4RF Aprisa SR+ - Page 138

138 | Managing the Radio
Aprisa SR+ User Manual 1.11.1
Modulation Type
This parameter sets the TX Modulation Type for the radio.
Option
Function
Adaptive
Sets the transmit modulation to Adaptive Coding Modulation (ACM).
QPSK (High Gain)
Sets the modulation to QPSK with Max Coded FEC.
QPSK (Low Gain)
Sets the modulation to QPSK with Min Coded FEC.
QPSK
Sets the modulation to QPSK with no FEC.
16QAM (High Gain)
Sets the modulation to 16 QAM with Max Coded FEC.
16QAM (Low Gain)
Sets the modulation to 16 QAM with Min Coded FEC.
16QAM
Sets the modulation to 16 QAM with no FEC.
64QAM (High Gain)
Sets the modulation to 64 QAM with Max Coded FEC.
64QAM (Low Gain)
Sets the modulation to 64 QAM with Min Coded FEC.
64QAM
Sets the modulation to 64 QAM with no FEC.
The default setting is Adaptive.
When the Modulation Type is set to Adaptive, the transmitted modulation and coding will be determined by
the signal quality of the link to the destination radio. Link quality for each radio is determined both
concurrently and independently.
The link quality used for each packet depends on the destination;
• Remote to base, remote to repeater and repeater to base uses the quality of that link only
• Unicast base to remote and base to repeater packets use the quality of that link only
• Unicast repeater to remote packets use the lowest of either the repeater-remote link or the
repeater-base link
• Broadcast base to remote, base to repeater and repeater to remote packets (serial or broadcast IP
or multicast IP) use the slowest link quality of all destinations
Adaptive Modulation is available in all Terminal Operating Modes and all Channel Access Schemes except
Listen Before Send.