Copyright © 2006 – STM Norway AS
Publication no. 101557, Rev. T, November 3
th
, 2006
Page 94
Appendix J. IDU output power calibration with other BUCs
than SatLink 3000 and 403x
STM SatLink Terminal can be used together with the Norsat 1010/1020XRT, Invacom TUL-204,
JRC NJT5017F as well as various C-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.
J.1
Calibrating the IDU output power
This section describes how to calibrate the Tx output power when using one of the following ODU
transmitters:
•
Invacom TUL-204
•
Norsat 1010/1020XRT
•
JRC NJT5017F
•
C-band BUCs
Please refer to section 6.3.2 for the description of the calibration procedure for the STM SatLink 3000
and SatLink 403x.
Ensure that the STM SatLink Terminal configuration procedure in section 6.2 has been performed.
Ensure that the STM SatLink Terminal 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 Terminal to the ODU are connected.
Restart the SatLink Terminal (issue the CLI command
restart
), wait till the application has loaded and
the STM SatLink Terminal has locked to the received carrier. The receiver has successfully acquired the
forward link when the message
Forward link up
is displayed (see section 6.3.1 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 +10. (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.
