

- There are plenty of things that are inert when
- passing through the gut that will be lethal if
- introduced directly into the body.

Yeah - You can Sallow a FMJ Bullet
and 'pass-it' quite nicely.

-fwiw- a Solid Lead Bullet might produce
different results in the 'gut'.

But that same FMJ Bullet 'passing-thru'
the Body could be very Lethal.