Myron, Good points.
For those who choose not to trust the conductivity of the vehicle chassis local ground point, run the negative wire to a point on the vehicle chassis near the point where the battery to chassis ground wire is mounted - but not to the battery terminal itself nor the battery to chassis cable mounting point. Create a new ground point near the battery to chassis wire and bite into the metal with an adequate star washer for a low resistance connection - no fuse in the negative wire.
This is the recommendation of W8JI Tom Rauch who has also installed many mobile radio systems (commercial and amateur). See http://www.w8ji.com/mobile_ground.htm as has been mentioned previously.
73, Don W3FPR On 9/12/2016 11:29 PM, thelastdb wrote:
I was once a 2-way radio tech and have installed over 1000 business band radios (yes, over one thousand) in my 15 or so years career. One thing we, the companies I've worked for, was NEVER to run a dedicated ground wire to the battery. We used a short ground wire from the radio and the local vehicle chassis. From the 100W Motrac/Mastr II/SyntorX (and many others) all used the chassis as a return path. Only once did I have a problem. Once a Low band unit (39MHz) with a magnetic mount (NMO-40) came back because the excess ground wire was coiled into a nice inductor. (I installed that one). Caused all sorts of RFI in the broadcast radio etc.
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