True, and thanks for the clarification. My CW PTT for the K2 does not address a situation where the K2 is keyed by its internal commands - it only works with hardwired inputs to the K2 key jack. How many folks using or contemplating SO2R are using the KY commands for keying?
73, Don W3FPR > -----Original Message----- > > Don replied (and I trust will not mind my keeping it on the list, as > my intention is more than helping him): > > >Thanks for your analysis. > > > >One point though worthy of mentioning - the K2 will not produce RF until > >keying takes place, so my solution does the job quite nicely by simply > >inhibiting the keying. > > > >In many applications where the computer does both the keying and > the 'PTT', > >everything will sequence fine if the 'PTT' is simply not > connected to the K2 > >(but connected to everything else - The RF path will be > completed before the > >program begins keying). The only problem that will occur is > when the K2 is > >keyed directly by the paddles instead of through the computer control. > > > >Bottom line, many situations do not really need the CW PTT, but > >unfortunately, SO2R operation where the steering is done through > PTT is not > >one of those situations. > > Effectively ANDing a 'PTT' line with the key line doesn't do much towards > stopping the radio from transmitting when 'PTT' is unasserted if the radio > is doing the keying. A possible situation for this is where the > K2 is used > as a remote base & one wants to have a fail-safe should one want to not > keep transmitting into something that has gotten ugly (failed amp, > antenna, antenna switch, etc). Even this radiosporting enthusiast can > envision using his K2 with the KY command this way - I may one day > soon only be able to operate with such a remote station & is one reason > I bought a K2. > > Such a summary "unhappiness" alarm could also be used to > implement the sort of positive control I think I would have to have > on a remote base if I were to do this back in USA (though the rules may > have changed since I left, it really is a good thing to do any way). > > I use a popular antenna matrix switching product that I think could tell > me when it hasn't really switched due to how its way of doing interlock > between its two ports (used for two radios) can become intermittent. I > would like use this to stop _all_ of my radios from transmitting under > _any_ circumstances when I get around to figuring out a way of putting > an unhappy light in the matrix. > > Some folks do not use logging programs that send CW for them. A > toggle or foot switch can just as easily drive switching of key, mic, > PTT & audio between two rigs in an SO2R contesting station. Other > folks - at one time, myself included - will have nothing other than a foot > switch determining if their station is in transmit or receive mode. > > So like how radios might be used, there is more to CW 'PTT' to > consider. That's why I didn't go further with the mod you have kindly > put forward - it's better done in code. Another one high on my list is > filter selection - anyone who has heard what after-market filters can > do to a radio can probably appreciate what it's like to sit on an INRAD > prototype for the K2 & not be able to use it. ;^( > > 73, VR2BrettGraham > > _______________________________________________ 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
