DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 131

Table 105: 5 Volt Gyros

Characteristic Min. Typical Max. Unit
Vgyro 0 5 V
Gyro rate 25 mV/(degree/s), +/- 10%
Zero Rate Output (Epson) 1.76 V
Zero Rate Output
(Panasonic)
2.5 V
Notes: Check with your local Trimble Sales for the latest version of the Lassen
DR+GPS firmware that supports your Gyro option.
GPS Antenna
The antenna receives the GPS satellite signals and passes them to the receiver.
The GPS signals are spread spectrum signals in the 1575MHz range and do not
penetrate conductive or opaque surfaces.
Therefore, the antenna must be located outdoors with a clear view of the sky.
The Lassen DR+GPS Module receiver requires an active antenna. The received
GPS signals are approximately -130 dBm, at the surface of the earth (in typical
environments). Trimble's active antennas include a preamplifier that filters and
amplifies the GPS signals before delivery to the receiver.
Trimble offers a range of suitable antennas for use with the Lassen DR+GPS
Module.
Keep in mind that the DR+GPS module needs an LNA to work properly. The gain
of the LNA should be approximately 18 dB as a minimum, and 35 dB maximum.