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Re: LF: RE: Opera weak signal Rx

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: RE: Opera weak signal Rx
From: Andy Talbot <[email protected]>
Date: Thu, 2 Feb 2012 21:18:35 +0000
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=gPgMmNmK1HaNK1qppKUelc5Zdl9j48sRSOd6/6oagJI=; b=ttn1kMao17IyMLNxsvEhrwkV1dB+ZcPVC6/KRj0iwyFxzO4J+KdraYijLAO6qbjqaJ G2e5EYSRFG6DeYdW86D+dPL7qojUa1xjqm2NZQ5fz21hxvRPoMJLAqCrw/wgqc3YOtZu d/VUQzYw4DTd4rPzdt+wHflyBiaSABqBPWkeM=
In-reply-to: <BF4A524700075746A6467658DFC7102CB0B68CCD78@ICTS-S-EXC2-CA.luna.kuleuven.be>
References: <372EEAF266214ECDB1E430B737F510BA@GaryPC> <BF4A524700075746A6467658DFC7102CB0B68CCD78@ICTS-S-EXC2-CA.luna.kuleuven.be>
Reply-to: [email protected]
Sender: [email protected] 
Isn't -41dB about right for OP32?
8.192 seconds per symbol, = 0.122Hz,
= 43dB down on 2500Hz.

So +2dB on Noise bandwidth.  Couple of dB low perhaps, but not far out

'jnt


On 2 February 2012 21:06, Rik Strobbe <[email protected]> wrote:
> Gary,
>
> in the little test I did earlier today (sending only the last 96 bits)
> I noticed that Opera reported -38dB while the real SNR was about +15dB.
> I assume that the SNR value gets wrong as a part of the bits get lost (eg.
> QSB).
> In addition Opera gives a 4dB lower value than WSPR.
> The combination may explain -41dB.
>
> 73, Rik  ON7YD
>
> ________________________________
> Van: [email protected] [[email protected]]
> namens Gary G4WGT [[email protected]]
> Verzonden: donderdag 2 februari 2012 21:59
> Aan: [email protected]; LF Group
> Onderwerp: LF: Opera weak signal Rx
>
> Hi All,
>
> Amazing Opera decode of weak signal at -41dB :-
>
> 20:38 136 UA4WPF de G4WGT Op32 3462 km -41 dB in IO83qo, nr Preston.
>
> 73, Gary - G4WGT.
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