Introduction
1-12 1705A Spectrum Monitor
L- Band Input Signals
At the present time thereare numerous satellites in geostationary orbit. The
transponderson each h ave specific assigned functions, which makes it essen tial
to accomplish at least four things before illuminating a particular transponder:
1. Locate a satellite.
2. Identify the satellite.
3. Find the transponderand check availability with the satellite operator.
4. Optimize signal strengthand polarization.
Once a satelliteis located and a particular transponderis identified, the 1705A
frequencyreadout can be set so that the entire range of transponder frequencies
can be readdirectly 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
severalcustomizing routines that can be used to tailor displays for ease of
operation. In particular the Readout Mode routine provides for frequencyoffset,
so that the frequencydisplayed on the crt is the actual frequency of the trans-
ponder down link. The readout can be set to indicate any1. 10 GHzblock within
the rangeof 0.9 GHz to 20 GHz.
HELENA
BOISE
VANCOUVERBC
SEATTLE
PORTLAND
SANFRANCISCO
LOSANGELES
SANDIEGO
50dBw
47dBw
46dBw
44dBw
42dBw
Figure1 -5: The western spot beam footprint for one Ku-Band satellite