Zaxcom ZMT4 User manual

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USER MANUAL
Published April 2021
Firmware Version ZMT-402
ZMT4
Light and Versatile

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ZMT4 TRANSMITTER ..................................................................................................................................... 4
HOME SCREEN .............................................................................................................................................. 6
MAIN MENU ................................................................................................................................................. 7
MICROPHONE GAIN SET ................................................................................................................................................................7
UHF TRANSMIT FREQUENCY SET.....................................................................................................................................................7
PHANTOM POWER........................................................................................................................................................................7
TRANSMITTER LOCK PAGE ..............................................................................................................................................................7
SUB MENUS .................................................................................................................................................. 9
MENU GROUPS ............................................................................................................................................................................9
ACCESSING AND NAVIGATING THE MENU GROUPS ...............................................................................................................................9
ENTERING AND NAVIGATING A SUB MENU..........................................................................................................................................9
EXITING THE EXTENDED MENU.........................................................................................................................................................9
TIME CODE MENU........................................................................................................................................10
TIME CODE FRAME RATE SET........................................................................................................................................................10
TIME CODE SOURCE SELECT..........................................................................................................................................................10
TC JAM MODE SELECT ................................................................................................................................................................10
MUTE TIME CODE TRANSMISSION UNTIL JAMMED ...........................................................................................................................10
AUTO FRAME RATE ENABLE..........................................................................................................................................................11
TRANSMIT MENU.........................................................................................................................................12
UHF TRANSMITTER POWER LEVEL SET ...........................................................................................................................................12
UHFTRANSMIT MODULATION SET................................................................................................................................................12
TRANSMITTER DISABLE -RECORD ONLY MODE..................................................................................................................................12
RECORD MENU ............................................................................................................................................13
SD CARD FORMAT ......................................................................................................................................................................13
PLAYBACK CONTROL....................................................................................................................................................................13
TIME LEFT ON CARD....................................................................................................................................................................14
AUTOMATIC RECORD AFTER BOOT UP.............................................................................................................................................14
LOW BATTERY STOP SET ..............................................................................................................................................................14
ZAXNET MENU.............................................................................................................................................15
ZAXNET MODE ..........................................................................................................................................................................15
ZAXNET RECEIVE FREQUENCY SET..................................................................................................................................................15
ZAXNET TRANSMIT FREQUENCY SET...............................................................................................................................................15
GROUP CODE SET.......................................................................................................................................................................16
UNIT CODE SET ..........................................................................................................................................................................16
ZAXNET VOTING ENABLE .............................................................................................................................................................16
ZAXNET RECEIVE BEFORE TRANSMIT TIME ......................................................................................................................................17
IFB RECEIVE PULSE SET ...............................................................................................................................................................18
RECORD BEEP SET.......................................................................................................................................................................18
AUDIO MENU...............................................................................................................................................19
HIGH PASS FILTER.......................................................................................................................................................................19
2K NOTCH FILTER.......................................................................................................................................................................19
DYNAMICS ................................................................................................................................................................................20

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SETUP MENU ...............................................................................................................................................21
PHANTOM POWER......................................................................................................................................................................21
TEST TONE ................................................................................................................................................................................21
KEY LOCK ON BOOT UP...............................................................................................................................................................21
QRX /ERX FIRMWARE UPDATE ...................................................................................................................................................22
OLED BRIGHTNESS ADJUST..........................................................................................................................................................22
OLED DISPLAY DIM....................................................................................................................................................................22
INFORMATION PAGE ...................................................................................................................................................................22
HIDE ENCRYPTION MENU.............................................................................................................................................................22
ENCRYPTION CODE SET................................................................................................................................................................23
HIDE TRANSMITTER NAME MENU .................................................................................................................................................23
TRANSMITTER NAME SET .............................................................................................................................................................23
RECORDING FORMAT ..................................................................................................................................................................24
FIRMWARE ..................................................................................................................................................25
UPDATING THE ZMT4 FIRMWARE..................................................................................................................................................25
UPDATING ERX FIRMWARE WITH A ZMT4 TRANSMITTER...................................................................................................................25
WIRING DIAGRAMS......................................................................................................................................26
TWO WIRE LAVALIER MICROPHONE CONFIGURATION .......................................................................................................................26
THREE WIRE LAVALIER MICROPHONE CONFIGURATION......................................................................................................................26
MICROPHONE INPUT CONFIGURATION............................................................................................................................................26
OPERATING FREQUENCIES............................................................................................................................27
ZAXNET -REMOTE CONTROL AND TIME CODE .................................................................................................................................27
UHF -AUDIO ............................................................................................................................................................................27
PRODUCT SUPPORT .....................................................................................................................................29
SPECIFICATIONS...........................................................................................................................................30
ZAXCOM WARRANTY POLICY AND LIMITATIONS...........................................................................................31

Zaxcom ZMT4 Transmitter
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ZMT4 Transmitter
1. Card / Power Key
•Push and hold for 2 seconds to power on.
•Push and hold 3 seconds followed by a quick press of the MENU key to power off.
•Press 3 times quickly to access the sub menus.
•Press 3 times quickly to return to the home screen.
2. OLED Display
3. Menu / Play Key
•Press it to access the next menu item.
•Press it with the CARD key to playback a segment.
4. INC / Record Key
•Increases the parameters of a menu item.
•When in the home screen pressing INC with the CARD key will put the transmitter into record.
•When in the transport control screen while not recording will cause the transmitter to playback.
•Pressing while playing back will advance playback, multiple presses will cause playback to advance in
larger increments.
•Press and hold while in the transport control screen will advance to the next segment.
•Press it while in the home screen will display the group and unit code and the time left on the card.
5. DEC / Stop Key
•Decreases the parameters of the menu items.
•When in the home screen pressing DEC with the CARD key will stop the recording.
•When playing back in the transport control screen will cause the transmitter to stop playback.
•Press and hold while in the transport control screen will jump back to the previous segment.
•Pressing it three times quickly while in the home screen will access the sub menu.
6. Microphone Connector (3 pin Lemo)
7. SSMA Antenna Connector
7
3
1 2
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4 5

Zaxcom ZMT4 Transmitter
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1. Micro SD Card Slot
Inserting a Micro SD card:
With the OLED screen of the transmitter facing you, turn the card so the finger contacts are facing
away towards the battery compartment and pointing down toward the slot. Insert the card into the
slot and press it down until you hear a slight click. To remove it, press the card in until you hear the
same click again.
2. Microphone Connector (3 pin Lemo)
Warning: Make sure the appropriate voltage is selected before plugging in a microphone.
3. SSMA Antenna Connection
4. Battery Compartment
ZMT4 uses 1 NP50 battery.
Warning: Batteries can vary in size which may cause some batteries to get caught on the gasket
when opening the battery door. If this happens DO NOT fully open the battery door or try to
reclose the door while the battery is stuck, as this can damage the power connector on the ZMT4
and will need to be sent in for service. If a battery gets caught please pull the battery off the door
first.
2 31
4

Zaxcom ZMT4 Home Screen
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Home Screen
Frequency - This is the transmit frequency of the ZMT4.
If the ZMT4 is being used in RECORD ONLY mode “NOTX” will be displayed.
ZaxNet Status
•IFB RX - The ZMT4 is receiving ZaxNet.
•IFB TX - The ZMT4 is transmitting ZaxNet.
Transport Status – Displays the current mode of the recording feature.
•STOP - Recording / Playback is stopped
•LREC - ZMT4 is recording in LOOP RECORD mode.
•REC - ZMT4 is recording in NON-LOOP RECORD mode.
•PLAY - ZMT4 is playing back a recorded audio file.
Power Level - Displays the transmit power level.
Battery - This displays the battery type and the approximate percentage of remaining battery power.
Audio Meter - Displays the modulation of the inputted audio signal.
SEG - Displays the number of recorded segments on the micro-SD card. Please note that regardless of
the size of the card it is limited to 500 segments.
Gain - “G” Appears when the transmitter is receiving change of gain commands via ZaxNet.
Group and Unit Code - Pressing the INC key while in the
home screen will display the group and unit code and the
record time remaining on the card.
Time Code and Frame Rate - Pressing the DEC key while in
the home screen will display the time code and frame rate of
the time code generator.
GROUP:1 UNIT:1
TIME LEFT 24H
ZaxNet Status Transport Power
Frequency Modulation Status Level
B
attery Level Audio Meter Gain
Indicators at -20, -10, 0 dBFS
543.2 STOP
5
LION ZHD96 SEG 001
G
TC: 09:18:05:00
23.98 (AUTO)

Zaxcom ZMT4 Main Menu
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Main Menu
To cycle through the main menu press the MENU key.
Microphone Gain Set
The microphone gain is adjusted from this menu. This menu displays the gain setting in decibels and a meter
indicating the audio signal. The meter is displayed horizontally from left to right.
UHF Transmit Frequency Set
This menu is where the UHF transmit frequency is set.
•Short presses of the INC or DEC key causes the value to change by 0.1 MHz
•Holding the INC or DEC key causes the value to change by 0.5 MHz
Phantom Power
This menu is where the phantom power is turned on and adjusted from. The ZMT4 has 6 user selectable power
options: When set to any voltage other than 5, the ZMT4 will input a balanced signal.
•OFF, 5V, 12V, 24V, 36V or 45V Phantom
WARNING - make sure the microphone attached to the transmitter is rated for the applied voltage before
engaging phantom power - not doing so can damage the microphone.
Transmitter Lock Page
This page enables a key lock function so no parameters can be changes. When the lock page is landed on
a countdown clock will begin. After 5 seconds the transmitter will lock, and the display will indicated that
it is LOCKED. If this screen is exited before the 5 seconds are up the transmitter will not lock. When the
transmitter is locked the OLED will turn off.
To lock the transmitter before the 5 seconds press and hold the DEC key.
Pressing the INC key when the transmitter is locked will display the ZMT4’s group and unit code, its
transmit frequency and serial number. Pressing the DEC key will display the units name, battery voltage
and current record segment number.
GAIN 20 dB
TXFREQ 543.2
Countdown clock starting at 5 seconds
After the transmitter locks
LOCKED 20 dB
09:18:05:02
23.98
LOCK 5
PHANTOM POWER:
OFF

Zaxcom ZMT4 Main Menu
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To unlock the transmitter
•Press and hold the MENU key and press INC keys 5 times.
Or
•Powering down and reboot the transmitter.

Zaxcom ZMT4 Menu Navigation
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Sub Menus
Menu groups
The ZMT4 has six sub menu groups
•Time Code - Changes the time code parameters of transmitter.
•Transmit - Changes the parameters of the UHF transmitter.
•Record - Changes the parameters of the on-board recorder.
•ZaxNet - Changes the parameters of the ZaxNet transceiver.
•Audio - Changes the parameters of the transmitted and recorded audio.
•Setup - Changes the parameters of the general operation on the transmitter.
Accessing and navigating the menu groups
From in the home screen press the CARD key three times, the DEC key three times, or hold the MENU key while
booting up, to access the six menu groups. Then pressing the INC or DEC key will cycle between the menu
items.
Entering and navigating a sub menu
When landing on the desired menu group press the MENU key to enter that menu.
To return to the top of the menu press the MENU key to cycle to the top or press and hold the MENU key for
1.5 seconds.
Exiting the extended menu
Press the CARD key 3 times or press the MENU key to cycle through the sub menu items until HOME MENU is
displayed then press the MENU key.

Zaxcom ZMT4 Time Code Menu
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TIME CODE MENU
Time Code Frame Rate Set
The time code frame rate menu is where the time code frame rate is set.
The ZMT4 will lock to and record all standard time code frame rates.
•23.98, 24, 25, 29.97DF, 29.97DF, 30 DF, 30 NDF
Time Code Source Select
The time code source menu selects how the transmitter will receive its time code.
•ZAXNET (RF) - The ZMT4 will receive time code via ZaxNet
•AUDIO INPUT - The ZMT4, with a proper cable, will receive time code via the microphone input.
When time code is connected, it takes the transmitter approximately three seconds to recognize the TC.
The screen will display TIME CODE followed by JAM when it is recognized. Please note that when using the
microphone input connector, the audio level of the time code signal needs to be between -30 and -10 dBFS
on the unit’s meter. Any level above -10 may cause clipping, which will prevent proper reading of time
code.
TC Jam Mode Select
This menu controls if the ZMT4 will go into record when it receives a record run time code.
•AUTO-JAM NORMAL - The ZMT4 will continuously jam time code via ZaxNet and will go into record when
receiving a record command via ZaxNet or if the unit is put into record manually by pressing the CARD and
INC keys simultaneously.
•AUTO-LOAD REC RUN - In Auto-Load mode the ZMT4 will go into record when it detects rolling time code
and will stop when the time code stops. If time code is lost because the IFB signal is too weak the unit will
not stop but will continue in whatever state it was in until the time code signal is restored.
Mute Time Code Transmission Until Jammed
If the mute time code menu is set to ON the ZaxNet transmitter will not broadcast time code over ZaxNet
until the transmitter receives time code and jams its own internal time code generator. This prevents the
ZaxNet from sending incorrect time code to another device.
TIMECODE 23.98
GEN 09:18:05:02
TC SOURCE:
ZAXNET (RF)
TC JAM MODE:
AUTO-JAM NORMAL
MUTE TC SEND
UNTIL JAMED: OFF