12
The
LAS-BET and LAS-RET
systems are not supplied with a relative humidity sensor. Instead a
default value is used (50%). Note that the uncertainties in
RH
have little effect on the sensible heat
flux and the evapotranspiration.
2.3 RF TELEMETRY LINK
Table 2: Operating specifications RF telemetry and antenna.
RF Modem
2.4 GHz (X24-019PKI-R)
Manufacturer MaxStream
(www.maxstream.net)
Operating
temperature
-40
o
C to +85
o
C
Frequency 2.4000-2.4835
GHz
(World wide license free)
Spread spectrum
type
Frequency hopping, Wide band
FM modulator
Interface RS-232/RS-485/RS-422
Voltage
Nominal 12 VDC
Power
~200 mA (mode dependant)
Serial data
throughout
19.2 kbps
RF baud rate
20 kbps
Transmit power
output
50 mW (17 dBm)
Receiver sensitivity -102 dBm
Antenna
Operating
temperature
-45
o
C to +70
o
C
Frequency
2.4000 – 2.4835 GHz
Type Vagi
(directional)
Gain 16
dBi
Impedance 50
Ohm
Range
∼
5 km
Kipp & Zonen reserves the right to make changes to the specifications without prior notice.
Summary of Contents for LAS
Page 1: ...Instruction Manual Large Aperture Scintillometer LAS...
Page 28: ...27 Figure 17 Operational weather station of LAS RET system...
Page 29: ...28...
Page 39: ...38...
Page 45: ...44...
Page 49: ...48...
Page 51: ...50 Figure 33 Configuration screen and default settings of supplied RF modems...
Page 55: ...54...
Page 69: ...68...
Page 71: ...70 APPENDIX 9 CONNECTION PLAN LAS BET LAS RET Figure 47 Connection plan LAS BET system...
Page 72: ...71...
Page 73: ...72 Figure 48 Connection plan weather station LAS RET system...
Page 74: ...73 Figure 49 Connection plan scintillometer LAS RET system...
