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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
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Date: Mon, 4 Feb 2008 18:56:22 -0000
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Subject: LF: Re: Re: Re:  Mini Whip and local noise
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Hi Roelof, this was not addressed to me but I feel I can maybe contribute
and opinion. I think it all depends on what you are wanting the sound card
to do. If you are using it as the "I/Q converter" in an SDR the the best
card produces the best results. the vital thing here is the noise level
which affects the dynamic range available, then the sampling frequency and
timing.

Your post tends to suggest that the queries are from people using Spectran
to process the audio from a receiver. In this case the achievable dynamic
range can be similar but it is not necessary for detecting small signals
which are essential buried in the noise from the reciever. I have the
internal on-board sound and an PCI M-Audio Delta 44, and I do not think I
could detect any difference when using Spectran. More important things are
keeping PC noise out of the receiver and ensuring the antenna is the
quietest are available to you but providing the highest voltage of wanted
signals.

Cheers de Alan G3NYK


----- Original Message -----
From: "Roelof Bakker" <roelof@ndb.demon.nl>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, February 04, 2008 4:09 PM
Subject: LF: Re: Re: Mini Whip and local noise


Hello Alberto,

Your program Spectran is in wide use amongst NDB chasers.
Someone had the following question:

>>
Does the quality of the sound card influence the decoding or displaying
of signals received or it this all done in the Spectran software? Some
sound cards are available for $20 and others cost over $250. Will the
higher cost sound card produce a better quality of output signal than
the cheaper one? If yes, which sound card do you recommend specifically
for this application of decodind and displaying NDB signals?
<<

Your input will be much appreciated.

73,
Roelof Bakker, pa0rdt



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