Thanks Barry, that explanation helps alot. So I'm assuming that the IF output of the K3 is a very traditional IF as in other radios, ie it's not Quadrature, etc. Would that be correct?
If so, another approach would be to feed into an A/D, and then do the rest in software, ie gnuradio. I wouldn't be surprised to find out that gnuradio already supports similar configurations, including down converting (for certain), splitting and creating the quadrature output (unknown). Sounds like a fun project. Wish I had time to pursue it!! ;) If I'm reading the block diagram correctly, it looks like an 8.125 MHz IF. -Chris On Mon, Feb 16, 2015 at 11:03 AM, Barry LaZar <[email protected]> wrote: > Chris, > If you are going after the K3 IF output, it is a single audio signal at > the IF frequency. You will need to downconvert it to baseband and split it > into two streams, one of which will need to be shifted by 90 degrees. It is > these signals that go to a good sound card for playing. It will be the only > way it will work. The P3 does everything it needs for spectrum display. The > KX3 already gives baseband audio streams that are separated by 90 degrees > meaning all you need to do is feed the streams to your sound card and > operate on it with software. > > 73, > Barry > K3NDM > > > > On 2/16/2015 9:34 AM, Chris Hallinan wrote: >> >> I'm quite interested in experimenting in this area. I've been playing >> around with SDR via gnuradio with a cheap TV tuner dongle. Can >> someone please explain the characteristics of the signal coming from >> the IF Out port on the K3? Is it basically in the audio domain? Is it >> this connector that would plug into the P3? I'd like to experiment >> with viewing the signal spectrum using something similar to gnuradio. >> >> Brian, how did you connect your KX3 to the iPad? >> >> Thanks, >> >> Chris >> >> >> On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth >> <[email protected]> wrote: >>> >>> Yes you can. >>> >>> I used to do this with an iPad (a tablet computer) running iSDR and a >>> piglet connected into the ACC1 jack. I used Hamlog to control the KX3 >>> and >>> iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized >>> computer) instead, though, as its power consumption seems better than the >>> iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't >>> helping me be productive. You can never have too many screens :-) >>> >>> Now I use the PX3 as my panadapter instead of iSDR and can still use >>> another computer to control the KX3 (PX3 has a pass through ACC1 jack). >>> >>> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as >>> this platform can support a number of Ham oriented programs I like to use >>> (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I >>> can use my iPad to VNC into the R-Pi. For field day or more coordinated >>> events, I would just bring a monitor and connect that to the R-PI. >>> >>> regards, >>> Brian >>> VE3IBW >>> >>> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[email protected]> >>> wrote: >>> >>>> Can I use this output to a separate computer as a 2nd receiver while >>>> using >>>> another computer to run HRD etc? >>>> >>>> KD5SPX >>>> Wayne >>>> >>>> >>>> >>> ______________________________________________________________ >>> 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 >>> Message delivered to [email protected] >> >> >> > > ______________________________________________________________ > 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 > Message delivered to [email protected] -- Life is like Linux - it never stands still. ______________________________________________________________ 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 Message delivered to [email protected]
