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Compare the 6400(M) and 6600(M) radios

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FlexRadio Flex-6400

FLEX-6400

FLEX-6400M

FlexRadio Flex-6600

FLEX-6600

FlexRadio Flex-6600M

FLEX-6600M

MSRP $ 2299 $ 3449 $ 4599 $ 5699
Display & Controls Headless (requires external control via PC, Maestro, or SmartSDR) Integrated 8″ 1920×1200 IPS touchscreen with knobs and controls Headless (requires external control via PC, Maestro, or SmartSDR) Integrated 8″ 1920×1200 IPS touchscreen with knobs and controls
Independent Receivers 2 2 4 4
Spectral Capture Units (SCUs) 1 1 2 2
Panadapters Up to 2 Up to 2 Up to 4 Up to 4
Transverter Ports 1 1 2 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) 2 TX/RX (ANT1, ANT2), 2 RX only (RXA, RXB)
ATU (Antenna Tuner Unit) Optional internal ATU Optional internal ATU Integrated internal ATU Integrated internal ATU
Frequency Coverage RX: 0.03–54 MHz; TX: 160–6 m amateur bands RX: 0.03–54 MHz; TX: 160–6 m amateur bands RX: 0.03–54 MHz; TX: 160–6 m amateur bands RX: 0.03–54 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) 100W (SSB/CW/FM), 25W (AM)
Optional Extended Transmit Board
Full Duplex Operation
Diversity Reception x x
Band Pass Filters 6th Order 6th Order 6th Order 6th Order
GPSDO Support Optional Optional Optional Optional
SmartSDR Max Version Current Current Current Current
Manufacturing Status Discontinued Discontinued Discontinued Discontinued
Receiver RMDR 115 dB 115 dB 115 dB 115 dB
Transmitter IMD Better than -45 dB below 100W PEP @14.2 MHz Better than -45 dB below 100W PEP @14.2 MHz Better than -45 dB below 100W PEP @14.2 MHz Better than -45 dB below 100W PEP @14.2 MHz
MultiFLEX Support
CESSB Support
Remote Operation Yes (via SmartLink, SmartSDR, Maestro) Yes (via SmartLink, SmartSDR, Maestro) Yes (via SmartLink, SmartSDR, Maestro) Yes (via SmartLink, SmartSDR, Maestro)
Ideal For Operators using external control devices or software Operators preferring an all-in-one unit with integrated controls and display Advanced users needing multiple receivers and full duplex capabilities Advanced users who want both high-end performance and an all-in-one interface

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