Telex TR825-A4M
UHF Radiocom Belt Pack with A4M Connections


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The TR825-A4M is a UHF two-channel binaural wireless synthesized transceiver with A4M headset connector. For use with the BTR-800. This beltpack allows you to listen to "Tech" in one ear and "Production" in the other. Features individual volume controls that allow for easy level adjustment, all metal cast magnesium case, LCD interface, stage announce activation, wireless talk around (ISO) activation, enhanced ClearScan technology, detachable antennas, and an auto-sensing headset connector that switches between electret and dynamic headset mics.


On/Off & Volume Control
Turns the beltpack power on and controls headset volume.

Wireless Talk Around (WTA)
When pressed, the user’s audio is disconnected from the wired intercom, auxiliary input/output and the base station’s local headset. Other beltpack users, on that audio channel, can hear the user as normal.

Stage Announce
When pressed, the user’s audio is routed to the SA (Stage Announce) connector on the back of the base station. The user also loses their sidetone as an indication that stage announce is activated. The other wireless beltpacks and wired users do not hear the user’s audio. The button is nonlatching and activates the nearby red LED.

Audio Channel Select Button
Allows user to select either audio channel A or B.

Bat/Overmod Light (BAT/OM)
Light flashes once when unit is turned on if the battery is good. If the light stays on, battery is low. If the light does not flash, battery is dead. A normal microphone gain setting causes the LED to flash at the beginning of most words at normal speech levels. If the gain is too high, the LED is red during the complete word at normal speech levels.

Talk Light
LED is on when the talk button, SA or WTA is active.

Talk Button
The TALK LED, turns red when enabled. A quick press and release latches the talk function, unless latching has been disabled. Holding the button for over half a second causes the audio path to be enabled only for as long as the button is held. If the talk function is latched on, pressing the talk button again turns it off.


  • RF Frequency Range: 470–608MHz, 614–698MHz (614–722MHz, Europe) in 18MHz TX and RX bands
  • Power Requirements: 6 AA Cells Alkaline (NiMH optional)
  • TR-825 Current Draw: 190mA (Push-to-Talk A and B Talk On)
  • Temperature Range: -4°F to 130°F (-20°C to 55°C)
  • TX Antenna: 1/4Wave (supplied) Screw type, Replaceable
  • RX Antenna: 1/4 Wave (supplied) Screw type, Replaceable
  • Frequency Response: 300Hz–8kHz
  • Microphone Input Sensitivity: 7mV
  • Local Headset Output: 40mW output into 600W (1% distortion)
  • Transmitter Type: Synthesized, 712 channels
  • Transmit Power: 50mW Max. (Auto-power reduction)
  • Modulation Type: FM
  • Deviation: 40kHz (35kHz Europe)
  • RF Frequency Stability: 0.005%
  • Modulation Limiter: Peak-Responding Compressor
  • Radiated Harmonics & Spurious: Complies with FCC specifications
  • Receiver Type: Dual Conversion Super heterodyne, Synthesized, FM 712 channels
  • RF Sensitivity: <0.7µV for 12dB SINAD
  • Squelch Threshold: 20dB SINAD (About 1.0µV)
  • IF Selectivity: 3dB at 230kHz
  • Image Rejection: 70dB or better
  • Squelch Quieting: 90dB
  • RF Frequency Stability: 0.005%
  • Distortion: <1% at full deviation
  • Product Dimensions/Weight
  • TR-825: 3.75” W x 5.35” H x 2.02” D (9.5cm x 13.5cm x 5.1cm) 21oz (595g) with alkaline batteries

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