Tom, tnx for the info. Did you tried higher sampling rates already? Or is 48kHz the one you found to be best? 73 Gernot DF5RF
Am 09.06.2012 23:53, schrieb Tom Azlin N4ZPT: > With the KX3 and I/Q audio very nice display of spectrum at 48ks/s. > but the resolution and niceness to me of the SDR on the computer > displays are not very good compared to the P3 display. P3 with K3 is > perfect display out to 200 KHz span. Spectrum analyzer quality > exceeding that of the LP-PAN or other SDR programs in my opinion. But > the P3 does not add extra demodulators. > > So pick what you want. > > 73, tom n4zpt > > On 6/8/2012 5:46 PM, DF5RF wrote: >> Thanks Matt, that fully answers my question. >> >> Anybody out there who used that feature already? I'm interested in >> comparing this to solutions like K3+LP-PAN. >> >> tnx es 73 >> Gernot >> DF5RF >> >> Am 07.06.2012 23:42, schrieb Matt Maguire: >>> The I/Q bandwidth is discussed in the "SDR Applications" section of >>> the manual. I quote: >>> >>> * >>> >>> The RX I/Q outputs from a receiver are not “flat” over an infinite >>> frequency range; the signal-conversion process results in some >>> slope (decrease in gain) as you move farther from the center >>> frequency. In the case of the KX3, the signal will be reduced by >>> about 2.5 dB at +/- 24 kHz, 4 dB at +/- 48 kHz, and 7 dB at +/- 96 >>> kHz. The spectrum amplitude on the display, including the apparent >>> noise floor of the receiver, will “roll off” by these amounts. >>> >>> 73, Matt VK2ACL >>> >>> On 08/06/2012, at 6:49 AM, DF5RF wrote: >>> >>>> The KX3 seems to have direct I/Q outputs to the sound card - which >>>> sounds really attractive to me. >>>> The manual says the span depends on the sound card sampling rate, like >>>> 48/96/192kHz. But it does not tell what kind of band width one can >>>> expect. >>>> As I read further, there seems to be a 15kHz limitation imposed by a >>>> default roofing filter, and this will go narrow automatically under >>>> certain conditions. >>>> Again, what kind of span can I expect, and will it depend on any >>>> filter >>>> settings or not? >>>> Thanks and 73 >>>> Gernot >>>> DF5RF >>>> K2 #2328 >>>> ______________________________________________________________ >>>> 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
