On Fri, 15 Jan 2010 19:29:33 -0500, DOUGLAS ZWIEBEL wrote: >Maybe most people simply don't complain?
ALL digital systems have some delay (known as "latency") for two reasons. First, there must be A/D and D/A conversion. Second, any DSP system requires some processing cycles to do what it does. The amount of latency (in msec) depends on the sampling rate, the bandwidth, the number of bits, the speed of the processors, how much processing is going on, and to some extent, the skill of the programmer. If both radios use DSP, their latencies are additive. We humans don't notice the delay unless we have something to compare it to. That can be the live sound of our own voice, or the audio from your transmitter monitored in another receiver. And we're sort of used to delay -- it takes time for sound to travel through the air, roughly 0.8msec per foot (varies a bit with temperature). The internet has a lot of latency -- 50-100msec is typical. This is one of the key issues with a remote station, and it makes contesting from a remote station a real challenge. Internet latencies are additive to the velocity of propagation, and are due to the TCP/IP protocols used to route data packets and the communications between equipment that routes those data packets. 73, Jim Brown K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
