WisyCom MRK960 User manual
User Manual
Rev.06 (ref. FW 1.1.0.H)
Date: 20 January 2020
Pag. 2
MRK960 dual true diversity receiver
The MRK960 is a high performance microphone system suitable for broadcast and high professional applica-
on. Thanks to its exceponal selecvity and intermodulaon immunity, MRK960 is able to operate even in
the presence of very high DVTB-T transmier’s signals.
The extreme bandwidth agility of 370 MHz allows you to always nd & work on the best frequencies avail-
able. MRK960 is designed to be:
••“easy & quick to use” thanks to automac setup funcons (i.e. frequencies, squelch), remote conguraon
ulies (USB/Ethernet), a display with intuive context menu navigaon.
••“extremely exible”, with an incredible frequency agility of 370 MHz; more than one rack can be connected
together thru a simple USB cable to act a mul-channel receiver. Moreover the DSP board allows the units
to work with several digital audio outputs (i.e. AES/EBU, Ethersound, …), with mul-companding compat-
ibilies and other digital features.
••“best in class performances”, thanks to the latest Wisycom technology the unit has extreme RF sensivity
and immunity and superb audio quality.
••“a durable & upgradable investment”, thanks to the very robust design (aluminum housing) and the possi-
bility of upgrade/enhance units performances with simple slot in card (pc-like thru the DEXB expansion bus)
Moreover MRK960 system is already set up for the exclusive PTT funcon (remote command), developed and
patented by Wisycom and now appreciated in the broadcast world:
Simply pushing this button (PTT), the presenter causes the remote switching of the receiver’s output-
line, from the “main line” to the additional “intercom line”, in order to be able to talk “o-air” directly
with the technical team. Then all PTT’s MICs can be connected in pre-fading allowing a clever intercom
setup.
••Read this safety instrucon and the manual rst.
••Follow all instrucons and informaon.
••Do not loose this manual.
••Do not use this apparatus under the rain or near the water.
••ATTENTION: supply the apparatus with a correct mains voltage and with the ground connecon. Check the
power cord integrity.
••The power cord must be protected from damage.
••Do not install the apparatus near heaters or in hot environments, do not use outside the operang tempera-
ture range.
••Mount the apparatus as indicated in the instrucon, do not block side grids for air venlaon.
••If the external air lter is mounted, clean it regularly.
Pag. 3
MRK960 dual true diversity receiver
••WARNING: do not open the apparatus, RISK OF ELECTRIC SHOCK!
••Do not open the apparatus, only qualied service technician are enabled to operate on it. The apparatus
needs servicing when is not properly working or is damaged by liquids, moisture or other objects are fallen
in the apparatus.
••Use only accessories or replacement parts authorized or specied from the manufacturer.
••Do not supply more than 7 apparatus MRK960 from the mains output, see power requirements for other
apparatus.
••Clean the apparatus only with dry cloths, do not use liquids.
••The ON/OFF is a double pole circuit breaker, but to ensure the complete disconnecon of the apparatus,
disconnect the power cord.
••Report the serial number and the purchasing date in front of the manual, it is needed to have proper re-
placement parts or accessories from the manufacturer.
••When replacement parts are needed, use only replacement parts authorized from the manufacturer. Sub-
stuon with not authorized parts could result in electric shock, hazards or re.
»Keep attention on all the labels with warnings or hazards on the apparatus.
••WARNING: The apparatus is intended for professional use; anyway the manufacturer alerts the user that
the headphone output power of the apparatus could exceed the level of 85 dB(A) of sound pressure level
and this could be dangerous for the hearings. Do not use the headphone with high power level or for long
me. Reduce the power or suspend the hearing in the case of any kind of hearing problem.
Main features
MRK 960 is a modular wireless-microphone receiver System in a 19” 1 unit module, stackable, with dual true
diversity receivers:
••Extreme RF (radiofrequency) performances and reliability.
••Tuning windows of 240 MHz with tunables lters (2 ch’s independent): 470/840 MHz (TV ch 21/67)
with internal acve splier
••Wisycom digital expansion bus (DEXB) for future upgrade/enhancement thru simple slot-in card (pc-like).
DEXB can host DSP (40bit dsp processing) upgrade cards providing:
••digital output (i.e. AES3, Ethersound)
••mul-companding compability
••future digital funconality enhancements.
••Balanced electronic AF output (low impedance transformer-coupled oponal)
••2 USB’s connectors for conguraon/monitor and cascade rack connecons
••Automac scan for best channels, squelch and other automac setup
••Infrared interface (i.e. for system setup, microphone programming)
••Automac transmier re-programming (thru infrared, sync funcon)
Pag. 4
MRK960 dual true diversity receiver
••Soware to monitor/setup units and with spectrum eld analysis
••Ethernet 10/100 base Tx network interface for conguraon/monitor
••Digital audio interfaces: AES/EBU (with word-clock in/out)
Oponal:
••Ethersound®interface
••Push to Talk (PTT) funcon with audio exit and GPI signals (patented)
••Very low impedance transformer outputs
The MRK960 is a professional dual diversity receiver for wireless microphones recepon especially designed
for broadcast producon, live stages, theatres and top professional applicaons.
It’s winning performances are:
•High immunity on strong rf environment
•Huge switching bandwidth
•High audio performances and exibility thanks to the digital processors
•High reliability and durability
One of the milestones in the design of the MRK960 is high reliability: most of the circuitry of the receiver is
independent one from each other.
Here below a schemac with an overview of main receiver funcons.
Starng from the antenna inputs, each antenna could be indipendently powered from a single power regula-
tor monitored from the microcontroller.
For each antenna the RF signal is splied in the receiver 1 and in the receiver 2 (antenna A and antenna B)
with a wide band splier. In this way any one receiver could be tuned in any frequency of the switching range
(370 MHz).
Receiver 1 and 2 are true diversity receivers: each one is made of two receivers tuned on the same frequency,
hereaer called secon A and secon B. The receiver 1 secon A and the receiver 2 secon A are connected
to the antenna A, the receiver 1 secon B and the receiver 2 secon B are connected at the antenna B.
Each receiver has its own demodulated signal and its own RSSI signal (Receiver Signal Strenght Indicaon); a
microcontroller select or combine signals from secon A & B to have the best audio. The demodulated signal
ows to the digital audio processor.
Pag. 5
MRK960 dual true diversity receiver
MRK960: main block diagram
Receiver - 1- A
Receiver - 1- B
Receiver - 2- A
Receiver - 2- B
True Diversity
Control Rx 1
True Diversity
Control Rx 2
Communic.
and control
interface
Receiver supervisor
microcontroller
and user interface
Front panel
Digital
output
A
B
Antenna inputs
Line 1
Line 2
Com Rx 1
Com Rx 2
AES3 Output
INFRARED
USB
Digital
audio
processor
Analogue
output
PTT
output
Ear-ph Left
Ear-ph Right
Ear-
phone
work clock
Ethersound
Ethernet
The data sub carrier is digitally ltered to a very selecve equivalent lter (bandwidth 3Hz). Each lter has its
own data demodulator, one for medium speed data detecon at the output of the rst lter and one at low
speed data detecon at the output of the second lter. All the two demodulators are connected to the super-
visor micro controller for the data baery detecon and signalling.
Digital audio processor(for each receiver): the demodulated signal is ltered by an an aliasing low pass lter
and then converted in the digital domain with a 96KHz 24bit audio A/D converter. The digital signal processor
(DSP), working in double precision, replicates all the analog funcons with very high accuracy, ultra low distor-
on and without typical analog problems like components tolerances or long term or temperature dris etc.
The high speed audio algorithms maintains the audio delay at about 0.390 milliseconds, making it ideally for
live events and to keep audio delay as short as possible. The DSP unit also lters and demodulates the data
carrier and communicates all the parameters and informaons to the supervisor micro controller. The audio
output goes to the digital outputs (AES3) or is converted in the analog domain with a high quality 24 bits
96KHz D/A converter and an an-aliasing lter.
The analogue audio signal is routed in three parallel ways, LINE, COM and HEADPHONE MONITOR amplier.
The HEADPHONE MONITOR amplier is controlled by the buons on the front panel and by the volume knob.
The monitor output depends on the squelch and on the tone squelch only in the TSQ ON selecon. In TSQ OFF
and in TSQ ADV the monitor output is muted only by the squelch control.
The two analogue audio ways, LINE and COM, has the same audio quality and are controlledy by the “Tone
squelch matrix”. Each audio driver has a VCA for the so switching of the audio signal and the mung func-
ons, controlled by the supervisor microcontroller. Aer the VCA, an electronically balanced amplier drives
the output signal, directly or thru a very low impedance screened audio transformer (oponal). The audio
output without transformer could withstand up to +52 Vdc of phantom supply with no damage and up to
100V with transformer.
Pag. 6
MRK960 dual true diversity receiver
DEA BC
A
B
C
D
E
Front panel functions
MRK960 allows an easy and quick conguraon using buons, push knobs and displays.
The front panel is funconally divided in the following secon:
Scan & Squelch: automac scan and squelch sengs;
Infrared: remote controlling and MIC setup through infrared interface.
Receiver 1: “receiver 1” conguraon and monitor of radio/deviaon levels.
Receiver 2: “receiver 2” conguraon and monitor of radio/deviaon levels.
Monitor: monitoring audio output on headphone jack (6.3mm - ¼”).
Power & Booster: powering ON or OFF the receiver and the antenna boosters
The funcon SCAN iniates an automac procedure for the choice of the less noisy channel in the selected
group of channels; the scan funcon measures the oor noise of all the channels of the selected group and
show the result in the display. This is a quick way to nd the best channels to use in the selected group. When
pushed the scan buon, it is needed to setup or conrm the group of channels for the scan.
SQUELCH iniates the automac procedure to setup the level of the squelch. This is an automac
way to quick setup the squelch for the current frequency. The transmier must be o, then push
SQ buon to let the system nd the opmal value. You can later accept, modify or discharge this
setup.
IR interface window: for communicaons between the MRK950 and a transmier. You have to
put the IR interface of the transmier, with the IR interface acve, in front of this window. This is
needed for example in the SYNC funcon.
Pag. 7
MRK960 dual true diversity receiver
RECEIVER 1 and RECEIVER 2
Area A: 3 LED bars:
• twobarsfortheRFlevelsindBuVolt(diversityA&Bantennalevel),
• FMmodulationofthereceivedchannel(modulationin%referredtothenominaldeviation)
• LIN:audioinlineoutputactive
• COM:audioincomoutputactive(optional)
• GPI:g.p.i.commandthruopto-isolatedrelay,active(optional)
• DATA:datasubcarrierfrommicrophonetransmitterdetected
Area B:display(256x64pixelsyellowOLEDdisplay)
Area C:3pushbuttons(membrane).
Thefunctionofeachbutton(upper,middleandlower)willbereadablefromthecontextmenuonthe
display.
Area D:Pushrotaryknobandlightindicator
Warning(YELLOW)andAlarm(RED)lightindicator:
• YellowFixed lightindicator(Warning)whenthereisnoaudioinboththeaudiooutputs(COMand
LINE)
• RedSlowBlinking lightindicator(LowAlarm)whenthebatterylevelofthetransmitteris≤25%
• RedFastBlinkinglightindicator(MediumAlarm)whenthebatterylevelofthetransmitteris≤12%
• RedFixedlightindicator (HighAlarm)whenabooster(AorB)hasashortcircuit.Moreoverthefol-
lowingmessageappearsontheOLEDdisplay:“OverCurrentonantennaA/B”
MONITOR
Monitor 1 and 2:it acvates monitor audio on jack output (6.3mm - ¼”) for receiver
1 and 2, respecvely (a green LED is lighted when audio is enable). Audio level can be
adjusted with the rotary knob. The red led (CLIP) indicates a clipping in the audio moni-
tor output.
POWER & BOOSTER
BOOSTER:it acvates antenna powering (boosters) with 12VDC (200mA max) and the
green LED is lighted. Blinking LED indicates a faulty condion, in this case power down
the device and check for short circuits or overloads in the RF cables or boosters.
Booster supply for antenna A and antenna B are indipendent, switchable from the RA-
DIO > OPTIONS menu.
POWER: ON/OFF square powering buon turns on/o the receiver. When in OFF posi-
on both phases are disconnected from power.
ABCD
Pag. 8
MRK960 dual true diversity receiver
All the basic informaon on the receiver status are readable in the main view of the LCD display.
The main view has the following info:
1 receivername,
2 currenttuningfrequency
3 currentchannelnumber
4 currentgroupnumberandgroupname
5 TVchannelusedforthecurrentfrequency
6 ToneSquelchcurrentsetup
7 AESworkclockstatus(sincefw1.1.0.Horabove)
8 Squelchlevel(microVolt)
9 NETconnectiontoahostPC(USBorEthernet)
10 AnalogaudiooutputlevelatnominalFMdeviation
11 statusoftheoutputlines(audioline,audiocom,gpi)anddetectionofthedigitaldatacarrier(i.e.transmit-
terbatterydatacarrierortonesquelch),
12 transmitterbatterychargestatus.
Thru the main menu on the LCD display and the LED bars for the RF level and modulaon the user has the
complete monitoring in real me of the wireless channel in use.
Menu tree
To access the conguraon menu of the receiver is necessary to press the rotary knob (at the right of the dis-
play). This allows you to access the main menu.
Pressing rt the rotary know shows a hidden window (area 11 the image
of the main view) with three main headings: “RADIO”, “AUDIO”, “SYNC“.
To acvate one of the items in the menu, press the corresponding buon
to the right of the display (see picture hereaer).
1
5
2
3
4
67 8 910
11
12
Press the knob
SYNCRADIO AUDIO
Pag. 9
MRK960 dual true diversity receiver
Radio menu
The rst item on the menu tree is “RADIO”. Pressing the upper buon (RADIO), you go at the RF funcons
menu of the receiver, as shown below:
Pag. 10
MRK960 dual true diversity receiver
Chan-Group
The CHANNEL-GROUP item enables the user to edit channel, channel group and frequency of the selected
items. Change, rotang the knob, the channel or the group of channels and conrm or exit with the buons.
To edit the frequency of selected channel, press the middle buon and change it with the knob. Press the
knob to move between MHz and KHz. Conrm or exit with the buons.
As shown in the above picture, the display area has 3 rows with:
1] Channel number (0 to 60) and Channel frequency (in
25kHz step)
2] Group number (1 to 40) and group name (8 char.)
3] Group descripon (30 char.)
The MRK960 has 40 groups of 60 channels each. Normally this is too much for wireless microphones applica-
ons.
Connecng with computer with WISYCOM MANAGER soware, it is possible to hide single channels or even
complete groups of channels: once hidden those items are not shown anymore on the channels or groups
selecon. To show channels or groups hidden use again the WISYCOM MANAGER soware.
Using this soware it is also possible to lock channels or groups. When a channel is locked, it is not possible to
change the frequency from the front panel of the receiver. Locking a group means that all channels are locked.
When a channel or a group are locked, at the le of the group name in the Chan-Group menu will appear a
lock icon as shown in the picture below. When the lock picture is shown, the central buon is not displayed,
thus changing frequency is not possible.
Gr. name
The second item on the radio menu is GROUP NAME; with
this funcon is possible to assign or change a name to a
group of channel. This short name (8 character) is displayed
at the right of the group number in the main display view.
First chose the the group and then press the knob. You will
be able to edit any character of the group name rotang the knob. Push the knob to edit the next character.
Conrm or exit with the buons.
Squelch
The SQUELCH funcon allows to assign a value at the squelch
of the receiver. Rotang the knob it is possible to change cur-
rent squelch level from OFF (it means no audio squelch) to
1mV. Pressing the knob you could setup the desired level and
also congure you measurement unit between microVolts
and dBµV. At the end conrm or exit with the buons. There is also an automac procedure to set up the
squelch level, it will be discussed later in this document at the Autoset SQUELCH item.
Pag. 11
MRK960 dual true diversity receiver
Walk test
The WALK TEST funcon records the RF level of the two antenna inputs, separately, for a total me of 90 sec-
onds. Using the rst buon, it is possible to choose what to plot: the rf level of the antenna A or B, the Max
value between antenna A and B or both antenna levels separately. Press START and walk on your area with a
wirelss MIC (transming at the current frequency) while receiver records all received RF levels. At the end of
the sweep me it is possible to have a look on the graph and check if there are some “hole of RF signals” and
evaluate your wireless coverage.
Finally push the 3rd buon (EXIT) to leave this fucnon. As “rule of the thumb”, the signal coverage of the
stage could be considered good if, in all the stage, the signal “MAX AB” is never lower than 10µV or 20dBµV.
The plot in the picture, shows a very low coverage with some areas not covered by the two receiving antennas.
In this case probably the posion of the antennas must be changed and/or the gain of the boosters adjusted.
Note:theunitforRFlevelisthesamechosenforthesquelchlevel(dBuVolt or uVolt)
Name
The opons NAME allow you to change the name of the receiver. This is the name displayed in the top of the
display in the main view and is the name sent to the transmier with the sync funcon (for transmiers with
this advanced capability).
Use the knob to change the name and the buons to save
or exit from the funcon (12 alphanumeric characters: A-Za-
z0-9, case-sensive).
Display brightness allows to change the brightness of the display from 1 to 15 level (step 1 dB).
Display LOW Timeout [0÷120 sec] controls display behaviour as follow:
- Aer a rst mer meout without any input on the receiver (buons or wheel) the display gost on “RE-
DUCED BRIGHTNESS MODE”
- Aer another mer meout, the receiver goes into “LOW BRIGHTNESS MODE”, and leaves current menu to
be back on TOP MENU.
Display OFF Timeout: [OFF, 5÷240 min] aer the meout without any input on the receiver (buons or wheel)
the display switches o. (OFF=display always power on.)
NOTE: Each receiver has indipendent display parameters.
allows to select which antenna input (A, B or A+B) has to be powered on by pressing BOOSTER buon
from the front panel.
Pag. 12
MRK960 dual true diversity receiver
Info
the INFO funcon shows many important features or informaon of your MRK960 receiver:
»Range:infoaboutthefrequencylimitsofthereceiver.
»Temp:internaltemperatureofMRK960.
»Ant.AandAnt.B:themeasureoftheoutputcurrentforpoweringtheboostersconnectedonantenna
inputAeBconnectors.Thecurrentmeasurementisactiveonlywhenboostersareswitchedon.The
boostersupplyvoltageis12Volts.
»Serial:serialnumberoftheMRK960receiver.
»Errors:numberofinternalerrorsdetectedbythereceiver,usefulforserviceormaintenance.
»App:releaseversionofthemainapplicationrmware.
»Appbl:releaseversionofthemainapplicationrmwareupdater(bootloader).
»Netw:releaseversionofthenetworkcommunicationrmware.
»Netwbl:releaseversionofthenetworkcommunicationrmwareupdater(bootloader).
»DSP:releaseversionoftheDSPrmware.
Note:thecompletesoftwareandhardwarestatusisdisplayedswitchingONthereceiverwithaknob
pressed.Pressthisknobasecondtimetoexitthisfunction.
RF test
This menu gives some informaon of the RF signal measured.
Note:lowlevelofTsq.modmeansthattheTonesquelchisnotdetectedfromthereceiver
The FACTORY PRESET resets the following setups to factory defaults: tone squelch (OFF), noise reducon
system (ENR), audio output level (12dBu), cal tone (OFF), audio matrix, booster supply (OFF) and headphone
selecon (OFF).
Note:receivernames,frequencies,groupsorchannelsinformationareNOTchanged.
Pag. 13
MRK960 dual true diversity receiver
Audio menu
The second item on the menu tree is “AUDIO”.
Noise Red
The NOISE REDUCTION SYSTEM is used to select your current noise reducon system in the audio path.
Thanks to the DSP board, it is possible to choose dierent types of audio processors. MRK960 supports, as
standard conguraon, the following type of “Companding system”:
NONE-d50 NO compander, 50µs de-emphasis
Analogue baery data & PTT (Wisycom®)
NONE-d75 NO compander, 75µs de-emphasis
Analogue baery data & PTT (Wisycom®)
ENR-WISY Wisycom ENR compander, noise opmized
Digital baery data & P (Wisycom®)
ENC-WISY Wisycom ENC compander, voice and high-delity opmized
Digital baery data & P (Wisycom®)
Use the buons to save or exit from this funcon. Depending on selected NOISE REDUCTION SYSTEM, tone
squelch funcon and transmier baery status could be enabled or disabled (since not all the wireless mi-
crophones have this enhanced funconality).
Tone sq.
The TONE SQUELCH funcon is an advanced funcon (whose behaviour depends on selected noise reducon
system). This chapter explains TONE SQUELCH operaons when associated to a Wisycom wireless microphone
with the ENR-WISY or ENC-WISY as acve noise reducon system. Other types of wireless microphones could
have dierent behaviour or could not work properly. Here-aer the complete tone squelch funcon, when-
ever the receiver does not have all the opons installed, some funcons will be hidden.
Pag. 14
MRK960 dual true diversity receiver
The tone squelch selecon could be OFF, ON or ADV (advanced). Aer the SAVE of tone squelch selected, a
CONFIG submenu appears on the right. Enter on the CONFIG submenu to change the seng of the choosen
Tone Squelch (see matrix below). With the knob and the buons, it is possible to choose, for any one of the
three TSQ modes, the status of the audio outputs LINE and COM and in the TSQ ADV mode it is possible to
choose the status of outputs LINE, COM and GPI, when the transmier PTT buon is released or pushed. The
dot in the circle on the le of the display shows the actual seng for the tone squelch funcon.
Tone squelch OFF enables the audio output on LINE and
COM (if present) connectors always, it could be muted only
by the squelch on RF signal (the RF squelch has always prior-
ity).
Tone squelch ON enables the audio output on LINE and COM
(if present) only if the transmier sends the correct iden-
caon tone signal (tone squelch).
Tone squelch ADV (with or without PTT opons), on micro-
phone transmiers, gives more possibilies of audio roung
and GPI signalling.
Note:thetonesquelchcouldnotsubstitutethesquelchon
theRFsignallevel.ForthebestperformanceofthereceiveritisbettertousetheSQUELCH&TONE
SQUELCHtogether.
With this parameter, it’s possible to enable a delay on the acvaon of the audio when the tone squelch is
ON. If the tone squelch is set to ADV (advanced), this delay is not enabled.
This delay is set to 500ms by default but it’s possible to change it from 100 to 2000ms (step 100ms) or OFF.
When the delay is set, the output audio is enabled only if the tone squelch is detected during all delay me.
It permits to avoid that a brief strong interference, with the same freq of the tone squelch, enables the audio
in output.
Note:thisfeatureisavailablefromrmwareversion1.1.0.w.InthepreviousFWversionsthedelay
wasforzedtoOFFandnotcongurablebytheuser.
The OUT LEVEL funcon allows the adjustment of the audio level on the LINE and COM balanced outputs. The
nominal level, used also in the technical specicaons of the receiver, is 12dBu at nominal modulaon and
could reach 18dBu to 20dBu in clipping. This level could be too high for some audio mixing units, so with the
out level funcon it is possible to reduce the nominal level from 12dBu to 6dBu or 0dBu. This seng is unique
for LINE and COM.
Note:theaudiooutputlevelcouldbefurtherreducedby30dBwithaswitchbelowtheXLRoutputcon-
nector,intherearpanel.
Pag. 15
MRK960 dual true diversity receiver
Cal. tone
The CALIBRATION TONE funcon generates a tone (at specic frequecies) or a sweep of tones at the audio
outputs. Change the value of the following parameters according to the desiderable calibraon tone:
»Mode:selectthetypeofcalibrationtone(Tone/Sweep)
»Out:selecttheoutputsforthecalibrationtone(onlyLINE,onlyCOMorLINEandCOMtogether)
»Level:selectthelevel(-6dBFSor-26dBFS)
»Frequency(onlyforTone):444/442/440/1000Hz
»Freqstep(onlyforSweep):ocatve÷1/24octave
»Timestep(onlyforSweep):1sec/100ms
With the buons it is possible to start, stop and exit from the tone generaon. The output not selected for the
tone generaon will be muted.
When the tone is acve at least in one output, the led bar of the deviaon indicates the level selected.
This opon is normally set to OFF. Set to YES when you need:
••to increase the reliability in case of failure
••to increase the reliability in case of transmier baeries empty
••to increase the security against fading due to reecons on the radio link
When a receiver is set to frequency diversity YES, the audio output is calculated from the best RF signal re-
ceived from the two receivers.
WARNING: two transmiers tuned with the two receivers must be placed on the same audio source and must
have the same conguraon (ex. gain, tone squelch seng, RF power, distance from the audio source….).
NOTE: the Noise reducon can be dierent.
Note:Frequencydiversityineachreceivercanbesetindependently.
Note:Withfrequencydiversityenabled(settoYES),theToneSquelchmenuallowsonlythesettingop-
tionsONandOFF(theADVoptionisnotallowed).
Frequency diversity example:
RX1 tuned on f1 with Frequency Diversity set to YES.
RX2 tuned on f2 with Frequency Diversity set to NO.
Pag. 16
MRK960 dual true diversity receiver
TSQ detect alarm
This opon is normally disabled.
If enabled, the receiver shows an alarm “Tone squelch not detected” in case of absence of tone squelch. The
alarm appears when the audio output becomes suddenly muted in the following condions:
••“AUDIO>Tone sq” set to ON or ADV
••RF level > squelch
••Tone squelch not detected
The SYNC funcon, selected from the main menu with the lower buon, is useful to tune a transmier on
the same frequency of the receiver via the IR interface. Before starng the sync funcon tune the receiver
on desired channel, manually or using the SCAN ulity. Aer this, enable the IR interface on the transmier.
Now press the knob and the lower buon to start the SYNC funcon. Keep the IR window of the transmit-
ter in front of the IR window of the receiver and, as soon as the connecon is done, the receiver will send to
the transmier all the informaon needed. If the operaon is not possible, (i.e. the frequency range of the
transmier is not compable with the frequency of the receiver), the display will show an error message. If
the transmier has the funcon “NAME” enabled, when the sync funcon is completed it will show the same
name of the syncronized receiver.
Audio output RX1 is calculated from the best RF signal received from the two receivers.
Audio output RX2 is calculated from the RF signal received from RX2.
Pag. 17
MRK960 dual true diversity receiver
The SQUELCH AUTOSET funcon helps the user to set the squelch level of the receiver at a good level for the
selected channel.
Aer pressing the SQ autoset buon, the two receivers ask to switch o the transmier and
then, aer the user conrmaon (on one receiver or all the two receivers at the same me), it
starts to measure the noise in the selected channel.
A few me later, aer some calculaon, the receiver proposes the new squelch level.
The user could then accept, refuse or modify it by means of the buons and of the knob.
Note:duringtheAutosetSQUELCHfunctionitisnotpossibletochangetheunitofthesquelchvoltage.
SCAN
The SCAN funcon is very useful to discover the best channels to use (the channels with lower RF noise) in
the selected group. Aer pressing the SCAN buon, both receivers are ready to start with the SCAN funcon.
It is possible to select the receiver 1 or the receiver 2 or both (i.e. simultaneously scan on dierent groups).
With the rst menu on the display it is possible to choose the group of channels for the scan and, pressing
the knob, is possible to dene a reference line drawing in the nal scan result graphic, just for user reference.
Pressing the knob the focus change between REF LINE and GROUP.
Pressing the START buon, an alert window remind the user to switch o all the transmiers before starng
the SCAN, press START again and the SCAN funcon will start. At the end of the analisys, on the display it is
possible to see the graph of the RF levels measured in each channel and, rotang the knob, it is possible to
move the marker on the boom of the graph just to see the channel number and the RF level measured for
that channel.
Pressing the knob it is possible to have a graph in rank order instead of channels order, so, it is very simple in
rank order to nd the less noisy channels because they are in the le part of the graph.
The marker is always acve rotang the knob.
Pressing the knob the graph changes between rank order to channel order again.
For terminang the SCAN funcon, press the lower buon on the right of the display.
Pag. 18
MRK960 dual true diversity receiver
In the above picture a typical graph of the scan funcon (only the graph area of the display). This graph, or-
dered by channel numbers, shows the RF levels in dBµV for each channel in the selected group (i.e. Ch: 00).
Rotang the knob the small arrow cursor moves from a channel to the next one; on the right of the graph it is
possible to see the rank of the channel selected by the cursor, its number, its frequency and the RF level. Press-
ing the knob the order of the graph became the rank, not the channel number. In this way it is more simple to
choose channels with lower RF noise, they are in the le part of the graph. See at the picture below:
In this graph the channels are ordered by rank. Turning the knob it is possible to change the channel and read-
ing its number, frequency and level of RF noise.
The horizontal dashed line is the squelch level set before starng the scan.
Connecng an headphone at the monitor output, is possible to ear the signal in the channel selected by the
knob. If the RF signal is below the squelch level, the upper buon near the display disable/enable the squelch
so the audio output is enabled also for weak RF signal.
The SELECT buon is the exit from the SCAN funcon tuning the receiver on the selected channel, the EXIT but-
ton exits from the SCAN funcon leaving the receiver channel unchanged.
Pag. 19
MRK960 dual true diversity receiver
OPERATING INFORMATIONS
Two RF level led bars for each receiver indicate measured RF level at the antenna input of the receiver in the
selected channel. For a typical diversity recepon it is a good starng point to consider that the two signals
should have the same average level over me, but this could be dierent while moving the transmier on the
stage. The important issue is that moving the transmier on the stage, the diversity has to work switching
from one receiver to the other receiver as indicated by the two blue leds on the top of the bars. When the
RF levels of the two inputs have similar level, the diversity control enable the two receiver at the same me,
further increasing the S/N rao at the audio output.
The third led bar of each receiver indicates current channel modulaon as percentage of nominal deviaon
(not the audio output level). The dierence between modulaon and audio level is because normally there is
a preemphasis on audio transmission and some manufacturer uses dierent compression values and dierent
audio frequency equalizaon. Therefore to have the maximun eciency of the radio channel it is important
to use the highest modulaon bandwidth possible, in respect to the dynamic range of the audio signal and the
manufacturer specicaons. If the receiver MRK950 has the DSP board opon, the scale of the modulaon
will be changed according to the nominal modulaon of the type of microphone and manufacturer selected
in the NOISE REDUCTION SYSTEM. The modulaon led bar is blank when the squelch and/or the tone squelch
opens the audio output circuit (or if there is no modulaon on the transmier, of course). Adjust the gain of
the audio chain in the transmier to have in the maximum modulaon peaks the 100% of modulaon band-
width, leaving the next 6dB of modulaon margin before clipping (red PEAK led) for extra sound pressure
margin. If the audio level is not exactly known, be conservave and adjust the microphone gain in a lower
posion to avoid clippings during the working session.
On the main display of each receiver is always well visible the baery status of the transmier (area 12 of the
main view). The resoluon of the indicaon depends on the transmier. Wisycom transmiers send 8 levels
of baery charge status, other competors 6 or 4 or 3 level (full, half, empty).
When the transmier is a Wisycom, the display of the baeries indicate the correct icon and the percentage
of the charge but, when the charge reach the 25% the baery area on the display became ashing, when the
charge reach the 12,5%, the illuminaon of the display is ashing to give an high visibility alarm to the user.
Pag. 20
MRK960 dual true diversity receiver
1Mainsoutput.Donotconnectmorethan8
units.
Mainssocketinput.
Mainsfuse(2A-T).
EthernetconnectorRJ45forLANconnectionof
thereceiver.Theledsontheconnectoreindi-
catethestatusoftheconnection(LinkandAc-
tivity).
AES/EBU XLR 3 pin output connector, digital
audio output transformer isolated, balanced.
ThisispartoftheAES/EBUoptionalboard,to-
ghetherwith6,7and22.Hereitispossibleto
install dierent option like Ethersound© I/O.
(Optional)
Wordclockinputforexternalsyncronizationof
digital audio output.
75ohmsterminationswitchforwordclockin-
put.
AntennaBinput,BNCconnector,DCoutputfor
boosterpowersupply.
XLR3pinmaleconnector,COMaudiooutputof
thereceiver2,balanced.(Optional)
XLR3pinmaleconnector,LINEaudiooutputof
thereceiver2,balanced.
GPIoutputofthereceiver2,1/4”(6,3mm)ste-
reojacksocket.(Optional)
XLR3pinmaleconnector,COMaudiooutputof
thereceiver1,balanced.(Optional)
XLR3pinmaleconnector,LINEaudiooutputof
thereceiver1,balanced.
GPIoutputofthereceiver1,1/4”(6,3mm)ste-
reojacksocket.(Optional)
AntennaAinput,BNCconnector,DCoutputfor
boosterpowersupply.
Unbalanced LINE audio output of receiver 1,
1/4”(6,3mm)stereojacksocket.
Switchesforshortingthepin1oftheXLRcon-
nectorsofreceiver1tothereceivergroundor
not.
Switches for attenuating the audio output le-
velontheXLRconnectors.Theattenuationis
30dB.
Unbalanced LINE audio output of receiver 2,
1/4”(6,3mm)stereojacksocket.
Switchesforshortingthepin1oftheXLRcon-
nectorsofreceiver2tothereceivergroundor
not.
Switches for attenuating the audio output le-
velontheXLRconnectors.Theattenuationis
30dB.
Wordclockoutput,fordaisychainconnection.
BNCconnector.(Optional)
LINKconnection,forcascadeconnectionofre-
ceivers,forremotecontrolfunctionality.USB-A
connector.
USB-B connector for PC connection if this
MRK960isasubnetcontroller.IfthisMRK960
ispartofasubnet,thisconnectormustbecon-
nected to the LINK connector of the previous
MRK960.
Productidenticationlabel.
AntennaAoutput,BNCconnector(forantenna
splitting)
AntennaBoutput,BNCconnector(forantenna
slipping)
Rear panel
2
26
4512 13 14 15
1627
11
3987610
17
18
192023 22 2125 24
1
10
20
5
4
3
2
9
8
7
6
14
13
12
11
15
26
25
24
23
22
21
19
18
16
17
27
1
Table of contents
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