[time-nuts] Trimble Resolution-T versus Resolution SMT
Mark Sims
holrum at hotmail.com
Fri May 25 21:02:18 UTC 2012
I got in a couple of Resolution-T receivers from fluke.l and have had a chance to compare them with the Resolution SMT:
The -SMT receivers appear to be new. Mine were the TEP variant (Motorola compatible) that has to be reconfigured to be TSIP compatible. The -T receivers are used. Mine came with locations in rural China stored in their survey position. The -T serial port comes set for 9600,8,Odd,1 (Tbolts are 9600,8,N,1)
The receivers are physically and electrically compatible. They are mostly software compatible. The -SMT only works at fixed locations. The -T can work in mobile applications or as a general purpose GPS receiver.
The -T is a 12 channel receiver and the -SMT is 14 channel. The -SMT is 6-8 dB more sensitive. The -SMT tracks and reports info on all sats that it sees (even if below the elevation and signal level masks). The -T only tracks and reports info on the sats above the masks.
The -T has a +/-20 ns PPS, the -SMT has a +/- 14 ns PPS. Both support external sawtooth correction.
The -T responds to the dynamics filter (0x70) message. You can enable the PV, Static, Altitude, and Kalman filters (Kalman overrides the others).
The -SMT serial port occasionally glitches messages.
The -T receiver shuts down for a couple of seconds when writing parameters into its EEPROM.
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