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Questions tagged [dummy-load]

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2
votes
3answers
113 views

Does a paint-can dummy load have high voltage on the metal can? Would an insulated container be better?

I've seen many plans for 50 Ohm dummy loads in paint cans, such as the one here: https://www.nonstopsystems.com/radio/frank_radio_antenna_dummy.htm. I've already assembled a functional dummy load, but ...
3
votes
2answers
160 views

Identify this “large TNC” coax connector

I have recently acquired a nice looking dummy load on military surplus sale. Being relatively new to the hobby, I assumed the connector on it was something common. Turns out it is not. So far nobody ...
1
vote
1answer
49 views

Diplexer termination?

When using a 2M/70cm diplexer for low-pass filtering (or with only one antenna on one of the two "outputs"), should the unused connection be left open, or terminated? (using a suitable impedance, ...
7
votes
1answer
992 views

How do I know if my dummy load is working?

I understand why a dummy load is used, but (aside from it getting hot) how do I know if it's doing it's job and doing it's job well? In my specific case, I'm using a Hack RF One SDR and a Souked SMA ...
3
votes
1answer
608 views

Using wirewound resistors in a dummy load

I have a bunch of high-wattage 50 ohm resistors lying around, but they are wirewound. If I use them as a dummy load for transmitters 144 MHz and down, how bad would that be? Since they probably will ...
6
votes
2answers
1k views

Dummy load construction and heat dissipation

I'm building my own dummy load, consisting of resistors submerged in liquid paraffin (or something similar, not 100% decided). I had some questions around heat dissipation and how I can calculate ...
3
votes
1answer
361 views

With solid-state equipment, when would one use a dummy load?

With vacuum-tube-based transmitters, you'd need to tune the output finals to achieve maximum power output, and this was commonly done into some sort of dummy load (either a purpose-made dummy load or ...