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1747RE: [tracker2] T2-135 lessons being learned

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  • 'Scott Miller'
    May 16, 2007
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      The noise is apparently a design flaw in the DR-135 - it gets crosstalk from the data input to the speaker, regardless of the volume setting.  You can stop it by installing a 3.5mm plug in the speaker jack to disable the internal speaker entirely.

      From: tracker2@yahoogroups.com [mailto:tracker2@yahoogroups.com] On Behalf Of Bruce W. Martin
      Sent: Wednesday, May 16, 2007 7:43 AM
      To: tracker2@yahoogroups.com
      Subject: Re: [tracker2] T2-135 lessons being learned


      I finally got around and put the radio back in the truck to test it out.


      It powers up and I know the GPS is working and getting lock but the
      tracker never transmits. It seems to be receiving.

      Also, I notice that when the GPS is connected to the front GPS port
      that there is a rhythmic noise coming from the speaker. If I disable
      data or unplug the GPS it goes away. A different GPS plugged into the
      DB9 on the back does not produce the noise.

      I am heading for Dayton tomorrow morning and will bring it along.


      On May 2, 2007, at 6:04 PM, Bruce W. Martin wrote:

      > When I start it up I get both the red and green LEDs alternately
      > flashing. If I start the config program and restart the radio/T2
      > the Green LED is constant on and the program says:
      > "Unsupported firmware version. Please upgrade configuration program.
      > (ver 255 build 65535 target AP64-H)"
      > I ran the downloaded the OT2.s19 firmware and ran the config
      > program again replacing the firmware and it came right up.
      > Mostly just reporting this so others can benefit from what I learned.
      > thanks for your assistance.
      > See you in Dayton.
      > Bruce, KQ4TV
      > On May 2, 2007, at 3:11 PM, scott@opentrac. org wrote:
      >> If you open it up, you should see the LEDs blink at power-up.
      >> They may be blinking constantly if the firmware is corrupted. As
      >> long as it's still blinking, the config program should be able to
      >> catch the bootloader and let you reload the firmware. You could
      >> probably do it without the config program, too, but you'd probably
      >> need to come up with a way to send the right byte sequence to
      >> start the XMODEM download mode.
      >> If it's not blinking at all, then it's possible the firmware got
      >> wiped out completely. As far as I can remember, I've only had
      >> that happen with overvoltage conditions, like 9 volts on the IRQ
      >> pin. If it is totally blank, then you'll need to send it back for
      >> reprogramming.
      >> I'll see if I can duplicate the problem myself. I might need to
      >> set up the low-voltage inhibit on the processor.
      >> Scott
      >> From: Bruce W. Martin [mailto:yahoo@...]
      >> To: OT2 [mailto:tracker2@yahoogroup s.com]
      >> Sent: Wed, 02 May 2007 12:52:15 -0700
      >> Subject: [tracker2] T2-135 lessons being learned
      >> So, I got my T2-135 and installed it. Easy.
      >> After a few hours of trying different serial cables and different
      >> computers realized I needed to put the DR-135 in data mode to talk to
      >> the T2.
      >> Great! I can make changes with my Mac using Zterm or use the
      >> latest OT
      >> configuration program on Windows. I need to find something other than
      >> minicom for Linux.
      >> Hooked up the GPS and an antenna and it tracked great.
      >> Wanted to see how long the tracker would last on low power with a
      >> 3 year
      >> old UPS 7AH battery. Not as long as I hoped. Set it up in the
      >> truck as I
      >> went to work. Left it running with smart beaconing at about 90
      >> minutes
      >> while moving slow. After work I found the radio power cycling. While
      >> under load the battery would drop below some voltage threshold and
      >> the
      >> radio would turn off. Immediately the voltage would go up some now
      >> that
      >> there was no load and the radio would turn on. This cycle went on for
      >> who knows how long. Probably a few hours.
      >> Now I can't communicate with the T2-135. Have I killed it? Is there a
      >> way I can get it back to default condition?
      >> Bruce, KQ4TV

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