You'll get hum if your computer and K3 chassis aren't at the same ground potential. For many, it may be preferable to use the rear panel Line Out, which is transformer isolated.
73, Barry N1EU On Thu, Dec 31, 2015 at 2:15 PM, ab2tc <ab...@arrl.net> wrote: > Hi again, > > BTW, some people have been complaining about 60Hz hum in the audio. I zoomed > in one the low end: > > http://ab2tc.com/k3s_usb_lows.png > > There is absolutely no sign of 60, 120 or 180Hz in this spectrum. I have > also listened to the signal with good headphones and hear no trace of hum. > > AB2TC - Knut > > > ab2tc wrote >> Hi, >> >> Here is the spectrum out of the USB codec with a -73dBm carrier from the >> XG3: >> >> http://ab2tc.com/new_k3s_usb.png >> >> The K3S setting is USB with a passband of 300 to 2400Hz. I left the LINE >> OUT level set to the factory setting (10), and set the recording level >> with the Windows mixer (Win7). >> >> AB2TC - Knut >> <snip> > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3IOB-tp7611605p7612094.html > Sent from the Elecraft mailing list archive at Nabble.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 n1eu.ba...@gmail.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
