Appendix I. IDU Power Calibration and P1dB Configuration
with BUCs Other Than the SatLink 403x
The VSAT can be used together with various 3
rd
party BUCs for C-, Ku-, Ka-, and EHF-band. 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 and
configure the P1dB 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 an integrated power detector. Please refer to section 6.4.2 for the description of the
calibration procedure for the SatLink 403x.
Ensure that the VSAT configuration procedure in section 6.2 has been performed.
Ensure that the 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 VSAT to the ODU are connected.
Restart the SatLink VSAT (issue the CLI command restart), wait until the application has loaded and
the 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).
Log on as the install user (user = install, factory default password = dvbrcs).
Call the control center 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>
The variables pow and freq are defined as follows:
pow = TX IDU output power level 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
The above example will transmit a CW from the ODU output at 14.1 GHz with an IDU output power
level of –30 dBm from the VSAT.
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