Zaxcom ZMT4 Miniature Transmitter

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Overview
Specifications

Design Matters

The ZMT4 has taken digital recording wireless to the next level with 30% better power consumption, NeverClip in all modes, power for all microphones - from a 5V lavalier to a 48V phantom powered mic, and a new ultra-low noise preamp.

Deliver pristine audio quality with Zaxcom's ZMT4, an incredibly small, lightweight, talent-friendly transmitter ideal for sound professionals. Weighing only 62g, the ZMT4 is constructed from a high-strength, impact-resistant nylon polymer casing with rounded edges and machined metal that's cool to the touch.

Microphone Connectivity

The ZMT4 has a wide range of power to cover nearly any professional analog microphone - 5V lavalier mics as well as condenser, balanced dynamic, or ribbon microphones running at 12, 24, 36 or 48V.

Perfect for boom pole operation, the ZMT4 can be positioned at the top of a boom pole directly behind the microphone instead of near the bottom. By removing the internal or external cable, operators can eliminate cable noise that can affect the audio track. Boom microphone connectivity is via a 3-pin balanced LEMO.

Encrypted Audio

The ZMT4 transmits using 100% digital modulation allowing audio to be 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.

Adaptive Antenna Optimisation

This new feature in the ZMT4 improves radiation of the bodypack’s antenna when it’s placed in contact or near the human body. Normally, putting a bodypack on talent decreases transmission range because the body absorbs some of the signal. With adaptive antenna optimisation, the external antenna is actively matched to its condition to optimise radiation and minimise distortion, keeping the signal at its best.

Microphone Preamp

The ZMT4 features an all-new preamp design. The noise content of the preamp and A-D combination now utilises NeverClip with both lav and balanced boom mics, making the environment and self-noise of the microphone the dominant noise components.

NeverClip

NeverClip is available in all modes on the ZMT4. It works by utilising two A-D converters to extend the dynamic range of the transmitter to 136 dB, so there’s never any limiter distortion.

Internal Recording

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.

ZaxNet

ZMT4 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.

PowerRoll

To extend battery life, PowerRoll adjusts the ZMT4’s power level to 50mW when the audio received from it is being recorded by a ZaxNet compatible recorder. When the transmitter audio isn’t being recorded the power is automatically reduced to 10mW.

Modulation Choices for your Environment

The range will always vary depending on your environment, but you’ve got choices to optimise transmissPower

The ZMT4 has up to 30% better battery life than its predecessor. A single NP-50 battery provides up to 6 hours of runtime with a lavalier running at 5v and up to 4.5 hours of runtime while using a 12-48v boom microphone.

Specifications

Transmitter

RF Modulation	Proprietary Digital Method
ZMT4.5 RF Frequency Range	512 - 608 MHz
ZMT4.6 RF Frequency Range	578 - 698 MHz
RF Frequency Step	100 KHz
RF Bandwidth in ZHD96 Mode	100 KHz
RF Bandwidth in XR Mode	200 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
FCC Part	74.861

Transmitter Audio

Dynamic Range	136 dB
Distortion	0.01%
Frequency Response	Mode 0 20 Hz to 16 kHz / T & M Mode 0.2 Hz to 16 kHz
High Pass Filter	Off or 70 to 220 Hz, Steps, 10 (6dB Per Octave)
Unbalanced Lavaliere Mic Power	5.0v @ 10mA max
Balanced Mic Power	12v @ 25mA max
Balanced Mic Power	24v @ 10mA max
Balanced Mic Power	36v @ 10mA max
Balanced Mic Power	45v @ 10mA max
Mic Connector	3-Pin Micro LEMO
Mic Configuration	Balanced (3-wire) / Unbalanced (2-wire)
Input Range	-60 to -30 dBu
Mic Impedance	3.4 k Ω (680 Ω with 12v power mode)
ADC Bit-Depth	32 Bits
ADC Sampling-Rate	32 kHz

Timecode Reader / Generator

Clock Accuracy	1.54 PPM (1 Frame 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

Physical

Weight	2.2 oz / 62 grams with Battery
Dimensions (H x W x D)	2.2″ x 1.6″ x .55″ / 55.8mm x 40.6mm x 14mm
Display	Graphic OLED

Power

Power Output	10 / 50 mW – Software Selectable
Power Consumption	125 mA @ 4.2v with 50mW TX (no ZaxNet or Phantom pwr)
Battery Type	NP-50
Lavalier Battery Life	Up to 6 hours
Phantom Power Battery Life	Up to 4.5 hours