Cecil, A convenient on-line calculator for signal level conversions is this: <http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/dbconvert/dbconvert.html>
73, Ahti OH2RZ On 15/04/07, Sami Aintila <[EMAIL PROTECTED]> wrote: > Usually for audio applications dBm should be referenced to one > milliwatt into a 600-ohm load. (Your dBm figure is using 50 ohms). In > order to avoid confusion when we're measuring voltages, it's better to > not use dBm at all. For voltages, it's probably easiest to use dBV > referenced to one volt RMS. (There's also dBu which is equivalent to > dBm @ 600 ohms.) > > To answer your original question, while the Delta 44 may not be a > typical sound card, its input range (peak-to-peak) seems to be 11 Vpp. > That's about 5.5 Vpeak, 3.9 Vrms, +12 dBV (+14 dBu). > > The maximum input level is 6 dB lower when using the "consumer" > setting in D44's control panel. And using the lowest setting means > another -6 dB. That would be 0 dBV == 1 Vrms. Maybe that's pretty > close to a "typical" (cheap) sound card. > > 73, Sami OH2BFO > > > On 4/15/07, k5nwa <[EMAIL PROTECTED]> wrote: > > What is the full scale input to a typical sound card? > > > > I'm thinking it's +10dBm or .7V, am I off my rocker? > > > > > > Cecil > > K5NWA > > www.qrpradio.com www.hpsdr.com > > > > "Blessed are the cracked, for they shall let in the light." > > > > _______________________________________________ > FlexRadio mailing list > [EMAIL PROTECTED] > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ > FlexRadio Homepage: http://www.flex-radio.com/ > > _______________________________________________ FlexRadio mailing list [EMAIL PROTECTED] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
