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Dummy Load for Class E TX Project




 
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Author Topic: Dummy Load for Class E TX Project  (Read 2623 times)
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Tom WA3KLR
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« on: December 10, 2005, 09:00:02 AM »

Last evening I built a dummy load for power supply and pulse-width modulator testing of my Class E transmitter project.

The dummy load resistors were taken from my old heat pump indoor unit when the system was replaced 3 years ago. I saved 4 of the 6 electric back-up heating elements. They are about 5 kW each, around 11 Ohms. I built them into a little frame made of some heavy aluminum angle stock and 1" x 2" firring strip stock. Convection cooling only in new application.

With these 4 resistor banks, 10 values are possible - 2.75, 3.7, 5.5, 11, 14.7, 16.5, 22, 27.5, 33, and 44 Ohms. The closest for my purposes is 5.5 and 11 Ohms.

The assembly is 15 3/4" tall.

Photo below:


* dummy03.JPG (65.08 KB, 381x463 - viewed 535 times.)
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73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
W1IA
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« Reply #1 on: December 10, 2005, 11:03:45 AM »

Last evening I built a dummy load for power supply and pulse-width modulator testing of my Class E transmitter project.

The dummy load resistors were taken from my old heat pump indoor unit when the system was replaced 3 years ago. I saved 4 of the 6 electric back-up heating elements. They are about 5 kW each, around 11 Ohms. I built them into a little frame made of some heavy aluminum angle stock and 1" x 2" firring strip stock. Convection cooling only in new application.

With these 4 resistor banks, 10 values are possible - 2.75, 3.7, 5.5, 11, 14.7, 16.5, 22, 27.5, 33, and 44 Ohms. The closest for my purposes is 5.5 and 11 Ohms.

The assembly is 15 3/4" tall.

Photo below:


nice job Tom

Brent
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WA1GFZ
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« Reply #2 on: December 10, 2005, 07:32:03 PM »

KOOL!
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