Do you have AFX "on" and are you looking at I/Q (left/right) from the K3? The capture - including the small "spike" directly between the "real" and "ghost" signals looks like you are trying to process an unbalanced I/Q signal with the resulting improperly nulled image.
73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Alexandr Kobranov > Sent: Wednesday, August 06, 2008 5:53 PM > Cc: 'elecraft Reflector' > Subject: Re: [Elecraft] Re: K3 Audio > > > I just made two basic samples using K3 and TS-850 using Firebox > external soundcard and Winrad SW. > > You can see screenshot from K3 line-out audio on > > http://www.ok1kei.org/K3_audio/line_out_firebox_winrad.jpg > > This is K3 with 400Hz roofing filter on some stable carrier. > LINE OUT setting on level 9. > > Then the same signal with the same af level (no change in Firebox > input mixer settings) with TS-850 > > http://www.ok1kei.org/K3_audio/ts850_af_firebox_winrad.jpg > > This is my TS-850 with 400Hz inrad filter and output from > phones jack. There are also some "ghosts" in af spectrum, > generaly more noisy, but > no "image" of passband af signal visible. > > As I do not believe in overloding of the Firebox soundcard (the same > conditions for both RIGs so if overloded so in both cases...), there > is something to explain. > > Comments? > > Thanks for your attention, > 73! > Lexa, OK1DST > K3/10 #727 > > > > > Alexandr Kobranov napsal(a): > > I can confirm cca 20dB lower level of 3rd harmonics on front panel > > phones output against rear panel line out. Main versus 3rd > harmonics is > > 50dB resp. 7OdB on line-out resp. phones output here. > > Just tried with on-board sound card od my Dell workstation. > > (using Spectran SW and output level adjusted for the same > peak out level > > on Spectran screen). > > Maybe later will try with Firebox sound card which has > better parameters. > > Lexa, ok1dst > > > > Joe Subich, W4TV napsal(a): > >> > >>> There is still a bit of a problem on receive audio. This has been > >>> there for some time and exists in the form of harmonics. The 3rd > >>> harmonic is quite easy to see and repeatable. I used HRD to show > >>> this on the waterfall after a conversation with a friend. You can > >>> clearly see the harmonic at.. > >> > >> You are overdriving your sound card or the line out transformer in > >> the > >> K3. > >> I have measured the third harmonic using an audio spectrum analyzer > >> at both the line out and headphone jacks of my K3. Until > the level > >> becomes excessive (> .7V RMS on the Line Out) the third > harmonic is > >> more than 50 dB down (Line Out) and more than 70 dB down > (headphones). > >> 73, > >> ... Joe, W4TV > >> _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
