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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 - d p - L A B O R A T O R I E S
Vol 15. No 4
BLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA DECEMBER, 1963
A New Series of Microwave Sweep Oscillators
with Flexible Modulation and Leveling
IN microwave work one of the valuable and quency range from 1 to 40 gigacycles (kilomega-
inherently appealing test instruments is the mi cycles). A major factor in their convenience
crowave sweep generator. Such generators can derives from their use of a p-i-n diode type modu
greatly simplify difficult microwave investigations, lator in the output circuits ' of those generators
as discussed in several past articles1 on sweep- covering the 1 to 12.4 Gc region. This type of
frequency techniques. modulator permits the generators to be modu
A new series of microwave sweep oscillators lated or leveled with virtually no reaction on the
has now been designed which incorporates a num generated carrier frequency, since the voltages
ber of new conveniences. These oscillators, espe and currents in the oscillator tube remain con
cially when used with stant. As a result, more accurate frequency speci
SEE ALSO:
some of the advanced fications are possible in all operating functions.
High resolution microwave
spectrum examination, p. 8.
components recently 1 P. D. Lacy and D. E. Wheeler, "A New 8-12 kMc Voltage-Tuned Sweep Oscil
lator for Faster Microwave Evaluations", Hewlett-Packard Journal Vol. 8, No. 6,
developed in the -hp- Feb., 1957.
P D Lacy and D. E. Wheeler, "Permanent Record and Oscilloscope Techniques
laboratories-, make microwave sweep methods with the Microwave Sweep Oscillator", Hewlett-Packard Journal, Vol. 9, No. 1-2,
Sept.- Oct. 1957.
simpler, more accurate and more meaningful than - R B Riley, "A New Coaxial Crystal Detector with Extremely Flat Frequency
ever. Response", Hewlett-Packard Journal, Vol. 15, No. 3, Nov., 1963.
3 N J Kuhn, "A New Microwave Modulator", Hewlett-Packard Journal, Vol. 14,
The new sweepers collectively cover the fre No. 7 - 8, Mar. - Apr., 1963.
FREQUENCY (GC)
FREQUENCY (GC)
Fig. 1. New -hp- Microwave Sweep Oscillators collec Fig. 2. Comparison of leveled power incident upon a
tively cover frequency range from 1 to 40 Gc, have many typical-VSWR load when external lei-eling is used
conveniences for sweep-frequency type measurements. (upper curve) and when internal leveling is used
Either internal or external "leveling" can be used, but (lower curve). Equipment arrangements for making
external leveling is to be preferred, as discussed in text. curves are shown in Fig. 5 and discussed in text.
P R I N T E D I N U . S . A . C O P Y R I G H T 1 9 6 3 H E W L E T T - P A C K A R D C O .
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