Over the years I too have managed to blow the front end of some commercial two way radios. Being
in the repair field, I chose to take an active stand and try to prevent this from happening again. my
solution was to add a pair of hot carrier diodes back to back across the front end of the receivers.
If there was no series resistor coming off the first tuning coil to the active front end, I would add a
small value resistor to provide a means to drop a voltage when the diodes did conduct. After the
mod, I never had a blown front end again.
One of my biggest sources of RF was from a high powered UHF radar at the facility I once worked
at. It only ran about a megawatt of output power. The road ran about 30 feet away from the big dish
antenna that it used. it cleaned out the front end of my VHF radio twice before I figured out the
cause and modified the receiver.
Now tell me your little 75 watts couldn't be the cause.
Jim
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Jim
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