RTS BP-351/A4F
2-Channel Portable Beltpack in Black with A4F Headphone Connector


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List Price: $420.00
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RTS' BP-351 is a portable user station for use with RTS™ Two-Wire intercom systems.  The BP-351 is a microprocessor controlled two-channel select intercom belt pack. The BP-351 has a connection for headset/earset microphones (Dynamic or Electret).  The factory setting is for Dynamic.


  • Call function that allows the user to send or receive call signals to other devices on the intercom channel, including audible call alert on the listen side.
  • Microprocessor-controlled microphone kill detect.
  • Powered externally, via the intercom system power supply on channel one.
  • Headset 4-pin XLR connection
  • A built-in auto-sensing headset connector determines automatically whether a dynamic or electret headset is connected to the system.


  • Channel Supplied Power Requirements: 30 VDC nominal (standard RTS line), 45 to 70 mA
  • Environmental Requirements:
    Storage: -20°C to 80°C; 0% to 95% humidity, noncondensing
    Operating: 0°C to 50°C; 0% to 95% humidity, noncondensing
  • Dimensions: 5" (127 mm) high, 3.5" (88.9 mm) wide, 1.8" (45.7 mm) deep
  • Weight: Approximately 13 oz (364 g)

Interface Requirements:

  • Headset/Earset:
    50 to 200 ohm dynamic microphone
    50 to 600 ohm headphones
  • RTS Intercom Channel:
    Output Level: 0.775 Vrms (0 dBu) nominal
    Bridging Impedance: greater than 10,000 ohms
  • Call Signalling:
    Send: 20 kHz ±100 Hz, 240 mVrms ±10%
    Receive: 20 kHz ±800 Hz, 100 mVrms
    Mic-Off Frequency Detect: 24 kHz ±800 Hz, 100 mVrms
    Noise Contribution: less than -60 dB on the line

Headphone Amplifier:

  • Maximum Output: 60 mW into 150 ohms
  • Frequency Response: 200 Hz to 8 kHz +1/-4dB nominal
  • Audible Alert: 1 kHz tone
  • Total Harmonic Distortion: Less than 0.2% nominal at 50 mW from the line
  • Sidetone: 20 dB minimum range, adjustable

Connector Pin Configurations:

  • Intercom Channel Connector
    Pin 1 Headset Microphone low
    Pin 2 Headset Microphone high
    Pin 3 Headphone Common
    Pin 4 Headphone Chan 1 or Chan 1 and Chan 2 audio
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