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M0LTE / pi-transceiver

An attempt to build a complete ham radio transceiver around a Raspberry Pi
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Receive SSB #9

Open M0LTE opened 2 years ago

M0LTE commented 2 years ago

A GNU Radio flowgraph needs developing which demodulates SSB from the set frequency and outputs it to an audio device.

How this interacts with the transmit flowgraph is an unanswered question. Hopefully the two flowgraphs can just be fully independent, with the RX flowgraph being muted during TX, and the TX flowgraph being muted during RX.

G4CDF commented 2 years ago

In order to avoid the transmitted signal interfering with receiver, the transmitter signal must be suppressed during receive. It is not sufficient to rely on hardware

M0LTE commented 2 years ago

@G4CDF Is it likely to be sufficient to mute the TX output in software during RX, or do we need to physically break the connection between the LimeSDR output port and the first gain stage?

(As a reminder, the LimeSDR will likely be permanently in TX, just with zero modulation)

G4CDF commented 2 years ago

I think that as long as the Tx digital signal is zero or low amplitude then the rx chain will not be interfered with. The issue is internal to the LimeSDR hardware not the external amplifiers.