Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
800Hz panel meter question




 
The AM Forum
August 03, 2020, 10:56:07 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: 800Hz panel meter question  (Read 232 times)
0 Members and 1 Guest are viewing this topic.
Opcom
Patrick J. / KD5OEI
Contributing
Member
*
Offline Offline

Posts: 7595



WWW
« 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.
Logged

Radio Candelstein - Flagship Station of the NRK Radio Network.
KA3EKH
Member

Offline Offline

Posts: 549



WWW
« 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?

Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.043 seconds with 18 queries.