Coded Transmitters
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ACT Avian Coded Tags


  • Wilson’s Snipe

    Simultaneous monitoring of your Birds & Bats with coded radio tags from 1.1g

    Why use coded radio tags?

    Coded radio tags send codes rather than simple beeps, meaning that hundreds of tags can share the same frequency but still be individually distinguished by their codes. For datalogging studies this avoids the need to scan through individual frequencies in turn (as with traditional beeper radio tags), reducing the chance of missing a detection by the receiver listening on the wrong frequency when an animal is present. Having multiple tags on the same frequency also means that more frequencies are available for other researchers, reducing congestion at busy study sites.

  • Theoretical bird migrations detected on the Motus array


    • Hundreds of transmitters on a single frequency
    • Individually identifiable codes
    • Delayed start and advanced scheduling available
    • Strong, flexible, non-kinking antenna
    • Magnet activation and deactivation
    • Compatible with any SRX receiver configured for coded tags

    Continental Scale Coded Radio Tracking

    The Motus Wildlife Tracking System (Motus) is a coordinated collaborative research network that uses coded tags to track wildlife movements at local, regional, and even hemispheric scales. For more information see

  • Eastern Bluebird

    Coded radio tag applications

    Flyway Studies - automated logging of birds or bats flying through area

    Migration Stopover Ecology - record when your tagged animals are present

    Colony Nesting Studies - log all parental feeding visits automatically

    Flight Searches - save time while searching by only listening to one frequency

    Bat Roost Behaviour - detect Bats leaving and returning to a roost

  • Provisional Specifications

    ACT - Low Profile Design
    Model Length (mm) Width (mm) Height (mm) Weight (g) *
    ACT-521 21 7.5 6.5 1.2
    ACT-626 22 7.5 7.0 1.5

    ACT - Compact Design
    Model Length (mm) Width (mm) Height (mm) Weight (g) *
    ACT-521 16 8.5 7.5 1.1
    ACT-626 16 8.5 7.5 1.3
    ACT-393 17 9.0 10 3.1

    * Weight estimate based on 18 cm ‘fine’ antenna and lightweight coating for all models.
    For 22 cm 'heavy duty' antenna, add 0.4g weight and 2mm length. Harness tubes will also add weight and length.
    Please contact one of our Avian Telemetry Specialist for more details.

    Estimated Lifespan in days
    Model (both designs) Burst Interval (s)
    4 7 10 13
    ACT-521 50 80 100 120
    ACT-626 100 160 200 240
    ACT-393 260 410 540 640

    Notes on Estimated Lifespan
    The burst intervals and corresponding estimated life specified for the transmitters are provided for comparative purposes.
    Various burst rates are available, based upon application specific considerations and operational life requirements.
    Warranty is 80% of the estimated lifespan, effective from date of shipment.

Coded Transmitters
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