Yup, I understood what Eric was saying for use with PowerSDR, and that's
good that we can amplify enough in software for the SDR-1000.
Not to belabor a mundane issue, but my question related to using the mic for
non-SDR applications ... like when using Teamspeak. Do you guys use the
motherboard mic input for that purpose or do you have an outboard preamp?
~George
----- Original Message -----
From: "Gerald Youngblood" <[EMAIL PROTECTED]>
To: "'George Heron N2APB'" <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; "'' FlexRadio ''" <[email protected]>
Sent: Thursday, October 20, 2005 8:52 PM
Subject: RE: [Flexradio] Mic problem with D44 card
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 ''"
<[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
>>
>>
>>
>>
>>
>> _______________________________________________
>> FlexRadio mailing list
>> [email protected]
>>
http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
>
>
>
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