FLEX-6700R 2017-11-30T17:35:35+00:00

FLEX-6700R HF/VHF Wideband Receiver

The FLEX-6700R™ Signature Series Direct Sampling receiver represents the state of the art in software defined radios. With the ability to simultaneously receive up to eight (8) different band segments on two (2) separate antennas in the most demanding RF environments, the FLEX-6700R vastly improves operator situational awareness over traditional radio architectures. Continuous frequency coverage from 20kHz to 72MHz plus 135 to 165MHz is available with up to 14MHz of instantaneous spectrum display per panadapter screen.

Interface to the radio is accomplished using Ethernet connectivity allowing for remote LAN operation today and the capability of future WAN operation from anywhere. SmartSDR for Windows, a highly integrated graphical user interface, provides real-time spectrum and waterfall displays, precise frequency management and antenna controls, and interface to a host of third party demodulation and signal analysis applications.

FLEX-6700R Primary Use Case Applications

  • Wideband HF/VHF Receiver applications
  • Remote HF Receiver sites
  • Auxiliary Monitor Receiver

FLEX-6700R Feature Highlights

  • Maximum Slice Receivers: Eight (8)
  • Digitizers: Two independent wide-band digitizers / Spectral Capture Units (SCUs)
  • Maximum Panadapter Bandwidth: 14 MHz
  • Antenna Connectors: BNCx2
  • Wideband Frequency Coverage: 30 kHz - 72 MHz; 135 - 165MHz
  • High Definition Displays: Panadapter and "play back in time" Waterfall per panadapter
  • Digital Audio Exchange (DAX) Channels: Eight (8)
  • DAX IQ Channels/Bandwidth per Channel (DAXIQ): Four (4) @ 24 kHz - 192 kHz
  • Preselectors: 160 - 2m (except 60m)
  • RF Preamps: Programmable multi-stage pre-amp for each SCU
  • Data Steaming: Utilizes VITA-49 Standard for seamless I/Q data streaming

Receiver Specifications

  • Receiver Architecture: Direct Digital Sampling
  • Spectral Capture Units: Two (2)
  • Maximum Slice Receivers: Eight (8)
  • Maximum High Resolution Spectrum Displays: Eight (8)
  • Maximum Panadapter Width: 14 MHz
  • ADC Resolution: 16-bits
  • ADC Sampling Rate: 245.76 Msps
  • Wideband Frequency Coverage: 30 kHz - 72 MHz; 135 - 165 MHz
  • DAX IQ Channels / Bandwidth Per Channel: Four (4) @ 24 kHz - 192 kHz
  • DAX Audio Channels: Eight (8)
  • Amateur Band Preselector Coverage: 160m - 6m (except 60m)
  • Preamplifiers / Attenuators: -10 to +30 dB
  • Spurious and Image Rejection Ratio: 100 dB or better
  • External Powered Speaker Output Impedance Level: 600 Ohm Stereo Unbalanced

General Specifications

  • USB 2.0 Ports (peripheral control): Two (2)
  • Master Clock Frequency: 983.04 MHz
  • Master Clock Phase Noise: -152 dBc
  • 10 MHz Reference Clock Stability: 0.02ppm OCXO
  • GPSDO Frequency Stability (GPS locked): 5 x 10 (-12) over 24 hours
  • Emission Modes: USB, LSB, CW, RTTY**, AM, Synchronous AM, FM, NFM, DFM
  • Frequency Resolution: 1 Hz min.
  • Antenna Connectors: BNCx2


  • Power Supply Requirements: 100 - 240 VAC; 47 - 63Hz; (5W standby / 50W operational)


  • Height: 4" (10.2 cm) with feet; 3.5" (8.9 cm) without feet attached
  • Width: 13" (33 cm)
  • Depth: 12" (30.5 cm) or 13" (33.04 cm) with front handles
  • Weight: Approximately 10 lbs. / 4.5 kgs
  • Operating Temperature: 0 to +50 degrees C; +32 to +122 degrees F


  • 2U, 19inch (48.26cm) Rack Mounting Kit
  • Front Handle Kit (adds 1 inch/2.5cm to total depth
  • GPSDO (TCXO) with Rear Panel 10MHz Reference Output

Specifications subject to change without notice.

The following product datasheets are available for download.

FLEX-6700R Datasheet (0.9 MiB)

FLEX-6000 Family Datasheet2.0 MiB20582
FLEX-6000 Family Quick Start Guide2.1 MiB9387
FLEX-6000 FDX Power Calculation Worksheet0.5 MiB738
FLEX-6000 GPSDO Installation Guide2.1 MiB2472
FLEX-6000 Handle Kit Installation Guide1.3 MiB831
FLEX-6000 Hardware Reference Manual2.3 MiB6095
FLEX-6000 Rack Mount Kit Installation Guide0.8 MiB937

SmartSDR V2.2.8 Release Notes0.2 MiB1093
SmartSDR V2 ChangeLog25 KiB422
SmartSDR V2.2.8 Installer49.4 MiB3595

SmartSDR V1.11.12 Release Notes0.6 MiB651
SmartSDR V1 ChangeLog0.1 MiB192
SmartSDR V1.11.12 Installer51.5 MiB3750

A comprehensive listing of files can be found on the Downloads page.

FLEX-6700R Signature Series 2-Year Limited Hardware Warranty

This Limited Warranty is effective as of the date of first purchase by the consumer. Original equipment hardware warranties and manufacturer support for FlexRadio products applies only to the original purchaser and are not transferable unless a Warranty Transfer agreement is purchased from FlexRadio Systems. Before sending in your product for service, it is recommended that you query the FlexRadio Community to make sure your issue is not easily resolved. If you still have an issue, submit a request for support via the FlexRadio HelpDesk. Once you are assigned a incident or ticket number, one of our Technical Support Engineers will determine if the issue your product is experiencing requires service or repair and will either issue you an RMA (Return Material Authorization) number for service in Austin, TX or refer you to another authorized Service Center. Any product returned for service that is out of warranty or has had its warranty voided is subject to a one (1) hour diagnostic bench charge. This charge will be applied to any work performed.

What is Covered:

During the first thirty (30) days after the date of shipment, FlexRadio Systems will fully repair or replace defective product at their discretion. For the remaining two (2) years after the date of shipment, FlexRadio Systems will replace defective parts free of charge (post-paid) for transceiver components only. Any replacement hardware parts will be warranted for the remainder of the original warranty period or ninety (90) calendar days from the date of installation or repair, whichever is longer. FlexRadio Systems will also correct any failure caused by defective parts and materials. You must send the unit at your expense to FlexRadio Systems. FlexRadio Systems will pay return shipping to the country of purchase.

What is Not Covered:

This Limited Warranty as it pertains to the transceiver or radio components does not cover repair or damage caused by (1) misuse, negligence or user modifications; (2) any performance or operational malfunctions involving non-FlexRadio accessory equipment; (3) connection to improper or unstable voltage supply; (4) improper execution of hardware calibration or test routines; (5) the incorrect installation of any and all cables connected to the radio by the user; (6) the use of third-party software applications or hardware that directly or indirectly controls radio functions and/or operating state by utilizing a communication or control protocol, such as, but not limited to CAT or I2C commands or (7) random acts of nature such as flood, fire, water, weather related storm, lightning or electrostatic discharge damage.

Limitation of Incidental or Consequential Damages:

This warranty does not extend to non-FlexRadio equipment or components used in conjunction with our products. Any such repair or replacement is the responsibility of the customer. FlexRadio Systems shall not be liable or responsible for reimbursement for any special, indirect, incidental or consequential damages, including but not limited to any loss of business or profits, loss of property, loss of revenue, loss of use, loss of data, inconvenience or cost of unauthorized service.

For more information contact FlexRadio Systems Commercial Sales.