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FlexRadio Flex-6400

FLEX-6300

FLEX-6500

FLEX-6700

Display & Controls Headless (requires external control via PC, Maestro, or SmartSDR) Headless (requires external control via PC, Maestro, or SmartSDR) Headless (requires external control via PC, Maestro, or SmartSDR)
Independent Receivers 2 4 8
Spectral Capture Units (SCUs) 1 1 2
Panadapters Up to 2 Up to 4 Up to 8
Transverter Ports 1 1 2
Antenna Ports 2 TX/RX (ANT1, ANT2), 1 RX only (RXA) 2 TX/RX (ANT1, ANT2), 1 RX only (RXA) 2 TX/RX (ANT1, ANT2), 2 RX only (RXA, RXB)
ATU (Antenna Tuner Unit) Optional internal ATU Standard internal ATU Standard internal ATU
Frequency Coverage RX: 0.03–54 MHz; TX: 160–6 m amateur bands RX: 0.03–72 MHz; TX: 160–6 m amateur bands RX: 0.03–77 MHz & 135–165 MHz; TX: 160–6 m amateur bands
Transmit Power 100W (SSB/CW/FM), 25W (AM) 100W (SSB/CW/FM), 25W (AM) 100W (SSB/CW/FM), 25W (AM)
Optional Extended Transmit Board x TURF file TURF file
Full Duplex Operation
Diversity Reception x x
GPSDO Support x Optional Optional
SmartSDR Max Version Current Current Current
Manufacturing Status Discontinued Discontinued Discontinued
Receiver RMDR 110 dB 115 dB 124 dB
Transmitter IMD Better than -41 dB below 100W PEP @14.2 MHz Better than -41 dB below 100W PEP @14.2 MHz Better than -41 dB below 100W PEP @14.2 MHz
MultiFLEX Support
CESSB Support
Band Pass Filters x 3rd Order 3rd Order
Remote Operation Yes (via SmartLink, SmartSDR, Maestro) Yes (via SmartLink, SmartSDR, Maestro) Yes (via SmartLink, SmartSDR, Maestro)
Ideal For Entry-level SDR users seeking a simple, capable platform Advanced hams needing more panadapter and receiver flexibility Elite operators requiring top-tier RX diversity and multi-band capability

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