The FDM-DUO that provides an advanced Direct Digital Samplin (DDS) SDR Compact HF 50MHz QRP Transceiver. Covering all bands from 9kHz trough to 50MHz, with 5 watts RF outup and multiple receivers. That can be used in standalone mode (not PC) or it can be entirely computer controlled – The design and build quality is Italian quality !
Standalone Operation – G4WNC, Mike wrote on the RadCom of March 2015: The large knob provides the main tuning and this can be set to operate with a wide range of tuning steps from 1 Hz to 1 MHz . If you’re using the rig in standalone mode, you just need to connect power, antenna and mic/key and you’re in business. (! more: please read the User Manual)
Computer operation – The real flexibility of the FDM-DUO was realised when I combined the rig with the Elad FDM-SW2 SDR Software on external PC – I had access to up to 8 software receivers plus the standalone receiver making a total of nine, which is more thanI could ever use!
G4WNC, Mike wrote: If you were a datamodes fan or contester, you could have one receiver tuned to the PSK band segment and the audio routed to an instance of FLDIGI. You could then have another receiver set to the RTTY segment with a RTTY decoder. You could also have CW Skimmer running on another receiver checking out CW activity on the band. … You could then duplicate this setup on the second DUO channel, which could be tuned to a different band! – (!! nrd…. maybe you need many ears! hi)
The antenna signal is applied to some ESD protection and 5 anti-aliasing filter before being passed to the main analogue to digital converter (ADC). Elad use the popular LTC2165, 16-bit ADC thet’s clock at 122.88MHz to provide confortable sampling (serial data stream runs at just under 2Gb/s) of the entire RF spectrum to 9kHz through to 54MHz.
Elad uses a Xilinx Spartan 6 FPGA and the decimated outup in standalone mode is 192ksps and the tuning range wold be abaut 180kHz (output of the Spartan 6 is passed to an STM32F429 ARM microcontroller) – However, when operating the FDM-DUO using the included FDM-SW2 software, the decimation range can be changed in six steps up to a maximum of 6.144Msps.
[Note] – Detailed specifications: please see the official sources – All specifications are subject to change without notice – All trademarks belong to their respective holders.- This page is just a non-official overview, where no one should draw any conclusions – All images and versions above is for illustration only. (tnx)