msr 918 - true-diversity receiver module - aei k

msr 918 - true-diversity receiver module - aei k
WIRELESS-MICROPHONE SYSTEMS
MSR 918 - TRUE-DIVERSITY RECEIVER MODULE
front panel
back panel
10
1
2
6
3
7
4
8
5
9
The MSR 918 receiver module is the result of the most advanced
wireless-microphone technology, necessary when working in the
new DVB-T era. Besides the very high sensitivity and superb
sharp selectivity, it presents also an outstanding freedom from
intermodulation and interferences.
It allows the remote
monitoring of the TX battery lifetime and it is endowed with the
“digital sub-carrier tone-squelch”. These features are obtained by
a special sub-carrier (which frequency has been proprietary
chosen in 32 KHz range) digitally modulated in word, that is
generated by the last-generation Wisycom transmitters to send
out to the relevant receiver important working information, like the
battery-status and the pushing on the PTT button. This telemetry
technology operates without affecting the audio signal’s quality or
bandwidth. The MSR 918 receiver (used on the Base
1) MULTIFUNCTION DISPLAY for:
• “A” & “B” antennas RF-signal
• “A” or “B” antenna selected
• TX deviation (%)
• “Line” AF output is active
• “Intercom” AF output is active
• TX % Battery lifetime
• Pilot sub-carrier is present
[ A & B bargraph ]
[ A ] or [ B ]
[ DEV bargraph ]
[ LINE ]
[ COM ]
[100%, 75%, 50%, 25%, 12%]
[ P.TONE ]
2) SWITCH: Channel [ 0 ÷ F ] with back-light.
3) SWITCH: Channel Group [ GR.1 / GR.2 ] (green Led).
4) SWITCH: Calibrating Tone Generator [ On / Off ] (red Led).
Unit of the Reportage System and if provided with the optional,
built-in, ITC 918 interface) will give to the reporter the possibility to
talk directly and “off air” to the technicians of its team. Every time
the reporter pushes the PTT push-button (of the RPU 300 Portable
Reportages Unit or of the MTH200 Handheld Transmitter) the
audio output line of the receiver is switched from the “main line” to
the auxiliary “intercom line”. Correlated with this intercom output
line activation, on the MSR 918 Receiver is also available a GPI
(General Purpose Interface) dry-contact output, suitable to be
connected with other external equipments. The GPI contact
becomes closed every time the reporter operates the PTT pushbutton. The MSR 918 is endowed also with a 1 kHz calibrating
tone-generator, that allows to test easily the audio line output and
the mixer input.
5) CONNECTOR: Monitor Output.
Standard ¼” (6.3 mm) stereo jack, mono wired.
6) ADJUSTMENT: Signal-squelch threshold.
7) SWITCH: Tone Squelch function [ On / Off ] (yellow Led).
8) SWITCH: PTT function [ On / Off ] (yellow Led). (optional).
See table #1.
9) MONITOR VOLUME
10) MULTIPOLE CONNECTOR (on rear-panel).
Some pins of the connector [10] are suitable for the
frequencies re-programming operations.
The MSR 918 Receiver Module complies the ETSI norms: EN 300 422, EN 300 445.
MSR918-1-eng.doc
WISYCOM S.r.l. • Via Spin, 156 • I-36060 Romano d’Ezzelino (VI) •
Tel. +39 0424 382605 • Fax +39 0424 382733 • www.wisycom.com •
Italy
e-mail: [email protected]
MSR 918 -
TRUE-DIVERSITY RECEIVER MODULE, for WIRELESS-MICROPHONE SYSTEMS
TECHNICAL SPECIFICATIONS:
• Switchable channels
:
16 + 16 preset in the 150 ÷ 250 MHz (VHF) or 470 ÷ 880 MHz (UHF) range (others on request).
• Channel groups
:
2, externally selectable.
• Switching-window
:
15 MHz (VHF); 32MHz (UHF).
• Frequencies
:
microprocessor controlled PLL frequency synthesizer circuit, with 25 KHz minimum step.
They can be easily user-reprogrammed by PC and optional “UPK32 Programming kit”.
• Frequency error
:
< ± 5 ppm, in the rated temperature range.
• Temperature range
:
-10 ÷ +55 °C.
• Modulation
:
FM, with 50 µs de-emphasis. • Nominal deviation = ±40 KHz @ 1 kHz (Max. deviation = ±75 kHz).
• “A” / “B” antenna inputs :
via multi-pole connector. • RF input impedance = 50 ohm (SWR < 1:2; typ. 1:1.4).
• Sensitivity (ENR)
:
⇒ < 2 µV ( +6 dBµV), for SND/N = 84 dB [1],
⇒ < 10 µV (+20 dBµV), for SND/N = 96 dB [1], in the whole switching-range.
• Amplitude response
:
< 0.2 dB (for RF input signal between +4 dBµV ÷ +120 dBµV).
• Co-channel rejection
:
> -3.5 dB @ 2 µV RF; > -1.5 dB @ 100 µV RF.
• Adjacent chan. selectivity :
> 90 dB (for channel spacing ≥ 400 kHz).
• Spurious rec. rejection :
> 93 dB.
• IF image rejection
:
> 98 dB.
• Intermodul. rejection
:
> 76 dB. • IIP3 (Input 3°-order Intercept Point) = +9 dBm.
• Spurious emissions
:
< 10pW (typ. = 0.1 pW).
• Squelch
:
⇒ field-strength: with externally adjustable threshold and adaptive-mode working (the receiver adapts itself to
the different situations of medium signal-strength levels and fading-speeds).
⇒ tone-squelch: with decoding of the matching sub-carrier, digitally modulated, generated by the relevant
transmitter. This function can be switched-off for the compatibility with other brand TXs.
• “Noise reduction” system :
compander circuit, can be internally pre-set to (or eventually switched off) on following modes:
⇒ ENR (Wisycom Extended-NR; ⇒ NR (standard NR), to be compatible with other systems.
• LINE / COM AF outputs :
transformer balanced, floating. • Output impedance = < 50 ohm.
• AF output level
:
+10 dBu (2450 mVrms), @ nominal deviation.
• AF bandwidth
:
20 Hz ÷ 20 kHz. • Frequency response = ±0.5 dB (±0.2 dB typ.) in the 30 Hz ÷ 20 kHz range.
• Distortion
:
< 0.3 % (0.15 % typ.) at nominal deviation (< 0.5 % at peak deviation).
• SND/N ratio (ENR)
> 105 dB (115 dB typ.) [1].
• Monitor output
:
¼” (6.3 mm) stereo jack connector, mono wired, on the front panel.
• Monitor output level
:
max 3 Vrms / 200 ohm, with volume control. • Monitor output impedance = 35 ohm.
• Diversity technology
:
true-diversity (Twin receiver circuits, with high-speed and low-noise electronic switching).
• Bar-graph meters
:
⇒ RF field strengths (both “A” and “B” antennas at the same time )
⇒ TX deviation (-20 ÷ +12 dB, relative to the nominal deviation).
⇒ TX battery lifetime, 5 steps: 100%, 75%, 50%, 25%, 12% (the last Led blinks ).
• Led indications
:
⇒ diversity switching (“A” / “B” antenna)
⇒ “main-line” AF output is active (LINE)
⇒ “intercom-line” AF output is active (COM) (Optional)
⇒ matching sub-carrier is present (P.TONE)
⇒ channel Group 1 selected (GR.1)
⇒ 1 KHz calibrating tone On
⇒ “tone-squelch” function On (see Table #1)
⇒ “intercom” function On (Optional) (see Table #1).
⇒ apparatus ON (channel-selector back-light).
• Optional outputs
:
⇒ “intercom” AF output line, for PTT function
⇒ GPI output, for PTT function (dry contact of solid-state relais)
⇒ “reporter acknowledgment” tone output (800 Hz, intermittent)
• Calibrat. tone generator :
1 kHz, +10 dBu, on both outputs main-line / intercom-line (optional).
• Powering
:
⇒ 10.5 ÷ 16 Vdc / 4 W (typ.: 350 mA @ 12 Vdc), negative ground
• Dimensions - Weight
:
123 x 49 x 327 mm - 1.7 Kg approx.
Note [1]: RMS value, unweighted, 22 Hz / 22 kHz, and referred to the peak deviation.
Table #1: outputs activation by PTT push-button, with different presettings of the functions
Transmitter
PTT push-button
NOT pushed
Pushed
NOT pushed
Pushed
NOT pushed
Pushed
NOT pushed
Pushed
Tone-squelch
switch [7]
OFF
OFF
ON
ON
ON
ON
OFF
OFF
PTT Function
switch [8]
OFF
OFF
OFF
OFF
ON
ON
ON
ON
LINE
AF line output
ON
ON
ON
OFF
ON
OFF
ON
ON
COM
AF line output
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
GPI
output
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OPTIONALS:
ITC918
-
Additional output connections: “AF intercom line”, “GPI dry contact” and “ACK signal”
MSR918-2-eng.doc
WISYCOM S.r.l. • Via Spin, 156 • I-36060 Romano d’Ezzelino (VI) •
Tel. +39 0424 382605 • Fax +39 0424 382733 • www.wisycom.com •
Italy
e-mail: [email protected]
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