Marti Electronics SR-20C, Руководство пользователя

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The Marti STL Transmitters with companion SR–20C and SR–20M Receivers form a high quality FM, syn-
thesized, point–to–point, line of sight, studio–to–transmitter link with two optional sub–channels. A dual link con-
sisting of two SR–20M systems for stereo provides two identical broadcast quality channels with better than 70 dB
stereo cross–talk and four optional sub–channels. Complex systems can be built from basic STL transmitters and
SR–20M/SR–20C receivers having multiple relay (repeaters), bi–directional (full duplex), and automatic switching
hot standby features.
The SR–20M receiver is a monophonic single channel unit that can be programmed on any frequency within a
50 MHz band. The SR–20C is a composite frequency agile receiver. The SR–20C can be programmed for any
frequency within a 50 MHz band. Each SR–20M and SR–20C STL receiver is offered in a wide range of band
models. Refer to the SPECIFICATIONS & ORDERING section for a listing of available frequency ranges.
The SR–20M/SR–20C receivers operate from: 1) an 85 to 264 volt, 47 to 63 Hz AC source or 2) a +10 to +14
volt DC source. SR–20M units are equipped with a multimeter and meter select switch for the monitoring of signal
level, subcarrier level, power supply voltage, and program output level parameters. SR–20C units are also equipped
with a multimeter and meter select switch for the monitoring of signal level, subcarrier level, power supply voltage,
monophonic program output level, and composite output level parameters. A front panel attenuation switch allows
the input level to be adjusted to minimize any IMD products. Additional front panel controls include: 1) a mono-
phonic program output level control, 2) a squelch control, and 3) a composite level control for SR–20C units. The
SR–20M/SR–20C front panel indicators include: 1) MAX signal, 2) ATT signal, 3) UNSQUELCHED, 4) POWER,
and 5) AFC LOCK.
STL Transmitter/SR–20M Applications:
STL for FM stereo broadcast (dual system)
STL for AM stereo broadcast (dual system)
STL for FM monaural or AM monaural broadcast
Inter–city relay for linking two or more broadcast facilities
Multi–relay system for radio network distribution
Communications link between satellite earth station and broadcast facilities
Data and Background Music links
Private microwave service
STL Transmitter/SR–20C Applications:
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Composite FM Stereo audio with subcarrier
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Monophonic audio with two subcarriers
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Digital stereo audio (requires external modems)
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Multi–channel audio or data (requires external MUX)
•
Digital data (requires external modems)