Operating Instructions
2-16 1705A Spectrum Monitor
transponderfrequency. Changing the readout to reflectthese frequencies is
easily accomplished by selecting the Readout Mode from the Main menu and
Offsetfrom the Readout Mode menu, which brings up the Offset Adjust menu.
Selecting Offsetallows the readout units to be changed to GHz and the frequency
set to a valuebetween 0.9 and 20. Push buttons can be held down for smooth
advancement or pushed for each small movement incremen t. Maximumand
minimum readout canonly be achieved with the CENTER FREQUENCY at the
appropriate extreme.
CENTER FREQUENCY control can change the range of readout (in L--Band)
by 1.1 GHz for full end-to-endrotation. See Figure 2-11 for anexample of the
display during OffsetAdjust.
12.00 GHZ
Figure2 -11:An example of the readout displayed while satellite frequency is being
set. The is the sam e for both increasing and decreasing frequency
When Offsetis selected from the Readout Mode an additional auxiliary menu
appearson screen for several seconds before it extinguishes and the spectrum
analyzerdisplay with GHz readout appears. Refer to Figure 2-10. Pushingthe
SPANpushbutton causes the numerical part of the readout to scale upward
toward 20. Pushingthe SPAN push button scales down the numerical readout
toward 0.9.
Once the readouthas been changed to GHz, the frequency display can be altered
to show frequenciesascending or descending from left to right. WhenL.O. High
is selected turning the front-panel CENTE R FREQUENCY clockwise incre-