Operating Instructions
1705A Spectrum Monitor 2-17
ments the frequencyreadout (low to high) and moves the brightened portion of
the sweep fromleft to right. When L.O. Low is selectedthe readout decrements
(high to low) and thebrightened portion of the sweep moves from left to right,
with clockwise rotation of the CENTER FREQUENCY.
When L--Band is selected from theR eadoutMode menu, the Main menu returns
and the readoutis scaled in MHz. Changes of frequencyreadout are shown in
ascending orderwhen the front-panel CENTER FREQUENCY control is rotated
clockwise.
Once the satellitefrequency and L.O. have been set, pushing the INPUT push
button saves the displayand returns the Main menu. Pushing the INPUT push
button again returnsto normal monitor operation.
NOTE. The 1705A must be returned to the normal operating routinebefore the
front-panelpush-button switches perform the label functions. Push the INPUT
push-button as many times as requiredto bring up the spectrum analyzer
display.
The series of tests that can be made are documented in Section 6 , Maintenance,
under the sub-sectionheading of “General TroubleshootingTechniques.”
Locating Ku -Band Satellite sThe TEKTRONIX 1705A Spectrum Monitoris specifically designed to help the
television news vehicleoperator quickly and properly address a satellite. Even
though the 1705A will be most oftenused for Ku--Band transmissions, it can be
used with any satellitesystem that can be downconverted to its L--Bandinput
frequencies.
The following operating procedure is typi cal and can be adjusted to fit particular
vehicle and operatorpreferences.
1. The expectedtrue azimuth and elevation to the satellite from a specific
location should be determinedby calculation or reference to Table2 --3 for
popular news satellites. Table 2--3lists 21 Continental United States
(CONUS) cities; the cities in the table arespotted around the country and
can help to approximate(the location of a satellite) from any area of the 48
contiguous states.