Bird - 4421A Multifunction Power MetersDual Sensor Display. the Model 4421A is a Multifunction Power Meter to be used in combination with Bird’s Precision Power Sensors to display RF power readings with up to 0.5% accuracy. This intuitive display unit clearly identifies the Forward and Reflected power measurements within the RF path. In addition, return loss readings can also shown to provide additional insight into the RF system being monitored. The 4421A is the next generation replacement for the industry standard Model 4421. Building upon the original model’s high level of accuracy and its ease of use, the new 4421A enhances the meter’s functionality by utilizing a smaller/lighter design, and by providing the ability to have dual sensor inputs.

PRODUCT FEATURES

• Compatible with the full line of Bird's 402x-, 702X- and 703x-series sensors.
• Automatic sensor detection for seamless integration.
• Large 9.7" full color LCD touchscreen display for easy readability.
• Dual sensor option expands measurement capabilities.
• Compact, lightweight and portable design enhances functionality.

FUNCTIONS

• Forward Power in W or dBm
• Reflected Power in W or dBm
• Return Loss in VSWR, RL, or Reflection Coefficient

Product Selection Guide

Model Number	# of Sensors	# of Sensor Channels	Remote Computer Interfaces
4421A-10-00-0	Single 402x Sensor	1	None
4421A-20-00-0	Dual 402x Sensors	2	None
4421A-10-11-0	Single 402x Sensor	1	RS-232, LAN
4421A-20-11-0	Dual 402x Sensors	2	RS-232, LAN
4421A-12-11-1	Single 402x Sensor *Dual 702x / 703x Sensors	2	RS-232, LAN

* 702x/703x Sensors are currently supported for Average Power measurements. Pulse Power parameter measurements will be added with a free, in-field installable software update by the end of 2023.

product specifications

Attribute	Specification/Description
Item No.	Bird 4421A
Item Name	Multifunction Power Meter
Compatible Bird Power Sensors	4021, 4022, 4023, 4024, 4025, 4027 Series, 4028 Series, 702x Series, and 703x Series
Power Range	Sensor dependent
Frequency Range	Sensor dependent
Sensor Channels	Model dependent: 1 or 2
VSWR Display	1.0 to 199.9
Return Loss Display	0 to 40 dB
Display	9.7 in TFT full color LCD with touch screen
AC Power	100-240 VAC, 50-60Hz, 30 W
Fuse Rating	1A, IEC (5 x 20 mm), Time-Delay
Batteries	Type: Internal, rechargeable ， Life: Up to 7 hours ，Charger: Built-in. Approximately 4 hours to fully recharge.
Humidity	Max 95% (non-condensing)
Altitude	Max 4,600 m
Temperature	Operating: 0 to 40 °C ， Storage: -10 to 50 °C (limited by battery specification)
Dimensions	10.6 in x 9.7 in x 3.6 in (269 mm x 246 mm x 91 mm)
Weight	Less than 5 lb (2.27 kg)
Certifications	CE Compliant ，Shock and Vibration: MIL-PRF-28800F Class 4

Note: For the "Temperature" specification, the storage temperature range is limited by the battery specification, and storage outside this range may degrade battery performance. For best performance, a full recharge is recommended every 6 months or if stored below 0 °C.
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