Telewave, Inc.
Model 44A/AP
Page 3
2 GENERAL DESCRIPTION
2.01 This manual provides the physical and functional description and
operating theory necessary for effective use of the Telewave Model
44A/AP Broadband Radio Frequency (RF) Wattmeter. Its features
include:
• Displays fi ve power ranges
• Measures 1 to 500 watts
• Does not require inserts
• Does not require band switching
• Fully operable in freezing conditions
• Provides 5 watts full scale range
• Interchangeable connectors (QC)
• Lighweight, rugged and easy to carry
• -40 dB RF sampling port (Model 44AP)
2.02 The instrument integrates two broadband directional couplers for
measuring incident and refl ected power, ranging, calibration and
display. The wide coverage and dynamic range of this instrument
eliminates any inserts or band switching. A 20 uA taut band me-
ter movement is used to display the measured power, providing the
measurement accuracy necessary to tune low power portable trans-
mitters.
2.03 A convenient, easy to read, voltage standing wave ratio (VSWR)
chart is provided on the rear of the instrument for determining
VSWR from the measured incident and refl ected power levels. The
instrument is designed for rugged fi eld use and is housed in a diecast
metal case with a leather carrying strap. The measurement circuits
in the wattmeter are driven directly by the current developed in the
coupler, making it unnecessary to supply AC power or batteries. A
carrying case (Model TC44) is available as an option. The Model
44A/AP is ideally suited for mobile, marine, and aircraft applica-
tions as well as base stations.
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