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Message-ID: <5.0.2.1.0.20010324165624.02d3ecb0@highnoonfilm.com>
Date: Sat, 24 Mar 2001 16:59:35 -0600
To: rsgb_lf_group@blacksheep.org,  rsgb_lf_group@blacksheep.org
From: "Les Rayburn" <les@highnoonfilm.com>
Subject: Re: LF: Re: wolf and inputpwr
Cc: lowfer@qth.net
In-reply-to: <000901c0b4a4$cc589ed0$687a37c0@w2ksn>
References: <3.0.5.32.20010322142117.0083bc10@pop3.esoterica.pt> <14gsjv-0BYKP2C@fwd07.sul.t-online.com>
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At 12:55 PM 3/24/01 -0800, Stewart Nelson wrote:
>Hi Uwe and all,
>
>The present implementation of WOLF, unfortunately, has very poor
>dynamic range.  The BPSK signal must be between -20 dB and -50 dB,
>relative to full scale.
>
>If you are receiving your own transmission, or one from a nearby
>station, you may need to reduce the record level by 20 dB to prevent
>internal overload when it starts averaging.
>
>If you are trying to receive a signal buried in noise, you should
>set the record level so that frequent peaks reach -6 dB or higher,
>even if it means that occasional static crashes overload.
>This will ensure that the -50 dB minimum is not a limiting factor.
>
>If your Rx output is dominated by a strong interfering carrier, it may
>not be possible to set the record level high enough.  In this case,
>try to reduce the interference with a narrower IF filter, with a notch
>filter, or by preprocessing the recording through an audio editor
>with filtering features.
>
>Although 8-bit recordings normally degrade the effective S/N only
>slightly, recording in 16 bits can be a big help if the signal is
>mostly QRM, rather than noise.
>
>You will have to live with the dynamic range limitations for quite
>a while, because my priorities are for improving usability and weak
>signal performance.  Sorry for the trouble it has caused.
>
>73,
>
>Stewart KK7KA
>


I think we'd all agree that no apologies are necessary. This software is 
remarkable, and the first
practical application of something that developers have "talked" about for 
years. You are to be
congratulated. Many have mentioned features they would like to see, 
including GUI interface,
real time processing, etc...but I think your priority for development 
should rightly be
weak signal performance.

Thank you again for your efforts that have benefited all of us!

Les Rayburn, N1LF


Les Rayburn, N1LF
4919 Cox Cove
Helena, AL 35080
XMGR 184.8988khz WOLF Mode
1LF 187.300khz

Looking for a challenge? Try the ultimate weak signal mode, on 1750 Meters!
Visit the Noise Floor!
http://www.highnoonfilm.com/xmgr