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LF: Re: WSPR SNR

To: <[email protected]>
Subject: LF: Re: WSPR SNR
From: "Markus Vester" <[email protected]>
Date: Sun, 18 Jan 2009 19:47:04 +0100
In-reply-to: <E707ADCA612746D0863345865C2EA00C@JimPC>
References: <E707ADCA612746D0863345865C2EA00C@JimPC>
Reply-to: [email protected]
Sender: [email protected]
Dear Jim,

I would agree on your conclusion. Theoretically, a marginal "M" qrss signal 
with 6 dB SNR in 0.5 Hz noise bandwidth would rank - 
34 - 3 + 6 dB = -31 dB on K1JT's scale, which is related to 2.5 kHz bandwidth. 
But the spectrogram impression may be a little 
"unfair", as a QRSS-3 signal with all the power contained in a single FFT bin 
would certainly appear brighter than this WSPR signal 
which is diluted over 6 Hz.

Kind regards
Markus, DF6NM

----- Original Message ----- 
From: "James Moritz" <[email protected]>
To: <[email protected]>
Sent: Sunday, January 18, 2009 7:23 PM
Subject: LF: WSPR SNR


Dear LF Group,

The attached bit of spectrogram was set up for QRSS3 reception and shows 2
succesfully decoded WSPR transmissions from G4WGT at -30 and -27dB SNR
respectively. I think this shows that this mode should compete well with
QRSS3 for readibility.

So far, I have:

1654   1  0.6   0.503500  0 G4JNT IO90 30
1752 -28  1.0   0.503599  0 G4WGT IO83 37
1758 -30  1.0   0.503599  0 G4WGT IO83 37
1810 -30  1.1   0.503599  0 G4WGT IO83 37
1814 -27  0.9   0.503599  0 G4WGT IO83 37

Cheers, Jim Moritz
73 de M0BMU



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