George, Professional audio sound cards rarely have a microphone preamplifier because they are designed to talk to mixing panels that do that. What Eric is saying though is that you do NOT need a preamplifier because we can amplify in the software. Just turn up the front panel Mic control until you get sufficient output. This simply turns up the digital gain (i.e. multiplication).
73, Gerald K5SDR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of George > Heron N2APB > Sent: Thursday, October 20, 2005 7:12 PM > To: [EMAIL PROTECTED]; '' FlexRadio '' > Subject: Re: [Flexradio] Mic problem with D44 card > > Thanks Eric. Sheesh, for a top-quality sound card, I'm > surprised it doesn't have the same capabilities as > lesser-quality ones in this regard. So, for other > applications of a PC sound system like recording voice, etc, > this forces the need for yet another gizmo and set of patch > cables. (An $80 gizmo, no less, for the AudioBuddy they show > in their manual.) > > BTW, what do you guys do for TeamSpeak voice recording? > Without a preamp on the D44, you must have some other > amplification in the system? > > Perhaps answering my own question, is there a way to utilize > the motherboard mic input with the D44 plugged in? (How is > this selected?) > > 73, George N2APB > > > ----- Original Message ----- > From: "Eric Wachsmann - FlexRadio" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; "'' FlexRadio ''" > <flexradio@flex-radio.biz> > Sent: Thursday, October 20, 2005 12:05 PM > Subject: RE: [Flexradio] Mic problem with D44 card > > > > George, > > > > The Delta 44 is expecting a line level input. We get around this by > > providing digital amplification within our program, but > this will not > > work for other applications which do not provide such gain. > The input > > level you saw on the Delta 44 control panel is normal. > > > > Consumer sound cards typically include a Mic preamp (and > sometimes an > > additional 20dB boost). You can buy an external one for > the Delta 44 > > and it _will_ improve the signal/noise ratio when > transmitting on the > > PowerSDR software. It is not necessary, however, thanks to > the power of > > digital amplification (aka multiplication). > > > > > > Eric Wachsmann > > FlexRadio Systems > > > >> -----Original Message----- > >> From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > >> radio.biz] On Behalf Of George Heron N2APB > >> Sent: Thursday, October 20, 2005 8:46 AM > >> To: '' FlexRadio '' > >> Subject: [Flexradio] Mic problem with D44 card > >> > >> I recently upgraded to the Delta-44 sound card and things > are almost > >> working as expected. > >> > >> Things are fine with SDR receive functions and for normal > multimedia > >> playback on the computer > >> (like playing MP3 audio files). But then in testing out > the mic input > >> function in prep for > >> SDR transmit tests, I notice that I just cannot get any audio gain > > like I > >> used to with the > >> Santa Cruz card previously used. I can hardly even get 1/4 scale > > readings > >> in the sound card > >> control panel when speaking loudly into the mic. > >> > >> The mic is proper impedance for "mutlimedia sound cards", > and indeed > >> worked fine with the > >> Santa Cruz card before. The gain setting is indeed "-10dB" in the > > control > >> panel. (I've > >> tried all setting combinations.) > >> > >> Someone had privately suggested that perhaps the D44 > doesn't provide a > >> bias voltage for the > >> mic input, as some/most cards do ... > >> > >> Has anyone else experienced this condition with the D44? > >> > >> Thanks. > >> > >> 73, George N2APB > >> > >> > >> > >> > >> > >> _______________________________________________ > >> FlexRadio mailing list > >> FlexRadio@flex-radio.biz > >> > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > > > > > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > >
