User's Manual

Radio Operation
Crescendo UHF Half-Duplex User Manual Page 24 of 78
5.3.2 Tx Power
The transmit power of the Crescendo can be configured to transmit at fixed levels into a 50 load:
0dBm (1 mW)
+20dBm (100 mW)
+27dBm (500 mW)
+30dBm (1W)
+36dBm (4W)
+37dBm (5W)
A maximum power setting can be configured by the distributor to limit the allowable power for a given
combination of radio and antenna.
5.3.3 RSSI Trip
The RSSI trip setting is the lowest RF signal level for which the radio modem will attempt to acquire data.
An RSSI trip can be thought of as a “receiver unsquelch”.
RSSI Trip is configurable between -120 dBm and -40 dBm.
5.3.4 Channel Selection
Crescendo has sixteen channels that can be configured. Each channel is comprised of an uplink / downlink
(or transmit / receive) frequency pair.
The channel frequencies can be set within the switching bandwidth of the radio. The supported channel
frequency rasters are determined by the type approval of the unit.
The active channel can be set by adjusting the current channel setting in software. In models with an I/O
module, if “I/O Selects Channel” is enabled then the channel may also be set via the I/O module as follows:
Channel
Pin 4
Pin 3
Pin 2
Pin 1
1
Gnd
Gnd
Gnd
Gnd
2
Gnd
Gnd
Gnd
N/C
3
Gnd
Gnd
N/C
Gnd
4
Gnd
Gnd
N/C
N/C
5
Gnd
N/C
Gnd
Gnd
6
Gnd
N/C
Gnd
N/C
7
Gnd
N/C
N/C
Gnd
8
Gnd
N/C
N/C
N/C
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