On 13/11/17 20:18, Jim Brown wrote: > On 11/13/2017 11:12 AM, Gary Smith wrote: >> For those using WSJT-X, sometimes I find >> the K3s is locked as transmit but there is >> no RF being sent and no Rx from the K3. > > I've been using WSJT-X since it was first introduced several years ago, > and I've never had this problem. I've always used VOX to put the rig in > TX mode, as I do with SSB and all digital modes. I've often run with a > power amp that uses a vacuum relay for T/R switching, and there's > sufficient delay within the K3 and K3s for the amp's T/R relay to switch.
You may be putting the performance of your station at a disadvantage with that approach, compared to using WSJT-X with CAT to keep TX audio in the range 1500-2000 Hz. The roofing filter may have a fair amount of group delay inequality at the edges of the passband, which can lead to inter-symbol interference on digital modes. I don't know how serious, if at all, this is in practice, but I know one very clever engineer who regards it as enough of a problem to have had a custom roofing filter manufactured for his K3 to reduce it. He mainly works EME with JT65. 73, Richard G4DYA ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
