I would take an antenna analyzer and sweep the antenna system (coax with stubs, connectors, etc.) by connecting the analyzer at the xmitter "end" of the antenna system. Disconnect the coax that goes to the amplifier and take that coax and plug it into the analyzer instead and sweep the antenna system with start freq of 3.0 MHz and end point of 8 MHz You should see a "short" somewhere in the 40 meter band, but my guess is that it will not be where you want it to be. IT is important to do this on the antenna *SYSTEM* (coax, connectors, switches, etc.).
Jim W6AIM . -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Monday, February 22, 2016 8:42 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Slighty off topic - 80 meter second harmnic how to stop When I posted on this issue to another list, W3LPL responded that it's fairly common for harmonics with this sort of characteristic to be generated in active electronics like switching power supplies. Sort of identifying which is the culprit and choking every cable connected to it, there's no solution. 73, Jim K9YC On Mon,2/22/2016 8:34 PM, paulb wrote: > For what ever reason the harmonic is still very present..darn.. > oddly has a rasping note not pure carrier. > > A close ham about 400 meters away can also hear the 2nd hamonnic, band > pass in or out makes little change. ______________________________________________________________ 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 jbol...@outlook.com ______________________________________________________________ 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
