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[aprssig] 12V wiring ideas

KBØNLY kb0nly at mchsi.com
Sun Oct 30 00:27:27 UTC 2011


That’s what I was just going to say, couldn't have happened as described 
with a negative ground.

Scott



-----Original Message----- 
From: DALE
Sent: Saturday, October 29, 2011 7:13 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] 12V wiring ideas

in that case there was a piece of pos gnd equipment installed.
dale

----- Original Message -----
From: "WE7U Curt" <curt.we7u at gmail.com>
To: "WE7U Curt" <Curt.WE7U at gmail.com>
Cc: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Saturday, October 29, 2011 4:47:17 PM
Subject: Re: [aprssig] 12V wiring ideas

On Sat, 29 Oct 2011, Curt, WE7U wrote:

> On Sat, 29 Oct 2011, Bob Bruninga  wrote:
>
>>> I have seen PP's come apart many times with
>>> no tension on the wires.  So I know its possible.
>>
>> Sure if the PP is not assembled right in the first place.  Anything not
>> properly installed cannot be expected to work right.
>>
>> If the PP contact is properly slid all the way in to where it hooks over
>> the steel spring clip, then (and only then) will it be in the correct
>> position and will properly do its job.  Sometimes people do not do that
>> last little click and forget to look carefully to assure it is seated.
>>
>> I use them all the time, and they never come apart.
>
> Those that solder them (I used to) can also get rosin on the contact 
> surface
> and/or get solder up onto the contact surface.  You can also end up not
> having them seat properly or seat at an angle after soldering.
>
> Now that I use the cheap crimp tool (recommended on some web sites as 
> doing
> correct crimps) I've not had any trouble with them.
>
> The military uses crimps instead of soldering to get more reliable
> connections.  If it's good enough for them, it's probably good enough for 
> my
> Jeep.
>
> BTW:  Forgetting to fuse the ground lead at the battery is a _very_ poor
> idea.  Years ago I did my own radio installs that way.  You can burn up 
> the
> ground wire, or burn the insulation off it if the car has a bad return for
> the starter motor.  I had that happen twice during high school.  The first
> time the wire heated up during starting and burned all the insulation off,
> then the wire burned in two.  The 2nd time (different car) the wire melted
> its way into another wire bundle causing a lot of $$ in damage that had to 
> be
> repaired.  Didn't start a car fire in either case but easily could have.
> Each time it happened was while starting the car.

I should have mentioned:  Each of these were each radio installations with a 
very short ground wire going directly to a tie point on the metal dashboard. 
The only fuse was in the hot lead, going to the fuse block inside the 
passenger compartment under the dash.

-- 
Curt, WE7U.        http://www.eskimo.com/~archer
U.S. Weather Alerts:  Firenet.us, port 14580, filter "t/n e/WE7U-WX"

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