Model 618B
SPECIFICATIONS
Frequency Range: 3,800 to 7,600 mc covered in a single band. Repeller voltage
automatically tracked and proper mode automatically selected.
Calibration: Direct reading. Frequency calibration accuracy better than il%.
Frequency Stability: Frequency variation less than 0.006% per degree centigrade
change in ambient temperature: line voltage change of *lo%
causes less than .02% frequency change.
Output Range: 1 milliwatt or 0.223 volt to 0.1 microvolt (0 dbm to -127 dbm)
into 50 ohms. Directly calibrated in microvolts and db.
Coaxial Type N connector.
Output Accuracy: Within it2 db from - 7 dbm to -127 dbm, at the end of 6 ft.
output cable, terminated in 50-ohm load.
Internal Impedance: 50 ohms nominal. (VSWR less than 2 )
Modulation: Internal or external pulse, fm and square wave.
Internal Pulse Modulation: Repetition rate variable from 40 to 4000 pps, pulse width vari-
able 1/2 to 10 microseconds.
Sync Out Signals: 1) Simultaneous with rf pulse - positive.
2) In advance of rf pulse - positive, variable 3 to 300 micro-
seconds. (Better than 1 microsecond rise time and 25 to
100 volts amplitude into 100 ohms load.)
External Synchronization: 1) Sine wave: 40 to 4000 cps, amplitude 5 to 50 volts rms.
2) Pulse signals: Zero to 4000 pps and 5 to 50 volts amplitude,
both positive and negative, pulse width 0.5 to 5 microseconds,
rise time 0.1 to 1 microsecond.
Internal
Square Wave Modulation: Variable 40 to 4000 GPS, controlled by ?pulse rate? control.
Internal Frequency Modulation: Saw-tooth sweep rate adjustable 40 to 4000 cps. Frequency
deviation up to i3 mc.
External Pulse Modulation: Pulse requirements: amplitude from 15 to 70 volts positive or
negative, width 0.5 to 2500 microseconds.
Sxternal Frequency Modulation: Provides capacitive coupling to repeller of klystron. Maximum
deviation approximately i5 mc.
Power Source: 115/230 volts *lo%, 50 to 60 cps, 250 watts.
Size: Cabinet Mount: 17-1/2 in. wide, 14 in. high, 19-1/2 in. deep.
Rack Mount: 19 in. wide, 14 in. high, 17 in. deep behind panel.
Weight: Cabinet Mount: Net 95 lbs., shipping 118 Ibs.
Rack Mount: Net 96 lbs., shipping 119 lbs.
Accessories Supplied: AC-16Q Cable Assembly, 6 feet of specially treated RG9A/U
50 ohms coaxial cable terminated at each end with UG-21B/U
Type N male connectors. Each cable is tested and selected for
minimum swr at frequencies above 4000mc.
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ACEC
