This is a multi-part message in MIME format.
------=_NextPart_000_0007_01C149EA.EB67AE20
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
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
------=_NextPart_000_0007_01C149EA.EB67AE20
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!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">
<META content=3D"MSHTML 5.50.4134.100" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<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> I purchased an =
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 =
didn't=20
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 oil=20
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=20
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></BODY></HTML>
------=_NextPart_000_0007_01C149EA.EB67AE20--
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|