HP 618B Service manual

UHF SIGNAL GENERATOR

SPECIFICATION

SFrequency Range:Calibration:Frequency Stability:Output Range:Output Accuracy:Internal Impedance:Modulation:Internal Pulse Modulation:Sync Out Signals:External Synchronization:InternalSquare Wave Modulation:Internal Frequency Modulation:External Pulse Modulation:Sxternal Frequency Modulation:Power Source:Size:Weight:Accessories Supplied:3,800 to 7,600 mc covered in a single band. Repeller voltageautomatically tracked and proper mode automatically selected.Direct reading. Frequency calibration accuracy better than il%.Frequency variation less than 0.006% per degree centigradechange in ambient temperature: line voltage change of *lo%causes less than .02% frequency change.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.Within i t 2 db from - 7 dbm to -127 dbm, at the end of 6 ft.output cable, terminated in 50-ohm load.50 ohms nominal. (VSWR less than 2 )Internal or external pulse, fm and square wave.Repetition rate variable from 40 to 4000 pps, pulse width variable1/2 to 10 microseconds.1) Simultaneous with rf pulse - positive.2) In advance of rf pulse - positive, variable 3 to 300 microseconds.(Better than 1 microsecond rise time and 25 to100 volts amplitude into 100 ohms load.)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.Variable 40 to 4000 GPS, controlled by “pulse rate” control.Saw-tooth sweep rate adjustable 40 to 4000 cps. Frequencydeviation up to i 3 mc.Pulse requirements:negative, width 0.5 to 2500 microseconds.amplitude from 15 to 70 volts positive orProvides capacitive coupling to repeller of klystron. Maximumdeviation approximately i5 mc.115/230 volts *lo%5, 0 to 60 cps, 250 watts.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.Cabinet Mount: Net 95 lbs., shipping 118 Ibs.Rack Mount: Net 96 lbs., shipping 119 lbs.AC-16Q Cable Assembly, 6 feet of specially treated RG9A/U50 ohms coaxial cable terminated at each end with UG-21B/UType N male connectors. Each cable is tested and selected forminimum s w r at frequencies above 4000mc.