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FDM-77 all mode LW,MW,HF Software Defined Radio Receiver:
The FDM-77 is designed as a "Software Defined Radio". That means that the traditional receiver itself is just a black box, all controls, decoding and audio playback is handled by the attached computer. This makes it relatively easy to add new features and decoding methods, 'just' by changing the software.
The receiver is designed as a triple conversion superhet, in the first IF stage (70MHz) a 10kHz crystal roofing filter is used, in second IF at 455kHz a 4kHz ceramic filter. Seven automatically selected preselector bandfilters add to the excellent figures of 90dB blocking dynamic range and +15dBm IP3. The final IF stage of 12kHz is processed by the soundcard of the computer. Here DSP filters from 250Hz to 10kHz can be selected.
The frequency range of the FDM-77 covers 10kHz to 65MHz.
The software requires Windows XP® or Windows2000®, at least 1.2GHz clock, USB support and soundcard.
Technical Specifications:
RF front-end with SO239 and BNC inputs (for external and indoor antenna);
50 KHz to 60MHz continuous coverage;
1Hz to 1MHz tuning steps and keyboard direct frequency input;
USB 2.0 full speed interface to the PC;
12KHz output to the PC sound card;
ELAD software radio for AM, LSB, USB, FM, CW, DRM demodulation;
Graphical User Interface for W2K/XP environment. |
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