[TowerTalk] Remote switching design choice

[Pete Smith]

Can someone explain to me why some remote antenna switch manufacturers use 
a scheme that supplies 12V to the relay box and switch the ground side of 
the relays to select antennas, while others supply a common connection and 
switch the 12V to the desired relay?  I can't see an advantage one way or 
the other, and it does have the effect of creating incompatibility among 
makers' hardware.

73, Pete N4ZR
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