AstroRadio SL


FLEX 6400

Transceptor FLEX 6400

Both the FLEX-6400™ and FLEX-6400M™ offer the latest direct sampling SDR technology at an economical price for the general HF/6m operator yet they offer excellent performance for chasing DX and contesting. The FLEX-6400 model is designed for the Ham who wants to operate the radio exclusively as a server from PC, laptop, Maestro, Mac, or iOS clients – whether local or remote. Both models share the same game changing band awareness, industry leading phase noise performance, brick wall filters, and legendary audio performance to deliver you the most fun across a wide variety of operating styles.

With a PC, laptop, or Mac client you can utilize up to two 7 MHz spectrum/waterfall displays and independent receivers to revolutionize your view of the bands. Its two receivers can be placed simultaneously on any band and mode with instant QSY between VFOs. Digital mode operation is a dream with no sound cards, cables or boxes needed.


  • Native Remote Operation: Using Maestro, PC, Laptop, iPad or iPhone
  • SDR Architecture: Direct Sampling
  • Reciprocal Mixing Dynamic Range (RMDR): 116dB
  • Independent High Performance Receivers: Two (2)
  • Maximum Panadapter Bandwidth: 7 MHz
  • Antenna Connectors: SO-239x2, BNC XVTRx1, BNC RX-INx1
  • 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
  • Full Duplex Operation: Yes
  • Digital Audio Exchange (DAX) Channels: Two (2)
  • DAX IQ Channels/Bandwidth per Channel (DAXIQ): Two (2)


Receiver Specifications

Receiver Architecture: Direct Digital Sampling
Spectral Capture Units (digitizers): One (1)
Maximum Slice Receivers: Two (2)
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)
DAX Audio Channels: Two (2)
Amateur Band Preselector Coverage: 3rd order
1/2 kHz Reciprocal Mixing Dynamic Range (RMDR): 110/116 dB

Spectrum/Waterfall Display Specifications

Maximum High Resolution Spectrum Displays: Two (2)
Panadapter Bandwidth: 5 kHz - 7 MHz
Spectrum Dynamic Range (max zoom): > 145 dB
Spectrum Resolution Bandwidth (min): 5.85 Hz
Integrated Touch Panel Display Size (diagonal)1: 8" (20.3 cm)
Integrated Display Resolution1: 1920x1200
External Display Resolution/Connection1: 1920x1200/HDMI

Transmitter Specifications

Transmitter Architecture: Direct Digital Up-conversion
Modulation System: Digital Low Power at Carrier Frequency
RF Output Power: 1-100W nominal SSB, CW, FM, RTTY, Digital; 1-25W nominal AM
Amateur Band Coverage at Rated Power Output: 160m – 6m
Transverter IF Output Power: +0 dBm Typical; +10 dBm max
Transverter IF Frequency Coverage: 100 kHz - 54 MHz
DAX Transmit Channel: Yes
Harmonic Suppression: < -60 dBc typical
Transmit Bandwidth: Default 100-2900 Hz (Variable 50-10000 Hz)
Microphone Connector: Pseudo Balanced 1/8" TRS
Microphone Impedance: 600 Ohms Nominal (200-10kΩ)

Optional 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)
Internal 10 MHz Reference Clock Stability: 0.5ppm TCXO (0-50C)
Emission Modes: USB, LSB, CW, RTTY2, AM, Synchronous AM, FM, NFM, DFM, FreeDV2
Frequency Resolution: 1 Hz min.
Antenna Connectors: SO-239x2, BNC XVTRx1, BNC RX-INx1
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: 6.74" (17.1 cm) with feet
Width: 14.0" (35. cm)
Depth: 13.25" (33.7 cm)
Operating Temperature: 0 to +50 degrees C; +32 to +122 degrees F


Antenna Tuning Unit (ATU); 3:1 SWR
GPS Disciplined Oscillator; 5x10-12 over 24 hours
MARS/CAP Coverage Filter Bank
ThumbDV module for D-Star mode

Specifications subject to change without notice.
1FLEX-6400M model.
2RTTY and other digital modes requires 3rd party software over DAX channels.



Price: € 2 541.00      VAT included

Only in Spain Peninsula

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