Main Features; Technical Description - WisyCom MRK 950 EX Instruction Manual

high performances microphone system

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 filters
(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 process-
ing) 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 configuration/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 spec-
trum field analysis
Optional:
• Ethernet 10/100 base Tx network interface for
configuration/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
t
echnical description
The MRK950 is a professional dual diversity receiver
for wireless microphones reception especially de-
signed for broadcast production, live stages, the-
atres and top professional applications.
It's winning performances are:
High immunity on strong rf environ-
•
ment
Huge switching bandwidth
•
High audio performances and flexibility
•
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 an-
tenna 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.
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 Indi-
cation); 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 flows to the analog processor and the other
part flows to the digital audio processor (optional).
The re-
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