[aprssig] Mobile Off-Air Display

Charles Bland root at blandranch.net
Wed Aug 12 12:55:43 CDT 2015


Here are some shots of the Go box with the battery and resistor.

Looks like we got a little off topic....

http://www.blandranch.net/Files/GO1.jpg
http://www.blandranch.net/Files/GO2.jpg
http://www.blandranch.net/Files/GO3.jpg
http://www.blandranch.net/Files/GO4.jpg


On Wed, Aug 12, 2015 at 8:04 AM, Andrew P. via aprssig <aprssig at tapr.org>
wrote:

> Actually, this is a very good idea for more than one reason. For one
> particular bicycle event my ARES group works around here, the vehicles that
> are loaned for SAG are the first ones I've seen where the cigarette lighter
> sockets turn off when the ignition goes off. Good for not destroying your
> car battery when you leave stuff plugged in, but horrible for keeping a
> tracker going while you are stopped at one of the rest stops
> loading/unloading the vehicle with supplies and/or exhausted riders. Net
> Control kept calling us on on cell phones wondering why we kept dropping
> off the map until we figured out what was going on.
>
> ------------------------------
> Date: Tue, 11 Aug 2015 21:52:11 -0700
> To: na5dw at cox.net
> CC: aprssig at tapr.org
> Subject: Re: [aprssig] Mobile Off-Air Display
> From: aprssig at tapr.org
>
>
> Dan,
>
> The attached photo is a simple schematic. 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.
>
> We run about 15-20W TX power. We have not had power issues for all-day
> events, plus the battery allows the op to continue working if he needs to
> temporarily disconnect from the car (or if the car turns off the power
> socket when they are one break.
>
> If you have any questions, please feel free to msg me direct at na6br at
> blandranch.net. Happy to help.
>
> Chuck
>
> On Tue, Aug 11, 2015 at 9:28 PM, Dan Walls <na5dw at cox.net> wrote:
>
> Can you give me some more info about how you provide power for your sag
> radio's.  I am helping the the tour de cure in Colorado this weekend and I
> will be using car provided for me.  The power issue is a concern to me.  I
> thought about powering the mobile from a 7 amp h  battery.  I am concerned
> about how long the battery will last.
>
> dan
> Na5dw
>
> On Sun, Aug 9, 2015 at 6:25 PM, Charles Bland via aprssig <
> aprssig at tapr.org> wrote:
>
> I'd like to get the latest opinion from this group about putting together
> a simple mobile APRS display solution.
>
> Our local club does a couple of bike events each year. We have an ad-hoc
> network to support our trackers over the course area. I have been turning
> my attention toward broader use of the info. For example, our rest stops
> now have displays, and we run a Public Info table so that we can make event
> participants aware of what we do and how we do it.
>
> I am now turning my attention to our radio operators in the sag wagons.
> For insurance purposes, the bike club provides the cars and drivers. The
> radio op rides shotgun, using a Go-Box that has battery assist so that the
> cigarette lighter adapter isn't doing the heavy TX lifting and can be
> shared for other uses.
>
> I'd like to have simple, non-transmitting display setup so that the
> operator can "look" around the course as he has need. I'm not sure where to
> start looking for commercial solutions, if there are any at all. I also
> have been wondering, given the abundance of R-PI hardware, if a R-PI and
> display would be enough to run something like YACC. A simple RX and antenna
> would be enough, and the package could be small enough to occupy little of
> the precious space in the vehicle and not pose a safety issue. Even nicer
> if it could be on the dash.
>
> So, what do you folks know? How would you approach such a requirement?
>
> Chuck
> NA6BR
>
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>
> --
> Dan Walls
> NA5DW
> Cell 405-414-9326
> Fax (888) 863-8601
>
>
>
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