[Elecraft] Mobile from 117 VAC

[Bob McGraw K4TAX]

For a 100 watt PEP HF radio or like VHF/UHF radio, the correct solution 
is a 3 wire system.  Positive - connected and fused at the battery and 
radio ends, Negative - connected and fused at the battery and radio 
ends, AND a 3rd wire connected to the firewall/frame {not battery 
negative} of the vehicle and connected to the ground terminal on the 
radio.  Usually there is a rubber boot or grommet in the firewall just 
to the left or right where the steering column passes through the 
firewall.  It is easy to push the needed wiring through this grommet.  
Thus installation complete and no holes drilled, and one has a proper 
and safe electrical source for the radio.

73

Bob, K4TAX