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Technical Tips from Mark W. Persons

Temporary Repair for a Collins/Continental FM Drive Belt

Almost anyone who has worked on a Collins or Continental FM transmitter, knows that there is a drive belt that connects the IPA Tuning shaft to a vacuum variable capacitor under the PA tube.  Here is a photo looking up into the IPA compartment of a Collins 831F-2 10 KW FM Transmitter.

The red drive belt on the left is not the original.  It is a TEMPORARY substitute, which was used until an original replacement could be procured.  

This photo shows the original worn-out belt on the top.  It failed because it dried out with age.  The exact replacement belt is the blue one on the lower right.  The lower left temporary belt is a rubber "O" ring from a 3" EIA transmission line connector.  These are commonly found at FM transmitter sites as spares and make an excellent TEMPORARY drive belt.


The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons   ham W0MH      

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