Tektronix 1705A instruction manual 12.00 GHZ

Operating Instructions

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-

2- 16 1705A Spectrum Monitor