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[AMPS] transformer oil

To: <amps@contesting.com>
Subject: [AMPS] transformer oil
From: Ken Barber" <kenw2dtc@home.com (Ken Barber)
Date: Sun, 30 Sep 2001 20:03:06 -0400
This is a multi-part message in MIME format.

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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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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
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<BODY bgColor=3D#ffffff>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D4>Hi,</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D4>&nbsp; I purchased an =

old&nbsp;military&nbsp;1000 watt dummy load at a hamfest today.&nbsp; It =
is=20
quite large and has industrial&nbsp;size radiators.&nbsp; I ran 500 =
watts into=20
it for about 5 minutes.&nbsp; I noticed that the&nbsp;input area where =
the "N"=20
connector is fastened got quite warm, whereas the rest of the dummy load =
didn't=20
seem to get warm at all.&nbsp;&nbsp;</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&nbsp;is&nbsp;rather dirty.&nbsp;&nbsp;</FONT></STRONG><STRONG><FONT=20
face=3D"Comic Sans MS" size=3D4>I saw in a radio handbook =
that&nbsp;transformer oil=20
may be obtained from the local power&nbsp;company, so I will try them as =
a=20
source.&nbsp; If you know of another source, please let me know who it=20
is.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D4>&nbsp; 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 ?&nbsp;&nbsp;Secondly, =
should the=20
transformer oil be filled right up to the top of the dummy load&nbsp;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>&nbsp;</DIV></BODY></HTML>

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