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Technical Tips from Mark W. Persons
 Replacement RF Amplifier for a Continental 802A FM Exciter


If you have a Continental 802A FM Exciter that has a failed Motorola MRF315A Transistor in the RF output amplifier, you could have a real problem.  Those transistors, or any viable substitutes, are not available today. 

Continental will gladly sell you a new module with different technology for about $2000.

There is an alternative. 


You can replace the RF amplifier card with a Broadcast Concepts amplifier.  You see one with a green top in this photo. 

Replacing the original card with this amplifier while keeping the original heat sink and directional coupler will run less than $1000 in our shop. 

Yes, it will make a full 50 watts of RF power when completed.
September 28, 2016:  Here a modified power amplifier module with low pass filter, but using the original directional coupler for measuring forward and reflected power. 
This is similar to the Continental 802B repair/update that we did recently.
One difference is that the original 802A RF Amplifier module does not include an RF low-pass filter, but it is an external option. 

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

Questions?  Email Mark Persons:  teki@mwpersons.com       

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