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Direct conversion HF radio with DDS frequency synthesizer is very interesting concept. OH7SV and OH2NLT are experimenting with such rig. Full stories will become available when project matures. Here we have some preview pictures and material.
 HF Radios : Technical Reference/HF Radios
HF radio modifications , tips & tricks
Direct Conversion HF Transceiver with DDS LO is listed on dxzone.com since 2004-12-05
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