Handy 1 kW HF Dummy Load

[vu2nan]

Test equipment from the kitchen!

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

73,

Nandu.

 

[Captain Kilowatt]

Hard to say what the actual impedance is when operating at HF but it is likely good enough for a tube transmitter or amplifier. Back when I was in broadcasting we had a couple home made dummy loads for our 1 Kw AM transmitters. One used two oven elements mounted wired in series on the wall in a V shape and another used two large stove top elements also wired in series. The stove top elements only required a very small home made coil and a single capacitor to make it a pure 50 ohms on the high end of the AM broadcast band. Both loads would take 1 Kw at full modulation making it 4 Kw pep. Not sure what they would be like on HF but with the proper L/C it should work anywhere.

 

[vu2nan]

Hard to say what the actual impedance is when operating at HF but it is likely good enough for a tube transmitter or amplifier. Back when I was in broadcasting we had a couple home made dummy loads for our 1 Kw AM transmitters. One used two oven elements mounted wired in series on the wall in a V shape and another used two large stove top elements also wired in series. The stove top elements only required a very small home made coil and a single capacitor to make it a pure 50 ohms on the high end of the AM broadcast band. Both loads would take 1 Kw at full modulation making it 4 Kw pep. Not sure what they would be like on HF but with the proper L/C it should work anywhere.

Hi OM,

That's interesting!

Many thanks,

73,

Nandu.

 

[Heavy Metal]

Wow, post some pics and also parts list please.

 

[vu2nan]

Broken link rectified.

https://nandustips.blogspot.com/2011/02/handy-1-kw-hf-dummy-load.html

73,

Nandu.