MCHF Shortwave Radio/MCHF V0.7 UHSDR-QRP 1.8-30Mhz HF SDR Transceiver CW SSB AM FM Radio

Changes from V0 6 to V0 7 The latest 0 7 revision follows the 0 6 schematics more or less where mostlymechanical changes are introduced Following is the detailed list of the changes 1 The mcHF with three boards now instead of two The RF board host main power supply RF PA BPFs LPFs RX antenna switching TX preamp and PWR SWR meter circuit RF board PA transistors and low noise linear regulators are mounted flat on the board for full thermal contact with the back of the aluminium case Due to much higher real estates on the RF board all signal flow follows linear path of direction without overlap of low high energy density fields Much more space for expanding the LFP module The new Logics board has the bottom side facing the RF board and it is mostly ground plane except U204 and U207 which removes the need of metal shielding plate All low level RF generation decoding circuits are now moved to the Logics board bundled with the Audio Codec module The LCD is mounted on the Logicboard to minimize interference All clocks DSP and RF are grouped to together for minimizing noise and easier temperature insulation again on the Logicboard New component U700 is added on the Logicboard to provide RX TX switching for the RF circuitry independent of the Audio Codec module signals and at the same time saving extra pin usage from CPU The frequency encoder is plugged to P1c connector on the Logicboard instead of being soldered onto the UI boa