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800Hz panel meter question

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Author Topic: 800Hz panel meter question  (Read 232 times)
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Patrick J. / KD5OEI
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« on: July 21, 2020, 01:14:11 PM »

I have a nice pair of panel meters, 0-150VAC 800Hz. They do indicate correctly on 60Hz, but there is too much current or something. The needle almost 'sticks;' when energized but is free when un-energized, that is, tilting the meter right-left-right it swings normally. It's not ruined, but I'm trying to figure out how to use it even if I have to modify something like the rectifier or multiplier etc. As far as I can tell it's a moving coil movement, not a vane. I have assumed it's aDC movement, but have not opened them.I thought I knew alot about panel meters, but apparently not. I would like to use them to show both sides of the 240V line voltage.

Radio Candelstein - Flagship Station of the NRK Radio Network.

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« Reply #1 on: July 22, 2020, 11:06:00 AM »

Maybe meters from a TBW or GP series WW2 transmitter. They used 800 Hz power supplies because they required smaller transformers and filters in the power supplies and they also used the raw 800 Hz to feed the suppressor of the 803 PA tube to develop A2 or AM CW.
The TBW had a gasoline powered 800 Hz generator and cannot imagine what that sounded like in operation. I had a TBW that I built up a regular AC power supply that I use to run and somehow think it had a meter that had two scales one for input voltage and a second scale for 0 to 15 volts that was used for setting the filament voltage of the PA tube, may a want to check because your 150 volt meter may just be a 15 volt meter?

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