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FDM-DUO is a SDR tranceiver that offers the possibility to operate STand-alone like traditional radio or attached to a Personal Computer discovering the possibilites offered by the SDR technologies.

Stand-alone Specifications updated 6 June 2014


Freqency range: 10KHz - 54MHz

Direct sampling receiver operating @ 122.88MHz ADC: LTC2165 16bit

DDC (Digital Down Converter) FPGA Xilinx Spartan.6 family down to 192Ksps

DDC, Filter & Demodulator ARM STM32F429 floating point microcontroller

Demodulation CW, LSB, USB, AM

LSB,USB Filters selectable 1600-3100Hz Bandwitdh with 100Hz step plus 4000-5000-6000 Hz Bandwitch

AM Filter selectable from 2500 to 6000Hz with 500Hz step

CW Filters 2600Hz-1500-1000-500-300-100Hz Bw plus 4 Cw peak filters applied after 100Hz Bw to obtain an overall filter of 20Hz Bw

Noise Reduction  10 levels

Noise Blanker 10 leves

VFO A, VFO B, 199 MEMORIES with Frequency/ Alphanumeric label visualization, programmable by FDM-SW2 memory manager

Programmable BAND selections: selectable up to  20 quick recallable memories from 180 to 199



DDS AD9957  with 368.64 MHz clock

Microphone input ADC 48KHz @16bit selectable gain -12dB to +12dB

Key and Paddle input for CW operation (Iambic A e Iambic B selectable)

5W min power output from 160m to 6m, 8 W typ output @14MHz

PTT Output connector to drive external amplifiers



All programmable components (ARM RX, ARM TX, Flash for FPGA, User Interface microcontroller and USB controller) are firmware upgradable

CAT input USB control interface with FTDI controller

Antenna connectors: RTX SO-239, RX SO-239

Monitor output: 0dBm SMA to be used as test equipment allow the use  as a Digital RF Generator

LCD Backlight RGB programmable, depending on function can change the colour (RX, TX , PC remote control)

10MHz Reference input connector: SMA

Power supply: 2.1mm DC Plug 13.8VDC RX consumption 500mA typ (13.8V) TX: 2.2amp

Size: Witdh 180mm (7.00") x Depth 155mm (6.10") including Knob and connectos or 130mm (5.10") only enclosure  x Height 70mm (2.75")

Weight: 1.2Kg (2.4 lb), shipment package 2.2Kg (4.85 lb)


PC mode operation with FDM-SW2 software specifications updated 6 June 2014


Up to 9 simultaneous receivers combination ( 1 on center frequency stand alone, 4 FDM-SW2 in fist 192kHz channel and 4 in the second 192kHz channel

Each receiver on FDM-SW2 have a dedicated Audio Channel and a dedicated CAT to be usable from external application with Visrtual serial ports and Virtual Audio Cables

Selectable Band configuration from 192kHz to 6MHz DDC bandwith  (192,384,768,1546,3072,6144Ksps) 2 channel 192Ksps, 2 channels 384Ksps

RX and TX SPLIT mode operation:  VFO A for RX while VFO B used for TX (with FDM-SW2 simple click operation to change TX frequency)

CW skimmer integration management (DX Spot visualization & tuning capability)

Direct digital Modulation using USB soundcard based on CMedia chipset digitally interfaced with ARM floating point microcontroller and DDS


 Great Review by Bob Nagy AB5N https://youtu.be/Yiw3h-_JAs8

 FDM-DUO quick guide  Open
 FDM-DUO user manual  Open
 FDM-DUO fimware upgrade manual  Open
 FDM-SW2 software user manual  Open
 FDM-SW2 software  Link

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