WisyCom MSR916, User Manual, Page: 7 / 12

6
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 or UPK100 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
:

±20 kHz @ 1 kHz. (Max. deviation = ±75 KHz).

±40 KHz @ 1 kHz (Peak deviation = ±60 KHz).

“A” / “B” antenna inputs
:
with N-F connectors.

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.

Squelch-controlled DC output-
power
:
is controlled by the squelch circuit. When the AF output line is active, the DC input-
power is connected to pin 2 of the XLR4-M - DC input-connector on rear-panel (max
current = 2A).

“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.

AF line output
:
transformer balanced, floating.

Output impedance = < 50 ohm.

AF output level
:
+10 dBu (2450 mVrms), @ ±40 KHz 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.) @ ±40 KHz deviation (< 0.5 % @ 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).

Remote diversity function
:
the MSR916 receiver, along with audio signal on the line-output, is signalling also the
RSSI level. A Centralized Automatic Selector (i.e.: RDA41, suitable for 4 remote
receivers) can use this voting information to use in any time select the best audio
signal.