Lance, This is the only proper way for serious VHF stations. Use your feedback contact of the final RX/TX coaxial relay (which is most probably mounted in the top of your tower) as a final go for the RF out of the K3 by using the TX-Inhibit Line.
73's Evert PA2KW Cu -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Wednesday, January 14, 2009 23:31 To: [email protected] Cc: Elecraft Discussion List Subject: Re: [Elecraft] Sequencer keying with K3/XV-144 without rigblaster? Lance, It has already been thought of and included in the K3 - see below. I am not sure if you are referring to the KEY OUT jack on the back of the K3 or the PTT jack. The PTT jack is an input - one would plug the footswitch into it, or alternately use the PTT on the microphone or the PTT from the RS-232 input. KEY OUT becomes active as soon as the PTT is activated - there is also a KEYOUT-LP signal on the ACC connector that acts the same as the KEY OUT jack except with a limit of 10 ma. The K3 normally transmits RF after the KEY OUT is active by the amount of time entered into the CONFIG menu TX DLY parameter - that provides a maximum of 20 ms RF delay. For those who need more time that that, there is the TX INH function that can be configured for pin 7 of the ACC connector - it can be configured for either TX INH LO=Inh or HI=Inh. This signal will prevent the K3 from transmitting RF until the inhibit signal goes away. See the K3 Owner's manual page 19. 73, Don W3FPR Lance Collister wrote: > Hi Dave, > > You raise an interesting question....maybe that is the elegant solution to > integrating the K3 into old kluge-like VHF stations with lots of coaxial relays, > homebrew amplifiers, etc. > > PTT output jack on the rear of the K3 could optionally be configured as a > sequencer itself, so it would close an adjustable amount of time (up to a second) > BEFORE any RF would be permitted to be generated after the rig is put into XMIT by > either the microphone/footswicth or the serial port PTT lines. > > Certainly, this option would not be selected by those who want to work QSK! But > they would simply not choose the option. If this option were stored by band, you > could have a built-in sequencer only on certain bands, and QSK on other bands! > With such an option, you would never have to worry about blowing anything up, > regardless of how the K3 incoming PTT line itself was keyed ;-) > > What do you think, Elecraft? VY 73, Lance > > _______________________________________________ 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 _______________________________________________ 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
