Copyright © 2006 – STM Norway AS
Publication no. 101557, Rev. T, November 3
th
, 2006
Page 35
9.
Issue the CLI command
dvb tx calibrate
to start the automatic transmitter power calibration
routine. During this calibration, the transmit EIRP level is detected and the IDU output level is
automatically adjusted to the level required for transmitting with the configured EIRP level. Hence no
manual configuration of the IDU output power level or cable attenuation is required.
Ask the control centre if they can detect the transmitted CW. If they are not able to
see the CW at the specified frequency and expected output power level, please power
off the STM SatLink Terminal immediately.
Example:
# dvb tx calibrate
Using preconfigured CW frequency 14.488000 GHz
RF Wanted= 30.7, RF Measured= 0.0, If output= -30.1
RF Wanted= 30.7, RF Measured= 30.6, If output= -26.6
ODU output level stabilised
Saving configuration
Note: CW transmission is still enabled to allow
for crosspolarisation adjustment of the antenna
Configuration Saved
10.
Verify the calibrated power levels using the CLI command
dvb tx show
.
Example:
dvb tx show
Satellite (DVB) TX Configuration
--------------------------------
Auto start : Enabled
Population ID : 2
IDU output power : -11 dBm
EIRP : max
Default CW Frequency: 14.488000 GHz
AAL5 Encapsulation : VC MUX
DVB Transmitter Status
----------------------
State : On
IDU Output Power : -13.6 dBm
ODU Output Power : 33.2 dBm
EIRP : 46.5 dBW
delta T : 263366 microseconds
Frequency Correction : -2650 Hz
#
Leave the CW on for fine adjustment of the antenna, or turn it off using the CLI command
dvb tx cw off
.
6.3.3 Fine adjustment of antenna pointing
If the CW from the power calibration routine is still on, it can be used for the antenna fine-adjustment as
well. Otherwise start CW transmission on the default CW frequency by issuing the CLI command
dvb
tx cw on.