The sdrplay is 12 bit so it does not have the dynamic range of lppan and a sound card. That being said I do not see much difference. One ting you will notice is that having such a wide bandwidth does at times give strange behaviours. For example, if I tune to a certain frequency and then use 1.8 Mhz some peaks may not be visible far from the center frequency but then if I tune up or down a few hertz they shiw up and at the same time a click is heard from the k3. I presume bandpass filters may be kicking in. For the full amateur bands, I generally do not see this behaviour.Win4k3 also down samples automatically to maintain resolution.the current api for sdrplay has a minimum sampling rate of 2000000 samples per second. So you need to sample at a high rate and then downsample at the same time with fir filters, so cpu use goes up.The next release of the sdrplay api has built in lower sampling rates so cpu cycles will be reduced. You won't see thus with sdrsharp or hdsdr since they keep one sampling rate and do not downsample. Thus in gneral at an fft of 16384 bins they have a resolution of 120hz or so. Not good enough for hf.. Instead you need to use higher order fft's to increase resolution. They need to be quite high like 132,000 fft's which cause a pronounced delay and much higher cpu usage on older machines.In any case, processing delays and the sdrplay cpu do cause about 1/4 to 1/2 second delays between the sound and the peaks.73
Sent from my Samsung Galaxy smartphone. -------- Original message --------From: John Sweeney <[email protected]> Date: 2016-06-24 3:47 PM (GMT-05:00) To: tomb18 <[email protected]> Subject: Re: [Elecraft] SDR Processing from IF Output Tom, Current happy user of Win4K3 with LP Pan and a EMU 0202 card. Even Windows 10 and works great. But been thinking of trying the SDR Play. Is the SDR Play as good of set up or even better than Lp pan and sound card? Would reduce a few cables at least . John. N3WT > On Jun 24, 2016, at 3:17 PM, tomb18 <[email protected]> wrote: > > HiWin4K3Suite just starting supporting the SDRPLAY device. The device works > quite well offering 1.8 Mhz bandwidth from the if out. It covers 10 khz to > 2.1 ghz.73 Tom va2fsq.com > > > Sent from my Samsung Galaxy smartphone. > -------- Original message --------From: Jerry Moore <[email protected]> > Date: 2016-06-24 3:04 PM (GMT-05:00) To: 'a45wg' <[email protected]>, > [email protected] Subject: Re: [Elecraft] SDR Processing from IF > Output > +1 add me to the conversation please. > > > -----Original Message----- > From: Elecraft [mailto:[email protected]] On Behalf Of a45wg > Sent: Friday, June 24, 2016 2:07 PM > To: [email protected] > Subject: [Elecraft] SDR Processing from IF Output > > Fellow Elecrafters, > I have been experimenting with using the IF out from my K3-S to feed >an SDR Radio which will in turn allow me to perform some real time signals >analysis (including but not only cw-skimmer). I have got the setup working >using some cheap RTL-SDR’s which are not designed for HF bands (but with >slightly different firmware can be make to sort of work - down to 20 Mhz they >are bearable). > > Is anyone else doing this - I would appreciate some feedback (preferably >positive) regarding more suitable SDR receivers ?? > > Please feel free to PM me - I shall post back the boiled down wisdom…. > > 73s and thanks > > Tim - A45WG > ______________________________________________________________ > 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] > ______________________________________________________________ > 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]
