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 ''"
<[email protected]>
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
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