KX3 RX IQ output question
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Wayne, I know you don't have anything to do but answer questions... ;-)
I didn't get a chance to ask this last night during the KX3 webcast: What will be the usable bandwidth of the RX IQ output? Since the dual watch capability is described as +/- 10 KHz, I am wondering if this is the total BW at this output jack. Also, will this be tapped off before the optional roofing filter module? Thanks in advance, Bruce, N1RX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hi,
I am hoping for much more than +/-10kHz. High end sound cards sample at up to 192ks/s and are not that expensive. I'd love to run a panadapter with more than 100kHz total bandwidth. I would also love to see a digital audio stream from the KX3 so I could eliminate the sound card altogether. Obviously that's available somewhere inside the DSP but maybe it's hoping too much that it be formatted into something standard and made available externally. If the $700 price guesstimate I've seen holds and the performance on general coverage is decent, I might be interested in one to replace my web-enabled IC-718: http://ab2tc.getmyip.com:8000/ AB2TC - Knut
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In reply to this post by Bruce Beford-2
Bruce,
What would be the point of tapping IQ after the roofing filter? Somewhere in the posts I thought I read KX3 will use one BPF per band, so the bandwidth probably will cover full band. After that you are at mercy of your sound card. Dual watch is in DSP. The IQ signals should come out before DSP, so the Dual Watch has no bearing on IQ output. By the way, with SDR and this DSP one probably could implement Triple or Quadruple Watch. Question is: where to obtain more ears? :-) 73, Igor, N1YX -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bruce Beford Sent: Saturday, May 21, 2011 12:47 PM To: [hidden email] Subject: [Elecraft] KX3 RX IQ output question Wayne, I know you don't have anything to do but answer questions... ;-) I didn't get a chance to ask this last night during the KX3 webcast: What will be the usable bandwidth of the RX IQ output? Since the dual watch capability is described as +/- 10 KHz, I am wondering if this is the total BW at this output jack. Also, will this be tapped off before the optional roofing filter module? Thanks in advance, Bruce, N1RX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bruce Beford-2
I noticed KE9V's summary said it was 40 kHz (+/- 20 kHz). Since he was there perhaps he heard this from someone at Elecraft's booth: http://ke9v.net/ (Until we hear from the horse's mouth!) 73, Bill |
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Administrator
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It will actually be significantly more than +/- 20 kHz. But the final
spec is TBD. The +/- 10 kHz limitation on dual watch is due to the DSP, not the QSD. (The new DSP in the KX3 has plenty of horsepower for all planned KX3 features, but it is not a fire-breathing monster. We have to keep receive current drain low.) 73, Wayne N6KR On May 23, 2011, at 9:34 AM, Bill W4ZV wrote: > > Bruce Beford-2 wrote: >> >> Wayne, I know you don't have anything to do but answer >> questions... ;-) >> >> I didn't get a chance to ask this last night during the KX3 webcast: >> >> What will be the usable bandwidth of the RX IQ output? Since the dual >> watch >> capability is described as +/- 10 KHz, I am wondering if this is >> the total >> BW at this output jack. Also, will this be tapped off before the >> optional >> roofing filter module? >> > > I noticed KE9V's summary said it was 40 kHz (+/- 20 kHz). Since he > was > there perhaps he heard this from someone at Elecraft's booth: > > http://ke9v.net/ > > (Until we hear from the horse's mouth!) > > 73, Bill > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/KX3-RX-IQ-output-question-tp6389769p6395189.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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