Agilent 1955-06 free download

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HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S .ISHED CALIFORNIA THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA JUNE, 1955 The New -hp- 15-21 KMC 10 MW Signal Generator THE NEW -hp- 15-21 kilomegacycle signal generators, a direct-reading frequency dial is generator is designed as a general-purpose obtained by mechanically tracking the resona instrument which will give engineers working tor plunger with repeller voltage. The fre in the 1 5-2 1 kmc region the same conveniences quency range is covered by using parts of two and accuracy that have led to the wide accep modes, and mode switching is performed auto tance of the other -hp- microwave generators. matically by the repeller tracking mechanism. To this end the generator provides at least 10 The klystron temperatures are kept at a low milliwatts ( + 10 dbm) of max value by drawing air through the louvred por imum output over its com tion of the front panel directly across the tube plete frequency range, is di and resonator. rect-reading in frequency to within 1%, has a R-f power from the klystron is fed to a sim direct-reading, accurate 100 db output attenu ple uncalibrated attenuator. This attenuator ator, and is provided with a flexible modulator serves as the power set control and permits the which gives pulse, square-wave or f-m modu attenuator output to be standardized to the lation. nominal maximum output value of 10 milli A block diagram of the circuit arrangement watts (in practice, at least 20 milliwatts are of the new generator is shown in Fig. 2. The usually obtainable). The power level at the at oscillator uses a type V40B reflex klystron op tenuator output is then monitored by a temper erating with an external waveguide resonator ature- and sensitivity-compensated thermistor which is tuned by a non-contacting type plun