A P P E N D I C E S
Series 8000™ O&M Manual
147
A-12.6
Steptrack Test
1.
Point the antenna at a geostationary satellite and observe the
receive signal level for 1
–
2 minutes. Record the signal variation
(in dB) here: ____________________
Note:
if the observed variation is more than 0.1dB, it will be dif-
ficult to evaluate the steptrack performance, because signal var-
iation affects performance.
2.
Set up a new target satellite in steptrack mode* and record
the settings in the table below:
Longitude (deg E)
Inclination (deg)
RF Input
POL (deg)
Receive level @ 0dB
(see 6.3 note above)
Beacon frequency (MHz)
Low signal (dB)
Receive beamwidth (deg)
Deadband (% BW)
Step size (% BW)
Max step (% BW)
Max steps per cycle
Steptrack cycle time
Follow model time
3.
In manual mode, move the antenna off beam center, in the
direction indicated in the following table, so the signal level
is -2dB.
Track the steptrack target created previously to cause the sys-
*
Note
Click in the “Receive
level @ 0dB”
field and
just press OK. This tells
the ACU to use the
current receive level
as
relative
0dB.
