Tag Archives: Elad FDm-DUO

Turn your Elad FDM DUO into a portable receiver, with a 200 metre longwire

As some of the subscribers to Oxford Shortwave Log  will know, I’ve been talking about building a battery pack for my Elad FDM DUO to take it out on a DXpedition. Finally, I found the time to quickly do just that with some parts that cost less than £10 – as the video below demonstrates in more detail. The FDM DUO input voltage is stated as 13.8V and although 12V would probably have been sufficient, a couple of very cheap battery cases later, 9 x 1.5V ‘C’ cells and about 20 minutes of somewhat unpractised soldering did the trick. I have also put together a 200 metre longwire antenna, deployable from a large spool, with a termination connector to add resistor grounding for a Beverage Antenna configuration, should I wish to do so in the future.  I used two spools of 100 metre equipment cable, soldered together and protected with heat-shrink.

Direct link to Oxford Shortwave Log channel

Regular viewers of my youtube channel will know that I spend much of my shortwave listening time out in an Oxfordshire wood where QRM is negligable and Tropical Band stations can be heard with, at times, unprecidented signal-to-noise. This is the first time I’ve used a longwire greater than 100 metres in length, however, to be resonant at two wavelengths for 90 metres and 3 wavelengths for 60 metres was the objective. I hope the already fine Tropical Band listening to be had out in the Oxfordshire countryside will improve further.

Clint Gouveia is the author of this post and a regular contributor to the SWLing Post. Clint actively publishes videos of his shortwave radio excursions on his YouTube channel: Oxford Shortwave Log. Clint is based in Oxfordshire, England.
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FDM-DUO SDR to ship May 2014


I’ve just learned from the Europe-based retailer, WoodBoxRadio, that the new FDM-DUO software defined radio will begin shipping end of May 2014.

If you are interested in pre-ordering the FDM-DUO transceiver, you’ll need to submit a 30% deposit (315 Euro) based on the full price (1,159 Euro). The pre-order price is 1,049 Euro.

Go to WoodBoxRadio for more details.

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WoodBoxRadio announces the ELAD FDM-DUO

(Source: WoodBoxRadio Facebook Page)

ELAD FDM-DUO Preliminay Specifications

ADC Linear LTC2165-16bit 122.88MHZ clock
DDC FPGA Spartan 6 XC6SLX25 + Serial Flash for stand-alone mode.

USB IQ path through CY68013 for RX bitstream (192KHz up to 6.144Mhz single channel and 384KHz dual channel in PC mode)

Stand-alone RX IQ path STM32F4 ARM floating point microcontroller

LCD Controller Keyboard controller LPC1766 Cortex M3

TX modulator use a second STM32F4 Floating Point microcontroller + AD9957 DDS clocked at 368,64 MHz

Clocking source Si5338 drived by 10MHz TCXO or External reference input

TX modulator use I2S sourcing from MIC input (Cirrus CS5346) or USB input (CODEC CM6510B with customized firmware)

The third USB is a FTDI controller for CAT interface

This versatile platform allow transceiving in stand alone mode or in PC mode or in dual mode.

Frequency range: RX 9Khz to 52MHz direct sampling receiver
TX 160m to 6m others frequency to be defined

MDS: -132dBm
BDR: +115dB (500Hz)

Power output 5W
There is available a secondary SMA connector output with 0dBm level for use or as generator
open from 400Khz to 150Mhz (TBD)

2m VHF RTX will be an option as a board to fit (TBD)

The RTX have 2 Antenna inputs and can work as single RTX antenna or separate RX and TX antennas
(selectable by front panel or by CAT)

Standalone MOdes: CW CW+ CW- LSB USB AM

Firmware upgrade:
Cortex M3 by CAT
CY68013 by PC
STM32 RX or TX USB by memory stick through internal dedicated USBs
St-alone PROM TBD

When working in ST-Alone mode it is possible to connect an Android tablet (for example a Samsung Galaxy) to see the 192KHz spectrum and send some commands to FDM-DUO. Connection is made done through USB host of the Android and a TTL FTDI cable to EXTio connector of FDM-DUO

In dual mode PC software can show the 192KHz bandwidth of the FDM-DUO and it possible to demodulate with PC Software and with FDM-DUO with internal demodulator

In PC mode the RX bandwidth may have up to 6MHZ and internal demodulator is disabled.

This is a Software Defined Radio and these mode can be changed depending on new software that will be available from ELAD or for from who want to use Extio Dlls.

For using existing programs like HRD and FLDIGI….It will be very simple to plug the USB for CAT and USB TX like an external sound card.

FDM-DUO will be available also as Receiver only as FDM-DUOr name

From aesthetic point of view the box will be available SIlver or Black.

Price: 1159,00 Euro VAT included
Availability: 2/2014

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