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Zaxcom ZMT3.5-Flex Wireless Transmitter

This listing is for the ZMT3.5-Flex, which covers the band 512-614 MHz
A tough wireless transmitter designed for tough demands. Deliver pristine audio quality with the ZMT3-Flex, a bendable wireless transmitter designed to capture the on field experience of professional sports.

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Design Matters

A tough wireless designed for tough demands. Deliver pristine audio quality with the ZMT3-Flex, a bendable wireless transmitter designed to capture the on field experience of professional sports.

Weighing only 3 oz (85 g), the ZMT3-Flex is constructed from a soft yet durable silicon rubber that allows the transmitter to bend and flex, providing an elevated level of safety for the professional sports player.

Microphone Connectivity

The ZMT3-Flex works with either a single mono or dual lavalier microphones in stereo via two microdot input connectors.

Encrypted Audio

The ZMT3-Flex transmits using 100% digital modulation resulting in audio that’s fully encrypted. Digital encryption is the only way to keep audio transmissions private. The system uses one of 16 million encryption codes for an unbreachable level of privacy.

Internal Recording

Audio can be simultaneously recorded internally to a microSD card using the highly reliable lossless MARF (Mobile Audio Recording Format) which eliminates file corruption common to recordings due to dead battery or early card removal.

Better Workflow

The ZMT3-Flex provides a 128 dB dynamic range in mono and 108 dB in stereo with no limiting or compression distortion. External audio and battery status levels are seen on the OLED or at the Zaxcom receiver.

Advanced Features

ZaxNet™ allows for remote changes in the channel, pre-amp gain, output power or to be placed in record, playback and stop modes without removing the transmitter from the talent.

Zaxcom High Density modulation or ZHD for short increases the number of available channels in one MHz of spectrum space.

MHZ Bands

ZMT3-Flex is available in the following frequency bands:
".5 band" (512-614 MHz)
".6 band" (596-698 MHz) (Outside the U.S.)



RF Modulation Proprietary Digital Method
ZMT3.5-Flex RF Frequency Range 512 - 614 MHz
RF Frequency Step 100 KHz
RF Bandwidth in ZHD48 Mode 50 KHz
RF Bandwidth in ZHD96 Mode 100 KHz 
RF Bandwidth in XR Mode 200 KHz
Channel Separation in ZHD48 Mode as close as 100 KHz 
Channel Separation in ZHD96 Mode as close as 200 KHz
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

Transmitter Audio

Dynamic Range Mono Mode 128 dB
Dynamic Range Stereo Mode 108 dB  
Distortion 0.00%
Frequency Response Mode 0
High Pass Filter Off or 30 to 220 Hz, Steps
Mic Power 3.3 VDC
Mic Connector two microdot
Input Range -60 to -30 dBu
Mic Impedance 6.8 k Ω
ADC Bit-Depth 24 Bits
ADC Sampling-Rate 48 kHz

Timecode Reader / Generator

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

Internal Recording

Media MicroSD Card (Flash Memory)
File Format .ZAX / Converts to BWAV or MP3

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
Sensitivity -96 dBm


Weight 3 oz / 85 grams with Battery
Dimensions (H x W x D) 4.8" x 1.7" x .4″ 
Display Graphic OLED


Power Output 25 / 50 / 75 mW – Software Selectable
Battery Type Li Ion 1300mAH
Battery Life Up to 6 Hours with 24 Hours of Standby