Agilent 1952-05 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 Vol. 3 No. 9-10 PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA MAY-JUNE, 1952 The -hp- Direct -Reading UHF Signal Generators THE -hp- Model 616A UHF Signal Gen Both generators provide c-w, pulse, and erator was designed as the first commer f-m type outputs. A versatile internal pulser cially-available direct-reading signal gener permits the pulse modulation to meet a va ator for the upper UHF region. It operates riety of requirements as to pulse rate, pulse over the range from 1800 to 4000 megacy length, and synchronization. The character cles. A second generator, the -hp- Model of typical output pulses is illustrated in Fig. 2. 614A, was subsequently developed for use Probably the most common use for signal over the 800 to 2100 megacycle range as a generators is in testing receivers. For re companion instrument for the 61 6 A. The ceiver testing, it is desirable that the output 6l4A and 6l6A are similar in all character power from the generator be adjustable istics except frequency range. down to very low levels. Thus, the 61 4 A and Both generators have three outstanding 61 6 A have been designed to provide outputs characteristics that give them a high degree as low as 0.1 microvolt. This low level is of usability: they are direct-reading in fre more than sufficient to test present receivers. quency, direct-reading in output power, and The matter of high output from the gener cover a wide frequency range. The very real ator is of secondary importance in receiver value of these characteristics will be recog testing. A maximum generator output in the nized at once by those who have worked order of a hundred microwatts is usually with frequency charts and power