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RBRX1 Preliminary Manual

DSP FM RE-BROADCAST RECEIVER

Operational Manual

Version 0.90

www.bwbroadcast.com

Summary of Contents for RBRX1

Page 1: ...RBRX1 Preliminary Manual DSP FM RE BROADCAST RECEIVER Operational Manual Version 0 90 www bwbroadcast com ...

Page 2: ... 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 ...

Page 3: ...sters 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...

Page 4: ...tive 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 p...

Page 5: ... 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...

Page 6: ...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 ...

Page 7: ...Hz 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 T...

Page 8: ...ctricity 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 Navigat...

Page 9: ...rameter 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 so...

Page 10: ... 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 ...

Page 11: ... 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 t...

Page 12: ...ershoots 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 en...

Page 13: ...dulated 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 p...

Page 14: ...ITAL 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 Offset DE RDS Demodulator RDS Encoder RDS Decoder BPF Local RDS RADIO 1k 19k Test Tone Backup Audio A D RBRX1 BLOCK DIAGRAM ...

Page 15: ...ENU 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 ...

Page 16: ...o 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...

Page 17: ...ds 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 ...

Page 18: ...ill 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...

Page 19: ... 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 ...

Page 20: ...ERNET 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 ...

Page 21: ...ween bandwidth and noise to be tweaked V1 contains the following factory presets F1 Clean This preset provides a good general purpose set of radio parameters allowing high quality signals to pass through with very little processing whilst minimising the increase in noise if the signal deteriorates F2 Open This preset switches out most of the processing leaving the IF filter open even for very nois...

Page 22: ... Trigger Inputs The RBRX1 has four opto coupled inputs which allow external signals to change the MPX source or the current preset The inputs are activated by pulling the pin low If more than one trigger is active at the same time and configured to produce conflicting behaviour the lower trigger number gets priority external triggers are higher priority than internal triggers GPIO Trigger and Alar...

Page 23: ...www bwbroadcast com ...

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