At 01:29 PM 1/9/2012, you wrote:
Hi, My observation of built in sound cards both desktop (also an HP) and laptop (Asus netbook) is that they are not very good from a noise point of view. I have acquired an M-Audio D-44 which i use in my station desktop computer. It is a PCI card with an external breakout box .... making it very convenient from a radio shack point of view. The radio can be almost 5' away from the computer. I have compared it to built in sound cards for recording and digital operations. The D-44 is clearly superior. When operating digital modes I have compared it to the built in sound cards as well as the external units such as the Signalink. The waterfall on the screen is best with the D-44 ... by a long shot ... even when compared to the external units like the Signalink. The M-Audio was originally used by me for music recording ... then it was recruited for my early SDR experiments ... and now it is used for digital mode radio operations. The only shortcoming is that it is far from portable hi. The little Signalink works well with my laptop for portable work ... but not quite as clean as my D-44. M-audio still makes good sound cards (the D-44 is now obsolete). Jim, VE3CI >A lot of computers (especially HP) are notorious for that. It is a hardware >design flaw as Joe W4TV has described. > >If you disconnect the power supply from your laptop (i.e. run on >battery power) >and try it again you'll probably notice a significant improvement in >the noise >level of your recorded audio. What does that tell you? > >I had to resort to using an external sound card to digitize audio >and then suck >it into the computer via USB. Something like the M-Audio or similar >devices that >you can find at Guitar Center for recording musical instruments. Using one of >these the audio is clean. Good luck in your efforts. > >Regards, > >Al W6LX ______________________________________________________________ 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
