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LF: Re: WSPR -2 SNR

To: <[email protected]>
Subject: LF: Re: WSPR -2 SNR
From: <[email protected]>
Date: Mon, 18 Mar 2013 13:03:58 -0400
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References: <[email protected]> <FFC1611B9A6F4AB69BE4E33D769E1ABA@SV8CSHP> <BE2EB53F93EA48A984BB90D26B5E26D0@White> <CAK59VFPeJ8kzU1kVq_-8q+XVzDZnf2dTV0j7AFpX91wrFvH-0g@mail.gmail.com> <op.wt5atzkqyzqh0k@pc-roelof>
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Sender: [email protected]

My receiver bandwidth is 540 Hz.

It has been shown in the past that a receiver bandwidth significatly less than 2500 Hz artificially inflates the reported WSPR s/n.

Jay W1VD  WD2XNS  WE2XGR/2

----- Original Message ----- From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Monday, March 18, 2013 10:07 AM
Subject: LF: WSPR -2 SNR


Hello all,

On the WSPR website,

http://physics.princeton.edu/pulsar/K1JT/wspr.html

I find this statement:

The program can decode signals with S/N as low as -28 dB in a 2500 Hz  bandwidth. 
<<<

I have been looking at decodes on WSPR Spots

http://wsprnet.org/olddb

and it appears that on bands from 160 m and up a SNR smaller than -25 dB  is a 
bit rare.
On 630 m these low level decodes are found more often, though decodes with an SNR of -30 are rare.

In the nigh of Saturday to Sunday, I had 14 decodes from WG2XJM.
Two of these showed a SNR of -33 dB.
I have never seen such a low SNR before and a search through the WSPR Spots database showed a decode from a French listener of WG2XJM with an SNR of -31, which is the lowest SNR I could find.

As far as I know the bandwidth of the WSPR decoder is set to 200 Hz, so as long as the receiver bandwidth is larger than 200 Hz, decoding should not be effected. My receiver bandwidth is 540 Hz.

So, has anyone an idea what is the cause of these low level WSPR decodes.

Best regards,
Roelof Bakker, pa0rdrt




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