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 exceponal selecvity and intermodulaon immunity, MRK960 is able to operate even in
the presence of very high DVTB-T transmier’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 automac setup funcons (i.e. frequencies, squelch), remote conguraon
ulies (USB/Ethernet), a display with intuive context menu navigaon.
••“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-
ibilies and other digital features.
••“best in class performances”, thanks to the latest Wisycom technology the unit has extreme RF sensivity
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 funcon (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 instrucon and the manual rst.
••Follow all instrucons and informaon.
••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 connecon. 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 operang tempera-
ture range.
••Mount the apparatus as indicated in the instrucon, do not block side grids for air venlaon.
••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 qualied 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 specied 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 disconnecon 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-
stuon 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 acve splier
••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 compability
••future digital funconality enhancements.
••Balanced electronic AF output (low impedance transformer-coupled oponal)
••2 USB’s connectors for conguraon/monitor and cascade rack connecons
••Automac scan for best channels, squelch and other automac setup
••Infrared interface (i.e. for system setup, microphone programming)
••Automac transmier re-programming (thru infrared, sync funcon)

Pag. 4
MRK960 dual true diversity receiver
••Soware to monitor/setup units and with spectrum eld analysis
••Ethernet 10/100 base Tx network interface for conguraon/monitor
••Digital audio interfaces: AES/EBU (with word-clock in/out)
Oponal:
••Ethersound®interface
••Push to Talk (PTT) funcon with audio exit and GPI signals (patented)
••Very low impedance transformer outputs

The MRK960 is a professional dual diversity receiver for wireless microphones recepon especially designed
for broadcast producon, live stages, theatres and top professional applicaons.
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 schemac with an overview of main receiver funcons.
Starng 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 splied in the receiver 1 and in the receiver 2 (antenna A and antenna B)
with a wide band splier. 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,
hereaer called secon A and secon B. The receiver 1 secon A and the receiver 2 secon A are connected
to the antenna A, the receiver 1 secon B and the receiver 2 secon B are connected at the antenna B.
Each receiver has its own demodulated signal and its own RSSI signal (Receiver Signal Strenght Indicaon); a
microcontroller select or combine signals from secon 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 selecve equivalent lter (bandwidth 3Hz). Each lter has its
own data demodulator, one for medium speed data detecon at the output of the rst lter and one at low
speed data detecon at the output of the second lter. All the two demodulators are connected to the super-
visor micro controller for the data baery detecon 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 funcons with very high accuracy, ultra low distor-
on and without typical analog problems like components tolerances or long term or temperature dris 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 informaons 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 amplier.
The HEADPHONE MONITOR amplier is controlled by the buons 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 selecon. 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 mung func-
ons, controlled by the supervisor microcontroller. Aer the VCA, an electronically balanced amplier drives
the output signal, directly or thru a very low impedance screened audio transformer (oponal). 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 conguraon using buons, push knobs and displays.
The front panel is funconally divided in the following secon:
Scan & Squelch: automac scan and squelch sengs;
Infrared: remote controlling and MIC setup through infrared interface.
Receiver 1: “receiver 1” conguraon and monitor of radio/deviaon levels.
Receiver 2: “receiver 2” conguraon and monitor of radio/deviaon levels.
Monitor: monitoring audio output on headphone jack (6.3mm - ¼”).
Power & Booster: powering ON or OFF the receiver and the antenna boosters

The funcon SCAN iniates an automac procedure for the choice of the less noisy channel in the selected
group of channels; the scan funcon 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 buon, it is needed to setup or conrm the group of channels for the scan.
SQUELCH iniates the automac procedure to setup the level of the squelch. This is an automac
way to quick setup the squelch for the current frequency. The transmier must be o, then push
SQ buon to let the system nd the opmal value. You can later accept, modify or discharge this
setup.
IR interface window: for communicaons between the MRK950 and a transmier. You have to
put the IR interface of the transmier, with the IR interface acve, in front of this window. This is
needed for example in the SYNC funcon.

Pag. 7
MRK960 dual true diversity receiver
RECEIVER 1 and RECEIVER 2
Area A: 3 LED bars:
• twobarsfortheRFlevelsindBuVolt(diversityA&Bantennalevel),
• FMmodulationofthereceivedchannel(modulationin%referredtothenominaldeviation)
• LIN:audioinlineoutputactive
• COM:audioincomoutputactive(optional)
• GPI:g.p.i.commandthruopto-isolatedrelay,active(optional)
• DATA:datasubcarrierfrommicrophonetransmitterdetected
Area B:display(256x64pixelsyellowOLEDdisplay)
Area C:3pushbuttons(membrane).
Thefunctionofeachbutton(upper,middleandlower)willbereadablefromthecontextmenuonthe
display.
Area D:Pushrotaryknobandlightindicator
 Warning(YELLOW)andAlarm(RED)lightindicator:
• YellowFixed lightindicator(Warning)whenthereisnoaudioinboththeaudiooutputs(COMand
LINE)
• RedSlowBlinking lightindicator(LowAlarm)whenthebatterylevelofthetransmitteris≤25%
• RedFastBlinkinglightindicator(MediumAlarm)whenthebatterylevelofthetransmitteris≤12%
• RedFixedlightindicator (HighAlarm)whenabooster(AorB)hasashortcircuit.Moreoverthefol-
lowingmessageappearsontheOLEDdisplay:“OverCurrentonantennaA/B”
MONITOR
Monitor 1 and 2:it acvates monitor audio on jack output (6.3mm - ¼”) for receiver
1 and 2, respecvely (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 acvates antenna powering (boosters) with 12VDC (200mA max) and the
green LED is lighted. Blinking LED indicates a faulty condion, 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 buon 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 informaon on the receiver status are readable in the main view of the LCD display.
The main view has the following info:
1 receivername,
2 currenttuningfrequency
3 currentchannelnumber
4 currentgroupnumberandgroupname
5 TVchannelusedforthecurrentfrequency
6 ToneSquelchcurrentsetup
7 AESworkclockstatus(sincefw1.1.0.Horabove)
8 Squelchlevel(microVolt)
9 NETconnectiontoahostPC(USBorEthernet)
10  AnalogaudiooutputlevelatnominalFMdeviation
11  statusoftheoutputlines(audioline,audiocom,gpi)anddetectionofthedigitaldatacarrier(i.e.transmit-
terbatterydatacarrierortonesquelch),
12  transmitterbatterychargestatus.
Thru the main menu on the LCD display and the LED bars for the RF level and modulaon the user has the
complete monitoring in real me of the wireless channel in use.
Menu tree
To access the conguraon 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 acvate one of the items in the menu, press the corresponding buon
to the right of the display (see picture hereaer).
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 buon (RADIO), you go at the RF funcons
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, rotang the knob, the channel or the group of channels and conrm or exit with the buons.
To edit the frequency of selected channel, press the middle buon and change it with the knob. Press the
knob to move between MHz and KHz. Conrm or exit with the buons.
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 descripon (30 char.)
The MRK960 has 40 groups of 60 channels each. Normally this is too much for wireless microphones applica-
ons.
Connecng with computer with WISYCOM MANAGER soware, 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
selecon. To show channels or groups hidden use again the WISYCOM MANAGER soware.
Using this soware 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 buon is not displayed,
thus changing frequency is not possible.
Gr. name
The second item on the radio menu is GROUP NAME; with
this funcon 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 rotang the knob. Push the knob to edit the next character.
Conrm or exit with the buons.
Squelch
The SQUELCH funcon allows to assign a value at the squelch
of the receiver. Rotang 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 congure you measurement unit between microVolts
and dBµV. At the end conrm or exit with the buons. There is also an automac procedure to set up the
squelch level, it will be discussed later in this document at the Autoset SQUELCH item.