1
SR-30 / SR-40A RPU Receivers
1 Introduction
The Marti SRPT-30 and SRPT-40A Transmitters with companion SR-30/SR-40A Receivers, form a high quality
FM, synthesized, point-to-point, line of sight, radio communications link for remote broadcast applications.
The SR-30 receiver is a dual channel unit that can be programmed on any 2 frequencies within a 50 MHz
band. The SR-40A receiver is frequency agile within a 50 MHz band. Complex systems can be built from
basic SRPT-30/SRPT-40A transmitters and SR-30/SR-40A receivers having multiple relay (repeaters), bi-
directional (full duplex), and automatic switching standby features. Each SR-30 and SR-40A RPU receiver is
offered in a wide range of band models. Refer to the SPECIFCATIONS & ORDERING section for a listing of
available frequency ranges.
The SR-30/SR-40A receivers operate from: 1) an 85 to 264 VAC, 47 to 63 Hz or 2) a +10 to +14 VDC source.
A meter and selector switch is provided for monitoring, signal level, decode level, power supply voltage, and
the program output level. A front panel attenuation switch allows the input level to be adjusted to minimize
any IMD products. Additional front panel controls include: 1) a program output level control, 2) a squelch
control, 3) an F1/F2 switch on SR-30 models, and 4) an execute switch on SR-40A models. The SR-30/SR-40A
front panel indicators include: 1) MAX signal, 2) ATT signal, 3) UNSQUELCHED, 4) POWER, 5) AFC LOCK, and
6) F1/F2 on SR-30 models.
SR-30/SR-40A Features:
• Mechanical design – Allows each unit to be portable or rack mounted
• Wideband operation - 50 MHz
• SR-30 Models – Two channel operation within a 50 MHz band
• SR-40A Models – Frequency agile within a 50 MHz band
• Switching power supply operates on any AC voltage from 85V to264V, 47 to 63 Hz
• External +10 to +14 VDC operation
• Frequency synthesized dual stage RF converter module with Automatic Frequency
Control (AFC)
• Front panel signal attenuation control – used to minimize IMD products
• Front panel squelch control
• Front panel headphone control and receptacle
• A microcontroller programmed to perform the following functions:
• Front-panel switch and indicator control
• AFC lock control
• Metering control
• Auto recovery from loss of ac/dc power
• Subaudible tone decoder available for signaling, automation control, or automatic
repeater
• Squelch relay with contacts available for external switching
1.1 SPECIFICATIONS & ORDERING
Frequency Bands: See ORDERING INFORMATION below.
Type of technology to
produce operating
frequency:
Phase-locked loop; synthesized
Frequency Agility and
Accuracy
Frequency programmable in 100 Hz increments with
an accuracy (1) ± ?%
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