Microwave Signal Generator 6459

This microwave signal generator, the 6459 by the Sanders Division of Marconi Instruments Ltd. has the following characteristics:

• Wide frequency range: From 3.5 to 12.0 GHz
• Direct reading frequency dial.
• Direct reading attenuator, calibrated in voltage and dBm
• Internal FM, CW pulsed or square wave modulation.
• The pulse repetition rate is variable from 40 to 4,000 pps and pulse width from 0.5 to 10 microseconds.
• Synchronising signals are simultaneous with the Rf pulse or between 3 and 300 microseconds in advance of the Rf pulse.
• The internal pulse generators can also be synchronised by means of external signals.
• Power output: (a) direct 80 mV. (b) 0.223 V to 0.1 µV (0 to -127 dBm) between 4.5 to 11.0 GHz and -6 dBm to -127 dBm between 3.5 and 4.5 GHz. Above 11.0 GHz the output power is generally better than -6 dBm into a 50 Ω load.
• Power output accuracy: Within ± 2 dB from -7 dBm to -127 dBm when terminated in a 50 Ω load, within the frequency range 3.5 to 11.5 GHz.  

The signal generator incorporates a plug-in klystron oscillator in an external coaxial line cavity. Frequency is determined by the position of a movable non-contacting piston, which is coupled to the frequency scale, and an automatic tracking network and the output level is read in dBm and µV from the directly calibrated, internal, high precision attenuator.
Temperature compensation, applied to the power meter bridge, enures virtual freedom from the effects of ambient temperature changes

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