Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| public:radio:topics:arduino:30m_phasing_rx [16/07/26 23:14 BST] – john | public:radio:topics:arduino:30m_phasing_rx [16/07/26 23:28 BST] (current) – [The design] john | ||
|---|---|---|---|
| Line 32: | Line 32: | ||
| Coming soon.... FIXME | Coming soon.... FIXME | ||
| + | |||
| + | The basic format is | ||
| + | |||
| + | * Band pass filter for 30m | ||
| + | * RF amplifier | ||
| + | * Signal splitter to feed the RF ports of a pair of home-made passive 4-diode balance mixers | ||
| + | * the 2 mixers are also fed with 90° I & Q local oscillator signals from an arduino/ | ||
| + | * The outputs of the 2 mixers is a pair of baseband audio signals in quadrature which then pass through the phase-delay circuits | ||
| + | * The 2 paths combine such that the audio from the unwanted sideband is cancelled and audio from the wanted sideband is presented to to an op-amp audio BPF centred on 700Hz. | ||
| + | * Then there' | ||
