Message-ID: <008901c86776$40e2daf0$0300000a@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <NKEMLGOEKANPNJOBFBAFGEKDCJAA.g4wgt@tiscali.co.uk> <016101c61d02$12ceca40$2101a8c0@pcroelof> <43CFCE5D.5000504@usa.net> <20060119232216.u1kyilxv57r4scgg@webmail.versatel.de> <43D0258B.2000601@usa.net> <43D027B8.1000300@usa.net> <43E7DF30.2060108@usa.net> <002501c86748$60c727f0$2101a8c0@PCRoelof> <001301c8675f$b3a5ca00$0900a8c0@Lark>
Date: Mon, 4 Feb 2008 21:38:14 -0000
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Subject: LF: Re: Re: Re: Re:  Mini Whip and local noise
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..
----- Original Message ----- 
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, February 04, 2008 6:56 PM
Subject: LF: Re: Re: Re: Mini Whip and local noise


> 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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