> anything more than 50 ms is cause for concern and values exceeding 100 > ms are a red flag. (A related topic is overall delay, which causes > uncertainty over when one speaker stops and other begins. This is a real > problem in tandem satellite links..
Typical 80 ms of latency over the Internet is enough to completely render ear-to-hand coordination with an iambic paddle as "impossible." The latency is effectively doubled when one considers that it may take 80 ms for the key closure to arrive at the transmitter but it takes another 80 ms for the transmitter's sidetone to reach the operator at the remote location for a net delay of ~ 160 ms. To the best of my knowledge, this type of "dual latency" with CW has not been studied in depth. Of course, latencies are dependent on the IP path. When operating from my hotel in Italy last year, latency was approximately double the worst latencies I've measured in NA. When using a manual key or paddle, it necessitates the use of a local sidetone injected into the headphone audio. Some of the QSK attributes are still possible, only Rx audio between keyed elements appear delayed in the headphones. That's not a problem so long as the locally-injected side-tone is synchronized with the sending. By contrast, I've found when using a CW keyboard from my netbook at a remote location, latency is of no consequence since the brain is typing as if writing a paper but the brain does not require audio feedback from the sidetone to keep the typing synchronized. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
