I have so much external **noise** in the shack with whirring fans on the K3 and spinning hard drives that speakers are not seriously used during operation of my K3 station. I am using the BOSE QC-15 noise canceling headphones, with the sensitivity switch set to **high** so the audio control on the K3 is rarely run past 12 noon (with a corresponding reduction in RF gain in an effort to hear weaker CW signals better). If I am not riding the RF gain, the audio is never past 10 o'clock.
Yea, I hear something. It is present on my K3 and not on my friend's (NY6C) rig in an A/B comparison. I hand carried my K3 from California to Utah for the CW Sweepstakes contest last November and compared the two. His was quiet, I heard artifacts on mine, so I am hoping it is a problem with hardware/software and willing to have Elecraft look at it. Jim W6AIM -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brendan Minish Sent: Tuesday, February 24, 2015 10:46 AM To: Elecraft Reflector Subject: Re: [Elecraft] Sherwood Engineering Tests I was one of the people who could most definitely hear the DSP artefacts above 12Khz prior to the DSP low pass filter upgrade. The low pass filter upgrade completely resolved it for me, this along with the various other changes over the years now has the K3 sounding very good to my ears. Do make sure that the speakers and headphones you are using are reasonably efficient so that the K3 can drive them effectively without having to run the AF amp 'flat out' For speakers I use a couple of old Motorola 2way radio speakers (3 Ohm impedance I think). As a headset I generally use a beyerdynmic DT-109 with 50Ohm earpieces, this works wonderfully with the K3 but as I am a fairly soft talker I made up a small preamp for the mic element http://ei6iz.com/?p=28 On Tue, 2015-02-24 at 09:48 -0800, Wayne Burdick wrote: > ... > Or you can add just the audio filter section as a small daughter board > for $39 (K3DSPLPF). > > The upgrade does improve the spectra as viewed on an audio spectrum > analyzer, but many operators won't be able to hear the effects by ear. > Those who can hear them have told us it was a major improvement. > > Wayne > N6KR -- 73 Brendan EI6IZ ______________________________________________________________ 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
