Hi Don, indeed one of the sequencer outputs could also be applied to the TX-INH pin. When we first designed the FA station manager I did not have my K3 yet so did not know much about TX-INH (and never thought about that on my old Yaesu radios, hi). Besides the solution should be usable with *any* available transceiver that's why we chose to go for PTT (or to be more precise: MIC-PTT, Digimode-PTT and CW, depending on the trigger).
Yes, TX-INH is quite comfortable as you can still use the K3's internal voice/cw-keyer and do not need to use some external devices before the sequencer. One of the reasons I designed (and use it myself) another sequencer exclusively for K3 use (including the needed pull-up, etc.). But that only works reasonably well as long as the switching times of LNA/PA are not too high as you will loose/truncate the first cw signs when you need higher switching delays (and thus need to prevent K3 output using TX-INH for longer time then the first cw sign needs). Then it would be better again to use the FA-SM with it's built-in CW buffer that will just send the dits and dahs after everything has switched. But well, isn't it nice to have choices? ;-)) Vy 73, Olli - DH8BQA http://www.dh8bqa.de/ PS: Also see my comment in my reply to Joe - thanks for your great knowledge sharing, guys! :-)) ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: "Oliver Dröse" <[email protected]> Cc: <[email protected]> Sent: Friday, February 03, 2012 1:53 AM Subject: Re: [Elecraft] FW: K3: CW in SSB mode broken? > Olli, > > While your intention may have been for PTT use, and your documentation may > be directed at PTT, the output from the sequencer is effectively an open > circuit (sequence not complete) or a circuit closure (sequence complete). > That is simply a signal - it can be applied to the K3 TX INH input just as > easily as being applied to the K3 PTT. > > If you have an example of how your sequencer output is better applied to > PTT than to TX INH, please tell us. IMHO, the use of TX INH offers a much > greater range of control over the switching events and the emission of RF > from the K3. > > 73, > Don W3FPR > > On 2/2/2012 7:17 PM, Oliver Dröse wrote: >>> While it might be possible to modify control to allow CW in SSB with >>> PTT if PTT and CW were activated at the very same instant (by adding >>> diodes from key in, dit in and dah in to PTT In), that would not fix >>> your issue with a sequencer since the sequencer (and foot switch) will >>> generally set PTT some fraction of a second *before* CW in any case. >> Well, it actually depends on the sequencer, I'd say. ;-)) >> >> Within the "FA station manager" >> (http://www.dh8bqa.de/fa-sm/fa-sm-en.html) I >> designed the sequencer to only switch input trigger = output trigger. >> That >> means if you trigger the sequencer by PTT (i.e. from the mic) it will >> switch >> all stages for pre-amp, amp, etc. and then PTT to TRX as the last stage. >> If >> the trigger is CW then it will switch all stages for pre-amp, amp, etc. >> but >> *not* PTT to TRX but just opens the CW interlock to TRX so the radio will >> not see a PTT signal, only the CW signal. Therefor CW in SSB with the K3 >> works perfectly well even using a sequencer. ;-)) >> >> Nevertheless using TX-INH is probably the easier solution for K3's that >> already have a DVR built in (plus CW anyway). I've designed a solution >> for >> that case, too, but not yet up on my website. >> >> Vy 73, Olli - DH8BQA >> http://www.dh8bqa.de/ >> >> >> >> >> >> ______________________________________________________________ >> 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 >> > > > ----- > eMail ist virenfrei. > Von AVG überprüft - www.avg.de > Version: 2012.0.1913 / Virendatenbank: 2112/4781 - Ausgabedatum: > 02.02.2012 ______________________________________________________________ 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
