4431, Signal Sampling RF Wattmeter
4431
RF Wattmeter
Power Measurement with Built-In Signal Sampling
The Bird Model 4431 is a portable, analog wattmeter based on the trusted Model 43—enhanced with an integrated RF signal sampling port. It provides average power measurement using Bird’s interchangeable plug-in elements, while also offering a low-power sampled output via a BNC connector. This lets technicians monitor frequency, modulation, or harmonics using external equipment without disturbing the signal path. Ideal for lab work, tuning, and system verification.
Why Choose the 4431?
Measure and Monitor
Read average RF power and monitor the live signal simultaneously, from one instrument.
Adjustable Sample Output
Use the front-panel control to set RF sample strength for counters, analyzers, or scopes.
Built on the Model 43
Same rugged build, analog display, and element compatibility now with added signal visibility.
How It Works
The Model 4431 uses a directional coupler and analog meter movement to measure average forward or reflected power. In addition, an internal RF probe taps the signal and routes a low-power sample to a BNC connector on the right side of the meter. The technician can adjust output level using the front-mounted control knob, making it easy to connect to and protect external test equipment.
Monitor Live RF Without Interrupting the Signal Path
- Connect directly to a spectrum analyzer, frequency counter, or oscilloscope.
- Safely observe frequency, modulation, or harmonics while measuring power.
- Use the front-panel knob to adjust sample level for test equipment input.
Specifications
- Power Range: 2 MHz to 1.2 GHz
- Frequency Range:
- 45 kW max. 2 to 30 MHz
- 1 kW max. 30 to 1000 MHz
- Accuracy: ±5% of reading
- Connectors: (2) Type N (F) | (1) BNC (F)
