[aprssig] Re: Placer 450 GPS
Al Wolfe
awolfe at Route24.net
Wed Jul 27 00:33:08 EDT 2005
As someone mentioned the Placer 450 GPS was an early Trimble 8 channel
unit. They came in several configurations. They may have 1, 2, or 3 DE-9
connectors on them. Looking at the back of the unit, the left most DE-9 is
the RS232 I/O data port. The other connectors supported an MDT or other
options or RTCM.
They want 10 to 32 VDC, nominal 250 ma. The lithium battery is good for
5 years. There is usually +5 vdc on the antenna jack for an amplified
antenna. Seems like there may be couple of pads on the bottom of the PC
board to get you the 5 volts if it isn't there.
The info on Trimble's web site is probably enough to get one working. I
never got around to using one for APRS, but did determine that they worked
and could put out NMEA data. They should work OK for APRS. Look for a file
"450-455.pdf" on the Trimble web site for info. Also, I found a file there
called "pla450CDPD-Firmware250.exe" that I think is the software to
configure a 450.
It's been a couple of years since I played around with a Placer 450 so
hope this info is correct.
Good luck,
Al, K9SI
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