Hi Vojtech, My experience with it was strictly anecdotal, and had no noticeable problems on the air on HF compared to the SignaLink, but I did not make any quantitative evaluation other than to notice the absence of the low end noise on the waterfall that my SignaLink has.
I just checked it and do measure a 0.05 ma DC current through the earphones. Too bad - I wonder if the C-Media motherboard chips have the same problem. I finally gave up on clone motherboards - too many other problems! We were using it under Linux because there are too many hardware compatibility problems with Linux recognizing soundcards, but it sounds like even the SignaLink would be a better choice. Since then, we have come out with a Windows version of fldigi which has no problems recognizing soundcards. Thanks for the heads-up, Vojtech! 73, Skip KH6TY Vojtech Bubnik wrote: > > > Hi Skip and others. > > I bought the other USB sound card dongle: > http://www.geeks.com/details.asp?invtid=CL-USCM2&cpc=SCH > <http://www.geeks.com/details.asp?invtid=CL-USCM2&cpc=SCH> > > I was disappointed with it. The microphone input was noisy and A/D > resolution was far lower than 16 bits. I do not remember exactly, I > think it was either 10 or 12 bits. With the noise taken into account, > the input resolution was probably about 8 bits. > > There are no decoupling capacitors on the earphone output. And I don't > think that it is a switched class amplifier or bridge amplifier. The > earphones are grounded to common ground. If the earphones were > plugged, there was DC current flowing through the earphones. It seems > the manufacturer simply saved money and space by sparing two capacitors. > > I dissected one and the second one is still on my shelf unused. > > 73, Vojtech OK1IAK >
