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1705A Spectrum Monitor
1-1
Section 1
Introduction
The TEKTRONIX 1705A Spectrum Monitor is an 8½” wide by 5¼” high
special purpose spectrum analyzer. It weighs approximately 8½ pounds and is
powered from an ac source. The crt occupies approximately two-thirds of the
front-panel area, with the control panel taking up the remainder of the space.
Operation is controlled by a microprocessor that polls the front-panel switches.
Front-panel switches are of the momentary touch type with lighted functional
indicators. In addition to polling the front panel, the microprocessor provides
the characters for an alphanumeric crt readout.
The signal is displayed on a bright crt. It is of the mesh type, for better
geometry, and uses an internal graticule to reduce parallax. Variable graticule
scale illumination provides even lighting over the usable graticule area to
improve measurement accuracy and the quality of display photographs.
The 1705A Spectrum Monitor is a swept front-end superheterodyne-type
spectrum analyzer with two inputs; L--Band to accommodate Low-Noise
Amplifier/Block Down Converter (LNB) outputs, and 70 MHz for use with
Video Exciters. The L--Band input (950 to 1800 MHz) is through an F-type
connector, while the 70 MHz input is through a standard bnc connector. The
L--BAND INPUT connector is the output for the selectable 18 V supply that is
the Block Down Converter auxiliary power.
Typical Configurations
The TEKTRONIX 1705A Spectrum Monitor is designed primarily for use in
locating satellites and monitoring their signals. It is designed so that it can be
rack mounted, in a dual-width rack adapter, along with a half-rack waveform
monitor, such as a TEKTRONIX 1740-Series Waveform/Vector Monitor.
However, it can be used as a portable instrument. It is intended to be connected
to the rf feed with a directional connector. See Figure 1-1. It is capable of
providing the dc power required to run an LNB. The auxiliary LNB power is
turned on or off by a rear-panel slide switch. An indicator on the rear panel
lights when the +18 V supply is operating normally.