GROUND RADIO BULLETIN NO. 19 - DECEMBER 15, 1949 COMMS. DEPT. L.A.D.
STICKING METER POINTERS
Most stations have, at one time or another, been troubled with transmitter meters sticking* The usual temporary remedy has been to tap the meter gently to free the pointer.
This trouble can be caused by several things. The most common is that the momentum of the pointer returning to zero overcarries and jams in the region below zero. This can be easily corrected by installing meter pointer stops. The stop should be so positioned that the pointer can return to 1/16” below zero so that the zero set screw on the- meter can still be used in making small adjustments to the meter when necessary.
These stops consist of a small piece of stiff wire with a loop at one end to fit under one of the screws holding the meter dial plate, and a right angle bend at the free end fitted with a bumper. When the pointer returns to zero, it encounters the stop and does not overcarry sufficiently to cause sticking.
When installing these stops, remember that meters are delicate and should be handled very carefully in opening. This should be done in clean surroundings and with proper small tools. The pointer should not be handled more than necessary.
Meter stops may be requisitioned under PAA #408D-74922.
Other troubles which cause meters to stick are: faulty bearings, armature bobbin rubbing against pole pieces, damaged spring, etc. These cannot be remedied by the stops, and replacement meters should be requisitioned* The faulty meter is returned to Miami where it is repaired in the instrument shop and placed in stock.
INSTRUCTION MANUALS
It has been brought to our attention that some Equipment Instruction Manuals at line stations are so badly worn it is difficult to read schematic diagrams, etc; also, that in some instances manuals have been lost or misplaced. If this is applicable to any Instruction Manuals at your station, kindly advise replacement copies needed.
FORM 9211—2107
