lør, 14 08 2010 kl. 13:57 +0000, skrev g4ilo: > I had one that looks exactly like that though it was sold under another name, > and I could not decode 300baud packet at all with it. When used to play back > recordings of very weak EME CW all I could hear was band noise. > > I did try it on my Echolink node for a bit with no apparent problems. So my > opinion is that while these cheap USB sound devices may work fine for normal > computer audio they are not a good idea at all for digital modes. You may not > even realize why it isn't working, or what weak signals you are missing. > > Julian, G4ILO >
In my experience most of the inexpensive USB sound devices I have tested contains either the C-media, "USB Headphone Set" or "USB Audio Codec" chip sets, all three yields a signal to noise+signal span of at least 100dB (I've seen as high as 112dB). In any case they are more than good enough for the most demanding digital modes - even EME! Vy 73 de OZ1PIF/5Q2M, Peter ***************************************** ** Genius is one per cent inspiration, ** ** and ninety-nine per cent ** ** perspiration. ** ** -- Thomas A. Edison ** ***************************************** email: peter(no-spam filler)@frenning.dk http://www.frenning.dk/oz1pif.htm Ph. +45 4619 3239 Snailmail: Peter Frenning Ternevej 23 DK-4130 Viby Sj. Denmark *****************************************
