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Zaxcom - TRXFB3

Zaxcom - TRXFB3
Zaxcom - TRXFB3 Zaxcom - TRXFB3 Zaxcom - TRXFB3
Product Code: TRXFB3

Available Options

* Zaxcom Blocks .5 or .6:

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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 we 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.

You might be wondering what makes this unit special... It’s a reincarnation of a feature we 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 we 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 transmission and spacing...

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

TRXT3.5 RF Frequency Range

512 - 614 MHz

TRXT3.6 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 Bandwidthin 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 (Stereo model 106 dB)



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


Timecode Reader / Generator

Clock Accuracy

1.54PPM (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

96 Hours (16 GB card)

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



Weight: 3.1 oz with Battery

Dimensions (H x W x D)

2.4x 2.4x .65


Graphic OLED


Power Output

25 / 50 mW Software Selectable

Battery Life

Up to 5 Hours with 1 Lithium AA


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