05-26-2018, 10:13 AM
I must be missing something. I can't get the shadow meter to deflect more than approx. 1/32 of an inch.
First of all, the meter seems O.K. The vane moves freely and recenters itself (it's an older style meter). I have tried 2 different 37 tubes, with no change. The voltage on the plate is correct, both 2 meg resistors are new,as is the #66 cap.
The vane is centered on a strong station. But when I go off-frequency, it moves, but just barely. And the padder, #61, has no effect at all. I'm not sure how much the voltage on the plate should vary, but it only changes about 2 vdc.
This is my first experience with a shadow meter, so I'm not that familiar with it, but it seems straight forward.
Anyone with any ideas?
Thanks,
Pat
First of all, the meter seems O.K. The vane moves freely and recenters itself (it's an older style meter). I have tried 2 different 37 tubes, with no change. The voltage on the plate is correct, both 2 meg resistors are new,as is the #66 cap.
The vane is centered on a strong station. But when I go off-frequency, it moves, but just barely. And the padder, #61, has no effect at all. I'm not sure how much the voltage on the plate should vary, but it only changes about 2 vdc.
This is my first experience with a shadow meter, so I'm not that familiar with it, but it seems straight forward.
Anyone with any ideas?
Thanks,
Pat