[aprssig] Mobile Off-Air Display

Charles Bland root at blandranch.net
Wed Aug 12 00:52:11 EDT 2015


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.


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
>> _______________________________________________
>> aprssig mailing list
>> aprssig at tapr.org
>> http://www.tapr.org/mailman/listinfo/aprssig
> --
> Dan Walls
> Cell 405-414-9326
> Fax (888) 863-8601
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