Operating Instructions

Customizing Frequency Readout

The type and location of the readout for the TEKTRONIX 1705A Spectrum Monitor can be changed from the front panel. The options available are: 1. The choice of having readout or turning it off. 2. The position on the crt where the readout appears. 3. A customized readout that displays the satellite transponder frequency rather than the L-Band tuner frequency.

The auxiliary setup menu used to make these selections is brought up to the crt when both ←SPAN/DIV→ buttons are pushed simultaneously. Figure 2-10 shows the selections that are available from the crt menus. Pushing the designated front-panel switch accomplishes the specified menu task. Note that the solid lines in Figure 2-10 denote how to work through the menus, while the dashed lines show how to exit from the menu and return to the normal monitor display.

The readout control options share a software routine with the operator diagnos- tics (Test) in the Main menu. The Main menu, along with the Readout Mode and Test menus, use a cursor and select method of operation. With these menus the selection is marked by moving the cursor, up with the SPAN→ push button or down with the ←SPAN push button, and pushing the INPUT button to complete the selection.

The Readout Position and Offset Adjust menus assign other functions to some of the front-panel push-button switches. For these specific functions the names in brackets correspond to front-panel switch names.

Turning On or Off Readout The selections for disabling/enabling the crt readout are contained in the Readout Mode menu. Readout is turned off by setting the displayed cursor (>) next to the OFF selection and pushing the INPUT push button. Readout is turned on by moving the displayed cursor next to ON and pushing the INPUT push button. Once the function is selected pushing the INPUT push button a second time returns to normal monitor operation.

Changing Readout Position

Pushing the RESOLUTION, VIDEO, ←SPAN, and SPAN→ push buttons after the Readout Position auxiliary menu has been displayed moves the readout around the crt area. Readout can be anywhere within the crt area. See Figure

2-10 for the function of the push-button switches in the Readout Position menu.

Pushing any one of the four (newly assigned positioning) buttons returns to the normal display, with readout. At this point, pushing RESOLUTION, VIDEO, or either of the SPAN buttons moves the readout. Push buttons can be held down for smooth advancement, or pushed for each small movement increment. Once the readout location is satisfactory, pushing the INPUT button saves the position and returns to the Main menu. When the INPUT push button is pushed again, the monitor returns to normal operation.

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1705A Spectrum Monitor

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Tektronix 1705A instruction manual Customizing Frequency Readout