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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: RE: Re: WSPR -2 SNR |
| From: | "Roelof Bakker" <[email protected]> |
| Date: | Tue, 19 Mar 2013 22:11:58 +0100 |
| In-reply-to: | <173B435C07644894A07F177CB5DC86D5@Clemens0811> |
| References: | <[email protected]> <FFC1611B9A6F4AB69BE4E33D769E1ABA@SV8CSHP> <BE2EB53F93EA48A984BB90D26B5E26D0@White> <CAK59VFPeJ8kzU1kVq_-8q+XVzDZnf2dTV0j7AFpX91wrFvH-0g@mail.gmail.com> <op.wt5atzkqyzqh0k@pc-roelof> <005101ce23fa$952aa840$6d01a8c0@DELL4> <173B435C07644894A07F177CB5DC86D5@Clemens0811> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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Hello Clemens, Thank you for your help. This evening I did a rerun from my PERSEUS recording. This is a bit tricky in regard to timing, however it can be done.Instead of the original bandwidth of 540 Hz, I used a filter bandwidth of 2400 Hz. This time WG2XJM produced a SNR of -28, whilst with a bandwidth of 540 Hz the SNR was -33. The difference is 5 dB.The noise in a bandwidth of 540 Hz is 6.5 dB lower than in a bandwidth of 2400 Hz. Joe mentions a bandwidth of 2000 Hz and then the difference is 5.6 dB, which agrees a little better. Note that decoding was not compromised by using the wider filter.The reason that SNR's below -30 dB are rare, might be that in conventional receivers/transceivers it often is not possible to select a 500 Hz filter in USB mode and shift the passband center 1700 Hz in regard to the (suppressed) carrier. 73, Roelof, pa0rdt |
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