FLEX-6700 Signature Series SDR Transceiver


Out of stock

The FLEX-6700 offers the ultimate performance direct sampling SDR technology and the best value for the serious HF/6m operator.

Effective June 1, 2023 FlexRadio will no longer manufacture the FLEX-6700 transceiver because of component shortages making deliveries unreliable.  

The FLEX-6700 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. The 6700 shares 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. Antenna Tuner is included. The FLEX-6700 reception is up through six-meter and two-meter bands while providing 2M operation with 5mW output power.

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 Power Genius 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.

FlexRadio’s industry-leading SmartSDR™ software offers compatibility across the entire FLEX-6000 Signature Series family to deliver continuous leveraged software enhancement. And you can use the latest SmartLink™ technology to access your radio virtually anywhere from any SmartSDR compatible client with only a login and password — even your iPhone.

FLEX-6700 Features

  • 100W PEP HF-6M Operation
  • All Modes/All Bands
  • Integrated Remote Operation With Maestro, PC/Laptop, Mac, iPad® Or iPhone®
  • 8 Independent Band / Mode Receivers
  • Full Duplex Cross-Band Operation
  • True Diversity Reception
  • Two Receive-Only Ports
  • One Transverter Port
  • Economical SO2R Solution – (OTSPR) Support In One Radio
  • Contest Band Filters: >30 dB Rejection
  • Direct Sampling SDR 245.76 Msps – 16 Bit
  • 116 dB 2kHz RMDR
  • >155 dB Dynamic Range
  • Built-In Antenna Tuner
  • 10 MHz Reference Input
  • Optional GPSDO Option for ultra-high frequency precision and accuracy
  • Continuous MARS/CAP Coverage with Extended Transmit Filter

Anywhere, Anytime, From Any Of These Devices:

With SmartLink and a FLEX-6700, you can operate your radio from almost anywhere! Just take an iPhone, iPad, Laptop, or Maestro with you and instantly connect to your radio with virtually no setup required.

Plug & Play Remote**

  • No complex setup required
  • Operate anywhere, any time
  • Use a Maestro, Mac, iPad, iPhone or Laptop
  • Across the country or across the world

Best in Class Performance

  • 116db RMDR
  • No listening fatigue
  • Ultra-Low Phase Noise
  • Full Break-in QSK CW
  • Diversity Reception
  • SO2R in a box
  • Brick Wall DSP Filters
  • Stunning transmit audio

Backed by an Amazing Suite of Software

  • SmartSDR for Windows
  • SmartSDR for Mac
  • SmartSDR for iOS
  • SmartSDR CAT
  • DAX

*A PC is required for use of 3rd party software such as loggers and digital modes programs.
**SmartLink Remote Requires SmartSDR V2.x License or Later. Requires an Internet connection.

FLEX-6700 Specifications


  • 8 Independent Band/Mode Receivers (Max)
  • 1 / 2 kHz Reciprocal Mixing Dynamic Range (RMDR): 110/115 dB
  • ADC Bits/Sampling Rate: 16/245.76 Msps
  • Frequency Coverage: 30 kHz-60 MHz, 135-165 MHz
  • 2m TX @ 5mw Output power
  • Amateur Band Preselectors: 3rd Order (except 60M)
  • Cableless Digital Audio (DAX/DAX IQ) Channels: 8/8
  • Receive Only Ports (Base/Including XVTR Ports): 2 / 3
  • Full Duplex RX/TX Operation
  • Simultaneous Receive on Two Antennas (e.g. 20m & 6m)
  • Single Radio SO2R Operation – No External Equipment Required
  • Diversity Reception


  • 160m-6m Transmitter Output: 1-100W (25W AM)
  • Harmonic Suppression (Typ): < -60 dBc
  • Antenna Ports: 2
  • Transverter Frequency Coverage/Power: 100 kHz – 54 MHz/0 to +10 dBm
  • Integrated Automatic Antenna Tuner Range: 3:1 SWR
  • Continuous MARS/CAP Coverage Standard
  • Microphone Connectors: Pseudo-balanced 8-pin Foster, Balanced XLR/TRS


    • Modes1 SSB, CW, AM, SAM, FM, RTTY, DIGITAL
    • Integrated Remote Operation
    • Maestro, PC, MAC, iPhone, & iPad Client Options
    • GPS Disciplined Oscillator: Optional 5 x 10-12 Over 24 Hours
    • External 10MHz Reference Input
    • Power Supply Requirements: 13.8 VCDC +/- 15% (14 VDC Nom)
    • Dimensions: 4”H (10.2 cm) x 13″W (33.0 cm) x 12.D (30.5 cm)

1. RTTY and other digital modes use 3rd party software over DAX channels.

FLEX-6700M Whats in the Box

  • FLEX-6700
  • FHM-3 Hand Mic
  • DC Power Cable
  • Ethernet Cable
  • Quick Start Guide

Want to know even more?


SKU: FLEX-6700 Categories: ,
Weight 7.2 kg
Dimensions 46 × 44 × 29.5 cm