Hi all,
 
A diode was my first try, but there are several problems with that  approach.
 
The first being the additional volt drop can make battery charging more of  a 
problem with a fixed supply, though a schottky diode would help to some 
degree  on that score. The biggest problem was the generation of heat was 
greater 
than  would have comfortable with and there was not enough room within the PSU 
case to  add the additional heat sinking required for the diode. However, the 
DC current  requirements were rather higher for the repeater application than 
would be  required to drive a basic K2.
 
Yes, a diode could certainly be used with care.
 
Bob, G3VVT
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