Hi Joe, indeed, there are a lot of (but luckily not all) LNAs and PAs needing too much switching time. That's why you will get into trouble with CW with a sequencer behind the K3 even using the TX-INH feature. Therefor we designed the CW buffer into our sequencer as well as a holdtime to avoid relay chatter between CW characters. Then no problems with both problems anymore. The pay-off is you can't use BK anymore, only Semi-BK. But your signal sure sounds much better without truncated CW signs. ;-))
Basically a sequencer should always be installed before the TRX in the chain (so mic/cw-key, then sequencer + LNA/PA, then transceiver). But the TX-INH functions quite well with the K3 and some (most?) Yaesu radios so if LNA/PA switching times are not too high using TX-INH is the more comfortable solution as you still can use the TRX's built-in voice/cw-keyer which is not possible with a sequencer up-front (that's why we designed those right into the box, too, and of course 'cause not every transceiver has those built in ;-)). So to repeat myself: it always depends! ;-)) 73, Olli - DH8BQA PS: Let me also say a big thanks especially to you to you and Don (W3FPR) for your great replays to questions here on the list. A lot of stuff to learn from you guys ... :-)) ----- Original Message ----- From: "Joe Subich, W4TV" <li...@subich.com> To: "Oliver Dröse" <dro...@necg.de> Sent: Friday, February 03, 2012 2:29 AM Subject: Re: [Elecraft] FW: K3: CW in SSB mode broken? > > Oliver, > > > Well, it actually depends on the sequencer, I'd say. ;-)) > > Very good! Unfortunately, most stations I've seen require an > excessive delay (generally the LNA Bypass is far too slow) which > really means "paddle break-in" is not particularly effective > due to truncated/missing initial characters. > > Where intelligent switching is possible it's certainly the right > way to handle the problem. > > 73, > > ... Joe, W4TV > > > 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
