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[aprssig] APRS (Fire) In A Car

Fred Atkinson, WB4AEJ fred at wb4aej.com
Tue Jan 24 13:42:34 UTC 2006


    You know, the purpose of a fuse isn't to protect your equipment.  It is
for the purpose of preventing a fire.  Don't be betting on fuses for
equipment protection.  That's not what they are designed to do.

    Regards,


                                                                    Fred

----- Original Message -----
From: "Wes Johnston" <aprs at kd4rdb.com>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Tuesday, January 24, 2006 8:33 AM
Subject: Re: [aprssig] APRS (Fire) In A Car


> I had a mobile radio loose it's ground and when the TNC keyed up the
> radio, the radio sought a ground back thru the TNC burning a ground
> trace in the TNC PCB.... err is that a fuseable link?? lol!  This
> suddely made me realize why it was suggested that we fuse BOTH leads.
> I've also heard of the same thing happening to radios when the engine
> block looses it's ground strap and you try to start your car.  Bob makes
> a good point about the wire being big enough to carry enough current to
> pop your fuse.
>
> If you want to protect your radio from car starting, put a 20A fuse in
> the neg lead of the radio.  Of course another solution is to run the
> negative lead of the radio to the - battery terminal and don't ground
> your rig to the car chassis.
>
> If you want to protext your TNCs and GPSs from radios loosing ground,
> put a 1A fuse in their negative leads.
>
> Wes
>
> Robert Bruninga wrote:
> >>OK I get the small wire point but, what's the best solution?
> >>Two separate fuses?
> >
> >
> > Either two separate fuses, a smaller one appropriate
> > for the smaller wire, or the one fuse (or pair of fuses)
> > to the radio, but then big enough wire to the GPS
> > so that any short -will- blow the 20 amp fuse and
> > not burn the wire instead.  de Wb4APR
> >
> >
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> >
> >
> >
>
>
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