Please have I got hold of QSK limitations in SDR,? particularly in QUISK?
?Receive:? before replying I must hear the end of the previous over.? Causality then implies an ultimate limit set by processing power in the computer.? The next limit will be the rx hardware changeover.??
Transmit:? ?for the very first character there is a limit in computer processing.? Subsequently the sending will lag in real time but reception will be continuous.
My practical setup:? HIQSDR or HermrsLite plus linear. Computer Raspberry Pi, mostly, or laptop, Linux.? External keyer direct to hardware.? Obvious limit; relay changeover.? No way around this except diode switching.? Next:? Pi computation - use faster computer.?
To key at 25-30 wpm I believe that a changeover time of a few msec is required.? ?Mine has been more than 1 sec in worst case, just overloading cpu.? Is the only answer to increase computing power?? Should I be able to get down to relay time ??
Do not confuse the real time issue at the start and end of transmission and listening through between characters, this is what matters for QSK, with processing latency in the middle of transmission.??
73 Bob g3udi?
