Marconi IFR CPM-46 10MHz – 46GHz Frequency Counter / Power Meter

The Marconi IFR CPM-46 is a portable dual-function test instrument combining microwave frequency counter and true power meter capabilities in a single ruggedized unit. Engineered for field technicians and laboratory engineers installing and maintaining digital microwave radio systems and RF equipment, it delivers measurement speed and accuracy across 10 MHz to 46 GHz without sacrificing portability. The internal rechargeable battery provides three hours of continuous operation, while the transflective LCD with integral backlight ensures readability on towers, rooftops, and benchtop installations alike.

Technical Specifications

• Measurement range: 10 MHz to 46 GHz


• Resolution: User selectable from 1 Hz to 1 MHz


• Sensitivity: -20 dBm (10 MHz to 26.5 GHz); -15 dBm (26.5 to 40 GHz); -10 dBm (40 to 46 GHz)


• Measurement time: 1 Hz resolution


• Amplitude discrimination: 20 dB for signals >400 MHz


• FM tolerance: 20 MHz peak-to-peak (>1 kHz rate); AM tolerance: 20 kHz rate


• Operating modes: Relative frequency and frequency offset for drift and conversion analysis


• Pass/fail limits function with annunciator output Power Meter


• Frequency range: 30 kHz to 46 GHz (sensor dependent)


• Power range: -65 dBm to +44 dBm (sensor dependent)


• Input connector: 2.92 mm female


• Input impedance: 50 Ω nominal


• Maximum input: +10 dBm (typical, below 20 MHz)


• Damage level: +27 dBm


• Features: Pass/fail limits, dB relative, power offset, and duty cycle modes


• Integral 0 dBm reference at 50 MHz for sensor calibration


• Compatible sensors: Models 6910, 6920, 6930, 6930 opt.2, 6914, 6924, 6934


• Analog meter display for real-time power tuning Digital Voltmeter


• Range: 0 to +10 Vdc (protected to 40 Vdc)


• Resolution: 10 mV


• Accuracy: 2.5%

Key Features

• Internal rechargeable battery with AC adapter and vehicle supply charging


• Transflective LCD with backlight for multi-environment use


• Weight: 4.9 kg; compact dimensions for portable operation


• Ruggedized case design with carrying strap for field deployment

Typical Applications

• Installation and commissioning of digital microwave radio links


• In-service maintenance of RF transmission systems


• Frequency verification and power level monitoring on tower and rooftop installations


• AGC voltage measurement via integrated DVM


• Frequency drift and offset analysis in maintenance workflows

Compatibility & Integration The CPM-46 accepts standard RF power sensors and operates with 2.92 mm connectors. External AC and vehicle power sources support continuous laboratory operation beyond battery runtime.