User's Manual

Liberator-V1000 User Manual Rev 04v05
Page 44 of 85 FBN Doc #: FBN-0125_04v05
after making any changes to ensure that the change is applied to the radio. ATPC is disabled by default on
V1000 radios. ATPC is always disabled when in “Alignment Mode”. Note that in Firmware Release
02.01.03.012, the maximum Tx power in 8PSK mode is +2dBm. The usable range with this Firmware release
for 8PSK is from 30 metres up to 450 metres maximum.
The Modulation Mode can be used to change modulation mode between fixed QPSK (up to 700Mbps) and
8PSK (1Gbps) AMOD. When 8PSK mode is selected, a slow adaptive modulation (AMOD) algorithm will
automatically choose between QPSK and 8PSK according to the changing condition of the radio link. When
QPSK mode is selected, AMOD is turned off. The Link Availability of the Modulation Mode may be changed
using the drop-down menu to select either “High”, “Medium” or “Low” availability (default is “Medium”). This
Availability setting changes the AMOD threshold: if Link Availability is set to “Low” this means that the AMOD
threshold is set at a lower level so that the link will transition to 8PSK mode much more easily. If Link
Availability is set to “High”, then the link will be biased more to remaining in QPSK mode, and will only
transition to 8PSK mode with a much higher incoming signal level.
Note that, on units fitted with AES capable hardware, if a valid AES Licence Key is applied, and AES encryption
is activated, the modulation will be locked to QPSK mode only with a maximum throughput rate of 700Mbps.
In this case, the AMOD setting options will not be displayed.
If the capacity key is only 700Mbps or lower, then it is recommended to set the modulation mode to QPSK in
order to avoid unnecessary changes up to 8PSK mode which will not increase the usable data rate if the Air
Data Rate is 700Mbps or less.
Figure 48 - Home Page showing the Air Data Rate (in this case set to 1000 Mbps)