DESCRIPTION:
The Bird Technologies 4431 Signal Sampling RF Wattmeter is a rugged, portable directional wattmeter built on the trusted Bird Model 43 Thruline® design, enhanced with an integrated RF signal sampler probe that provides a low-power sample of the measured signal via a female BNC connector. This sampled output can be adjusted with a front-panel control knob and connected to external test equipment such as frequency counters, spectrum analyzers, or oscilloscopes for monitoring frequency, modulation characteristics, or harmonics without disrupting the main measurement path.
The meter uses interchangeable Bird plug-in elements to define its frequency and power range, giving flexibility in measurement deployment across a broad RF spectrum. The analog meter movement and directional coupler provide average forward and reflected power readings, making the 4431 suitable for transmitter tuning, antenna system verification, and general RF diagnostics.
Typical Use Suitability:
Ideal for laboratory, field service, and RF system verification where simultaneous average power measurement and signal sampling are needed — for example, verifying transmitter output while observing spectral content or modulation traits with external instruments.
Key Features
-
Average RF power measurement using Bird plug-in elements.
-
Integrated variable RF sampler with female BNC output for external signal monitoring.
-
Adjustable sample strength (typically –15 dB to –70 dB) via front-panel control.
-
Broad frequency coverage: approximately 2 MHz to 1.2 GHz (element dependent).
-
Power handling: up to 5 kW max from 2–30 MHz and 1 kW max from 30–1000 MHz (dependent on element and coupling).
-
Accuracy: ± 5 % of full scale typical over usable range.
-
Quick Change (QC) connectors for flexible element interface.
-
Directional design supports forward and reflected power diagnostics.