[aprssig] New OpenTracker variant available

Tourge, Ryan R. Ryan.Tourge at sheriff.co.warren.ny.us
Wed Aug 2 14:28:39 CDT 2006

Crap Sorry that went to the list I didn't change the email address

-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org] On Behalf Of scott at opentrac.org
Sent: Tuesday, August 01, 2006 11:15 PM
To: 'TAPR APRS Mailing List'
Subject: [aprssig] New OpenTracker variant available

The OT1m boards have been in beta for awhile, but the cases are finally
and I'm now selling assembled units.  Kits will follow next week
when I get the assembly documentation finished.


I designed this version of the board when I discovered that the small
of the regular one can really be a hindrance for some applications.
control, for example, has always been a bit of a pain.  The OT1 can
output a
signal to turn the radio on and off, but it needed an external circuit
actually control the power.  The OT1m has space for a 9 or 20 amp switch
plus holes on the board that'll accept up to 12 AWG leads.  It's meant
short duty cycles, but I've run a 60 watt mobile at high power for a
minute and it wasn't in danger of overheating.

It works great for solar powered weather stations - it'll connect to a
1-wire weather station with standard telephone cable, and with the radio
powered off draws under 10 mA.  I'll probably offer an LDO regulator
later, which shaves 3 or 4 mA from that.

Beware, the audio tops out at a much higher level than previous boards.
should drive just about any rig without modification, but for HTs
you'll want to turn down the audio level in software, and fine tune it
the pot, to keep from overdeviating.

Oh, the power supply will current limit at about 750 mA.  Shouldn't keep
from driving any sane GPS receiver, and it's already saved a couple of
units from accidental magic smoke release.  Also, the counter input is
present on the modular jack.  You can wire it to a pushbutton (or any
contact closure device) and count runners passing your location in a
marathon, repeater transmissions since last beacon, or whatever.

The 20 gauge steel enclosure should also be more resistant to the
getting-run-over-by-a-car failure mode that a couple of OpenTrackers
experienced.  ;]

Scott, N1VG

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