Zaxcom TRX 743 Plug-On Transmitter

Zaxcom TRX 743 Plug-On Transmitter
Zaxcom TRX 743 Plug-On TransmitterZaxcom TRX 743 Plug-On TransmitterZaxcom TRX 743 Plug-On TransmitterZaxcom TRX 743 Plug-On Transmitter

Cone Choices

Mono Analog: 3-Pin XLR
Stereo Analog: 5-Pin XLR
AES (not powered): 3-Pin XLR
AES42 (powered) 3-Pin XLR

Zaxcom TRX 743 Plug-On Transmitter

Clutter free with ZHD
Ultra small spectral footprint of 50kHz that can be spaced as close together as 100KHz

Change it up
The TRX743 has interchangeable input cones giving you the ultimate in flexibility. You can connect any microphone to the 743.

Bells & Whistles
Wide-band transmitter with built-in recording that's RF remote controllable - what more could you ask for?


  • Digital Modulation: 100% Digital modulation for superior audio quality
  • Encrypted Audio: Keeps transmitted audio private
  • Intermodulation Resistant: Removes unwanted spurious emissions for a cleaner signal
  • Internal Backup Recording: Capture quality back-up audio even in the most hostile RF environment
  • Internal Recording: Records timecoded audio files
  • MARF: Highly reliable lossless recording format
  • Neverclip: Gives you an incredible dynamic range without clipping your audio
  • Timecode: Built-in timecode reader and generator
  • Zaxnet: Provides wireless timecode, ZaxNet audio and remote control between Zaxcom products
  • ZaxNet QC Audio: Quality control confidence monitoring without returning to your cart
  • ZHD Modulation: A 50 KHz wide signal spaced as close as 100 KHz apart with outstanding transmission distance

Product Description

The TRX743 is a wide-band plug-on style digital wireless microphone with interchangeable cones to support all professional microphone varieties – mono analog, stereo analog, AES and AES42 – making it an ideal choice for wireless transmission directly from boom poles or handheld microphones. The TRX743 features the new Zaxcom High Density (ZHD) Modulation. 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 all 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.

A bit about spacing…

  • The TRX743 paired with any Zaxcom wireless receivers in Mono or XR Modes can be spaced as close as 400 KHz channel to channel
  • The TRX743 paired with any Zaxcom QRX235, QRX200 or QRX212 in ZHD mode can be spaced as close as 200 KHz channel to channel (300 KHz recommended)
  • The TRX743 paired with the upcoming QRX335, QRX300 or QRX312 in ZHD mode can be spaced as close as 100 KHz channel to channel

The TRX743.5 covers blocks 20 through 23 (512-614MHz) and the TRX743.6 covers blocks 23 through 26 (596 – 698 MHz). Its body is constructed from a combination of high strength nylon polymer and aluminum. The 743 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 25 mW while on standby.

The 743 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 TRX743 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.

The TRX743’s cones are easily swapped in the field for ultimate flexibility. It comes standard with the cone of your choice, extra cones can be purchased as accessories.

Cone choices:

  • Mono Analog – 3-Pin XLR
  • Stereo Analog – 5-Pin XLR
  • AES (not powered) – 3-Pin XLR
  • AES42 (powered) – 3-Pin XLR



RF Modulation Proprietary Digital Method
TRX743.5 RF Frequency Range 512 - 614 MHz
TRX743.6 RF Frequency Range 596 - 698 MHz
RF Frequency Step 100 KHz
RF Bandwidth in ZHD Mode 50 KHz
RF Bandwidth in XR Mode 200 KHz
Channel Separation in ZHD Mode as close as 100 KHz (receiver dependent)
Channel Separation in XR Mode 400 KHz
Antenna Connector 50 Ω SMA Female
Emission Designator 180 KV2E, 100 KV2E, 50 KV2E
FCC Part 74.861

Transmitter Audio

Dynamic Range 126 dB (Stereo model 106 dB)
Distortion 0.002%
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 Connector 3-Pin or 5-Pin XLR
Analog Mic Power 48 V Phantom (10 mA max)
Digital Mic Power 10 V AES42 compatible (200 mA max)
Input Range -60 to -30 dBu
Mic Impedance 4.7 k Ω
ADC Bit-Depth 24 Bits
Audio Interfaces Balanced analog mono, balanced stereo, AES42, AES

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

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 7.5 oz with Battery
Dimensions (H x W x D) 5 cm x 11.5 cm x 4 cm
Display Graphic OLED


Power Output 25, 50 or 100 mW – Software Selectable
Battery Type 3 AA cells
Battery Life is dependent on Battery type and microphone power requirements

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Delivery Times

Delivery times are based on when the package(s) leaves our premises. Sometimes, due to stock restrictions or a non-completed order, delivery may take longer as there is a delay with couriers, which is unfortunately out of our hands. If your order is urgent, or details change, please do let us know.
For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 30 working days of receipt (14 to initiate the process), for a full refund or for an exchange for a different product from our range. Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may affect the level of refund you receive. For full details of our returns policy, please click here.

£2,130.00 £2,130.25
Saving Of:  £0.25 (0%)
(£1,775.00 Exc. VAT)
Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  ZAX-TRX743-6-3A
Part No.:  TRX 743
Manufacturer:  Zaxcom

Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.00am - 5.00pm, to discuss these options and find out what's available to you.

We accept Klarna, PayPal, Maestro, Visa, Mastercard & American Express

Zaxcom TRX 743 Plug-On Transmitter

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