Nevada Radio

Flex Radio Flex-6400

SDR HF & 6m Transceiver 100W





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Picture shows (left) Matt from Flex demonstrating the new radio to our Boss Mike G3SED at the Friedrichshafen ham show. Nevada will be one of the first with these models!

The new Flex 6400 Transceiver is the very latest in SDR development from Flex Radio and is a direct replacement for the 6300. So what are the stand-out differences between the 6300 and 6400

Improved Receiver Performance

Despite the fact the 6300 has an excellent receiver, Flex Radio have pushed the boundaries once again to nudge performance up a little to ensure they stay right at the top of the pile in terms of receiver performance (Sherwood Engineering independent receiver performance comparison).

Now with Preselectors!

The 6300 did not have any bandpass filtering based on the quality of the reciever being at such a level that it would not need to have them. However, if the 2 slices were placed at different points within the 7MHz SCU (spectural Capture Unit) bandwidth, performance could be compromised slightly. Now the 6400 is fitted as standard with these BPF, performance is always assured no matter which bands are in use!

Optional GPSDO

It was not possible to fit the GPSDO (GPS Deciplined Oscillator) which provides super-stable and accurate frequency calibration. Now the Flex Radio GPSDO can be fitted as an optional extra.

Modular Design

This 6400 has been designed to use slot in boards which allows for easier repair and service over that of the Flex 6300

SmartSDR Version 2

While SmartSDR can be used on any Flex 6000 series, it is provided free of charge on the 6400. With ground-breaking single-click remote operation, Flex Radio have taken remote station operation to the next level by providing more users than ever with an easy route in.

Other FLEX-6400 Features include
  • Maximum Panadapter Bandwidth: 7 MHz
  • Antenna Connectors: SO-239×2; XVTR-BNCx1
  • Digital Audio Exchange (DAX)
  • DAX IQ Channels/Bandwidth per Channel (DAXIQ): 2 @ 24 kHz - 96 kHz
  • Microphone Connector: Unbalanced 8-pin Foster
  • Antenna Tuner Unit (ATU): Optional
  • Wideband Frequency Coverage: 30 kHz - 54 MHz
  • Transmit Frequency Coverage: 160-6m amateur bands, 100W nominal output
  • Transverter IF Frequency Coverage: 100 kHz - 54 MHz

Receiver Specifications
  • Receiver Architecture: Direct Digital Sampling
  • Spectral Capture Units: One (1)
  • Maximum Slice Receivers: Two (2)
  • Maximum High Resolution Spectrum Displays: Two (2)
  • Maximum Panadapter Width: 7 MHz
  • ADC Resolution: 16-bits
  • ADC Sampling Rate: 122.88 Msps
  • Wideband Frequency Coverage: 30 kHz - 54 MHz
  • DAX IQ Channels / Bandwidth Per Channel: Two (2) @ 24 kHz - 96 kHz
  • DAX Audio Channels: Two (2)
  • Amateur Band Preselector Coverage: NA
  • Preamplifiers / Attenuators: 0 to +20 dB
  • Spurious and Image Rejection Ratio: 80 dB or better
  • External Powered Speaker Output Impedance Level: 600 Ohm Stereo Unbalanced

Transmitter Specifications
  • Transmitter Architecture: Direct Digital Up-conversion
  • TX DAC Resolution: 16-bits
  • TX DAC Sampling Rate: 122.88 Msps
  • RF Output Power: 1-100W nominal SSB, CW, FM, RTTY, Digital; 1-25W nominal AM
  • Amateur Band Coverage at Rated Power Output: 160m - 6m
  • Low Pass PA Filter Bands: 160m - 6m ham band only
  • Transverter IF Output Power: +0 dBm Typical; +15 dBm max
  • Transverter IF Frequency Coverage: 100 kHz - 54 MHz
  • Modulation System: Digital Low Power at Carrier Frequency
  • Maximum FM Deviation: ±5 kHz
  • DAX Transmit Channel: Yes
  • Carrier / Unwanted Sideband Suppression: <-80 dBc typ / <-80 dBc typ
  • Harmonic Radiation 1.8 - 50 MHz Amateur Bands: <-50 dBc; -70 dBc 6m
  • Transmit Bandwidth: Default 100-2900 Hz (Variable 50-10000 Hz)
  • Microphone Connector: Unbalanced 8-pin Foster
  • Microphone Impedance: 600 Ohms Nominal (200-10k)

Antenna Tuner Specifications
  • Matching Range 80m - 10m: Optional, 8.3 Ohms - 300 Ohms
  • Matching Range 160 and 6m: Optional, 16.7 Ohms - 150 Ohms

General Specifications
  • USB 2.0 Ports (peripheral control): Two (2)
  • Master Clock Frequency: 122.88 MHz
  • Master Clock Phase Noise: -140 dBc@10kHz
  • 10 MHz Reference Clock Stability: 0.5ppm TCXO
  • GPSDO Frequency Stability (GPS locked): NA
  • Emission Modes: USB, LSB, CW, RTTY**, AM, Synchronous AM, FM, NFM, DFM
  • Frequency Resolution: 1 Hz min.
  • Antenna Connectors: SO-239×2, XVTRx1
  • Antenna Impedance (w/o tuner): 50 Ohm Unbalanced

  • Power Supply Requirements: +13.8V DC nominal ±15%
  • Current Drain (Receive/Transmit Max): 1.7A / 23A @ 13.8V

  • Height: 3.875" (7.1 cm) with feet
  • Width: 13" (33 cm)
  • Depth: 11.752"  (29.8 cm)
  • Weight: Approximately 10 lbs. / 4.5 kgs
  • Operating Temperature: 0 to +50 degrees C; +32 to +122 degrees F

  • Antenna Tuning Unit (ATU); greater than 3:1 on 80-10m, up 2.5:1 on 160 and 6m
  • Front Handle Kit (adds 1 inch/2.5 cm to total depth

Specifications subject to change without notice.
** Requires 3rd party software.

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