Flex Radio FLEX-6500

Quick Overview

FLEX-6500 for the Advanced Amateur
Excl. Tax: £3,241.62 Incl. Tax: £3,889.95



Flex 6500 HF & 6m transceiver (4m RX and transverter level output)

Customer Comment:

'Would just like to take the opportunity to thank the team at W&S following my purchase of a Flex-6300.  I would especially like to thank Justin who not only spent the time showing me the operation but also dealt with the purchase and managed to ship the next day despite the backlog from the Newark Hamfest. The Flex arrived safe and sound and is already up and running, great job guys. - Simon M0GBK'


FLEX-6500 Feature Highlights


  • Maximum Slice Receivers: Four (4)
  • Maximum Panadapter Bandwidth: 14 MHz
  • Antenna Connectors: SO-239x2; BNCx1; XVTR-BNCx1
  • Wideband Frequency Coverage: 30 kHz - 72 MHz
  • Transmit Frequency Coverage: 160-6m amateur bands, 100W nominal output
  • Transverter IF Frequency Coverage*: 100 kHz - 72 MHz
  • Digital Audio Exchange (DAX) Channels: Four (4)
  • DAX IQ Channels/Bandwidth per Channel (DAXIQ): Four (4) @ 24 kHz - 192 kHz
  • Preselectors: 160 - 2m (except 60m)
  • Microphone Connectors: Unbalanced 8-pin Foster, Balanced XLR/TRS
  • Antenna Tuner Unit (ATU): Integrated
  • Full Continuous Coverage Transmit: MARS/CAP Capable



SmartSDRª  With the Flex-6000 Signature Series radios, FlexRadio brings a wealth of new capabilities to the amateur including direct digital sampling reception, transmission and networking. At the core of all these new capabilities is SMartSDR. SmartSDR organizes all of the signal processing power in the Flex-6000 series into an advanced reusable framework.

SmartSDR notes: 27/9/2015 version 1.5 released which includes a new wideband Noise Blanker and D-star with use of an NWdigital DV3000U available from W&S

Plug & Play The Flex-6000 Signature Series was designed with plug-and-play installation as a requirement. There are no drivers or interface cards to install. Just plug the radio into an antenna, power supply and network, load the SmartSDR software on your existing PC and operate.

Not only is reception all digital; so is transmission. The FLEX-6500 transceiver incorporates an Analog Devices AD9122 16-bit digital to analog converter (DAC) operating at 491.52 MSps. Direct Digital Up Conversion (DUC) eliminates the traditional analog mixing and IF amplification, thus maximizing carrier and unwanted sideband suppression while minimizing spurious output and in-band intermodulation distortion.

The FLEX-6500 transceiver allows creation of up to 4 independent Slice Receivers providing reception from 0.03 MHz to 77 MHz. Each Slice Receiver can provide independent spectral display of up to 384 kHz.

The Flex-6000 Signature Series packs more built-in digital signal process power than ever before imagined in an amateur radio transceiver. The FLEX-6500 delivers 191 billion multiply-accumulate operations per second (GMACS) and 78 billion floating point operations per second (GFLOPS).

The FLEX-6500 transceiver utilizes FPGA hardware to directly generate the CW waveform digitally at the RF carrier frequency. This means that the RF carrier switches at hardaware speeds without first element truncation as is typical in many radios.

The FLEX-6500 incorporates a dedicated streaming audio DSP for low latency parametric equalization, RF audio compression, automatic level control, noise gating, and monitoring.

A SmartSDR deserves a high performance RF power amplifier system to match. The FLEX-6500 incorporates a push-pull pair of rugged RD100HHF MOSFET transistors operating at 13.8V DC. It also includes an automatic antenna tuner capable of tuning antennas over 10:1 range (3:1 on 160m and 6m).

The Flex-6000 Signature Series is the first amateur radio product family to offer an optional built-in GPS Disciplined Oscillator (GPSDO).

Additional Information

manufacturer FlexRadio
Bands Covered HF Bands, 6m
Maximum Output power 51W to 100W

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