Dale Richardson wrote:
The delay of the signal through the receiver is noticeable. I put a Yaesu FT-920 next to the SDR on receive and transmitted cw with another transmitter and the SDR is always a few milliseconds behind. The lag is noticeable enough that it is easy to lose the sync of a dx contact. In essence the SDR is still processing the other stations signal after he has stopped transmitting.
That's exactly what's happening, and it's a *totally inevitable* consequence of the quality of the filters: the lag is in the length of the buffers. That's how FIR filtering works.
The only way to eliminate this lag is to change the hardware/software configuration from being essentially half-duplex to full-duplex. This is not fundamentally a software fix, and no amount of ingenuity will change that.
73 Frank AB2KT
