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Zaxcom QRX235 Audio & Timecode Receiver

Code: ZAX/QRX235
The Zaxcom QRX235 digital wireless receiver is an improvement on the QRX100. It is ordered in the same standard frequency blocks, but its new RF modulation allows transmitter and receiver to venture farther from one another while maintaining stable signal transfer. Also available with the QIFB option.

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QRX235 and QRX200 Digital Wireless from Zaxcom on Vimeo.

The QRX235 is exactly like the QRX100 but with significantly enhanced distance and range.

There are three components that give the QRX235 its enhanced distance / range.

  • New digital modulation.
  • Enhanced receiver design giving it maximum sensitivity while lowering its noise floor.
  • The elimination in any difference between single and dual mode.

Side mounted LED’s provide visual confirmation of audio and RF reception. A group of 12 multi-colored LEDs are recessed into the side of the QRX200 (Patented). They are visible with the QRX200 mounted in its Zaxcom camera mount and provide the sound mixer with visual confirmation of audio reception at the camera. The LEDs are very bright and can be seen from quite a distance even in bright sunlight.

The QRX235 receives up to 4 channels of 100% digital audio from up to 2 transmitters.

Audio out of the QRX235 can either be an analog signal or as an AES digital signal.

The ZaxNet QIFB option is available in the QRX235 – The QIFB allows you to send or receive ZaxNet audio and timecode, as well as TRX commands from your QRX235.

Any combination of Zaxcom TRX series mono or stereo transmitters can be used with the QRX235.

Digital Modulation

100% digital transmission for audio quality that rivals a hard-wired system and are fully encrypted to eliminate the possibility of production audio interception and theft.

Encrypted Audio

Keeps transmitted audio private.

Intermodulation Resistant

Removes unwanted spurious emissions for a cleaner signal.


Built-in timecode reader and generator.


Provides wireless timecode, ZaxNet audio and remote control between Zaxcom products.

ZaxNet Remote

Controls your wireless transmitters remotely.


Single Mode Receiver Type: True diversity single conversion digital demodulator
Dual Mode Receiver Type: Antenna diversity single conversion digital demodulator
RF Modulation: proprietary digital method
RF Frequency Range: 518.0 to 872.0 MHz (blocks are 20 to 36 MHz wide)
RF Frequency Step: 100 KHz
RF Bandwidth: 200 KHz
Channel Separation: 500 KHz (700 KHz recommended)
Sensitivity: -110 dBm
Antenna Connector: 50-ohm SMA female

Receiver Audio – Analog Output (x4)

Dynamic Range: 114 dB
Distortion: 0.001%
DAC Bit-depth: 24 bits
DAC Rate: 48 kHz
Connector: TA-5M
Audio Output Level: Line: -10 to 0 dBm active balanced

Receiver Audio - Digital Output (x4)

Signal Format: AES Balanced
Audio Output Connector: TA-5M

IFB Transmitter (QIFB Option Only)

RF Power Output: 50 mW
RF Modulation: Digital Spread Spectrum
RF Frequency Range: 2.403 to 2.475 GHz
RF Frequency Step: 0.001 GHz (1 MHz)
RF Bandwidth: 1 MHz
Channel Separation: 2 MHz
Antenna Connector: 50-ohm SMA Female
Emission Designator: 180 KV2E
FCC Part: CFR Title 47, Part 18IFB

2.4 GHz Audio Transmitter (QIFB Option Only)

Dynamic Range: 103 dB
Distortion: 0.01%
Frequency Response: 20 Hz to 12 kHz
System Group Delay: 10 ms

IFB Audio Input (QIFB Option Only)

Connector: Stereo 1/8″ (3.5 mm)
Type: Balanced / Unbalanced
Level: -10 dBu
Impedance: 10 k Ω
ADC Bit-depth: 24 bits
ADC Sampling Rate: 48 kHz

Timecode Input (QIFB Option Only)

Connector: Stereo 1/8″ (3.5 mm)
Level Range: 1 to 5V, P-P
Impedance: 10 k Ω

Timecode Output (QIFB Option Only)

Connector: Stereo 1/8″ (3.5 mm)
Level Range: .2 to 5V, P-P
Impedance: 8 Ω

Timecode Reader / Generator (QIFB Option Only)

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


Weight: 6.0 oz (170 grams)
Dimensions: 1.25″ x 3.25″ x 5.25″ (32mm x 83mm x 133mm)
External Power: 9 to 18 VDC (300mA @ 12VDC)
Internal Power: N/A
Display: Graphic LCD Panel