Thanks Jim, yes my PX3 was a kit, and I did do the tape removal and check good electrical contacts as I was sure there could be problems. I don't like the design of the case, would have much preferred a diecast box instead of silly thumbscrews and legs that either are too loose or too tight. As you say having PCB mounted connectors with no connection to the case is part of the problem with radiated noise from the cables.
The KX3 was a factory build, bought in UK from W&S, don't know if they build them in the UK or whether they buy them in already built. Others have confirmed that the PX3 is noisy on VHF despite all the good tips you have mentioned. I am resigned to giving up on the KX3 & PX3 for VHF work, which is a pity as otherwise I like it despite it having such poor audio from the built in loudspeaker. OK on headphones, or with a powered speaker though. Trouble is the small neat portable rig quickly becomes a mess of extra cables, filters, copper straps, torroids, copper tape and aluminium foil. Short of taking the PX3 apart and building it in a proper box along with the KX3 to try and screen things I don't think it is going to work out here. Elecraft have previously commentated that it is switched mode regulators in the PX3 that cause a lot of the noise lines, I had hoped that the gain of the transverter would lift band noise sufficiently to obscure them, but I was unprepared for the PX3 noise actually being quite audible in the receiver, not just visible on the display, which is a showstopper. I will speak to Elecraft about it though. Thanks. 73 David Anderson GM4JJJ > > Questions and observations. Questions first. Did you build these units or > were they factory assembled? If you built them, dig you carefully scrape all > the tape from the interior parts of the chassis where they screw together? > Not doing so could be part of the problem. To fix this, you'll have to take > it apart and scrape them. > > Observation. The KX3 has Pin One Problems at most of the connectors mounted > on the left side -- note that only the Mic and Phones jacks are screwed to > the chassis. My PX3 is out on loan, and I don't remember whether our not it > has the same problem. Any cable connected to a Pin One Problem becomes an > antenna to RX and TX any trash. > > Common mode chokes are the band-aid for Pin One Problems. For 2M, the weapon > of choice is one or more Fair-Rite #43 clamp-ons added to the offending > cables. Also, the KX3 chassis should be bonded (short, fat copper) to the PX3 > chassis. > > No guarantee that these measures will fix your issue, but I would try them > before giving up. Also, contact Elecraft support and get them engaged. They > talk do lots of people, and chances are they've seen this before and may know > of a fix. > > See my website for the tutorials about "The Pin One . ______________________________________________________________ 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
