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[aprssig] power on DB9 connector standard for trackers?

Tad Burnett tburnett at vermontel.net
Wed Dec 1 02:13:37 UTC 2004


You could put a small resister in parallel with the regulater to carry 
part of the 140 ma...
Tad

Larry Cerney wrote:

>Jason,
>
>I tried to use the 78L05 on the open tracker which worked to power a Deluo
>GPS.  The max I rating for the '05 is 140 mA and running the GPS (140 mA)
>caused the 78L05 to get too hot for my liking.  So, what I did was to move a
>7805 off to the side just for powering the GPS.  I took the input power from
>the OpenTracker and connected the output of the 7805 to Pin 10 on the Jumper
>Header which goes to Pin 4 of the DB9 connector.
>
>Another option is to use the Garmin 18 with pigtails.  The Garmin 18 draws
>~65 mA and could be easily powered from the OpenTracker's 78L05.  
>
>I didn't go that route because after thinking about it I came to the
>conclusion that it didn't make any sense to pay $80 to keep a $0.25 part
>from burning up, duh....
>
>BTW, I put the OpenTracker into a little Radio Shack project box, 2"x3", and
>it fits great sideways with the DB9 connectors hanging out.  I drilled a
>hole to put the power in through a grommet for strain relieve. I drilled a
>little hole above the LED so I could see what the OT was doing.  Came out
>great.
>
>73..
>
>Larry
>
>
>
>
>"The only reason for time is so that everything doesn't happen at once." 
>--Albert Einstein 
>-----Original Message-----
>From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
>On Behalf Of Jason Winningham
>Sent: Tuesday, November 30, 2004 5:59 PM
>To: TAPR APRS Mailing List
>Subject: [aprssig] power on DB9 connector standard for trackers?
>
>Is there a standard for a tracker supplying power to a GPS via a DB9 
>pin?
>
>For example, the Opentracker has a jumper to pass Vin from pin 7 on the 
>radio side DB9 to pin 4 on the GPS DB9, but this appears to be 
>unregulated.
>
>I thought I remembered a reference to a regulated voltage on pin 9, but 
>I can't find it now.
>
>It's not a big deal, but while I'm building a tracker housing and GPS 
>cables, I figure I may as well adhere to a standard if there is one.
>
>-Jason
>kg4wsv
>
>
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>
>
>  
>
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