Hi Vojtech, > I built a SoftRock RXTX 40 recently and I am disappointed with its > image suppression when using built in laptop sound card. My ATS-3b is > much better in this regard, being a classic superhetodyne with two > NE612 and 4 crystal ladder filter. Need to say the software that I am > using has very poor IQ calibration.
You might try to use Linrad. It has the image suppression in the frequency domain. As far as I know it can be calibrated to any hardware that is stable vs time although I have not actually tested soundcards that deliver samples incorrectly due to drive routine bugs (since I do not have ane such soundcard.) Linrad is a bit more complicated to learn to use properly but it has sharp tools for interference fighting so it could be worth the investment in time. I have started to write "Linrad for newcomers" as an attempt to make it easier for newcomers, but what you can find today at this link: http://www.sm5bsz.com/linuxdsp/usage/newco/newcomer.htm is far from complete. The main link for Linrad is: http://www.sm5bsz.com/linuxdsp/linrad.htm 73 Leif / SM5BSZ
