The Model 43 THRULINE
® Directional Wattmeter accurately measures
forward or reflected power in coaxial transmission lines under any load
condition. Each Model 43 consists of a line section, "QC" (Quick Change)
connectors and an indication meter housed in a rugged, corrosionresistant
aluminum case.
The line section is a high-precision 50 OHMS coaxial air line that inserts
between the transmitter and the antenna or load. A socket is provided in
each line section for a plug-in element with the desired power rating and
frequency range. Line section ends are equipped with "QC"
-type connectors.
The model 43 is supplied with two female "n" -type "QC" connectors.
These connectors can be interchanged in the field without affecting
instrument calibration.
The Instrument's indicating meter is a shock-mounted 30-microampere
meter with scales of 25, 50, and 100; permitting full-scale direct-power
reading from 100 milliwatts to 10,000 watts.
Plug-in elements determine the power rating and the frequency range,
and these values are marked on each element. The elements rotate to
read both forward and reflected power. There is no need for calibration
charts or instrument adjustments. Elements can be purchased at any
time and replaced in the field. For added convenience, Model 43
connectors and elements are interchangeable with many other
Bird wattmeters.
Remote installation can easily be achieved by removing the Model 43's
RF line section and inserting it at any desired point in the line. For best
visibility, the meter itself can be relocated using the 32" meter cable
supplied in the instrument housing. Additional meter cable lengths can
be ordered separately.
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