Tektronix 1705A - Manual (Page 55)

Operating Instructions
2- 16 1705A Spectrum Monitor
transponder frequency. Changing the readout to reflect these frequencies is
easily accomplished by selecting the Readout Mode from the Main menu and
Offset from the Readout Mode menu, which brings up the Offset Adjust menu.
Selecting Offset allows the readout units to be changed to GHz and the frequency
set to a value between 0.9 and 20. Push buttons can be held down for smooth
advancement or pushed for each small movement increment. Maximum and
minimum readout can only 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-end rotation. See Figure 2-11 for an example of the
display during Offset Adjust.
12.00 GHZ
Figure 2-11: An example of the readout displayed while satellite frequency is being
set. The
∆ is the same for both increasing and decreasing frequency
When Offset is selected from the Readout Mode an additional auxiliary menu
appears on screen for several seconds before it extinguishes and the spectrum
analyzer display with GHz readout appears. Refer to Figure 2-10. Pushing the
SPAN
→ push button causes the numerical part of the readout to scale upward
toward 20. Pushing the
←SPAN push button scales down the numerical readout
toward 0.9.
Once the readout has been changed to GHz, the frequency display can be altered
to show frequencies ascending or descending from left to right. When L.O. High
is selected turning the front-panel CENTER FREQUENCY clockwise incre-