What size fuse is a 35 watt radio supposed to use?

Nate The Surveyor

Well-Known Member
I had a 15 amp one, reversed the polarity, and blew a part inside the radio. (Perhaps a diode?).
What size fuse is recommended?
And, if it had this recommended size, would it have blowed the fuse, instead of the diode?

Thanks, Nate
 

John Rosco

Member
JAVAD GNSS
The HPT485BT radio-modem configured to use 35W Tx power needs 120W (IE: at 12Vdc = 10amps).

However the 'polarity' of the input supply voltage 'must be correct' otherwise a 'reverse input voltage' will damage the HPT485BT radio-modem unit for sure.
 

Jim Frame

Well-Known Member
However the 'polarity' of the input supply voltage 'must be correct' otherwise a 'reverse input voltage' will damage the HPT485BT radio-modem unit for sure.

That would seem to be a design oversight. Reverse polarity protection is relatively inexpensive, and reversing polarity isn't hard to do (just ask Nate!).
 
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