First of all let's be sure we are all on the same page. Please define "Clunks" vs. "Clicks".
While it would be best to find a total cure for the problem, anything that reduces the severity or frequency of them would be most welcome. Darrell VA7TO On March 25, 2007 03:16 am, Geoffrey Mackenzie-Kennedy wrote: > This might be a tough nut to crack in terms of the surgery required. From > a quick thus limited investigation into this "clunk" problem in my K2 I > am reasonably certain that the lack of shielding to protect the VCO and > Reference, together with the lack of suitable interface filtering , is > responsible. I don't think that the BFO is directly involved but I could > well be wrong. In my K2 the "clunks" appear, as you say, in the presence > of strong signals, and are found on every band that I have been able to > check so far, 40m is perhaps the worst case. What appears to happen is > that the strong incoming signals leak into the VCO / Reference area, and > when their composite level exceeds some value, which is frequency and > leakage dependent, attempt to take over control of the VCO which results > in "clunks". The frequency separation between "clunks" is not always 5kHz > but does seem to be related to the frequencies of the incoming signals > which are attempting to take over. I must stress that I have not had the > opportunity yet to undertake an in depth investigation, but I am very > aware of the leakage between the front end and the VCO / Reference from > earlier work with my K2. "Clunks" should not be confused with "Clicks" > whose cause(s) are quite different! > > Here the received individual carrier levels of the BC stations above 7100 > kHz can approach -10dbm / -5dbm with an antenna looking East, and there > are many of them. It is not uncommon for my K2's LO system to lock onto > one of these carriers, and only let go after the receiver has been > retuned about 1 kHz. > > 73, > Geoff > GM4ESD > > Darrell Bellerive <[EMAIL PROTECTED]> wrote: > >I agree that the synthesizer "tuning clunks" every 5 kHz in the presence > > of strong signals needs to be addressed. > > > > I know that Elecraft found that muting the receiver to eliminate these > > noises was worse than the noises, but there must be a solution to at > > least lessen these "tuning clunks." > > > > On March 24, 2007 03:25 am, Dave-Boat Guy wrote: > >> A bare-bones K2 is a fine radio, although there are > >> still a couple of unresolved issues, like the tuning > >> clunks you hear on crowded bands, due to the > >> synthesizer. I'm still puzzled why it hasn't been > >> addressed. > -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
