Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1964-06
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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 - t i p - L A B O R A T O R I E S
Vol. 15, No. 10
UBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA JUNE, 1964
Precision Plug-In Frequency Measurements
to 3000 Me
A new plug-in converter for the -hp- high-speed
counter extends the simplicity of the frequency counter
up to 3000 Me at resolutions up to 3 parts in 10".
XRECISION frequency measurements as high as troposcatter communications systems, of micro
3000 Me can now be made with a new frequency wave aircraft navigation aids, of telemetry sys
converter plug-in for the -hp- 50 Me Counter. tems in the TRIG 2.2 Gc band, and of other UHF
This 3000 Me capability represents a significant devices.
increase in the frequency range of heterodyne The new plug-in, -hp- Model 5254A, uses the
converters for electronic counters. With the new heterodyne frequency translation principle. This
plug-in, the -hp- Model 5245L Counter is now technique, in combination with a high speed
able to directly measure the frequencies of UHF counter, has been used by -hp- for precise VHF
SEE ALSO:
Changes in NBS Broadcasts, p. 5
Changes in Navy VLF Frequencies, p. 5
New four-channel 40 Me scope plug-in, p. 6
2 50J L2 55 30Gc
TUNING DIAL POSITION
Fig. 2. Plot of output of new -hp- 3 Gc counter plug-in
Fig. 1. New -hp- 300 to 3000 Me Converter being used vs tuning dial position; plot made while frequency to be
with -hp- 5245L Counter at backscatter range facility measured was applied. Two responses are desired re
of Micronetics, Inc., San Diego, Calif. Converter and sponses from converter harmonics immediately below
counter are used in precisely establishing UHF, L-band, and immediately above measured frequency. Freedom
and S-band frequencies used in making radar cross-sec from spurious responses is evident. Cavity selectivity
tion measurements. Here, Warren T. Fey, techniques has been designed to bring saddle between responses to
engineering manager, checks frequency of one of Micro a level far below "measure" region of plug-in's meter,
netics' range transmitters. thus preventing measurement errors.
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