If you run the radio negative lead directly to the battery, you need to
fuse that lead by the battery. Should the main battery ground wire open,
and one tries to start the car, the starter will try to pull all the
current it needs through the radio NEG wire. It could also pull current
through the antenna lead if the radio is not grounded. At the very least,
there will be a mess of melted insulation. Worst case would be a fire. If
one grounds the radio NEG to vehicle body, that fuse is not needed in the
NEG lead. No judgement as to which way is better. --Mike, WV2ZOW.
On Wed, Jun 12, 2019 at 2:42 PM Cecil <firstname.lastname@example.org> wrote:
> Running the negative lead directly to the battery increases the risk of
> noise related to ground loops. Think of the vehicle chassis as a
> ground/return buss. Also take que’s from the auto manufacturer who has more
> electronics in today’s cars than you will put in them...they don’t run
> ground returns for every computer system, audio system etc back to the
> battery directly for the same reason.
> The manufacturer of the radio sells that product globally...it will go in
> boats, airplanes tractors you name it...not to mention your shack where you
> need both leads to be the same length to reach the power supply terminals.
> So the power leads being the same length is to accommodate all
> possibilities that an installation may face...not as evidence that they are
> both to go to the battery in a car...
> As for the two fuses...who knows. Maybe a negative ground system where the
> chassis of the radio is isolated, the positive lead is tied to the chassis
> and the negative goes to the battery.
> Sent from my iPad
> > On Jun 12, 2019, at 9:51 AM, Randy Berry <email@example.com> wrote:
> > OK, not exactly a Yaesu question, but a question about most mobile
> > radios including Yaesu sold today.
> > I had a disagreement with someone about the need to hook both negative
> > and positive directly to the cars battery as opposed to cutting the
> > ground wire from the provided power cord and grounding it to the cars
> > chassis near the radio.
> > My argument is that the battery will filter off some of the noise
> > generated by the alternator if both are hooked directly, he said that
> > is not the case and insisted a chassis ground near the radio is best.
> > If this is true why do practically every automobile electronics
> > manufacturer provide a cable with both Neg. and Pos. leads, and
> > recommend direct connect?
> > In my experience I have had better luck connecting 2 way radios, car
> > stereos and amplifiers directly to the battery.
> > The argument of having 2 fuses, one on the Neg, and one on the Pos,
> > was also brought up. I have a lot of equipment that came with fuses on
> > both leads. My Icom's, kenwood's and Yeasu's all have dual fuses.
> > Again, the engineers who designed the radio know a hell of a lot more
> > than me and some bloke on social media do. And there must be a reason
> > for the recommendation of going direct, and the 2 fuses must be there
> > for a purpose.
> > I recommended using both fuses as provided, and direct to the battery.
> > I was told I was wrong.
> > Who is right?
> > --
> > tnx es 73 de Randy, N3LRX/8
> > https://n3lrx.com
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