If you can do it, see if you still have the noise running off a battery. 73, Guy.
On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[email protected]> wrote: > The fans are still but I still hear it. Almost like some switching PSU > noise. > > Adi > 2e0ttx > > On 27/06/2011 15:21, Guy Olinger K2AV wrote: >> >> Check to make sure that the cables routed in front of the fans are not >> touching. A light touch will result in a sound like that. It will >> change or go away with the fan speed. >> >> 73, Guy. >> >> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[email protected]> >> wrote: >>> >>> I have the same thing happening, similar series K3 (5k something) , also >>> assembled in March. >>> >>> Adi >>> 2E0TTX >>> >>> >>> On 27/06/2011 13:38, Joe Harris wrote: >>>> >>>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >>>> March. It makes the sound even if I am in TX test mode. Again, no >>>> performance issues, just a slightly bothersome squeal / whine. >>>> >>>> >>>> >>>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey >>>> Wolf<[email protected]>wrote: >>>> >>>>> First off it was a great Field Day and my new K3 impressed me extremely >>>>> not >>>>> only in performance but in it's functionality. >>>>> >>>>> To kick off Field Day I installed a new KPA100 into the K3. I did all >>>>> the >>>>> necessary TX gain calibrations using a dummy load. >>>>> >>>>> One thing I noticed immediately was that I was hearing a very high >>>>> pitched >>>>> squeal coming from either the PA board or possibly the KIO3 (the board >>>>> the >>>>> amp plugs into). The squeal seems to vary in frequency each time the >>>>> transmitter keys up (can only hear it when the radio is in TX). The >>>>> squeal >>>>> is not very loud but its loud enough for me to hear it if I listen >>>>> closely. >>>>> It doesn't seem to be power related. The squeal is there even if the >>>>> radio >>>>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I >>>>> can >>>>> compare the sound to is perhaps a tiny leak in an air hose. Is this >>>>> typical >>>>> of a bad solder joint or something? >>>>> >>>>> This squeal only pertains to the new KPA100 installation. Before the >>>>> amp >>>>> was installed I didn't hear a thing. >>>>> >>>>> I should also note that nothing appears to be affecting performance. >>>>> Puts >>>>> out 100 watts no problem. Clean modulation, etc. >>>>> >>>>> -------------- >>>>> Geoffrey Wolf >>>>> AB3LS (Amateur Radio Callsign) >>>>> University of Pittsburgh '14 >>>>> [email protected] >>>>> [email protected] >>>>> >>>>> ______________________________________________________________ >>>>> 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 >>> > ______________________________________________________________ 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
