SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 141 (160)
Appendix I. IDU Power Calibration with BUCs Other Than
SatLink 403x
STM SatLink VSAT can be used together with various 3
rd
party BUCs for C-, Ku-, Ka-, and EHF-band.
BUCs. These BUCs do not support DiSEqC communication and do not have a power detector to measure
the actual output power from the HPA. A more complicated procedure to calibrate the TX output power
must then be run as described below.
I.1 Calibrating the IDU Output Power
This section describes how to calibrate the TX output power when using 3
rd
party BUCs without support
for DiSEqC and integrated power detector. Please refer to section 6.3.2 for the description of the
calibration procedure for the STM SatLink 403x.
Ensure that the STM SatLink VSAT configuration procedure in section 6.2 has been performed.
Ensure that the STM SatLink VSAT is configured to start the receiver (RX) automatically, but not the
transmitter (TX).
Enter the CLI command
dvb rx autostart on to enable receiver automatic start.
Enter the CLI command
dvb tx autostart off to disable transmitter automatic start.
Enter the CLI command
dvb rx show. Verify that the parameter Auto start is set to Enabled.
Enter the CLI command
dvb tx show. Verify that the transmitter is Off and the parameter Auto
start
is set to Disabled. If the transmitter is On, use the command dvb tx logoff.
Enter the CLI command
save config to save this configuration.
Ensure that the TX and RX cables from the STM SatLink VSAT to the ODU are connected.
Restart the SatLink VSAT (issue the CLI command
restart), wait till the application has loaded and the
STM SatLink VSAT has locked to the received carrier. The receiver has successfully acquired the
forward link when the message
Forward link up is displayed (see section 9.3.1 for further details).
Logon as the install user (user = install, factory default password = dvbrcs)
Call the control centre and have contact by phone for the following measurements.
Set up a continuous wave (CW) with the following command:
dvb tx cw on <pow> <freq>
where
pow = Transmitted IF power level from IDU in dBm.
This is an integer in the range –30 to 0. (Start with pow= -30)
freq
= transmitted radio frequency in kHz. The frequency is only required the first time
the CW is turned on. Subsequent adjustment of the power level can be done
without entering the frequency.
Example:
dvb tx cw on -30 14100000
will transmit a CW from the ODU output at 14.1 GHz with an IDU output power of –30 dBm from the
STM SatLink VSAT.
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