[Elecraft] KX3 vehicle mount

[Jim Brown]

Not necessarily. There is no good reason to bond the radio to the 
vehicle. It is, however, necessary to have good RF connection at the 
antenna between the coax shield and the body so that it can act as a 
counterpoise. That connection could be through a good RF capacitor. In 
this were done, I see no reason why powering the radio directly from the 
battery would be problematic, or would interfere with that system.

Also, it seems to me that the system you describe is only viable with 
electric or hybrid vehicles. There are other significantly greater 
issues with installation of a HF radio in these vehicles.

73, Jim K9YC

On Mon,9/12/2016 1:57 PM, Gmail wrote:
> Newer cars that have the auto stop feature ( engine turns off at stop lights) have a sensor between battery negative and car frame.  In these cars the radio has to be connected to frame ground not the battery negative post or the sensor will not work right correctly.