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
[Image: http://i1367.photobucket.com/albums/r796...vcogj0.jpg]
[Image: http://i1367.photobucket.com/albums/r796...htltlj.jpg]
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
[Image: http://i1367.photobucket.com/albums/r796...vcogj0.jpg]
[Image: http://i1367.photobucket.com/albums/r796...htltlj.jpg]
