I am implementing these suggestions. I have a balun design 1:1 current choke that I plan to put at the entrance of the shack. I loaned it out but just asked for it back. I will ferrite up the key line to the Quadra amp. I have added some ferrites to the microphone.
Thanks for the suggestions! I will report back if these recommendations help. Thanks, Keith AG6AZ Sent from my iPhone please excuse typos On Jul 27, 2012, at 4:04 PM, "Adrian" <vk4...@bigpond.com> wrote: > > 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:ag...@hotmail.com] > 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" <vk4...@bigpond.com> 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: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Keith Heimbold >> Sent: Friday, 27 July 2012 10:53 PM >> To: d...@w3fpr.com >> 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" <w3...@embarqmail.com> 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:Elecraft@mailman.qth.net >>>> >>>> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
