Model 99 Military Distance-Measuring Instrument


SURVEYING INSTRUMENT, DISTANCE-MEASURING, ELECTRONIC MICROWAVE
12-24 VDC & 115v 1PH 60HZ
CALIBRATION CONSTANT 8.25CM
MODEL 99 SERIAL 201
FSN 5675-089-8886
APPLIED DEVICES CORP.
COLLEGE POINT, NEW YORK
CONTRACT NO. DAAK01-67-C-D484

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The model 99 surveyng instrument is a CW microwave tranceiver operating between 10.1 and 10.3 GHz with 30mW power. Two of these are set up and aimed at each other and the distance is indicated on an electromechanical digital readout. Not only does it measure distance from 200M to 50KM with an acuracy of a couple of cM, it also provides voice communication between the two units. It is of great interest as well to Amateur radio operators since it operated in the 10.0GHz to 10.5GHz band and is basically a "ready to use microwave communications set in a box". RF power is provided by a Varial VA-203K tunable klysron. All internal DC voltages are derived from an internal switching power supply that operates from batteries or an external 12 or 24 volts DC supply. The highest internal voltage is 300VDC, the lowest, 5VDC. An optional 115VAC supply can be used to provide DC power for the unit.

Besides the unit shown open for inspection in the lab, there are six more of them in the crates, a total of seven instruments. It takes two to do a measurement or set up a voice link.

There is also a similar instrument, perhaps compatible (same contract?), described as "X BAND RANGING Freq. Band: 10.1-10.3 GHz. Pwr. Output: .03 Watts. Range: 200 meters-50 Km. Indicator: Dial Type. Klystron Type: VA-203K. Rep rate: CW. Antenna: 12" dish. Pwr input: 12 VDC, 115V, 60 Hz. Mfr: Fairchild MC-8.", advertsied by Radio Research Instrument Co.. That seems very much like the model 99 here.

Notes:
(1) Image from USGS website. Many more images and much more information about surveying and geology can be found there.