The TRXFB3 is a wide-band transmitter that transmits UHF audio and receives an IFB audio signal over ZaxNet (2.4GHz) at the same time. Basically, it’s a transmitter and IFB audio receiver built into one bodypack.

It’s lightweight and durable, housed in a high-strength, impact-resistant nylon polymer casing.  There’s also a pushbutton 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 we can most likely program the key to meet your specific needs.


The FB3 has a 3-pin micro LEMO connector that supports 3.3-volt lavalier microphones, and a 3.5mm jack to support the earpiece.


The TRXFB3 transmits and receives a 100% digital modulation so both audio feeds are fully encrypted. Digital encryption is the only way to keep all audio transmission private. A digital transmission also provides audio quality superior to analog systems.


NeverClip™ is a standard feature of the FB3. It works by utilizing two A-D converters to extend the dynamic range of the transmitter to 126 dB, so there’s never any limiter distortion.


Audio is simultaneously transmitted and recorded to a removable microSD card using the highly reliable MARF (Mobile Audio Recording Format) which eliminates file corruption common to recordings due to a dead battery or early card removal.


FB3 is equipped with ZaxNet™, a long-range remote-control system allowing the user to change the frequency, pre-amp gain, sleep mode, and place the internal recorder in record, playback, and stop modes – all without ever needing to disturb talent.


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 range will always vary depending on your environment, but you’ve got choices to optimize transmission for peak performance. Zaxcom High Density modulation (ZHD) increases the number of available channels from 4 to 9 for every 1 MHz of spectrum space, perfect for reflective environments like busy city streets. XR gives you the maximum distance in less dense / more controlled spaces.


The TRXFB3 runs for up to 7 hours on two AA lithium batteries. Runtime varies on rechargeables.


FB3 is available in the following frequency bands:
“.5 band” (512-608 MHz)
“.6 band” (578-698 MHz) (not available in the U.S.)

Zaxcom Digital Recording Wireless Transmitters are protected under patent #’s: 7,711,443, 7,929,902, 9,094,636 B1, 8,835,814 B2 & 8,842,854

•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
Transmitter Audio
Dynamic Range
126 dB
Frequency Response
Mode 0
High Pass Filter
Off or 30 to 220 Hz, Steps
Mic Power
3.3 VDC
Mic Connector
3-Pin Micro LEMO
Input Range
-60 to -30 dBu
Mic Impedance
6.8 k Ω
Timecode Reader / Generator
Clock Accuracy
1.54 PPM (1 Frame Out in 6 Hours)
Timecode Type
Timecode Frame-Rates
23.98, 24, 25, 29.97NDF, 29.97DF, 30NDF, 30DF
Internal Recording
MicroSD Card (Flash Memory)
File Format
Recording Time
Up to 216 hours on a 16GB card (using XD or ZHD modulation)
2.4 GHz ZaxNet Receiver
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
-96 dBm
Receiver Audio
System Group Delay
10 ms
Dynamic Range
96 dB
Frequency Response
60 Hz to 12 kHz
Output Connector
1/8” Stereo (3.5 mm)
Compatible HP Impedance
32 to 200 ohms
3.7 oz without Battery
Dimensions (H x W x D)
3.5″ x 2.4″ x .65″
Graphic OLED
Power Output
25 / 50 / 100 mW – Software Selectable
Battery Life
Up to 7 Hours with 2 Lithium AA at 100mW

Zaxcom - TRXFB3

  • Brand: Zaxcom
  • Product Code: TRXFB3
  • $2,450.00

Available Options

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