Zaxcom TRXFB3.6 Zaxnet Wireless Transceiver with IFB (Blocks 23-26 - 596-698 MHz)


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  • The TRXFB3 is a wide-band transmitter featuring the new Zaxcom High Density (ZHD) Modulation. It’s packed full of features invented to make your life on set the best it can be – built-in recording with timecode, ZaxNet remote control – so there’s never a need to get near talent – and crystal clear 100% digital transmission that rivals a hard wire.


    • 100% digital modulation for superior audio quality
    • Encrypted Audio keeps transmitted audio private
    • Intermodulation Resistant removes unwanted spurious emissions for a cleaner signal
    • Internal Backup Recording captures quality back-up audio even in the most hostile RF environment
    • Internal Recording records timecoded audio files
    • MARF highly reliable lossless recording format
    • Neverclip gives you an incredible dynamic range without clipping your audio
    • Built-in timecode reader and generator
    • Zaxnet provides wireless timecode, ZaxNet audio and remote control between Zaxcom products
    • ZaxNet QC Audio quality control confidence monitoring without returning to your cart
    • ZHD Modulation a 50 KHz wide signal spaced as close as 100 KHz apart with outstanding transmission distance

    You might be wondering what makes this unit special… It’s a reincarnation of a feature Zaxcom had to bring back by popular demand. This single body pack transmits audio via UHF and receives an IFB audio feed received over ZaxNet’s 2.4 GHz signal at the same time. It replaces the need for talent to wear both a wireless microphone pack and an IFB receiver.

    There’s also a key at the top of the transceiver that’s user programmable. Currently it can be assigned as a push to mute or a push to talk key. If you’d like it to be something else, just call the factory and they can most likely program the key to meet your specific needs.

    The TRXFB3.5 covers blocks 20 through 23 (512-614MHz) and the TRXFB3.6 covers blocks 23 through 26 (596 – 698 MHz). It’s lightweight and durable, housed in a high strength, impact resistant nylon polymer casing. The FB3 has NeverClip™ for an incredible dynamic range and also utilizes Zaxcom’s battery saving feature PowerRoll™. PowerRoll™ automatically adjusts the transmitter output power based on the record status as sent via ZaxNet boosting the output power level up to 100 mW while rolling and powering down to 50 mW while on standby.

    The FB3 works with ZaxNet, Zaxcom’s 2.4-GHz RF network that distributes remote control commands, timecode and IFB audio. With ZaxNet, one can remotely control transmitter settings such as gain, frequency channel selection, transport controls and output power levels. When paired with an IFB100/200 and Deva or Fusion the units can also replay audio via a timecode reference giving production sound mixers the ability to replay and remix audio, creating a virtual multi-track playback and re-record system.

    The FB3 also sends a Quality Control audio signal over ZaxNet so when micing someone you don’t have to go to the cart to hear how it sounds. Now you can use an ERX to listen to the mic right on the spot.

    ZHD Modulation allows up to 10 channels of wireless to be operated in only 1 MHz of spectrum space. Channel spacing will vary based on the receiver you pair it with. The wireless signal is only 50 KHz wide and can be spaced as close as 100 KHz channel to channel allowing up to sixty channels of ZHD wireless in a single 6 MHz American television channel. The new modulation is ultra efficient resulting in incredible transmission range.

    The ZHD transmitters are capable of running existing mono Zaxcom modulations maintaining compatibility with all currently produced Zaxcom receivers. ZHD modulation conforms to all currently proposed FCC regulations for spectrally efficient wireless transmission.

    • The FB3 paired with any Zaxcom wireless receivers in Mono or XR Modes can be spaced as close as 400 KHz channel to channel
    • The FB3 paired with any Zaxcom QRX235, QRX200 or QRX212 in ZHD 96 mode can used in dual mode and be spaced as close as 400 KHz channel to channel
    • The FB3 paired with any Zaxcom QRX235, QRX200 or QRX212 in ZHD 48 mode can used in single mode and be spaced as close as 200 KHz channel to channel (300 KHz recommended)
    RF Modulation Proprietary Digital Method
    TRXLA3.5 RF Frequency Range 512 - 614 MHz
    TRXLA3.6 RF Frequency Range 596 - 698 MHz
    RF Frequency Step 100 KHz
    RF Bandwidth in ZHD 48 Mode 50 KHz
    RF Bandwidth in ZHD 96 Mode 100 KHz
    RF Bandwidth in XR Mode 200 KHz
    Channel Separation in ZHD 48 Mode as close as 100 KHz (receiver dependent)
    Channel Separation in ZHD 96 Mode as close as 200 KHz (receiver dependent)
    Channel Separation in XR Mode 400 KHz
    Antenna Connector 50 Ω SSMA Female
    Emission Designator 180 KV2E, 100 KV2E, 50 KV2E
    FCC Part 74.861
    Dynamic Range 126 dB (Stereo model 106 dB)
    Distortion 0.002%
    Frequency Response Mode 0: 20 Hz to 16 kHz / T & M Mode 0.2 Hz to 16 kHz
    High Pass Filter Off or 30 to 220 Hz, Steps: 10 (6 dB Per Octave)
    Mic Power 3.3 VDC
    Mic Connector 3-Pin Micro LEMO
    Input Range -60 to -30 dBu
    Mic Impedance 6.8 k Ω
    Clock Accuracy 1.54 PPM (1 Frame Out in 6 Hours)
    Timecode Type SMPTE
    Timecode Frame-Rates 23.98, 24, 25, 29.97NDF, 29.97DF, 30NDF, 30DF
    Media MicroSD Card (Flash Memory)
    File Format .ZAX
    Recording Time Up to 216 hours on a 16GB card (using XD or ZHD modulation)
    RF Frequency Range 2.403 to 2.475 GHz
    RF Modulation Digital Spread Spectrum
    RF Frequency Step 0.001 GHz (1 MHz)
    RF Bandwidth 1 MHz
    Channel Separation 2 MHz
    Sensitivity -96 dBm
    System Group Delay 10 ms
    Dynamic Range 96 dB
    Distortion 0.01%
    Frequency Response 60 Hz to 12 kHz
    Output Connector 1/8” Stereo (3.5 mm)
    Compatible HP Impedance 32 to 200 ohms
    Weight 3.7 oz without Battery
    Dimensions (H x W x D) 3.5″ x 2.4″ x .65″
    Display Graphic OLED
    Power Output 25 / 50 / 100 mW – Software Selectable
    Battery Life Up to 7 Hours with 2 Lithium AA at 100mW
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