[aprssig] 12V wiring ideas

[DALE]

It is combining neg gnd and pos ground equipment in the same installation.
some laptops were pos gnd, some neg.
The switching supplies should eliminate some problems.
If they touch each other or one gets grounded it gets stinky and smoky.
Some of my ham radios were were pos gnd on my motorcycle. Had to be careful with the connector plugs.
dale



----- Original Message -----
From: "KBØNLY" <kb0nly at mchsi.com>
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Saturday, October 29, 2011 5:27:27 PM
Subject: Re: [aprssig] 12V wiring ideas

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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