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[aprssig] info for TM-D710E in car

K7FTP k7ftp at commtechreview.net
Wed Jan 23 14:42:16 UTC 2008


There are several companies marketing fairly large capacitors for the car 
stereo/amplifier market that are designed to support the devices during 
periods of extra-heavy demand.  Something like that might help, or an extra 
battery as has been discussed here.

We use a second battery in our Emergency Communications Project Jeep.  We 
recently switched to Optima yellow-top from Odyssey after having some issues 
with the Odyssey PC925MJT batteries.  The top terminal didn't hold up well.

We use a Wrangler NW battery management system that can isolate the two 
batteries, or tie them together for really power-intensive operation.  In 
this situation, only one battery is used for cranking the engine, the other 
powers the radio gear and all of the extra lighting we have installed.  We 
can tie them together if using the winch.  We never note power hits when 
cranking, although I have seen this before in other vehicles.  I know that 
the TM-D700A seemed to react OK.

www.commtechreview.net/jeep if you are interested.






----- Original Message ----- 
From: "Steve Slay" <snslay at swbell.net>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Wednesday, January 23, 2008 6:27 AM
Subject: Re: [aprssig] info for TM-D710E in car


> Is this the one?
>
> http://www.powerstream.com/DC-UPS-1212-10A.htm
>
> Steve Slay
> KC5MVY
>
> ----- Original Message ----- 
> From: "Dave Baxter" <dave at emv.co.uk>
> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
> Sent: Wednesday, January 23, 2008 3:24 AM
> Subject: RE: [aprssig] info for TM-D710E in car
>
>
> The following device IS the solution to the problem stated by IK1AQI and
> IZ1CQY :
>            http://www.aprsworld.com/apo3/
>
> Nope, that is NOT the solution to the radio loosing it's settings and
> not updating it's postion data from the GPS, after a power dip during
> engine cranking.
>
> That device will however as it says prevent the main battery from being
> emptied if an accessory (that is powered via it) is left on while the
> engine is not running.   That is not the issue here.  That is that the
> D710 locks up when the "12V" input drops below 11.45V.
>
> They are asking if this has been seen by others, and if there are plans
> for an updated (or modified) D710 that does not suffer in that way...
> I suspect there are cascaded regulators used, 12V>8V then 8V>5V etc, so
> when the first drops out, they all do.
>
> IK1AQI and IZ1CQY also state they had found a temporary solution, by the
> sound of it a 12V UPS of sorts (an extra battery in paralel with the
> radio!)
>
> But you have to wonder about the mentality of a maker who produces a
> piece of kit that if not specificaly designed for vehicle use, will be
> used by many in vehicles, that does not tolerate, or behave sensibly
> when the power momentarily dip's below a certain value.  There again,
> that's nothing new, is it.
>
> If you use a D710 (or anthing else that will be "P'd" off if the 12V
> blips)  Best engineer some sort of 13.8V UPS.  Power Stream
> (http://www.powerstream.com/) used to do such a module, but looking at
> their website now, it's not listed any more.  But if cost is not an
> issue, they do lots of stuff that you could use do make such a thing. A
> High Power DC-DC converter, float charging a second battery for example.
> The DC-DC converter/charger would only be enabled when the engine was
> running and the generator working.
>
> Or much cheaper, just use a "Split Charge" system with two batteries,
> and use the second battery for the APRS kit.
>
> Or one of Power Stream's regulating BuckBoost converters to keep a clean
> DC voltage from the rather variable vehicle supply.   But that might
> have spurious and QRM issues of course.
>
> Cheers All.
>
> Dave G0WBX.
>
> ________________________________
>
> From: Terry Palmer [mailto:terrypalmer2 at compuserve.com]
> Sent: Tuesday, January 22, 2008 10:21 AM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] info for TM-D710E in car
>
>
> The following device IS the solution to the problem stated by
> IK1AQI and IZ1CQY :
>
>            http://www.aprsworld.com/apo3/
>
> I use this on a car with 12 volt accessories powered up 24/7 and
> on a car with the ignition that powers up, then off, then on that above
> authors mentioned.
>
> I leave the D700 turned on 24/7 and never have to use the
> hardware power-on button; the d700 automatically turns on when the dc
> voltage hits 14.1 and in the case of the car (Audi) that has accessories
> hot 24/7, I have the APO3 set to turn off D700 after 10 minutes.
>
> You will love this device.
>
> P.S. I do not work for the company; just a satisfied customer.
>
> Terry K1LCH
>
> This mail has been scanned by Palmer Cook Computer Services Limited. 
> www.palmercook.co.uk
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