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With the FDM-DUOr, ELAD was the first manufacturer to offer a modern, flexible and powerful SDR station receiver, which is also well-suited to a PC.
The FDM-DUOr has what many other SDRs miss: buttons. The control elements like a large VFO knob, volume control knob, filter and other functions as well as push buttons for the most important settings, give the FDM-DUO-R the operating concept of a classic table receiver.
If you run the FDM-DUOr via your PC, you have other functions, such as: A up to 6 MHz wide spectrum display, waterfall diagram, recording, decoding and more. The included FDM-SW2 software allows the operation of up to 4 virtual receivers in a 6MHz spectrum. This also makes it possible, for example, to listen to both stations at the same time in the split mode on the amateur radio frequencies.
Both operating modes, table receiver and PC operation can be combined very well. You can listen to stations on the desk while watching the spectrum on the computer. This is very useful, especially with weak signals, which can only be seen in the waterfall diagram.
A very interesting innovation of the FDM-DUO-R receiver are 10 slots for pre-selector boards, which can be populated by the user as needed. Elad offers various high-pass and band-pass filters, for example to suppress nearby medium wave radio stations. Band-pass filters are available for the amateur radio bands and help to achieve excellent large signal handling capabilities, suitable even for contest stations. And users demanding even more flexibility can use two empty boards to design their own filters perfectly matched to their needs. By using a clever combination of the two antenna inputs, attenuators, the standard 54MHz low pass filter and the switchable ten pre-selector positions the receiver design offers a lot of possibilities for individual tuning.
The receive frequency range is from 10 kHz to 54 MHz]. The two antenna inputs are selected by programmable band edges, so the the right antenna and filter module is selected depending on the frequency. A TCXO is used for good frequency stability, the side band noise of the oscillator is a very low -130 to -136dBc, resulting in a low noise floor and excellent sensitivity. Alternatively an external 10 MHz precision clock reference can be used as master clock. Depending on how the FDM-DUO-R is used - with our without computer - different operating modes are available: without computer USB, LSB, CW, AM and FM, with computer additionally WFM and DRM can be received. DRM is available with the supplied software, no complicated installation of additional software is needed.
The nice thing about the FDM-DUO-R is, that it can be used with or without a computer. Without computer the receiver is an excellent companion for the demanding SWL, even when going portable during a vacation. And when working together with a computer the FDM-DUO-R offers modern SDR capabilities like a waterfall display, decoding, recording and much more. The supplied FDM-SW2 software allows the operation of up to 4 virtual receivers at the same time. The manufacturer also supplies an "ExtIO" DLL program, which is required to use the receiver with other software like Bonito RadioCom 6, SDR#, HDSDR and many more.
Further hardware features of the FDM-DUO-R are worthy of professional radios. The precision clock iput was already mentioned. A USB CAT interfave allows remote control with the right software, the CAT protocol is fully documented. A "Mute" input stops the receiver when a nearby transmitter is keyed, providing seamless integration into an existing amateur radio station. The 9 pin extension port is compatible with the existing extension boards by Elad. Connections for headphones and line out are provided. The receiver requires a 13.8V DC supply, max. current intake is approx 500 mA.