Bruce, Geoff and Don, Sorry I am late in replying and thanking all for their help. The little power plant I work at here in South Texas has been demanding my attention with the cold weather here! They didn't build these plants with this kind of cold in mind!
I will give the ideas a try this weekend, and let you all know how it worked out. 73, Jeff N7KRT --- On Wed, 2/2/11, Don Wilhelm <[email protected]> wrote: > From: Don Wilhelm <[email protected]> > Subject: Re: [Elecraft] K2/100 birdie at 28.020 MHz > To: "jeff martin" <[email protected]> > Cc: "Elecraft Discussion List" <[email protected]> > Date: Wednesday, February 2, 2011, 7:54 AM > It may also be helpful to tuck > the ribbon cable and speaker wire up > into the space above the control board. Remove the > right side panel and > tuck the wires in front of the heat sink. > It may not help with this particular problem, but it will > help with > other "noises and funny sounds" on SSB. > > 73, > Don W3FPR > > On 2/2/2011 9:46 AM, Geoffrey Mackenzie-Kennedy wrote: > > Jeff, > > > > I see that Bruce K1FFX has made you aware of Don's > (W3FPR) and my comment on > > the "birdie" that Bruce found on 21029 kHz, which also > disappears when the > > KPA100 is not active. However may I add a little > more. > > > > Don speculated that some of the oscillator energy (HV > Bias oscillator) could > > be picked up by the T/R switch when the KPA100 is > in-line, and I can confirm > > that this is fact. The fundamental and harmonics > generated by this > > oscillator and the assocated voltage multipliers are > also found in many > > other places in the KPA100. > > > > It might be worthwhile to remove the audio leads from > the KPA100 board, i.e. > > those which connect to the K2 and to the speaker, to > see if in your case > > this affects this particular "birdie". The bundle of > pcb traces in this area > > (and other areas) of my KPA100 was quite hot with RF > from the HV bias > > oscillator/ voltage multiplier. > > > > 73, > > > > Geoff > > GM4ESD > > > > > > Jeff Martin N7KRT wrote on Wednesday, February 02, > 2011, at 12:26 AM: > > > > > >> I have a loud birdie at 28.020 MHz on my K2/100. > The KPA100 is integral to > >> the K2. I thought it might be from the 4.0MHz > oscillator on the KPA100, but > >> the birdie does not respond to changes of C27. The > birdie stops when the > >> power is reduced to low power mode. The birdie is > loud...can be heard when > >> the 2nd antenna is selected with no antenna > connected. > >> > >> This may have been covered before, but I seem to > recall that there was no > >> firm resolution? I never reaaly worried about it > for the past few years, > >> but with the solar cycle waxing, I might miss some > DX! > >> > >> Thanks all for any insight. > >> > >> Jeff Martin > >> N7KRT > >> K2/100 #5471 > > > > > ______________________________________________________________ > > 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
