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Introduction
1-12
1705A Spectrum Monitor
L- Band Input Signals
At the present time there are numerous satellites in geostationary orbit. The
transponders on each have specific assigned functions, which makes it essential
to accomplish at least four things before illuminating a particular transponder:
1. Locate a satellite.
2. Identify the satellite.
3. Find the transponder and check availability with the satellite operator.
4. Optimize signal strength and polarization.
Once a satellite is located and a particular transponder is identified, the 1705A
frequency readout can be set so that the entire range of transponder frequencies
can be read directly from the 1705A display. As it is shipped from the factory
the 1705A provides a readout in MHz for both bands. However, the 1705A has
several customizing routines that can be used to tailor displays for ease of
operation. In particular the Readout Mode routine provides for frequency offset,
so that the frequency displayed on the crt is the actual frequency of the trans-
ponder down link. The readout can be set to indicate any 1.10 GHz block within
the range of 0.9 GHz to 20 GHz.
HELENA
BOISE
VANCOUVER BC
SEATTLE
PORTLAND
SAN FRANCISCO
LOS ANGELES
SAN DIEGO
50dBw
47dBw
46dBw
44dBw
42dBw
Figure 1-5: The western spot beam footprint for one Ku-Band satellite