Zaxcom RX-4 User manual

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User Manual
Published February 2021
Firmware Version MRX-184
RX-4

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RX-4 RECEIVER.................................................................................................................................. 3
FRONT ......................................................................................................................................................................3
REAR ........................................................................................................................................................................4
HOME SCREEN.................................................................................................................................. 5
MAIN MENU..................................................................................................................................... 6
NAVIGATING THE MAIN MENU .....................................................................................................................................6
EXITING THE MAIN MENU............................................................................................................................................6
FREQUENCY ADJUST....................................................................................................................................................6
Adjusting the receive frequency of the RX-4 ..................................................................................................... 6
CENTER FREQUENCY ADJUST ........................................................................................................................................6
FREQUENCY SCAN.......................................................................................................................................................6
Single mode scanning ........................................................................................................................................ 7
Selecting a frequency......................................................................................................................................... 7
SET BANDWIDTH ........................................................................................................................................................ 7
TEST TONE OUTPUT .................................................................................................................................................... 7
EXTENDED MENU ............................................................................................................................. 8
NAVIGATING THE EXTENDED MENU............................................................................................................................... 8
EXITING THE EXTENDED MENU .....................................................................................................................................8
MODULATION SELECT..................................................................................................................................................8
SINGLE /DUAL MODE SELECT.......................................................................................................................................8
OUTPUT ROUTER........................................................................................................................................................9
LED ON /OFF .........................................................................................................................................................10
ENCRYPTION CODE SET..............................................................................................................................................10
Adjusting the encryption code.........................................................................................................................10
PIN CONFIGURATION...................................................................................................................... 11
AUDIO OUTPUT CONNECTORS ....................................................................................................................................11
Analog Out of TA5............................................................................................................................................11
AES Digital Out of TA5......................................................................................................................................11
POWER CONNECTOR (HIROSE-4 CONNECTOR) ..............................................................................................................11
OPERATING FREQUENCIES .............................................................................................................. 12
UHF -AUDIO...........................................................................................................................................................12
ANTENNA CUTTING CHART ............................................................................................................. 13
SPECIFICATIONS.............................................................................................................................. 14
PRODUCT SUPPORT ........................................................................................................................ 15
ZAXCOM WARRANTY POLICY AND LIMITATIONS............................................................................. 16

Zaxcom RX-4 Front
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RX-4 Receiver
Front
1. OLED Displays (2)
2. INC Key - Used to increase the parameters of a menu item.
3. Dec Key - Used to decrease the parameters of a menu item.
Press and hold to access the extended menu.
4. Menu Key - Press to advance to the next menu item.
5. UHF Antenna Connectors (2) - SMA connectors.
6. Receiver Status Indicators (4)
Green - Receiver is receiving a valid signal.
Red - Receiver is not getting a valid signal.
7. Receiver Select keys (2) -Press to alternate between receivers.
The RX 1/2 key will power the RX-4. Press and hold the key for 5 seconds to power down the RX-4.
Press the RX 1/2 key to toggle thru receivers when choosing frequencies.

Zaxcom RX-4 Rear
4
Rear
1. DC Power Input – Hirose 4 pin power input.
2. Audio out connectors (2) - TA5M
These connectors will output the audio from the RX-12. The same connectors can be used to output
either analog audio or AES audio.

Zaxcom RX-4 Home Screen
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Home Screen
Audio level
Indicates the incoming audio level for each receiver, the meter extends from the left to the right. The two
vertical bars to the right are the -20dBFS and -10dBFS mark.
Transmitter’s battery level
The battery diagram displays the transmitter’s battery level. The battery type being used in the transmitter needs
to be set in the transmitters extended menu. The battery symbol will start to blink just before transmitter shuts
down.
Transmitter’s record status
•S (STOP) The transmitter is stopped.
•R (REC) The transmitter is recording.
•P (PLAY) The transmitter is playing back.
RF signal strength
This shows the radio signal strength of the corresponding transmitter. The RF signal is depicted as a staircase
pattern with the lowest step (low signal strength) on the left and building up as it progresses to the right (higher
signal strength). When more stairs are showing the stronger the signal is.
Receiving antenna
Indicates the signal is being received by antenna 1 (left antenna connector)
Indicates the signal is being received by antenna 2 (right antenna connector)
AS
BS

Zaxcom RX-4 Main Menu
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Main Menu
Navigating the Main Menu
•Choose the desired receiver by pressing the RECEIVER key - a bracket will appear around the active receiver.
•To enter the main menu - press and the MENU key.
•To advance to the next menu press the MENU key again.
Exiting the Main Menu
•To exit the main menu at any time, press and hold the MENU key for 1.5 seconds.
Frequency Adjust
The frequency select menu is where the receive frequencies are set. These frequencies need to match the
frequencies that are set on the corresponding transmitters.
Adjusting the receive frequency of the RX-4
•Press the INC key and DEC key to adjust the frequency.
•In dual receive mode pressing the RECEIVER key will toggle between the A and B receiver.
The > will indicate the receiver being adjusted.
•Please note that all frequencies needs to be within the range of the center of the front-end filter. If the
frequency difference is out of range “TOO BIG” or “TOO SMALL” will flash on the screen to warn that the
difference is wider than the filter range and the frequency will need to be adjusted.
Center Frequency Adjust
This where the center frequency of the front-end filter is set. The front-end filter is 40 MHz wide so frequencies 20
MHz above and 20 MHz below the center frequency will be the operating range of the RX-4.
Frequency Scan
The frequency scan menu is where the A receiver of the RX-4 can scan the user specified frequency range and
search for a clear frequency. After the scan is complete a graphical display of the RF that is present, in that
specified range will be shown and the RX-4 will suggest a clear frequency. That frequency can be accepted by
pressing the INC key. Or press the DEC key to skip the first chosen frequency and have the RX-4 suggest another
frequency.
CH A > 567.4
CH B 570.0
CENTER FREQ:
550.0 MHZ
PRESS TO SCAN
530.0 TO 570.0

Zaxcom RX-4 Main Menu
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Single mode scanning
•Turn off the transmitter(s).
•Press the INC key to initiate a scan.
•While the RX-4 is scanning, the frequency being examined is displayed
on the bottom half of the screen and a graphic map of the RF that is
found will be displayed with a vertical line extending up from the
baseline. The length of the line indicates the level or strength of the
found RF at that frequency.
•Pressing the MENU key while scanning will abort the scan.
Selecting a frequency
When the scan is complete a suggested frequency will be shown, and a
vertical blinking line will be drawn on the display.
At that point:
•Press the left RECEIVER key to select the desired receiver
(RXA, RXB, RXC, RXD). Please note if the receivers are in single mode then RX A and RX C would be used.
•Press the INC key to accept the frequency.
•Press the DEC key to select another frequency.
The scan result is always available as long as there is valid scan data. So, this screen can be revisited, and different
frequencies can be chosen.
Set Bandwidth
The bandwidth range will set how wide the operating range will be on either side of the center frequency. The
bandwidth can be adjusted from 4 to 40 MHz.
Test Tone Output
From the tone menu a 1K test tone can be enabled. The tone will be outputted from the TA5 connectors. This
is used to set levels and check routing.
Pressing the INC and DEC key will cycle through the different tone settings.
•OFF - No tone is being outputted.
•-20dBFS -Tone is simultaneously sent to all 4 outputs at -20dBFS.
•CHAN-ID -Tone is sequentially sent to each channel one at a time at -20dBFS.
•+0dBFS -Simultaneously sends tone to all 4 channels at 0dBFS (full scale)
TONE:
OFF
SCANNING 568.9
TAKE 618.2 RXA
SCAN BW: 40 MHZ
530.0 TO 570.0

Zaxcom RX-4 Extended Menu
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Extended Menu
Navigating the Extended Menu
•Press and hold the DEC key from the home screen to enter the extended menu.
•To advance to the next menu press the MENU key.
•Press and hold the MENU key at any point to return to the top of the extended menu.
Exiting the Extended Menu
•To exit the extended menu - press and hold the MENU key then press the INC key.
Modulation Select
From this menu the modulation mode is selected. Modulation is simply the way a transmitter “modulates”, or
sends, its signal to the RX4. This setting needs to match the modulation mode that the corresponding
transmitter is set to - if the two setting do not match the RX4 will not be able to receive and decode the signal
from the transmitter.
Single / Dual Mode Select
•SINGLE - This configures the one side of the RX-4 to operate as a single receiver. In single mode the side of the
RX-4 can receive one audio channel from one transmitter.
•DUAL - This configures the one side of RX-4 to operate as two independent receivers. In dual mode the side of
the RX-4 can receive audio from two transmitters.
RX MODE:
SINGLE
RX FMT: ZHD-96

Zaxcom RX-4 Extended Menu
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Output Router
The routing menu is where the TA5 connectors are assigned an output.
After changing modes it is necessary to reboot the RX-4.
Please note this menu is only in the A receiver but will control both the A and B receiver.
•Mode 0 AES MONO-MONO – Each receiver side (A, B) will receive signal from two mono transmitters. AES
audio will be outputted for each side on pins 2 and 3.
•Mode 1 AES STEREO-MONO – The (A)receiver side will receive signal from 1 stereo transmitter and the B
receiver side will receive signal from two mono transmitters.
AES audio will be outputted on each side on pins 2 and 3.
•Mode 2 AES STEREO-STEREO –Each receiver side (A, B) will receive signal from one stereo transmitter.
AES audio will be outputted on each side on pins 2 and 3.
•Mode 3 ANALOG MONO-MONO – Each receiver side (A, B) will receive signal from two mono transmitters.
Analog audio will be outputted on each side on pins 2 and 3, 4 and 5.
•Mode 4 ANALOG STEREO-STEREO –Each receiver side (A, B) will receive signal from one stereo transmitter.
Analog audio will be outputted for each side on pins 2 and 3, 4 and 5.
•Mode 5 ANALOG STEREO-MONO – The (A)receiver side will receive 1 stereo transmitter and the (B) receiver
side will receive two mono transmitters.
Analog audio will be outputted on each side on pins 2 and 3, 4 and 5.
•Mode 6 AES, ANALOG –Each receiver (A, B) side will receive signal from a single mono transmitter. The
audio will be outputted as both a digital and an analog signal simultaneously.
AES audio will be outputted on pins 2 and 3 and the analog signal will be on pins 4 and 5 with pin 1 being
ground.
ROUTER MODE: 0
AES MONO-MONO

Zaxcom RX-4 Extended Menu
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LED On / Off
This menu toggles on / off the receiver LED’s.
Encryption Code Set
The encryption menu is where the encryption is turned on and the code is set. The encryption code needs to
match the encryption code of the associated transmitters. If an encryption code is set on the transmitter the
transmitted audio will be encrypted and can only be listened to if the RX-4 has the same matching encryption
code entered. When the codes do not match, all that will be heard is white noise.
These two sets of numbers are formed into a single six-digit encryption code which provides a total of
16,777,216 possible combinations. For non-encrypted operations all six numbers should be set to 0.
Encryption can be set independently for each receiver side.
Adjusting the encryption code
1. Press the RECEIVER key to advance to the desired character.
2. To change the designated character, press the INC or DEC key.
3. Press the MENU key to exit.
LEDS:
ON
ID1: 000 ID0: 000