> "Just done a quick 'scope check here using my Microham cw keyer and the results are 'inconclusive'. In qsk the space is actually slightly less if measured from the end of the fall to the start of the rise, but slightly more if the dit is measured across the 'top' ignoring the rise/fall time. I forgot to check using the internal keyer but this seems pretty good to me. Having said all that I see that I have configured my Winkeyer with 3ms 'keying compensation' which was done on the basis of it sounding a little choppy previously..."
I modified my microHam CW Keyer to produce a buffered +5 VDC pulse for triggering a dual-trace scope. The most recent K3 firmware shows that the CW envelope rises ~ 13 ms after external contact closure. And more to the point, the RF envelope matches the duration of the external key closure when measuring from the beginning of the envelope rise to the trailing edge. This closely matches other radios, including many Ten Tec models, and precisely matches the envelope of my Icom 7700 and 7800 (with latest firmware). It's interesting that you use 3 ms of added external compensation as that is my value used on all three transceivers since their envelopes happen to perfectly match in duration. My personal preference would be to have all manufacturers match the envelope time to the contact closure referenced at the time the rise ramp completes, to the beginning of where the envelope begins to fall. If you think about it, the combined rise/fall comprises a full 10 ms in the K3. For that reason, compensation of 3-5 ms sounds less choppy to the ear and more closely matches that of the perfect 1:3 ratio generated by an electronic keyer. Since the required compensation is constant as a function of keying speed, the envelope only needs to be "pulse stretched" to one value, regardless of key speed. Psul, W9AC -- View this message in context: http://n2.nabble.com/K3-Keying-tp840393p841397.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
