QRX235

Four-Channel Receiver with ZaxNet

QRX235_GI-S
QRX235_RearGI-S
 Firmware | Manual

The missing Link

QRX235 is successor to the QRX100 boasting significantly enhanced distance and range.

Three key components give 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

QRX235 receives up to 4 channels of 100% digital audio from up to 2 transmitters, any combination of mono and stereo transmitters is accepted.  The audio output can be either analog or AES.  It also features our patented side mounted LED’s, these provide visual confirmation of audio and RF reception. The LED’s are very bright and are visible with the QRX235 mounted in its Zaxcom camera mount even in bright sunlight.

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.

Digital Modulation
All of Zaxcom’s wireless microphone system uses only 100% digital modulation, this results in audio quality superior to any analog or digital hybrid FM wireless system.

Zaxcom transmits its audio as 1s and 0s in a 100% digital form so no companding is needed to alter the audio content; this results in a much higher quality reproduction of the original audio under all circumstances.

Conventional FM wireless systems, including standard companded FM and digital hybrid wireless, use analog FM modulation and contain no digital content. Noise reduction systems, pilot tone squelch, FM distortion and RF interference all contribute to system performance that cannot begin to match that of a pure 100% digital system like Zaxcom’s digital wireless.

The range of Zaxcom’s new digital wireless 2.0 is now equivalent to, or better than, that of any FM radio system.

Encrypted Audio
Traditional FM wireless audio can be hacked into and listened to by any commercially available scanner.  In some situations this isn’t an issue, but there are times where privacy is necessary. For example paparazzi with an inexpensive device can listen in on your set. Or in the case of some corporate settings where there may be sensitive or legal matters discussed and you want to ensure that you have maximum privacy.

Zaxcom wireless systems, both the UHF transmission as well as audio sent via ZaxNet, features full digital audio encryption. Digital encryption is the only way to keep all audio transmission private.

The way it works is if you set an encryption code the transmitter, the audio will be encrypted and can only be listened to if the receiver has the matching encryption code entered. If you are trying to receive an audio signal and the codes do not match, all that will be heard is white-noise or silence.

Zaxcom’s encryption system features two sets of three numbers that form a single six-digit encryption code; this provides a total of 16,777,216 possible code combinations. So when using Zaxcom digital encryption you can ensure that your audio will only be heard by those who you want to hear it.

Intermodulation Resistant
Intermodulation occurs when the RF from multiple transmitters, in close proximity to each other, mix together in the transmitters amplifier, and combine their outputs. Intermodulation can occur even if you are running just two transmitters on set, or in a sound bag. Intermodulation is undesirable because it creates spurious emission which can greatly interfere with reception and degrade audio reception.
Zaxcom’s fully digital wireless is immune to most intermodulation. This will give you the confidence that you will be getting the cleanest RF signal possible with no need to worry about special channel spacing. And without the typical channel spacing limitations, that are necessary in other wireless systems, the number of useable channels that can safely fit into a frequency block is greatly increased.
ZaxNet
ZaxNet is a wireless network that runs on a user selectable 2.4 GHz RF signal. ZaxNet is used for the distribution of timecode, IFB audio and metadata. That same ZaxNet signal is also is used to control TRX wireless transmitters.

ZaxNet gives you the ability to control any Zaxcom TRX wireless remotely, so there is no need to approach talent and fumble with a transmitter anymore. You can remotely change the
frequency, pre-amp gain, transmitter output power and have the ability to place
the transmitter’s built-in recorder into record, playback and stop modes. All TRX transmitters also receive timecode for the built-in recorder via ZaxNet.

ZaxNet will also distribute audio, timecode and metadata over the same ZaxNet 2.4GHz frequency. This allows you to send timecode and audio throughout your set. An ERX-TCDwill receive Zaxnet and simultaneously output frame accurate timecode and audio. So an ERX-TCD mounted on a camera or digital slate will keep everything in perfect sync since the ERX will be constantly be re-jamming its timecode via ZaxNet. Another option is to use the ERX-TCD to simultaneously feed both timecode as well as a mono audio track to any camera (even if the camera does not have a  timecode input).

An ERX body pack receiver can also be used on set for anyone to monitor audio via the same ZaxNet signal. Not only can you use an ERX for monitoring audio but it can also aid in taking script notes since the LCD on the ERX can display timecode, user bits, and scene and take information.

Technical Details
RECEIVER
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 (X 4)
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 ?
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 ?
TIMECODE OUTPUT (QIFB OPTION ONLY)
Connector: Stereo 1/8? (3.5 mm)
Level Range: .2 to 5V, P-P
Impedance: 8 ?
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
MISC.
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