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INTRODUCTION – STL–10A.
The MARTI STL–10A Studio Transmitter Link/Inter–city Relay is a line–of–sight FM communications system pro-
viding a high quality broadcast audio channel with two optional sub–channels. A dual link for stereo provides two
identical broadcast quality channels with better than 70 dB stereo cross–talk and four optional sub–channels. These
systems offer greater rejection of interference, superior noise performance, much lower channel cross–talk, and
greater redundancy than currently available composite STL systems.
APPLICATIONS OF THE STL–10A SYSTEM (FCC Approved Parts 74, 101):
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
Complex systems can be built from basic STL–10A transmitters and R–10 receivers having multiple relay (repeat-
ers), bi–directional (full duplex), and automatic switching hot standby features (refer to Figure 2).
Features of the STL–10A Transmitter include:
FCC approved under Parts 74 and 101.
User selectable audio processing provides 0, 25, 50, or 75 microsecond pre–emphasis
options.
Low–pass filters designed to eliminate overshoot on complex audio waveforms.
Calibrated RF watt meter for forward and reflected power.
Test meter on front panel indicates Subcarrier Level, Supply Voltage, PA Current, For
ward and Reflected Power. Additional test points are located inside transmitter.
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