[TenTec] Re: Mobile Grounding
Thu, 22 Apr 1999 18:34:54 -0500
You know, I can't help but wonder how often this has happened? I am a
relative newcomer to mobile radio, having only done it since the mid
1950's, and I have probably just been lucky. I wonder if it would still
happen with the radio turned off? I wonder if it would be able to feed
backwards through the Zener diode that most radios have to prevent
"reversed polarity hookups"? Oh well I guess we better do it huh? Then
we are sure.
73, I gotta go work on my mobile installation, Paul K9PEP
PS: Hey wait a minute, the fuse I am going to have to use is a 30 ampere
one, will that protect my small radio wires?
Don't want no war guys, but I am having problems understanding how the
fused ground wire is going to help save my radio, if it is also grounded at
the antenna end? Or am I supposed to fuse that also? Plus the mounting
bracket is screwed down and it will be grounded that way too.
At 06:08 PM 4/22/99 -0500, rohre wrote:
>Roy and the group,
>The reason for the negative lead fuse in the mobile hook up is to save your
>Consider if the starter ground return to the battery, (The negative battery
>cable), came loose, became frayed, and parted; then the starter current would
>run through the antenna ground to the car, up the coax braid, and then
>your radio's common cable, and back to the battery. Likely, internal
>wires of the radio would be the smallest gauge of all these and would melt.
>A good quality fuse and holder will not reduce the voltage enough to matter
>more than this safety precaution.
>All the Yaecomwoods come with double fused DC cables now for this reason
>the commercial radios for other uses.
>73, Stuart K5KVH
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