BW Broadcast RBRX1 User manual

RBRX1 Preliminary Manual
DSP FM RE-BROADCAST RECEIVER
Operational Manual
Version 0.90
www.bwbroadcast.com

BW Broadcast Technical Manual Page 3
Introduction
BW Broadcast warrants the mechanical and electronic components of this product to be free of defects in
material and workmanship for a period of two (2) years from the original date of purchase, in accordance with
the warranty regulations described below. If the product shows any defects within the specified warranty period
that are not due to normal wear and tear and/or improper handling by the user, BW Broadcast shall, at its sole
discretion, either repair or replace the product. If the unit has a manufacturers fault within twenty eight (28) days
then BW Broadcast will pay the freight at their discretion.
If the warranty claim proves to be justified, the product will be returned to the user freight prepaid. Warranty
claims other than those indicated above are expressly excluded.
Return authorisation number
To obtain warranty service, the buyer (or his authorized dealer) must call BW Broadcast during normal business
hours BEFORE returning the product. All inquiries must be accompanied by a description of the problem. BW
Broadcast will then issue a return authorization number.
Subsequently, the product must be returned in its original shipping carton, together with the return authorization
number to the address indicated by BW Broadcast. Shipments without freight prepaid will not be accepted.
Warranty regulations
Warranty services will be furnished only if the product is accompanied by a copy of the original retail dealer’s
invoice. Any product deemed eligible for repair or replacement by BW Broadcast under the terms of this
warranty will be repaired or replaced within 30 days of receipt of the product at BW Broadcast.
If the product needs to be modified or adapted in order to comply with applicable technical or safety standards
on a national or local level, in any country which is not the country for which the product was originally
developed and manufactured, this modification/adaptation shall not be considered a defect in materials or
workmanship. The warranty does not cover any such modification/adaptation, irrespective of whether it was
carried out properly or not. Under the terms of this warranty, BW Broadcast shall not be held responsible for any
cost resulting from such a modification/adaptation.
Free inspections and maintenance/repair work are expressly excluded from this warranty, in particular, if caused
by improper handling of the product by the user. This also applies to defects caused by normal wear and tear, in
particular, of faders, potentiometers, keys/buttons and similar parts.
Damages/defects caused by the following conditions are not covered by this warranty:
Misuse, neglect or failure to operate the unit in compliance with the instructions given in BW Broadcast user
or service manuals. Connection or operation of the unit in any way that does not comply with the technical
or safety regulations applicable in the country where the product is used. Damages/defects caused by force
majeure or any other condition that is beyond the control of BW Broadcast. Any repair or opening of the unit
carried out by unauthorized personnel (user included) will void the warranty.
If an inspection of the product by BW Broadcast shows that the defect in question is not covered by the
warranty, the inspection costs are payable by the customer.
Products which do not meet the terms of this warranty will be repaired exclusively at the buyer’s expense. BW
Broadcast will inform the buyer of any such circumstance. If the buyer fails to submit a written repair order
within 6 weeks after notification, BW Broadcast will return the unit C.O.D. with a separate invoice for freight and
packing. Such costs will also be invoiced separately when the buyer has sent in a written repair order.
Warranty transferability
This warranty is extended exclusively to the original buyer (customer of retail dealer) and is not transferable to
anyone who may subsequently purchase this product. No other person (retail dealer, etc.) shall be entitled to
give any warranty promise on behalf of BW Broadcast.
Claims for damages
Failure of BW Broadcast to provide proper warranty service shall not entitle the buyer to claim (consequential)
damages. In no event shall the liability of BW Broadcast exceed the invoiced value of the product.
Other warranty rights and national law
This warranty does not exclude or limit the buyer’s statutory rights provided by national law, in particular, any
such rights against the seller that arise from a legally effective purchase contract. The warranty regulations
mentioned herein are applicable unless they constitute an infringement of national warranty law.
WARRANTY

BW Broadcast Technical Manual Page 5
Safety Instructions
DETAILED SAFETY INSTRUCTIONS:
All the safety and operation instructions should be read before the appliance is operated.
Retain Instructions:
The safety and operating instructions should be retained for future reference.
Heed Warnings:
All warnings on the appliance and in the operating instructions should be adhered to.
Follow instructions:
All operation and user instructions should be followed.
Water and Moisture:
The appliance should not be used near water (e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a
wet basement, or near a swimming pool etc.).
The appliance should not be exposed to dripping or splashing and objects filled with liquids should not be
placed on the appliance.
Ventilation:
The appliance should be situated so that its location or position does not interfere with its proper ventilation.
For example, the appliance should not be situated on a bed, sofa rug, or similar surface that may block the
ventilation openings, or placed in a built-in installation, such as a bookcase or cabinet that may impede the
flow of air through the ventilation openings.
Heat:
The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other
appliance (including amplifiers) that produce heat.
Power Source:
The appliance should be connected to a power supply only of the type described in the operating instructions
or as marked on the appliance.
Grounding or Polarization:
Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
Power-Cord Protection:
Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed
upon or against them, paying particular attention to cords and plugs, convenience receptacles and the point
where they exit from the appliance.
Cleaning:
The appliance should be cleaned only as recommended by the manufacturer.
Non-use Periods:
The power cord of the appliance should be unplugged from the outlet when left unused for a long period of
time.
This symbol, wherever it appears,
alerts you to the presence of
uninsulated dangerous voltage inside
the enclosure—voltage that may be
sufficient to constitute a risk of shock.
This symbol, wherever it appears, alerts
you to important operating and mainte-
nance instructions in the accompanying
literature. Read the manual.
CAUTION: To reduce the risk of electrical shock, do not
remove the cover. No user serviceable parts inside. refer
servicing to qualified personnel.
WARNING: To reduce the risk of fire or electrical shock, do
not expose this appliance to rain or moisture.
SAFETY INSTRUCTIONS

BW Broadcast Technical Manual Page 6
Safety Instructions
Object and Liquid Entry:
Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through open-
ings.
Damage Requiring Service:
The appliance should be serviced by qualified service personnel when:
- The power supply cord or the plug has been damaged; or
- Objects have fallen, or liquid has been spilled into the appliance; or
- The appliance has been exposed to rain; or
- The appliance does not appear to operate normally or exhibits a marked change in performance; or
- The appliance has been dropped, or the enclosure damaged.
Servicing:
The user should not attempt to service the appliance beyond that is described in the Operating Instructions.
All other servicing should be referred to qualified service personnel.
CE CONFORMANCE: This device complies with the requirements of the EEC Council
Directives: 93/68/EEC (CE Marking); 73/23/EEC (Safety – low voltage directive);
2004/108/EC (electromagnetic compatibility). Conformity is declared to those standards:
EN50081-1, EN50082-1.
WARNING: This equipment generates, uses, and can radiate radio frequency energy.
If not installed and used in accordance with the instructions in this manual it may cause
interference to radio communications. It has been tested and found to comply with the
limits for a Class A computing device (pursuant to subpart J of Part 15 FCC Rules),
designed to provide reasonable protection against such interference when operated in
a commercial environment. Operation of this equipment in a residential area is likely to
cause interference, at which case, the user, at his own expense, will be required to take
whatever measures may be required to correct the interference.
CANADA WARNING: This digital apparatus does not exceed the Class A limits for radio noise emis-
sions set out in the Radio Interference Regulations of the Canadian Department of Communications.
Le present appareil numerique n'emet pas de bruits radioelectriques depassant les limits applicables
aux brouillage radioelectrique edicte par le ministere des Communications de Canada.

Introduction To The RBRX1
7
INTRODUCTION TOTHE RBRX1
The RBRX1 is unique, totally unique.
Not until now has their been an analogue FM reciever that works as you wanted it too.
Using digitial signal processing technology the RBRX1 is able to recieve signals clearer than you ever thought
possible. With its low distortion, greater stereo seperation, strong signal handling and weak signal processing the
RBRX1 is the market leading number one choice for FM reception.
The RBRX1 employs an image cancelling high dynamic range front end mixing system for on channel to IF
conversion. Together with the digital signal processed steep IF band filtering the RBRX1 achieves excellent
adjacent channel filtering, making it ideal for reception of distant fm signals when located on a transmitter site.
The digital demodulator of the RBRX1 is ultimately configurable - providing the user with a degree of flexibility
unheard of in FM reception products. RF and audio bandwidths are at the users control and with the adaptive
control settings the receiver can be left to adjust itself as neccesary, keeping out the noise from your audio but
while keeping to the limits that you have set. For the first time ever you are able to control the behaviour of the
radio - you are now the designer of your own products performance.
The RBRX1 has professional level balanced XLR connections for the analogue and AES/EBU outputs. As well
as recovering pristine audio the RBRX1 also decodes any transmitted RDS data.
For rebroadcast applications the RBRX1 provides digitally reconstructed MPX signals which are available via
back panel BNC connections. The recovered MPX signals are post processed to ensure both amplitude and
bandwidth levels are safe for rebroadcast. To help further with rebroadcast transmissions the RBRX1 can mute
the audio should an RDS PI code not match that set on the unit, helping to prevent hijacking of the transmission.
For ultimate flexability the RBRX1 can function as an RDS encoder, allowing RDS data to be changed or
inserted in the multiplex output.
The RBRX1 front panel control system is state of the art, with two Organic LED displays and touch sensitive
buttons and a wheel for user input. If placed at a remote site and front panel control not possible the built in web-
server allows monitoring and control from anywhere in the world using a web-browser.
The RBRX1 has a real time clock for time and day mode selection, back panel preset trigger ports and more -
each facility designed to make the unit flexible and easy to intergrate into any broadcast facility.
We know you love listening to Radio, the RBRX1 loves radio like you do.
Have Fun.

Connections
8
RBRX1 FRONT AND REAR PANELS
ANALOGUE
INPUT OUTPUT
LEFT RIGHT LEFT RIGHT INPUTOUTPUT SYNC RS232
GPIO
LAN USB
DIGITAL CONTROL
RF IN
MPX OUT
2
1
RBRX1
ANALOG
INPUTS
ANALOG
OUTPUTS
AES/EBU
OUTPUT
AES/EBU
SYNC
AES/EBU
INPUT
LAN
PORT
MAINS POWER INPUT
GPIO
&
RS232
RF
INPUT
USB
PORT
METERS
SCREEN
MAIN
SCREEN
EXIT
BUTTON
SOFT KEY 1
SOFT KEY 2
SOFT KEY 3 CONTROL WHEEL
&
ENTER BUTTON
SOFT KEY 4
MPX
OUTPUTS

Meters And Status LEDs
9
RBRX1 METERS
The RBRX1 has a very flexible metering system utilising a 256x64 pixel OLED display to provide detailed
metering of all of the units measurements. The RBRX1 provides five screens of meters which can be toggled by
pressing the "METERS" soft key.
Summary screen
This screen displays the tuner frequency, PS, PI and radio text in addition to left and right meters of the demod-
ulated received signal.
Audio processing screen
This screen indicates the amount of DSP signal conditioning that is being carried out on the received audio.
HI CUT High frequency attenuation being applied, 0% corresponds to no attenuation, 100% corre-
sponds to maximum attenuation
IF BW kHz IF filter bandwidth.
SOFTMUTE Automatic attenuator, 0% corresponds to no attenuation, 100% corresponds to maximum
attenuation.
STEREO BLEND Blending being applied, 0% stereo blending corresponds to maximum stereo separation,
100% stereo blending corresponds to mono.
Radio quality indicators screen
This screen displays the values of the various RF quality indicators that the tuner measures. These indicators
are used as inputs to the DSP signal conditioning block.
SIG (dBuV) RF signal level in dBμV.
PILOT (kHz) Stereo pilot level in kHz
USN Ultrasonic noise indicator
MULTIPATH Multipath noise indicator
RDS screen
This screen provides additional RDS decoding not shown on the summary screen, including PTY, traffic status
flags and AF information.
I/O metering screen
The input meters show the level of the input audio. The meters are ‘hooked in’ to the DSP code after the input
level selection and mode options. The clip indicators represent the onset of the A/D convertors clip-point and
these should not light under any circumstances. Adjust the input gain control of the RBRX1 if they do.
Stereo MPX screen
The multiplex output metering represents the composite outputs peak level. This is a representation of the out-
put in relation to the peak composite level of the processing and not the actual level set by the multiplex output
level control.
RBRX1 STATUS
The main screen on the RBRX1 is mainly used for parameter adjustment, but when the unit is left idle for a few
seconds it displays some useful status indications
PST: Indicates the currently active preset. If the active preset is loaded because of an alarm or trigger, it is pre-
fixed by '*'.
DIG: Indicates the presence of an AES/EBU signal connected to the digital audio input of the RBRX1.
SRC: Indicates which audio source is currently driving the multiplex generator. If the audio source is selected
because of an alarm or trigger, it is prefixed by '*'.

Software Update
10
SOFTWARE UPDATE
The RBRX1 is designed to allow features to be added to the unit in the field via a software update mechanism.
Software updates are available from www.bwbroadcast.com. To update your unit follow the procedure below.
UPDATING SOFTWARE VIA USB
1. Connect the RBRX1 to your computer using a USB Type A to USB Type B cable.
2. The RBRX1 will appear as a mass storage device named 'RBRX1'. This can be found in 'My Computer' on
computers running Microsoft Windows.
3. Browse the file system of the receiver by double clicking on the 'RBRX1' device, and open the 'upgrade'
directory. Place the .dat file in this 'upgrade' directory.
5. Disconnect the electricity supply from the unit by removing the power lead.
6. Wait for unit to power off.
7. Reconnect the electricity supply to the unit.
6. Observe the front LED display to ensure the upgrade completes sucsessfully.
UPDATING SOFTWARE VIA ETHERNET
The RBRX1 can be assigned a static IP address or may be configured to obtain an IP address automatically
using DHCP. You should contact your IT administrator for advice on how best to configure the unit for your
network.
STATIC IP ADDRESS:
1. Set DHCP to 'OFF'
2. Navigate to the ethernet menu (in system menu).
3. Set the IP address, Default Gateway and Subnet mask
4. It is recommended that you set the port to '80'
DHCP:
1. Set DHCP to 'ON'
2. Within a few minutes the unit should display the IP address, Default Gateway and Subnet mask which the
DHCP server has supplied
3. It is recommended that you set the port to '80'
UPDATE PROCEDURE:
1. Configure ethernet connection using chosen method above.
2. Using a web browser on a PC, connect to the IP address that you have configured the RBRX1 to use.
3. Click on 'Upgrade'.
4. Follow the webpage's instructions.

Interface
10
INTERFACE
The RBRX1 is designed to have an intuitive user interface. All of the units features can be accessed using the
front panel capacitive sense buttons and wheel.
NAVIGATING THE MENU:
Navigating the menu just requires the wheel in combination with the enter and exit keys. Use the wheel to select
a menu and then press the enter key to open it. The exit key will return you to the parent menu.
EDITING PARAMETERS:
Find the parameter you wish to edit by navigating the menu, then simpling press the enter key to start editing it.
While you are editing a parameter the background and text colors of the parameter will be interverted so that it is
always clear whether you are in navigate or edit mode. When you are editing a parameter, the wheel will adjust
the parameters value. To stop editing a parameter simply press the exit or enter buttons and you will return the
navigate mode.
TEXT INPUT:
Text input is required to name presets as well as for setting some parameters. By default the text input system
has two modes. In letter-edit mode the wheel lets you select a letter/symbol for the current character. In scroll
mode the wheel lets you move between characters.
Soft key one toggles between capital, lowercase letters and symbols.
Soft key two lets you switch into quick input mode.
Soft key three lets you delete a character.

Backup Audio
10
BACKUP AUDIO
The RBRX1 can provide playback backup audio in the case of the main feed failing. Audio can be loaded onto
the unit over USB by saving a standard wavefile as "backup.wav" in the root of the USB disk.
Switching to backup audio is just a matter of changing the MPX source to 'BACKUP', once this source is select-
ed, "backup.wav" will start playing on loop until this source is deselected. This switchover can be automated by
the Alarms/Triggers menu options. This allows an external trigger or internal alarm signal to force the unit into
backup mode.

Quickstart
11
QUICK START
1. Install the RBRX1 into the rack.
2. Connect AC power to the unit, and turn on the power.
3. Connect an antenna to RF In connector.
4. Connect the appropriate audio outputs.
4. Set the frequency.
FM REBROADCASTING USE:
5. Turn de-emphasis off (audio menu).
6. If you are using the MPX Output (preferred), navigate to the ‘STEREO MPX’ menu (in outputs menu), set the
'MPX Generator' to 'RADIO' and adjust the ‘MPX LEVEL’ to match the transmitter (or link device) that follows the
receiver. Adjust for 100% modulation with audio.
7. Select a factory preset (see Managing presets).
AF USE (OFF-AIR MONITORING):
5. Turn de-emphasis on (audio menu).
6. Connect the audio and/or digital outputs as required, navigate to the Analog or Digital menu (in outputs menu),
set the output to 'RADIO' and the output levels for the analogue and digital outputs to match the equipment that
the processor is connected to.
7. Select a factory preset (see Managing presets).
NOTE: The front panel headphone jack connects to the analogue outputs so the sound may be excessively
bright if de-emphasis is set to 'off'.

Source Quality And Pre-emphasis
12
DE-EMPHASIS
If you are using the DSPX-FM to process for FM re-broadcast you will need to disable the de-emphasis filter in
the RBRX1.
Even though your STL or transmitter may contain pre-emphasis we recommend disabling it, letting the received
RF signal remain pre-emphasised throughout the rebroadcast chain. Using de-emphasis and then pre-
emphasising again will only degrade performance and possibly casue overshoots, resulting in lower average
deviation.
The exception to the rule is when the RBRX1 is feeding discrete left and right outs to a compressed audio
STL. Bit rate reduction codec's do not cope with pre-emphasis very gracefully and artifacts will be generated.
The best option in this case is enable de-emphasise in the RBRX1 prior to the STL system. At the transmitter
site the pre-emphasis can be enabled in the transmitter to restore the processed signal back to normal prior to
transmission.
The best solution is always to locate the re-broadcast receiver at the transmission site. This way overshoots are
minimised and quality is maintained.

The RBRX1 And Its Processing Structure
13
THE RBRX1 AND ITS PROCESSING STRUCTURE
The RBRX1 can be used as a high quality off-air reference receiver and as a rebroadcast receiver. The receiver
is very sensitive and offers excellent signal selectivity. It is also capable of advanced digital signal processing to
produce the best possible audio signal.
At the IF stage the receiver has a automatic or user adjustable filter to provide adjacent channel supression.
After the signal has be demodulated to base band audio the receiver offers three further processing options,
stereo blend, high cut and soft mute. Each of these can be controlled by the RF quality indicators of signal,
multipath and ultrasonic noise. The stereo blend function can also be controlled by the pilot level indicator.
In addition to these receiver features the RBRX1 offers an RDS generator/repeater and a composite clip
protected MPX output protecting you rebroadcasted signal from overshoots. Finally, the RBRX1 has signal
quality alarms and features to detect jamming. These control signals can be used to switch in external backup
sources (using the analog or digital inputs) or an internal backup audio source.

Block diagram
14
ANALOG
DIGITAL
A/D
SRC
RADIO
ANALOG
USN
Detector
Multipath
Detector
Modulation
Detector
Oset
Detector
Pilot
Detector
Level
Detector
RADIODIGITAL
IF BW
Demodulator
Stereo
Decoder
Soft
Mute
LPF
Stereo
Blend
RF
BPF
IF AGC
PRE
LPF
15
MPX
MPX OUT 2
D/A
Stereo Encoder
COMP
CLIP PILOT
MPX OUT 1
Audio
Switching
Matrix
and
Mixer
DIGITAL
SRC
ANALOG
D/A
SYNC
Multipath
Supression
Remove
Oset
DE
RDS
Demodulator
RDS
Encoder
RDS
Decoder
BPF
Local
RDS
RADIO
1k
19k
Test Tone
Backup Audio
A/D
RBRX1 BLOCK DIAGRAM

Menu Structure
15
MENU STRUCTURE
MENU: RADIO
DE-EMPHASIS
IF BANDWIDTH
MENU: AUTO IF
DEFAULT BANDWIDTH
MINIMUM BANDWIDTH
THRESHOLD EXTENSION
MAXIMUM BOOST
MULTIPATH SPIKE SENS.
MENU: STEREO BLEND
STEREO SEPERATION
SIGNAL LEVEL START
SIGNAL LEVEL ATTACK
MULTIPATH START
MULTIPATH ATTACK
MULTIPATH RELEASE
USN START
USN ATTACK
USN RELEASE
PILOT START
PILOT ATTACK
PILOT RELEASE
MENU: HIGH CUT
HI CUT LIMIT
SIGNAL LEVEL START
SIGNAL LEVEL ATTACK
MULTIPATH START
MULTIPATH ATTACK
MULTIPATH RELEASE
USN START
USN ATTACK
USN RELEASE
MENU: SOFT MUTE
SIGNAL LEVEL START
SIGNAL LEVEL ATTACK
MULTIPATH START
MULTIPATH ATTACK
MULTIPATH RELEASE
USN START
USN ATTACK
USN RELEASE
MENU: AUDIO
RADIO VOLUME
AUDIO FILTER
MENU: MIXER
ANALOG
DIGITAL
RADIO
MENU: RDS
RDS LEVEL
SOURCE
PS
PI
PTY
RT
MENU: INPUTS
ANALOG GAIN
DIGITAL GAIN
MENU: OUTPUTS
HEADPHONE LEVEL
MENU: ANALOG
ANALOG OUTPUT
MENU: DIGITAL
DIGITAL OUTPUT
SAMPLE RATE
LEVEL
MENU: STEREO MPX
MPX GENERATOR
MPX LEVEL
PILOT LEVEL
PILOT PROTECTION
COMPOSITE CLIP
OUT2 SOURCE
OUT2 LEVEL
MENU: SCHEDULE (X) REPRESENTS 1-8
TIME
SYNC TO RDS
DAYPARTING ON/OFF
MENU: DAYPARTS 1-4
DP(X) ON/OFF
DP(X) START TIME
DP(X) TIME ON (LENGTH)
MENU: DAYPARTS 5-8
DP(X) ON/OFF
DP(X) START TIME
DP(X) TIME ON (LENGTH)
MENU: ALARMS/TRIGGERS (X) REPRESENTS 1-4
MENU: TRIGGER INPUTS
MENUS: TRIGGER INPUT(X)
ACTION
PRESET
SOURCE
MENU: OUTPUTS
MENUS: OUTPUT(X)
SOURCE
DELAY
PIN POLARITY
THRESHOLD
ACTION
PRESET
SOURCE
MENU: SYSTEM
CODE LOCK
MENU: ETHERNET
DHCP
IP
DG (DEFAULT GATEWAY)
SM (SUBNET MASK)
PORT NUMBER
MAC (MAC ADDRESS)
SCREEN SAVER
CLICKER

RBRX1 Parameters
16
RBRX1 PARAMETERS
The 'RADIO' menu contains all of the options and parameters relating to the control and conditioning of
the radio signal.
'De-Emphasis' controls the de-emphasis setting of the received audio. Options are Off, 50 μS (Europe) and
75 μS (USA).
'IF Bandwidth' This parameter allows you to manually set the intermediate frequency filter bandwidth, or
configure it to be automatically adjusted
The 'AUTO IF' menu is only available if the IF Bandwidth parameter is set to auto. It allows you to adjust the
parameters of the automatic IF adjustment algorithm.
'Default Bandwidth' sets the filter bandwidth that will be used under good signal conditions
'Minimum Bandwidth' sets the minimum filter bandwidth
'Threshold extension' sets the minimum filter bandwidth for low signal strengths
'Maximum Boost' For signals with large modulation deviation, the default bandwidth may be too small.
This parameter allows the maximum bandwidth boost that will be applied for very heavily modulated sig-
nals to be set.
The 'STEREO BLEND' menu allows you to adjust the parameters of the Stereo Blend algorithm.
'Stereo Seperation' sets the maximum stereo seperation. 100% corresponds to maximum seperation,
0% corresponds to mono.
'Signal Level Start' sets what level the signal needs to drop below to start influencing the amount of
stereo blend.
'Signal Level Attack' sets how quickly the stereo blend algorithm responds to the signal level reducing.
'Signal Level Release' sets how quickly the stereo blend algorithm responds to the signal level increas-
ing.
'Multipath Start' sets what level the multipath detector needs to rise to above to start influencing the
amount of stereo blend.
'Multipath Attack' sets how quickly the stereo blend algorithm responds to the multipath dectector
increasing.
'Multipath Release' sets how quickly the stereo blend algorithm responds to the multipath detector
decreasing.
'USN Start' sets what level the ultra-sonic noise detector needs to rise to above to start influencing the
amount of stereo blend.
'USN Attack' sets how quickly the stereo blend algorithm responds to the ultra-sonic noise dectector
increasing.
'USN Release' sets how quickly the stereo blend algorithm responds to the ultra-sonic noise detector
decreasing.
'Pilot Start' sets what level the pilot needs to drop below to start influencing the amount of stereo blend.
'Pilot Attack' sets how quickly the stereo blend algorithm responds to the pilot level reducing.
'Pilot Level Release' sets how quickly the stereo blend algorithm responds to the pilot level increasing.
The 'HIGH CUT' menu allows you to adjust the parameters of the High Cut algorithm.

RBRX1 Parameters
17
'Hi Cut Limit' sets the minimum bandwidth of the high cut filter.
'Signal Level Start' sets what level the signal needs to drop below to start influencing the amount of high
cut.
'Signal Level Attack' sets how quickly the hight cut algorithm responds to the signal level reducing.
'Signal Level Release' sets how quickly the hight cut algorithm responds to the signal level increasing.
'Multipath Start' sets what level the multipath detector needs to rise to above to start influencing the
amount of hight cut.
'Multipath Attack' sets how quickly the hight cut algorithm responds to the multipath dectector increas-
ing.
'Multipath Release' sets how quickly the hight cut algorithm responds to the multipath detector decreas-
ing.
'USN Start' sets what level the ultra-sonic noise detector needs to rise to above to start influencing the
amount of hight cut.
'USN Attack' sets how quickly the hight cut algorithm responds to the ultra-sonic noise dectector increas-
ing.
'USN Release' sets how quickly the hight cut algorithm responds to the ultra-sonic noise detector
decreasing.
The SOFT MUTE' menu allows you to adjust the parameters of the soft mute.
'Signal Level Start' sets what level the signal needs to drop below to start influencing the amount of soft
mute.
'Signal Level Attack' sets how quickly the soft mute responds to the signal level reducing.
'Signal Level Release' sets how quickly the soft mute responds to the signal level increasing.
'Multipath Start' sets what level the multipath detector needs to rise to above to start influencing the
amount of soft mute.
'Multipath Attack' sets how quickly the soft mute responds to the multipath dectector increasing.
'Multipath Release' sets how quickly the soft mute responds to the multipath detector decreasing.
'USN Start' sets what level the ultra-sonic noise detector needs to rise to above to start influencing the
amount of soft mute.
'USN Attack' sets how quickly the soft mute responds to the ultra-sonic noise dectector increasing.
'USN Release' sets how quickly the soft mute responds to the ultra-sonic noise detector decreasing.
The 'AUDIO' menu contains all of the options and parameters relating to the control and conditioning of
the audio signal.
'Radio Volume' allows the volume of the received audio to be adjusted in the range ±3dB.
The 'MIXER' menu allows you to adjust the volumes of the inputs to the audio mixer.
'Analog' sets the volume of the analog input source.
'Digital' sets the volume of the digital input source.
'Radio' sets the volume of the radio.
The 'RDS' menu contains all of the options and parameters relating to the RDS generator/repeater.

RBRX1 Parameters
18
'RDS Level' controls the level of the RDS signal included in the multiplex. Options are Off, 1.5%, 2%, 2.5%,
3%, 3.5%, 4%, 4.5% and 5%.
'Source' controls the source to the RDS generator. Options are Radio, Local, and Radio with local fallback.
'PS' allows the PS (Program Service name) to be set.
'PI' allows the PI (Program Identification) to be set.
'PTY' allows the PTY (Program Type) to be set.
'RT' allows the radiotext to be set
The 'Inputs' menu contains all the controls that affect input level control and signal conditioning.
'Analog Gain' controls the gain applied to the analog signals before they are converted to the digital domain
for processing.
'Digital Gain' controls the gain applied to the digital inputs to the unit, enabling calibration of different house
reference levels.
The 'Ouputs' menu contains all the controls that affect ouput selection, level control and signal condi-
tioning.
'Headphone Level' sets the output level of the front panel headphone port. Range is 0 to 32 with higher
numbers equating to more volume.
The 'ANALOG' menu contains the controls relevant to the analogue outputs.
'Analog Output' sets which signal will be output on the analog connectors. Options are Radio, AES In,
Analog in and Sine.
The 'DIGITAL' menu contains the controls relevant to the AES/EBU digital outputs.
'Digital Output' sets which signal will be output on the digital connector. Options are Radio, AES In,
Analog in and Sine.
'SAMPLE RATE' sets the output sampling rate for the AES/EBU digital output. The available rates are 32
KHz, 44.1 KHz, 48 KHz, follow digital input rate and follow external sync rate.
'Level' controls the peak output level of the digital output. Range is -12dBFS to 0dBFS
The 'STEREO MPX' menu contains all the controls relevant to the DSP stereo encoder that generates the
multiplex signal.
'MPX Generator' sets which signal will be the source of the MPX generator. Options are Radio, AES In,
Analog in and Sine.
'MPX Level' controls the output level of the composite MPX output. Range is 0dBu to +12dBu.
'PILOT LEVEL' sets the level of the composite signals 19 Khz pilot tone. The adjustable range is 6% to
12% and an OFF setting for mono applications.
'PILOT PROTECTION' activates a narrow notch filter that protects the pilot in the multiplex signal. If
you are using lots of composite clipping, this filter will protect the pilot region from being contaminated
with harmonic products. As a consequence, you might need to readjust the MPX output level slightly as
activating this filter may increase overshoots slightly (how much will depend on the amount of composite
clipping used).
'Composite Clip' controls the drive into the composite clipper which effectively sets the amount of com-
posite clipping. The trange of composite clipping is -0.5dB to +2dB.
'OUT 2 Source' sets which signal will be the source of the second BNC output. Options are MPX gen-
erator or Pilot.

RBRX1 Parameters
19
'OUT2 Level' controls the output level of the second BNC output. Range is 0dBu to +12dBu.
The 'SCHEDULE' menu contains all the controls for the dayparting (REAL TIME CLOCK) preset switch-
ing.
'TIME' Sets the time and day of the RBRX1’s Real Time Clock.
'Sync to RDS ON/OFF: Controls whether the RTC is syncronised with time information which arrives over
RDS.
'DAYPARTING ON/OFF: Enables or disables the scheduling.
'DP(X) ON/OFF' Enables or disables an individual daypart schedule.
'DP(X)' Sets the preset to switch to when this daypart is triggered.
'DP(X) START' Sets the start time day and time of the daypart. There is also an ‘ALL days’ option.
'DP(X) LENGTH' Sets the length in minutes that the daypart will run for.
The 'ALARMS/TRIGGERS' menu contains all the controls that affect the alarm outputs, trigger inputs
and auto fallback.
The 'TRIGGER INPUTS' menu contains the controls relevant to the trigger inputs.
The 'TRIGGER INPUT (X)' menu contains all the controls relevant to the (X)th trigger input
'Action' selects what action the input will trigger. Options are change preset and change source.
'Preset' selects which preset to change to if action is set to change preset.
'Source' selects which source to change to if action is set to change source. Options are Radio,
Digital In, Analog in, Mixer, Sine and Backup.
The 'OUTPUTS' menu contains the controls relevant to the alarm outputs.
The 'OUTPUT (X)' menu contains all the controls relevant to the (X)th alarm output.
'Source' selects which detector is the source for the alarm. Options are signal, pilot, audio level,
USN, Multipath, PI, TA and TP.
'Delay' selects how long the detector has to be in an error state before an alarm is trigger. This also
controls how long the detector has to be in a correct state before an alarm is de-activated.
'Pin Polarity' selects whether the output is active high or active low
'Signal' selects the threshold below which the signal will trigger an alarm.
'Pilot' selects the threshold below which the pilot level will trigger an alarm.
'Audio Level' selects the threshold below which the audio level will trigger an alarm.
'USN' selects the threshold above which the USN detector will trigger an alarm.
'Multipath' selects the threshold above which the USN detector will trigger an alarm.
'PI' sets the PI code. If the PI code is different from the one set, an alarm will be triggered
'Action' selects what action the input will trigger. Options are pin only, change preset and change
source.
'Preset' selects which preset to change to if action is set to change preset.
'Source' selects which source to change to if action is set to change source. Options are Radio,
Digital In, Analog in, Mixer, Sine and Backup.

RBRX1 Parameters
20
The 'SYSTEM' menu contains all the system controls (non processing) such as remote control and secu-
rity
'CODE LOCK' This enables or disables the security code lock. The options are enabled and disabled. More
information is available in the code lock section of this manual.
The 'ETHERNET' menu contains the controls relevant to the LAN/NET port.
'DHCP' Turns on/off the DHCP client, allowing the unit to automatically obtain an IP address, default
gateway and subnet mask from a DHCP server.
'IP' Sets the IP address of the LAN port.
'DG' Sets the default gateway of the LAN port.
'PORT' Sets the port number of the webserver.
'Screen saver' This allows the time-out before the screensaver starts to be adjusted between 5 and 30 min-
utes.
'Clicker' This allows the button click to be turned on/off.