82 iDirect Satellite Router Installation and Commissioning Guide
iDX Release 3.3
Performing Cross-Pol Adjustment
14.2.1 Preparation
Follow the steps below to prepare for satellite access and cross-pol adjustment:
To Prepare for Satellite Access:
1. Loosen the fasteners securing the feed, as well as t
he hose clamp on the BUC, so that the
entire assembly (feed, BUC, and LNB) rotates freely.
2. Provide the final antenna pointing voltage reading to the N
etwork Operator. The Network
Operator records the value.
3. Obtain the test frequency from
the satellite access controller.
4. In RF Uplink Frequency
in iSite (Figure 46) or Web iSite (Figure 47), enter the test
frequency.
Note: The BUC LO Frequency is read from the options file loaded on the Satellite
Router. Using the RF
Uplink Frequency and BUC LO Frequency, the L-band TX
Frequency is calculated automatically.
5. Verify with the Network Operator that the displayed L-ba
nd TX Frequency is correct.
6. In Adjust Transmit Power,
set power to -35 dBm.
14.3 Performing Cross-Pol Adjustment
During adjustment of the antenna feed, the satellite access controller observes the
transmitted signal on a spectrum analyzer, switching from co-pol to cross-pol to compare
levels. The controller will ask for power to be increased until sufficient energy is available to
detect the cross-pol signal. At that time a polarity adjustment is made. The controller may
ask for more changes in transmit power and additional polarity adjustments as needed until
the required level of isolation is achieved.
The access controller will not specif
y a transm
it power in absolute terms, such as -35 dBm or
-20 dBm. Instead, the controller will ask for power increases or decreases in relative terms,
such as a 1 dB increase, or a 2 dB decrease. Perform the following procedure when instructed
by the access controller.
To Start the CW Carrier and Adjust TX Po
larity Isolation:
1. If using iSite, click the Start CW
button in the Cross Polarization dialog box (Figure 46).
Note: iSite may generate an error message after clicking the Start CW button. If
this
happens, click the Stop button and try again.
2. If using Web iSite:
a. In the Modulation field of the Modulator se
ction, select Off CW (Figure 47).
b. Click the St
art button.
3. In iSite or Web iSite, adjust the transmit power as instructed b
y the access controller by
selecting the appropriate power value in the Transmit Power section of the Cross
Polarization screen. (See Figure 46 or Figure 47.)
4. At the inst
ruction of the access controller, rotate the feed slowly in one direction. Move
the assembly in small (1/2°) increments.
To Next Page
Loading...
