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
