762-2A Spectrum analyzer
DESCRIPTION OF EQUIPMENT
1-4. The Model 762-2A Microwave Spectrum Analyzer, hereinafter referred to as the analyzer, is a self-contained field and laboratory spectrum Analyzer
which operates in the frequency range for 10 MHz to 40 GHz. The Analyzer
consists of two modules, the Model 712-2A Standard Persistence Display Unit and the Model 809-2A Microwave Tuning Unit, in an enclosure with a removable cover. Accessories
and tools stored in the enclosure removable cover include the following:
Mixer, Part No. 110571
Mixer, Model 7120A, KU Band, Part No. 109334 Transition, 26.5-40. 0 GHz, Part No. 110572
Fuse 1/2A, SB, 250V, Part No. 107592 Warning Tag for Fuse, Part No. 109278 Attenuator, Fixed Res N-Pad 10 DB, Part No. 108326 Attenuator, Fixed Res N-Pad 20 DB, Part No. 108327 Attenuator, Fixed Res N-Pad 40 DD, Part No. 108328 External Mixer Cable, Part No. 110567 Power Line Cable, Part No. 107089 Extender Card Assembly, Part No. 10961701 Tuning Unit Extender Cable, Part No. 109618 IF Rack Extender Cable, Part No. 109620 Coax Fitting Wrench, Part No. 109623 Board Extractor Tool, Part No. 109241
An Operation and Service Manual, Part No. 110578
, is also supplied with each instrument
1-5. CAPABILITIES AND PERFORMANCE
1-6. The Model 762-2A microwave spectrum Analyzer
is intended for multiple laboratory or field uses in connection with communications and surveillance equipment. Detailed performance specifications for the Model 762-2A are given in table 1-1.
Salient features of the system are summarized in the following paragraphs.
1-7. EXTERNAL POWER REQUIREMENTS. The Model 762-2A is capable of operating on AC line voltage of 115/230 ±10% volts, 50 to 60/400 Hz, single phase. Power dissipation is approximately 52 watts.
1-8. FREQUENCY RANGE. The Model 762-2A uses fundamental and harmonic mixing to cover the frequency range from 10 MHz to 40 GHz. This frequency range is covered in seven bands, with band selection accomplished by a front panel control.
The frequency reading is indicated on a slide rule dial which is accurate to within 1% of dial reading ±2 MHz.
1-9. HORIZONTAL DISPLAY. The frequency scan width on the horizontal (frequency) display is adjustable with 17 calibrated fixed positions of the scanwidth control between 10 kHz (1 kHz/division) and 2 GHz (200 MHz/division) full scale. A zero dispersion mode is also provided. The sweep time is selectable in seven calibrated steps between 30 seconds (3 seconds per division) to 30 milliseconds (3 msec per division). In the fast sweep mode, five calibrated sweep speeds are provided from 10 milliseconds (1000 microseconds per division) to 100 microseconds (10 microseconds per division).
The sweep can be internal free-running, synchronized to the video trigger, to the AC power line, or initiated by a single sweep pushbutton on the front panel. Manual sweep (controlled by a single-turn-potentiometer on the front panel) can also be selected.
1-10. VERTICAL DISPLAY. Either a linear or logarithmic amplitude may be selected. In the linear display mode, the display amplitude is proportional to the signal voltage. In the logarithmic display mode, the display amplitude is compressed according to a logarithmic function.
1-11. STABILIZATION. The first local Oscillator
is stabilized automatically at scanwidth settings at and below 500 kHz/division. Stabilized operation of the first local Oscillator
is indicated by a light on the front panel. A front panel control switch disables the stabilization circuitry when selected.
1-12. IF BANDWIDTH. Five IF bandwidths of 300 Hz, 1 kHz, 10 kHz, 100 kHz, and 1000 kHz are provided to permit selection of optimum resolution for the spectrum analysis of signals of interest.
1-13. IF GAIN AND ATTENUATION. IF attenuation, in 1 dB steps up to 51 dB, can be used to adjust-overall gain of the Analyzer
. The IF gain is continuously adjustable from 0 to 60 dB.
1-14. CAMERA RECORDING. A bezel adapter for camera recording may be applied to the Analyzer
as an option. Illumination of the edge-lighted graticule is controllable from a front panel potentiometer.
1-15. EXTERNAL MIXERS. Two external waveguide mixers, Part No. 109334 and 110571, a waveguide transition, Part No. 110572, and an external mixer cable,
Part No. 110567 are supplied for processing signals in the KU, K, and KA bands.
For the KU-band (12.4 - 18.0 GHz) use Part No. 109334 mixer, Model 7120A. For the K-band (18.0 - 26.5 GHz), use Part No. 110571 mixer. For the KA-band (26.5 -40.0 GHz), use Part No. 110571 mixer and Part No. 110572 transition.