[aprssig] Mobile Off-Air Display

Charles Bland root at blandranch.net
Wed Aug 12 15:12:37 CDT 2015


One other thing worth pointing out, as the battery voltage approaches the
voltage on the other side of the resistor, current flow to the battery
slows too. I doubt overcharging is an issue.

On Wed, Aug 12, 2015 at 11:15 AM, Andrew P. via aprssig <aprssig at tapr.org>
wrote:

> I have a liitle sturdier setup. I xhopped the socket off a 12v cigarette
> lighter extension cord. It's only 16-gauge wire, so it effectively acts as
> a resustor for high draws. I do also use a West Mountain Radio battery
> isolator, which is nice because it protects both the starting and auxiliary
> batteries from over-discharge.
>
> Andrew, KA2DDO
> author of YAAC  ("Yet Another APRS Client")
> http://www.ka2ddo.org/ka2ddo/YAAC.html
> member, Chester County (PA) ARES/RACES
>
>
> -------- Original message --------
> From: Bill Vodall via aprssig <aprssig at tapr.org>
> Date: 08/12/2015 2:02 PM (GMT-05:00)
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Subject: Re: [aprssig] Mobile Off-Air Display
>
> >. Basically, we connect to car power
> > through a one ohm resistor. It basically makes high current draws come
> from
> > the battery instead of the car, but allowing the car power to keep the
> battery topped.
>
> I'm done something similar but using a 12V bulb instead of a resister.
> It limits the current flow to a fixed amount and provides a visual
> indicator of charging.   I believe it requires a supplemental smart
> charging circuit to properly top off and cycle the battery to maintain
> good battery health.
>
> Bill
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