Bird, 4381

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Bird, 4381
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Product description

The Bird 4381 is a digital RF wattmeter for two-way communications, avionics, C³, radar and many other applications. At the push of a button, this new wattmeter can perform the following functions:

  • Read incident and reflected CW and FM power in watts or dBm
  • Read incident and reflected peak-envelope-power of SSB/DSB and symmetrical AM in watts
  • Read incident and reflected peak pulse power as narrow as 50 micro-seconds in watts
  • Calculate SWR, dB return loss, percent modulation
  • Remember peak and valley readings when adjustments for maximum or minimum signal levels are made
  • Over-range at least 20 percent beyond nominal full scale
  • Frequency: 0.45 to 2700 MHz
  • Power: 100 mW to 10 kW with 20% over-range. Reads forward and reflected CW or FM power in watts or dBm, Peak Envelope Power or SSB/DSB and symmetrical AM in watts, and peak power for pulses as narrow as 0.8us Calculates SWR, return loss in dB and % modulation Stores peak and multi readings to facilitate adjustment of maximum and minimum signal levels Shock-resistant keyboard and range switches. RFI protection
  • Power Range: 100mW to 10kW using Bird Plug-in Elements
  • Frequency Range: 450 kHz to 2.7 GHz
  • Insertion VSWR: with N connectors 1.05 max to 1000 MHz
  • Power Readings: ±5% of full scale CW ±8% PEP
  • VSWR: 10% of reading
  • Modulation: (CW power 1/3 or more of full scale) ±5% (0-90%)   ±10% (90-100%)
  • Usable Over-range: to 120% of scale (CW, PEP, SWR and Return Loss)
  • Sampling Rate: 2 to 3 readings per second
  • Display: 3 1/2 digit, 0.3” LED strobed
  • Modulation Frequency: 25 to 10,000 Hz (audio)
  • Pulse Parameters: (min.) Pulse width 0.8us (100-2700 MHz) 1.5us (26-99 MHz) 15us (2-25 MHz) Repetition Rate 25 PPS, and Duty Factor 1 x 10-4min.
  • Return Loss: ±3% dB to corresponding SWR value
  • Type: Bench
  • Max. Frequency: 2700 MHz
  • Min. Frequency: 450 KHz
  • Max. power: 10 KW
  • Min. Power: 100 mW
  • Measure: Forward and reflected peak power SWR