Pag. 17
high performances microphone system
Technical specification
• Two indipendent receivers tunable in all the specied fre-
quency range
• Frequency range:
» MRK 950-EX: 470/800 MHz (TV ch 21/62)
with internal active splitter
• Memorized channels: up to 2400 divided in 40 groups with
60 channels each
• Frequencies: microprocessor controlled PLL frequency syn-
thesizer circuit, with 25 KHz minimum step (others on re-
quest)
• Frequency error: < ± 2.5 ppm, within the rated temperature
range.
• Modulation: FM (50µs de-emphasis), other de-emphasis can
be pre-set on request and can be recalled from the menu.
• Nominal deviation: ±40 KHz @ 1 KHz, ±65 KHz peak with
ENR noise red. system, up to ± 110 KHz without noise re-
duction system
• “A” / “B” antenna inputs: with BNC type female connectors.
• “A” / “B” antenna input booster supply: 12Vdc 200mA max.
» RF input impedance: 50 ohm (SWR < 1:2)
• Sensitivity [with ENR]:
» < 0.9 µV ( -1 dBµV), for SND/N = 52 dBA, in the
whole switching-range [Rms value A weighted]
» < 10 µV (+20 dBµV), for SND/N = 115dB, in the
whole switching-range [Rms value A weighted]
• Amplitude response: < 0.2 dB (for RF input signal: +4 dBµV
÷ +120 dBµV)
• Co-channel rejection:
» > -3.5 dB @ 2 µVRF
» > -1.5 dB @ 100 µV RF
• Adjacent chan. selectivity: > 90dB @ ±300 KHz
• Spurious rec. rejection: > 90 dB
• IF image rejection: > 110 dB
• IIP3 (Input 3° order Intercept Point):
> 20 dBm
• Spurious emissions: < 1pW (typ. = 0.1 pW)
• Signal strength squelch: menu adjustable threshold from
-6dBµV (0.5µV) to 60dBµV (1000 µV) plus OFF position and
“adaptive type” working: the receiver adapts itself automat-
ically to different conditions of both medium strength and
speed variation of the received signal
• Tone-squelch: it works by decoding the special key, sub-car-
rier (digitally modulated) present on the carrier of the ac-
tual Wisycom transmitters. The tone squelch function can be
inhibited for compatibility with other types of transmitters
• Noise Reduction system : compander circuit, can be pre-set
(or switched off) to the following modes:
» ENR (Wisycom Extended-NR) as default
» CUSTOM (to be compatible with other brands trans-
mitters)
• AF line output level: +12 dBu (3.1 Vrms) @ nominal devia-
tion (could be individually attenuated by 30dB by means of a
switch on the back panel under the XLR connectors)
• AF line output peak level: +20 dBu (7.75Vrms)
• AF line output connector: XLR, pin 1 could be grounded or
oating by means of a switch on the back panel under the
XLR connectors. Could withstand up to +52 Vdc of phantom
supply
• AF output impedance: <= 200 ohms
• AF bandwidth: 40 Hz ÷ 20 KHz
• Frequency response: < ±0.5 dB (±0.2 dB typ.) in the 50 Hz
÷ 19 KHz range
• Distortion: < 0.3 % (0.1 % typ.) @ peak deviation, ENR
noise reduction system enabled
• SND/N ratio [1] > 110 dB (115 dB typ.) [2]
• Monitor output: 1/4” (6.3 mm) stereo jack connector
• Monitor output level: max 6 Vrms / 150 ohm
• Monitor out impedance: 50 ohm
• Diversity technique: true-diversity (Twin receiver circuits)
• Bar-graph meters:
» RF eld strengths (both “A” and “B” inputs)
» AF deviation (5% ÷ 150%), with peak-hold mode
• Displays: nr. 2, one each receiver, 64 x 160 pixel LCD dot
Matrix (blue backlighted)
• Calibrating AF tone: 1 KHz, +12 dBu (other on request)
• Powering: 90 ÷ 264 Vac, external 2A T fuse
» input frequency: 47 ÷ 440 Hz
» rated input current 1.5A
» inrush current (132/264 VAC) 24/48A (cold start)
» Internal security fuse: T2.2AL, 250V not replaceable
» Unfused output mains connection, 5A max
• Temperature range: -10 ÷ + 55 °C
• Dimensions: 19”/1U, depth 370mm
MRK 950 Modular Wireless-Microphone Receiver System
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