STM SatLink VSAT - Page 67

SatLink VSAT User Guide
Publication no. 101557
Rev 14.1.1-2
Copyright 2006-2012 – STM Group, Inc.
Page 66 (182)
8. Have contact by phone with the control center when performing the following measurements.
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 center 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 VSAT immediately.
Example:
# dvb tx calibrate
Using preconfigured CW frequency 14.488000 GHz
RF Wanted= 34.5, RF Measured= 20.8, If output= -29.2
RF Wanted= 34.5, RF Measured= 22.2, If output= -28.2
RF Wanted= 34.5, RF Measured= 24.8, If output= -26.2
RF Wanted= 34.5, RF Measured= 25.6, If output= -25.2
RF Wanted= 34.5, RF Measured= 27.9, If output= -23.2
RF Wanted= 34.5, RF Measured= 30.1, If output= -21.2
RF Wanted= 34.5, RF Measured= 31.1, If output= -20.7
RF Wanted= 34.5, RF Measured= 32.8, If output= -19.2
RF Wanted= 34.5, RF Measured= 33.2, If output= -19.2
RF Wanted= 34.5, RF Measured= 33.7, If output= -18.7
ODU output level stabilized
Note: CW transmission is still enabled to allow
for cross polarization adjustment of the antenna
Saving Configuration. This will take ~20 secs
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
IDU output power : -15 dBm
IDU max output power: 0.0 dBm
EIRP : max
Default CW Frequency: 14.488000 GHz
ATM mode : VC-Mux
Header Compression : RTP/UDP/IP/DSM-CC
Satellite (DVB) Transmitter Status
--------------------------------
State : On (TDMA)
IDU Output Power : -23.1 dBm
ODU Output Power : 34.9 dBm
EIRP : 46.1 dBW
Es/No : 9.5 dB