Rohde & Schwarz CTH200A Radio Tester

The Rohde & Schwarz CTH200A is a portable radio test set engineered for field verification and maintenance of analog FM radio systems in demanding environments. This all-weatherproof instrument combines transmitter and receiver measurement capabilities with optional over-the-air testing, cable fault location, and voice reporting functionality. Its compact design and intuitive operation enable rapid commissioning and troubleshooting without specialized expertise.

– Technical Specifications

Transmitter Measurements
• Forward and reflected power measurement
• VSWR determination from forward and reflected power
• Frequency measurement with 100 Hz counter resolution
• Simultaneous measurement of forward power, reflected power, and frequency with continuous updates
• Transmit power degradation and transmitter failure detection

Receiver Measurements
• Squelch testing and demodulation analysis
• Test signal generation into device under test
• Sub-audio squelch tone and audio tone generation for receiver verification

Over-the-Air Measurement (R&S®CTH200A)
• Transceiver functional testing without direct cable connection
• Built-in antenna for over-the-air signal detection and evaluation
• Received power indication via bargraph display
• Transmit frequency accuracy verification
• Power output verification of transceiver under test
• Dynamic range: 60 dB
• Operating frequency range: 30 MHz to 512 MHz

Cable Fault Finder (R&S®CTH200A)
• Antenna-to-transceiver connection fault detection
• Distance-to-fault measurement with configurable velocity factor
• Nominal cable impedance: settable (e.g., 50 Ω)
• Measurement ranges: < 120 m, < 240 m, < 480 m
• Detection of open circuits, short circuits, and minimal reflections

Voice Reporting (R&S®CTH200A)
• Measured values transmitted via RF to transceiver output speaker
• Enables operation in environments where direct display viewing is impractical

– Key Features

• Frequency range for power and frequency measurement: 30 MHz to 512 MHz
• Power level range: 0.1 W to 50 W
• Absolute maximum input power: 100 W
• Power measurement uncertainty: 0.8 dB at both connectors (< 200 MHz)
• All-weatherproof, ergonomic construction for outdoor deployment

– Typical Applications

• Field maintenance and verification of FM radio systems
• Transmitter power and impedance verification
• Receiver squelch and demodulation testing
• Antenna and transmission line fault location
• Over-the-air transceiver functional testing

– Compatibility & Integration

Designed for direct connection to transmitters and receivers operating in the VHF/UHF band. Cable fault finder accommodates multiple cable types through velocity factor adjustment.