The Telewave RF Wattmeter Model 44L1P is a compact, versatile instrument used for direct measurement of forward and reflected RF power in a coaxial transmission line under any load conditions. Wide band capability and dynamic range allows operation without elements, inserts, or band switching. The 20 microamp taut-band meter movement is shock mounted in a rugged, die cast housing, making this instrument ideal for mobile radio installation in aircraft or vehicles, as well as base stations.
Model 44L1P includes an RF sampling port, with an output 40 dB below the total transmission line level, for frequency measurement, signal injection, or spectral analysis.
This wideband instrument covers 2 to 200 MHz with a power range of 1 to 500 watts. The meter movement can be turned off for protection when not in use. A leather carrying strap is provided for easy portability. The use of a taut-band meter movement allows operation in cold temperatures.
The RF sample port on Model 44L1P samples a low level of RF power as it passes through the instrument. This bi-directional port is accessed via a BNC connector located on the side of the meter. It allows injection of a signal into the device under test, or can be used for spectrum analysis and frequency measurements without affecting operation of the meter.
The Model 44L1/L1P utilizes a set of precision directional detectors which sample forward and reverse CW power flow in a specially engineered section of transmission line. The sampled current is scaled to drive the 20 μA taut band meter. Forward and reflected power can be directly measured by rotating the FWD-REV switch. VSWR (Voltage Standing Wave Ratio) is easily determined by comparing these measurements and using the convenient chart on the back of the instrument.
Five power scales are provided. The 500 watt scale will test most high powered transmitters, while the 5 watt scale makes it simple to tune low powered portables. The excellent stability of this unit and the ability to switch it from one power range to another to check the calibration eliminates the need for a secondary standard to verify calibration.