PTP 820C Quick Start Guide
Page 21
Antenna Alignment and Optimization
1.
Align the antennas with only one co-polarized
carrier activated. To mute the second carrier,
select the carrier in the Radio Parameters page of
the Web EMS (Radio > Radio Parameters) and set
TX mute to O
2.
Adjust the antenna alignment until you achieve
the maximum RSL for the first-carrier link (the
“RSLwanted”). This RSL should be within
approxi/-3 dB from the expected level.
3.
Unmute all carriers.
4.
Check the XPI in the Modem XPI field of the Radio
Parameters page in the Web EMS. The XPI should
be at least 25dB. If it is not, adjust the OMT
assembly on the back of the antenna at only one
side of the link to maximize the XPI. Adjust the
OMT by rotating the OMT and its attached ODU on
the back of the antenna. Loosen the four bolts that
connect the OMT to the antenna. Move the OMT in
small increments. After each increment, refresh
the Web EMS screen and review the XPI reading. It
is recommended to achieve XPI levels between
25dB and 30dB. Once a good XPI has been
achieved, lock-off the OMT by securing the bolts,
progressively, so as to not de-align the OMT.
Note
In some cases, the XPI might not
exceed the required 25dB minimum
due to adverse atmospheric
conditions, such as heavy rain. If
you believe this to be the case,
maximize the XPI by following the
alignment process described above.
Afterwards, monitor the XPI to
ensure that it exceeds the 25dB
minimum when propagation
conditions improve.
RSL Connector
Source
field.
TX mute
field.
Modem
XPI
field.
Radio
Parameters Page
