WisyCom MRK 950 EX Instruction Manual

INSTRUCTION MANUAL

DUAL HIGH PERFORMANCE WIRELESS MICROPHONE RECEIVER

FULL UHF BAND COVERAGE UP TO 370 MHZ

MRK950 s.n.: _______________
FW rel.: _______________
Options: _______________

Pag. 2

MRK950 dual true diversity receiver

Pag. 3

high performances microphone system

Brief description

The MRK950 is a high performance microphone sys­tem suitable for broadcast and high professional
application. Thanks to its exceptional selectivity and
intermodulation immunity, MRK950 is able to oper­ate even in the presence of very high DVTB-T trans­mitter’s signals.
The extreme bandwidth agility of 370 MHz al­lows you to always nd & work on the best frequen­cies available. MRK 950 is designed to be:

• “easy & quick to use” thanks to automatic setup

functions (i.e. frequencies, squelch), remote con­guration utilities (USB/Ethernet), a display with

intuitive context menu navigation.

• “extremely exible”, with an incredible frequen-
cy agility of 330 MHz; more than one rack can be

connected together thru a simple USB cable to act
a multi-channel receiver. Moreover the DSP board

allows the units to work with several digital au-

dio outputs (i.e. AES/EBU, Ethersound, …), with

multi-companding compatibilities and other digital
features.

• “best in class performances”, thanks to the lat-
est Wisycom technology the unit has extreme RF

sensitivity and immunity and superb audio quality.

• “a durable & upgradable investment”, thanks
to the very robust design (aluminum housing) and
the possibility of upgrade/enhance units perfor-

mances with simple slot in card (pc-like thru the

DEXB expansion bus)

Moreover MRK 950 system is already set up for the
exclusive PTT function (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 “off-air” directly with the technical
team. Then all PTT’s MICs can be connected
in pre-fading allowing a clever intercom
setup.

taBle of contents

BRIEF DESCRIPTION . . . . . . . . . . . . . . . . . . . 3

Safety instruction . . . . . . . . . . . . . . . . . . . . . . . . 4

Main features . . . . . . . . . . . . . . . . . . . . . . . . . . 5

TECHNICAL DESCRIPTION . . . . . . . . . . . . . . . 5

USER GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Front panel functions . . . . . . . . . . . . . . . . . . . . . 7

SCAN & SQUELCH & INFRARED . . . . . . . . . . . . . 7

RECEIVER 1 and RECEIVER 2. . . . . . . . . . . . . . . 7

MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

POWER & BOOSTER . . . . . . . . . . . . . . . . . . . . . 7

LCD display: Main view . . . . . . . . . . . . . . . . . . . 8

Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Display view:

buttons logical & schematic diagram . . . . . . . . . 8

Radio menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chan-Group . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Gr. name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Walk test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

OPTIONS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

LCD contr. & LCD light. . . . . . . . . . . . . . . . . . . 10

Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Restore preset . . . . . . . . . . . . . . . . . . . . . . . . 10

Audio menu . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Tone sq. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Out level . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Cal. tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Sync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

SQ (squelch autoset) . . . . . . . . . . . . . . . . . . . . 11

SCAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OPERATING INFORMATIONS . . . . . . . . . . . . . . . 13

RF Level led bars . . . . . . . . . . . . . . . . . . . . . . 13

Modulation led bar . . . . . . . . . . . . . . . . . . . . . 13

Battery indication . . . . . . . . . . . . . . . . . . . . . . 13

Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

RECEIVER CONNECTION . . . . . . . . . . . . . . . . . . 15

Antenna Connection . . . . . . . . . . . . . . . . . . . . 15

Analog audio connection . . . . . . . . . . . . . . . . . 15

Digital audio AES/EBU. . . . . . . . . . . . . . . . . . . 15

Digital audio Ethersound

©. . . . . . . . . . . . . . . . . .

Link Ethernet 10/100 Mbit/s . . . . . . . . . . . . . . . .

USB connection . . . . . . . . . . . . . . . . . . . . . . . . .

NETWORK CONNECTION . . . . . . . . . . . . . . . . . . . .

Digital audio Ethersound

© . . . . . . . . . . . . . .16

Link Ethernet 10/100 Mbit/s . . . . . . . . . . . . . . 16

USB connection . . . . . . . . . . . . . . . . . . . . . . . 16

NETWORK CONNECTION . . . . . . . . . . . . . . . . . . 16

Technical specification. . . . . . . . . . . . . . . . . . . . 17

Options specications: . . . . . . . . . . . . . . . . . . 18

Pag. 4

MRK950 dual true diversity receiver

Safety instruction

• Read this safety instruction and the manual rst.

• Follow all instructions and information.

• 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 connection.

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 operating
temperature range.

• Mount the apparatus as indicated in the instruc-
tion, do not block side grids for air ventilation.

• If the external air lter is mounted, clean it regu-
larly.

• 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 autho-

rized or specied from the manufacturer.

• Do not supply more than 7 apparatus MRK950
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 disconnection 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
replacement parts or accessories from the manu­facturer.

• When replacement parts are needed, use only
replacement parts authorized from the manufac-

turer. Substitution 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 pro-
fessional 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 time. Reduce the pow­er or suspend the hearing in the case of any kind
of hearing problem.

Pag. 5

high performances microphone system

technical description

The MRK950 is a professional dual diversity receiver
for wireless microphones reception especially de­signed for broadcast production, live stages, the­atres and top professional applications.

It’s winning performances are:

• High immunity on strong rf environ-

ment

• Huge switching bandwidth

• High audio performances and exibility

with analog or digital processors

• High reliability and durability

One of the milestones in the design of the MRK950 is
high reliability: most of the circuitry of the receiver
is independent one from each other.

On next page a schematic with an overview of main
receiver functions.

Starting from the antenna inputs, each antenna

could be powered from a single power regulator
monitored from the microcontroller.

For each antenna the RF signal is splitted in the re-

ceiver 1 and in the receiver 2 (antenna A and an­tenna B) with a wide band splitter. In this way any
one receiver could be tuned in any frequency of the
switching range (typ. 240/330 MHz).

Receiver 1 and 2 are diversity receivers: each one is
made of two receivers tuned on the same frequency,

hereafter called section A and section B. The re-

ceiver 1 section A and the receiver 2 section A are
connected to the antenna A, the receiver 1 section

B and the receiver 2 section B are connected at the
antenna B.

Each receiver has its own demodulated signal and
its own RSSI signal (Receiver Signal Strenght Indi­cation); a microcontroller select or combine signals
from section A & B to have the best audio.

The demodulated signal is then splitted on two parts,

one part ows to the analog processor and the other
part ows to the digital audio processor (optional).

Main features

MRK 950 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 up to 370 MHz with tunables lters

(2 ch’s independent):

» MRK 950-L: 470/670 MHz (TV ch 21/45)
» MRK 950-M: 470/678 MHz (TV ch 21/46)
» MRK 950-I: 590/830 MHz (TV ch 36/65)
» MRK 950-H: 630/870 MHz (TV ch 41/70)

» MRK 950-X: 470/800 MHz (TV ch 21/62)

with internal active splitter

» MRK 950-w: 470/840 MHz (TV ch 21/67)

with internal active splitter

• 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)

• multi-companding compatibility

• future digital functionality enhancements.

• Balanced electronic AF output (low impedance

transformer-coupled optional)

• 2 USB’s connectors for conguration/monitor and
cascade rack connections

• Automatic scan for best channels, squelch and
other automatic setup

• Infrared interface (i.e. for system setup, micro-

phone programming)

• Automatic transmitter re-programming (thru infra-
red, sync function)

• Software to monitor/setup units and with spec­trum eld analysis

Optional:

• Ethernet 10/100 base Tx network interface for

conguration/monitor

• Digital audio interfaces:

• Ethersound

®

interface

• AES/EBU digital interface (with word-clock in/out)

• Push to Talk (PTT) function with audio exit and GPI

signals (patented)

• Very low impedance transformer outputs

Pag. 6

MRK950 dual true diversity receiver

MRK950: main block diagram

Receiver - 1- A

Receiver - 1- B

Receiver - 2- A

Receiver - 2- B

Diversity

microcontroller

Diversity

microcontroller

Analog

audio

processor

Analog

audio

processor

Digital

audio

processor

Communic.

networking

microcontr.

Receiver supervisor

microcontroller

and user interface

Front panel

Digital output

Antenna

bias

control

A

B

Antenna inputs

Line
Com
Line unbal.
GPI

Line
Com
Line unbal.
GPI

AES/EBU
word clock

Ethersound

USB

Ethernet

Link

Analog processor: the signal is ltered by a high
pass lter (30Hz) and then splitted in two different

circuits, the audio processor and the data signalling
subcarrier detection and demodulation. The audio
processor has these sections: the de-emphasis (50

microseconds), the low pass lter (20KHz), the ex­cludible ENR expander. The audio signal is now ready

for the audio output drivers.

Data signalling detection and demodulation:

the data subcarrier is ltered with a four sections
band pass lter with a bandwidth of about 50Hz, fol­lowed by an ultra narrow band crystal lter (3Hz).
Each lter has its own data demodulator, one for

medium speed data detection at the output of the

rst lter and one at low speed data detection at the
output of the second lter. All the two demodulators

are connected to the supervisor microcontroller for
the data battery detection and signalling.

Digital audio processor: the demodulated signal

is ltered by an anti aliasing low pass lter and then
converted in the digital domain with a 96KHz 24bit
audio A/D converter. The digital signal processor
(DSP), capable or 40 bits oating point operation,

replicates all the analog functions with very high ac­curacy, ultra low distortion and without typical an­alog problems like components tolerances or long
term drifts or temperature drifts etc. The high speed
audio algorithms implemented in assembler into the
MRK950 maintains the audio delay at about 700 mi­croseconds, 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 informations
to the supervisor microcontroller. The audio output

goes to the digital outputs board options (AES/EBU
or Ethersound) or is converted in the analog domain
with a high quality 24 bits 96KHz D/A converter and
an anti-aliasing lter.

Audio output drivers: the audio signal, selected
between the analog processor output and the digi­tal audio board codec output (depending on setup

dened into the active noise reduction system),

is splitted in three parallel ways, LINE, COM and
HEADPHONE MONITOR amplier.

The HEADPHONE MONITOR amplier is controlled by
the buttons 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 selec­tion. In TSQ OFF and in TSQ ADV the monitor output
is muted only by the squelch control.

The two ways, LINE and COM, are identical and the

audio quality is exactly the same. Each audio driver
has a VCA for the soft switching of the audio signal

and the muting functions, controlled by the supervi-

sor microcontroller. After the VCA, an electronically
balanced amplier drives the output signal, directly

or thru a very low impedance screened audio trans­former (optional). The audio output without trans­former could withstand up to +52 Vdc of phantom
supply with no damage and up to 100V with trans­former.