Professional Bug Detector RF Environmental Sweep SURECOM SF-401 PLUS

Professional Bug Detector | Portable Frequency Counter

The SURECOM SF-401 PLUS is a compact portable frequency counter with a color TFT display, designed to measure RF signals and identify the transmission frequency of compatible radio devices. It also supports CTCSS/DCS tone decoding in the bands specified by the manufacturer.

Its compact size and low weight make it suitable for technicians, radio amateurs, installers and operators who need a portable instrument for checking transceivers and compatible RF sources.

Main features

• Frequency range: 27 MHz – 3000 MHz
• Decoder: CTCSS / DCS
• DMR mode: frequency-counter function for compatible DMR radios
• TCXO oscillator: 2–2.5 ppm accuracy
• Display: color TFT, 240 × 320 pixels
• Battery: integrated 3.7 V – 600 mAh Li-Ion
• Charging: Micro USB 5 V
• Antenna input: BNC, 50 Ohm impedance
• Response time: approx. 0.2–0.5 seconds
• CTCSS/CDCSS response: approx. 0.5–1 second
• Controls: 4 buttons
• Auto power-off: programmable from 1 to 9 minutes
• Consumption: approx. 10 mA
• Weight: 113 g
• Dimensions: 70 × 25 × 90 mm

CTCSS and DCS decoding

The SURECOM SF-401 PLUS includes CTCSS/DCS decoding. According to the manufacturer specifications, this function is available in the 136–174 MHz and 400–520 MHz bands.

RF frequency measurement

The device allows technical checks of RF signals compatible with its specifications. The declared range is 27 MHz to 3000 MHz.

Important note: the manufacturer states that performance in the 27–100 MHz range cannot be guaranteed. For reliable measurements, use the instrument according to the official documentation.

Applications

• Frequency checks on transceivers
• Testing VHF/UHF radio equipment
• Checking compatible DMR radios
• Checking RF sources within the instrument's range
• Technical work in radio-frequency applications
• Use by radio amateurs, technicians and installers

The SF-401 PLUS can also be used for technical environmental sweep checks on compatible RF sources. However, it should not be considered a universal analyzer or a device capable of guaranteeing detection of every bug, wireless microphone or transmitter.

Display and power supply

The device features a 240 × 320 color TFT display and an integrated 3.7 V 600 mAh Li-Ion battery. Charging is via Micro USB 5 V. A charging LED indicator is also provided.

Package contents

• SURECOM SF-401 PLUS
• UHF antenna
• USB charging cable
• 100–240 V USB AC adapter
• English user manual

Technical specifications

Brand: SURECOM. Model: SF-401 / SF-401 PLUS. Type: Portable frequency counter. Frequency range: 27–3000 MHz. CTCSS/DCS: Yes, in manufacturer-specified bands. TCXO accuracy: 2–2.5 ppm. Display: Color TFT 240 × 320. Battery: Li-Ion 3.7 V 600 mAh. Charging: Micro USB 5 V. Antenna input: BNC 50 Ohm. Weight: 113 g. Dimensions: 70 × 25 × 90 mm. Auto power-off: 1–9 minutes.

Usage note

Measurement quality depends on the distance from the RF source, environmental conditions and signal characteristics. Follow the manufacturer's instructions and keep the source at an appropriate distance from the antenna.

Official documentation

The technical specifications refer to the SURECOM SF-401 PLUS. Refer to the manufacturer's documentation for operating procedures, limitations and safety information.

Trademark notice

SURECOM and any other trademarks mentioned belong to their respective owners. The functions described do not imply the ability to detect every type of signal, device or transmitter.