1-6
Prego Operator’s Manual
www.javad.com
I N T R O D U C T I O N
Principles of Operation
1
When used in the field, raw data measurements are recorded in internal
memory. Alternatively, raw data measurements can be logged directly to the
integrated controller, by-passing the receiver’s memory. Also, a raw data
stream can be sent from the receiver to a PC. Raw data measurements can
be outputted in different third-party and proprietary formats (binary JNS
messages, etc.) at rates up to 20 Hz.
JNS offers five different types of communication boards that can be
installed in the receiver:
• Pacific Crest PDL (UHF) modem (450-470 MHz); receiving only.
• Pacific Crest PDL (UHF) modem (430-450 MHz); receiving only.
JNS provides an optional PDL RF Transmitter (Pacific Crest
Corporation). Signal output power is
2 or 35 Watts. The maximum link rate is 19,200 bps. External power
supply 9–16 VDC. PDL Base quiescent/receive power consumption is
1.9 W. PDL Base in the low/high RF power setting consumes 13.8 W or
125 W during transmission (PDL Base power consumption measured at
12.5 VDC). The radio coverage of 2-Watt transmitter varies from 1.5
km up to 3.0 km. If there is a clear line of sight between the base and
rover, the coverage is increased up to 5–6 km.
Notice:
Some countries require licensing to use the radio spectrum.
National radio regulatory organizations control this licensing
process.
• Spread spectrum modem – 915 MHz (JNS). Spread-Spectrum is a radio
communication technique in which the phase of the transmitted signal is
intentianllay changed by 180 degree shifts. This results in a bandwidth
significantly greater than the signal would have if its phase were not
changed. This modem combines transmitter and receiver. The radio
coverage of a one-watt transmitter varies from 1.5 km up to 2.0 km.
• Spread spectrum modem – 2.4 GHz (JNS). This modem combines a
transmitter and receiver. The radio coverage of a one-watt transmitter
varies from 1.5 km up to 2.0 km.
• Dual-band, dual-user GSM (Europe & Asia: 900/1800 MHz; USA &
Canada: 900/1900 MHz)
This board uses digital mobile telephone system features to transmit and
receive data. The coverage area is limited by the abilities of GSM,
which are called roaming and routing, and the SIM card enabled for
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