Keith, OK on that. I have had a similar experience; Clamp ferrites on the mic line are beneficial, about 6 or so(wrap the core as much as possible, allowing to shut).
# A series rf choke and 0.1uF bypass(to gnd) at the amp end keyline is beneficial also. Clamp ferrites also on the keyline help if you don't wish to do #. Choking the coaxial feed at the SteppIR feedpoint, and again at shack entry is helpful, if not already done. -----Original Message----- From: Keith Heimbold [mailto:[email protected]] Sent: Saturday, 28 July 2012 8:23 AM To: Adrian Cc: Elecraft Group Subject: Re: [Elecraft] K3 transmit audio cuts out Adrian, I am looking at this as an rfi issue first and foremost. I am going to clean up a little bit inside the shack. That particular K3 has been suffering with unusual noise with my new SteppIR three element that was put up less than a month ago. To answer your question, the K3 was in transmit mode the entire time when the audio was cutting out. Very odd. If it turns out to be not a rfi issue then I will investigate the K3 a little more. I am shipping my other K3 to Elecraft tomorrow for a couple key mods and upgrades (negative ALC and band control which is important to me for a possible future KPA500 purchase) and it will be out of pocket for three or so weeks so I want to make sure that it is good to go. Thanks, Keith AG6AZ Sent from my iPhone please excuse typos On Jul 27, 2012, at 1:16 PM, "Adrian" <[email protected]> wrote: > Keith, From your original post you seemed to say that the signal > output dropped whilst the K3 was still in TX, i.e. you say " during > PTT transmit ". So was the TX indicator active during "my transmit > audio cutting out" ? > > This would indicate no problem with the ptt, but the audio - signal > circuit chain, or rfi issues. Can you clarify please? > > I guess Don interpreted your original post different to myself. I > would test sending dits into a DL for the same period to check power > level consistency before looking at other areas. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Keith Heimbold > Sent: Friday, 27 July 2012 10:53 PM > To: [email protected] > Cc: Elecraft Group > Subject: Re: [Elecraft] K3 transmit audio cuts out > > Hi Don, > > Thanks for the quick recommendation. I will give that a try this morning. > > I did a complete switch out of the headset, PTT switch and adapter and > experienced the same cutout. I did consider this being an RFI issue. I > was doing a bit more ragchewing then usual last night. > > I will try your recommendations and report back. > > Thanks, > > Keith > AG6AZ > > Sent from my iPhone please excuse typos > > On Jul 27, 2012, at 5:48 AM, "Don Wilhelm" <[email protected]> wrote: > >> Kieth, >> >> In cases like that, the first things to check are the external cables >> - in > your particular case, the PTT. >> If you are using the mic jack PTT, try the one on the back panel - if >> that > cures the problem check your cables again. >> >> The other possibility is that something happened in your antenna >> system > and you are experiencing RF feedback. Run the K3 barefoot into a > dummy load > - if the condition persists into a dummy load, then you can conclude > that the K3 might be to blame. >> >> 73, >> Don W3FPR >> On 7/27/2012 8:36 AM, Keith Heimbold wrote: >>> While operating last night on 20m on my K3 serial 1391, I had an >>> issue > with my transmit audio cutting out during PTT transmit. Also power > output simultaneously dropped out completely in mid sentence. I could > see this both on the power meter and hear it on monitor. >>> >>> I currently use a Heil proset 4 and a heil hand switch with that >>> rig. I > then decided to switched headsets and switch to my heil proset 5 and > my foot switch which is on my other K3 to determine if it was an issue > with headset / PTT switch combination. Upon transmitting it continued > to cut out the audio and power. I was alerted by the ham I was > communicating with that I was having an issue with my audio. This > issue continued to persist so I decided to shutdown the system. >>> >>> My configuration last night also consisted of this K3 unit being > connected to my Yaesu Quadra amplifier to my SteppIR three element > Yagi. I was operating at about 500W. >>> >>> This is the first time I have had any issue with this K3 unit though >>> I do > experience some unusual receive issues with spurious and higher noise > levels with this unit versus my other K3 and my KX3. >>> >>> Turns out that I am coincidentally sending up my other K3 1526 to > Elecraft today for several mods and some additional features to be > added. I would like to get the older 1391 unit working before sending 1526 up north. >>> >>> Any thoughts on what might be happening or troubleshooting options >>> would > be great. >>> >>> Thanks, >>> >>> Keith >>> AG6AZ >>> >>> >>> >>> Keith >>> >>> Sent from my iPhone please excuse typos >>> ______________________________________________________________ >>> 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 >>> >> > ______________________________________________________________ > 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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
