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----- Original Message -----=20
From: Mike Sawyer=20
To: Ken Barber=20
Sent: Sunday, September 30, 2001 8:50 PM
Subject: Re: [AMPS] transformer oil
Ken,
First and foremost, the oil in the dummy load, may contain PCB's or =
Poly-Chlorinated Biphenyl's. It is said to have been a carcinogen. That =
having been said, generally dark oil means that it has been "cooked" =
pretty good. Try to locate a silicone based oil. That is what they use =
nowadays instead of the PCB type oil. If you can't locate it, mineral =
oil will do well at a lower rating. If you can find an old Heath =
'Cantenna', it can give you an idea the difference between mineral oil =
and transformer oil. I use the silicone based oil due to the fact that =
it is available at work.=20
Gud luck,
Mike(y)
W3SLK
----- Original Message -----=20
From: Ken Barber=20
To: Radio-contesting.com=20
Sent: Sunday, September 30, 2001 8:03 PM
Subject: [AMPS] transformer oil
Hi,
I purchased an old military 1000 watt dummy load at a hamfest today. =
It is quite large and has industrial size radiators. I ran 500 watts =
into it for about 5 minutes. I noticed that the input area where the =
"N" connector is fastened got quite warm, whereas the rest of the dummy =
load didn't seem to get warm at all. I opened it up and found that the =
oil is low and would not completely cover up the resistive element and =
that the oil is rather dirty. I saw in a radio handbook that =
transformer oil may be obtained from the local power company, so I will =
try them as a source. If you know of another source, please let me know =
who it is.
I know nothing about oil and heat transfer, so could someone explain =
why one could not use motor oil or mineral oil or cooking oil such as =
olive oil ? Secondly, should the transformer oil be filled right up to =
the top of the dummy load or should there be a little room for =
expansion?
73,
Ken W2DTC
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<DIV> </DIV>
<DIV style=3D"FONT: 10pt arial">----- Original Message -----=20
<DIV style=3D"BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A=20
title=3Dkc4slk@csrlink.net href=3D"mailto:kc4slk@csrlink.net";>Mike =
Sawyer</A> </DIV>
<DIV><B>To:</B> <A title=3Dkenw2dtc@home.com =
href=3D"mailto:kenw2dtc@home.com";>Ken=20
Barber</A> </DIV>
<DIV><B>Sent:</B> Sunday, September 30, 2001 8:50 PM</DIV>
<DIV><B>Subject:</B> Re: [AMPS] transformer oil</DIV></DIV>
<DIV><BR></DIV>
<DIV>Ken,</DIV>
<DIV> First and foremost, the oil in the dummy load, =
may=20
contain PCB's or Poly-Chlorinated Biphenyl's. It is said to have been a=20
carcinogen. That having been said, generally dark oil means that it has =
been=20
"cooked" pretty good. Try to locate a silicone based oil. That is what =
they use=20
nowadays instead of the PCB type oil. If you can't locate it, mineral =
oil will=20
do well at a lower rating. If you can find an old Heath 'Cantenna', it =
can give=20
you an idea the difference between mineral oil and transformer oil. I =
use the=20
silicone based oil due to the fact that it is available at work. </DIV>
<DIV>Gud luck,</DIV>
<DIV>Mike(y)<BR>W3SLK</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dkenw2dtc@home.com href=3D"mailto:kenw2dtc@home.com";>Ken =
Barber</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Damps@contesting.com=20
href=3D"mailto:amps@contesting.com";>Radio-contesting.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, September 30, =
2001 8:03=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [AMPS] transformer =
oil</DIV>
<DIV><BR></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D4>Hi,</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D4> I purchased =
an=20
old military 1000 watt dummy load at a hamfest today. =
It is=20
quite large and has industrial size radiators. I ran 500 =
watts into=20
it for about 5 minutes. I noticed that the input area where =
the "N"=20
connector is fastened got quite warm, whereas the rest of the dummy =
load=20
didn't seem to get warm at =
all. </FONT></STRONG><STRONG><FONT=20
face=3D"Comic Sans MS" size=3D4>I opened it up and found that the oil =
is low and=20
would not completely cover up the resistive element and that the=20
oil is rather =
dirty. </FONT></STRONG><STRONG><FONT=20
face=3D"Comic Sans MS" size=3D4>I saw in a radio handbook =
that transformer=20
oil may be obtained from the local power company, so I will try =
them as a=20
source. If you know of another source, please let me know who it =
is.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D4> I know =
nothing about oil=20
and heat transfer, so could someone explain why one could not use =
motor oil or=20
mineral oil or cooking oil such as olive oil ? Secondly, =
should the=20
transformer oil be filled right up to the top of the dummy =
load or should=20
there be a little room for expansion?</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D4>73,</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D4>Ken =
W2DTC</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS"=20
size=3D4></FONT></STRONG> </DIV></BLOCKQUOTE></BODY></HTML>
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