User Manual

Sonik G2BT Base Transmitter User Manual
March 14, 2002 40 7M487C4
The power reporting and control system take into account the number of carriers being
transmitted at any one time. The power setting and reporting value is the total station RF output
power, in watts. For example, if there are 4 carriers enabled, and the user sets the station power
to 400 watts, each carrier will be controlled to 100 watts. When the station is transmitting, it will
report 400 watts as being full power.
If the station is configured for 4 carriers, and the transmit data feed only tells the station to use
one of the carriers, the power output will be reported as 100 watts. If some or all of the
subcarriers dekey before the end of the frame, the power will be reported as if the carriers had
been transmitting for the entire frame. The power control algorithm takes into account the number
of carriers on the air at any instant, and normalizes that to the power output relative to the
maximum number of carriers that the station is configured to use. For example, if the station is
set up for 400W with 3 carriers enabled, each carrier will radiate 133W. The reported output
power when only 2 subchannels are active will be 267W.
1
1
1
2
2
2
.
.
.
4
4
4
P
P
P
O
O
O
W
W
W
E
E
E
R
R
R
C
C
C
U
U
U
T
T
T
B
B
B
A
A
A
C
C
C
K
K
K
A
A
A
N
N
N
D
D
D
S
S
S
H
H
H
U
U
U
T
T
T
D
D
D
O
O
O
W
W
W
N
N
N
Power cutback is carried out when an operational failure is detected by the configuration monitor
task. The system may cut back by 1dB or 3dB, or may de-key the transmitter. An alarm and error
log entry is generated for all cutback and de-key events.
The following events trigger cutbacks and de-keying of the transmitter: