From the manual Set the correct sampling rate. Use of 48 kHz sampling will result in a display of almost 48 kHz: 24 kHz above and 24 kHz below the frequency to which the KX3 is tuned. 96 kHz sampling will yield approximately +/- 48 kHz of spectrum, and 192 kHz sampling will yield a display of about +/- 96 kHz
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Sunday, August 19, 2012 6:54 PM To: WB4JFI Cc: [email protected] 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" <[email protected]> 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:[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 > ______________________________________________________________ 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
