Dual purpose dummy load

[W8EJO]

Heat your soup while tuning up your rig.

 230V ~ 1kW electric hot plate

http://nandustips.blogspot.in/2011/02/handy-1-kw-hf-dummy-load.html

[WQ9E]

Terry,

A non/softly glowing version of the old light bulb dummy load  

Most vintage rigs will be OK with it but the resistance will vary significantly between cold and full rated power.  I think I will stick with a Cantenna and leave the hot plate back in my college frat house days.

[W8EJO]

Rodger,

Per the author, VU2NAN, "The temperature coefficient of resistance of Nichrome is only 0.0004. So the resistance change from room temperature to 'red hot' will be negligible"

I'm shopping for one today

[ka1bwo]

I just wonder how resistive the load is on 10 meters ?
Joe

[WD5JKO]

 The hot plate made to run on 220W with a 1KW element will indeed be very close to 50 ohms. Some reactance though would be seen though going up in frequency. For a fixed band use, say 20 meters, I suppose a L-C match could be made to tune out the reactance on that band, or just run through an antenna tuner. 

  A 1 KW hotplate made to run off 120 vac will be close to 14 ohms....use three in series for 52 ohms @ 3KW!

  I would bypass the temperature control circuit though.

  I once had a grocery bag of 47K 1/2w carbon comp resistors. I made ten 100 piece rings stacked one on top of the other, and immersed in a gallon bucket of ATF. It came out at about 55 ohms, but the shunt capacitance was huge! Had to use my tuner on 40 m on up. 

Jim
Wd5JKO