You're comparing apples to oranges, Joe. PowerSDR and other SDR apps which use sound card interfaces have to process a whole lot more data than the K3 does. So do the sound cards and their drivers. The K3 is concerned with the speech passband, while many of the SDR apps process hundreds of kHz worth of bandwidth in realtime.
For kicks, I just ran a quick test using LP-PAN/PowerSDR-IF v1.19.02. I compared the timing of the K3 output to the PC sound card output for 7 different sound cards on two PCs, an older P4 desktop and a year old, dual core laptop. I also tried several different SDR apps, but not all the apps were capable of providing sound card output with all the cards. I used 192 kHz sampling whenever possible, with a buffer setting of 2K and ASIO driver. In general, I found a delay range of about 15-30mS, depending on card, app and sample rate. With the popular E-MU 0202 USB card and PowerSDR-IF at 192 kHz using the standard settings, the result was 21mS (1/50 of a second) on my laptop. PowerSDR was no worse than the other apps. The delay has never really bothered me. I don't listen to both the K3 and PowerSDR at the same time... at least not the same signal. I mainly listen to PowerSDR in MultiRX mode when running split so that I have dual receivers, or when listening to AM broadcast. Otherwise, I just listen to the K3 and use PowerSDR only as a pan display. Contrary to your comment that PowerSDR is the worst part of the Flex radios, a lot of Flex owners only migrated to the K3 after seeing that they could still use PowerSDR, which was their favorite part of the Flex radio. I have heard this comment more times than I can count. 73, Larry N8LP > Don't forget that the LP Pan allows you to run the SDR-IF > software suite. Why would you brag about bringing the worst part of the Flex-radio to the K3? PowerSDR is the worst interface in the world for a radio ... the FFT delays make the K3 monitor sound instantaneous. 73, ... Joe, W4TV -- View this message in context: http://n2.nabble.com/Elecraft-P3-panadapter-at-the-Orlando-Hamcation-tp4564111p4569459.html Sent from the [K3] 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
