Hi Jim,
It's not just hybrid & electric vehicles. Some newer conventional cars
shut the engine off during idle to save fuel. There's a sensor inline
with the battery neg terminal to measure charge & discharge rates to
prevent the start-stop algorithm from causing a dead battery. If you
connect direct to the battery, you will confuse the sensor.
73,
Josh W6XU
On 9/12/2016 2:52 PM, Jim Brown wrote:
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.
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