FLEX-6600 A Real SDR for Every Operator

The FLEX-6600M™ offerS the ultimate performance direct sampling SDR technology and the best value for the serious HF/6m operator.

Both flex-6600 models share the same game changing band awareness, industry leading phase noise performance/ receiver dynamic range, and brick wall filters to give you the advantage in the most competitive DXing or contesting activities while maximizing your fun in casual operations. With a PC, laptop, or Mac client, you can utilize up to four 14 MHz spectrum/waterfall displays and independent band/ mode receivers to revolutionize your view of the bands, especially on digital modes.

Contest grade filters, ultra low spurious emissions, and the ability to operate full duplex cross band on two antennas let you transmit on one band while receiving on another – no external equipment required. Even switch to synchronous diversity reception when needed to help you pick out the weak ones in the midst of QRM.

By adding FlexRadio’s new PowerGenius XL LDMOS solid state amplifier a complete legal limit, all mode SO2R station is now practical with one radio, one amp and only three interconnect cables – half the cost and none of the complexity.

The FLEX-6600M places the most used controls right at your fingertips. Controls are labeled for intuitive operation and designed to minimize hand motion for the most common operations. Occasionally used controls are easily accessible on the large touch screen display bypassing the complexity of multi-function buttons and multi-level menus found on other transceivers.

Like modern smartphones and tablets, capacitive touch control is provided on the large LCD display for intuitive pan, zoom, tune, and menu operation. The FLEX-6600M controls are designed to provide maximum tempo in the most demanding applications including SO2R, Run, S&P, and Multi-op contesting.


FLEX-6600 Feature Highlights

  • Native Remote Operation: Using Maestro, PC, Laptop, iPad or iPhone
  • SDR Architecture: Direct Sampling
  • Independent High Performance Receivers: Four (4)
  • Reciprocal Mixing Dynamic Range (RMDR): 116dB
  • Spectral Capture Units (digitizers): Two (2)
  • Diversity Reception Capable using Separate Antennas: Yes
  • Single Operator Two Radios (SO2R) using one FLEX-6600: Yes
  • Contest Grade Preselectors: 7th Order on contest bands; 3rd order on remaining bands
  • Maximum Panadapter Bandwidth: 14 MHz
  • Radio Control Surfaces: Ergonomic tactile controls with touch screen interface
  • Integrated Display: 8-inch 1920×1200 IPS Display
  • External Display: 1920×1200 WUXGA via HDMI interface
  • Antenna Connectors: SO-239×2; XVTR-BNCx2, RX-IN-BNCx2
  • 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: Four (4)
  • DAX IQ Channels/Bandwidth per Channel (DAXIQ): Four (4)

Receiver Specifications

  • Receiver Architecture: Direct Digital Sampling
  • Spectral Capture Units (digitizers): Two (2)
  • Maximum Slice Receivers: Four (4)
  • ADC Resolution: 16-bits
  • ADC Sampling Rate: 245.76 Msps
  • Wideband Frequency Coverage: 30 kHz – 54 MHz
  • DAX IQ Channels / Bandwidth Per Channel: Four (4)
  • DAX Audio Channels: Four (4)
  • Amateur Band Preselector Coverage: 7th order on contest bands; 3rd order on remaining
  • 1/2 kHz Reciprocal Mixing Dynamic Range (RMDR): 110/116 dB

Spectrum/Waterfall Display Specifications

  • Maximum High Resolution Spectrum Displays: Four (4)
  • Panadapter Bandwidth: 1.2 kHz – 14 MHz
  • Spectrum Dynamic Range (max zoom): > 155 dB
  • Spectrum Resolution Bandwidth (min): 1.6 Hz
  • Integrated Touch Panel Display Size (diagonal)1: 8″ (20.3 cm)
  • Integrated Display Resolution1: 1920×1200
  • External Display Resolution/Connection1: 1920×1200/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
  • Audio Input: Balanced 1/4″ TRS for Microphone or Line level signals
  • Microphone Impedance: 600 Ohms Nominal (200-10kΩ)

Integrated 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-239×2, BNC XVTRx2, BNC RX-INx2
  • Antenna Impedance (w/o tuner): 50 Ohm Unbalanced


  • Power Supply Requirements: +13.8V DC nominal ±15%
  • Current Drain (Receive/Transmit Max): 2.0A / 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


  • GPS Disciplined Oscillator; 5×10-12 over 24 hours
  • MARS/CAP Coverage Filter Bank
  • ThumbDV module for D-Star mode
Specifications subject to change without notice.
 1FLEX-6600M model.
 2RTTY and other digital modes requires 3rd party software over DAX channels.