Not really following this thread but I must have some really bad cards from creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz either side of center and my 192KHz cards only get 192KHz total, 96KHz either side of center using my K3, LP-Pan and PowerSDR. Or with any of my SDR receivers and CWSkimmer. Or with any SDR receivers I build and test with Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will provide 384KHz of total audio bandwidth.
73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 9:54 PM To: WB4JFI Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] odds and ends... I don't know the advertized numbers, but Mr. Nyquist aside, there is a reason that two independent experts with panadapter displays (Joe Subich W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a 48 kHz rate will produce a 96 kHz span on the pan display. I do not doubt Nyquist, but I think the treatment of the numbers are a bit different (factor of 2) Could it be due to the two channels? I really don't know the answers and do not have the energy to investigate such things anymore, I just choose to trust the experts who deal with this I/Q stuff on a daily basis. I guess my scientific curiosity has declined with advancing years - it is no longer enjoyable to argue on the basis of observations vs. theory to sort out the differences - that was "fun mind games" many years ago. but today it is no longer a challenge. 73, Don W3FPR On 8/19/2012 5:45 PM, WB4JFI wrote: > Mr Nyquist would be happily surprised at that. With I&Q samples at 48kS/s > each, you get a maximum of 48kHz, or one-half the total bandwidth. Not 48k+48k. > > So, with a 48k sample rate, you will get plus and minus 24k from center. > > Sent from tfox iPad > > On Aug 19, 2012, at 4:33 PM, "Joe Subich, W4TV" <li...@subich.com> wrote: > >>> The sound card's maximum sampling rate will determine how wide your >>> panadapter display can be (in kHz); for example, a sound card capable >>> of sampling at 48 kHz can display slightly less than 48 kHz of >>> spectrum. If you want a wider display, you will have to ensure that >>> your sound card can sample at higher rates. >> A sound card capable of 48 KHz sample rate can display slightly less >> than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz. >> >> 73, >> >> ... Joe, W4TV >> >> On 8/19/2012 4:20 PM, Richard Ferch wrote: >>> Jeff, >>> >>> In addition to the cable, you will also need to be sure that your >>> laptop's sound card accepts stereo input. Panadapter software requires >>> stereo input (I and Q channels). Some laptop input jacks will only >>> accept mono signals, even though the laptop's sound card itself is >>> stereo. My newest laptop, for example, has a TRRS jack for the sound >>> card with a single input line, two stereo output lines, and ground. >>> I have no way to get stereo input into this sound card. An older laptop >>> I have has separate input and output jacks, but while the output jack is >>> stereo, the input jack is mono. If your laptop is like either of these, >>> your only recourse may be to get an external USB sound card with stereo >>> inputs. >>> >>> The sound card's maximum sampling rate will determine how wide your >>> panadapter display can be (in kHz); for example, a sound card capable of >>> sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If >>> you want a wider display, you will have to ensure that your sound card >>> can sample at higher rates. >>> >>> Note that if you need to use an external (e.g. USB) sound card, it may >>> or may not have 3.5mm inputs. For example, I have one with dual RCA >>> phono jacks for its line inputs. With one of these cards, you would need >>> to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA >>> phono plugs for the sound card's input. >>> >>> I don't know whether Radio Shack has the specific cable you would need, >>> but I am sure that they have cables and adapters that could be combined >>> to achieve the desired result. >>> >>> 73, >>> Rich VE3KI >>> >>> >>> WW6L wrote: >>> >>>> Per the manual Iit looks like I would need one of these >>>> >>>> A cable with a 2.5 mm (3/32") plug on one end and >>>> a plug that matches your sound card input on the >>>> other end (typically 3.5 mm [1/8"] stereo) is >>>> required. >>>> >>>> If I want to see a panadapter display on my laptop. >>>> >>>> Where do I get it? >>> ______________________________________________________________ >>> 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 >>> >> ______________________________________________________________ >> 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 > ______________________________________________________________ > 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 > ______________________________________________________________ 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 ______________________________________________________________ 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
