----- Original Message -----
From: "Joe Crawford" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio in the Amateur Service"
<amradio@mailman.qth.net>
Sent: Thursday, May 15, 2008 9:34 PM
Subject: Re: [AMRadio] Dummy Load
I made a mistake about 35 years ago buying some "non-inductive resistors
for a dummy load. The only place they were non-inductive was at 60 Hz. The
carborundums are not in the category. IIRC, the PEP output would be 4 times
the carrier with 100% modulation, hence, a kW out of carrier(which is too
much for amateur purposes) would be 4 kW out. This is why the 375 watt
level gives 1500 watts PEP(thanks to the 1990 power reduction[sarcasm
inserted].
Joe W4AAB
----- Original Message -----
From: "John coleman" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'"
<amradio@mailman.qth.net>
Sent: Thursday, May 15, 2008 4:36 PM
Subject: RE: [AMRadio] Dummy Load
Hi Rick:
Some time ago I located 12 - 600 ohm 100 watt or more non inductive
resistors. I purchased them from http://www.goldmine-elec.com/. They are
a
surplus dealer. My plan was to build a dummy load by paralleling all of
them in an air vented box but I never got to it. Some day I will. In the
mean time that is what I recommend for you to look for. These are long
(maybe 10 - 12") snap-in resistors about 1" diameter made of "carborundum"
or something like that, with silvered ends for snapping into large 1"
sockets on standoffs.
Good Luck
John
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick Brashear
Sent: Thursday, May 15, 2008 1:35 PM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: [AMRadio] Dummy Load
I know this has been beaten to death many times, but for the sake of an
old
man with a bad memory could we discuss the most economical (very
important)
way to provide a dummy load for testing a broadcast transmitter. I have a
few Cantennas, but they get hot real quick at 1000 watts and I'd like
something I could be a little more confident in. If I were to use the
proper number of series/parallel non-inductive resistors at say 100 watts
each, what kind of support system would be best to insure at least a one
minute key down time? Would immersing them in oil or attaching them to
heat
dissipating metal with a blower be the better choice?
Thanks for any and all advice you may offer..
Rick/K5IAR
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