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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+QRSS3\s+\"challenge\"\s*$/: 7 ]

Total 7 documents matching your query.

1. Re: LF: QRSS3 "challenge" (score: 1)
Author: "Graham" <[email protected]>
Date: Thu, 02 Feb 2012 19:17:37 +0100
Ah.. missing is the qsb , to remove sections of the plot so these must be ground wave tests :- ) From: [email protected] Rik Strobbe Sent: Thursday, February 02, 2012 5:17 PM To: rsgb_lf_gr
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00080.html (14,149 bytes)

2. Re: LF: QRSS3 "challenge" (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 2 Feb 2012 17:47:47 +0000
RIk - Your challenge assumes we know the meaning of the short and long symbols ;-) Fortunately I do have a cross-reference to hand Andy G8IMR
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00347.html (11,434 bytes)

3. RE: LF: QRSS3 "challenge" (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Thu, 2 Feb 2012 19:19:40 +0100
Hello Graham, maybe that will be the next step. But let's start with something "easy". BTW: I did a test how many bits Opera can miss before decoding fails. Again, starting "easy" just by ommitting t
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00407.html (19,957 bytes)

4. Re: LF: QRSS3 "challenge" (score: 1)
Author: Andy Talbot <[email protected]>
Date: Fri, 3 Feb 2012 15:55:27 +0000
I use a slightly different method of generating noise in software, using the function A = SQR(-2 * LOG(RND)) * SIN(2. pi. RND) which gives a true Gaussian spread with RMS equal to 1 Doubt it makes an
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00585.html (14,216 bytes)

5. Re: LF: QRSS3 "challenge" (score: 1)
Author: Andy Talbot <[email protected]>
Date: Thu, 2 Feb 2012 18:58:28 +0000
I was going to make muttering noises about the S/N being dependent on the QRSS speed, then realised ..... duh.... it doesn't matter! When normalised, -28dB always corresponds to 6dB above the noise b
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00607.html (11,689 bytes)

6. RE: LF: QRSS3 "challenge" (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 3 Feb 2012 15:08:16 +0100
Hello Andy, I just started from SNR (in dB) = 10*LOG(Psignal/Pnoise) Or for SNR = 1 (0dB) ==> Psignal = Pnoise, thus RMSsignal = RMSnoise If the signal is a sine (most obvious) then RMS of the signal
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00712.html (12,964 bytes)

7. LF: QRSS3 "challenge" (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Thu, 2 Feb 2012 18:17:04 +0100
Dear all, as mentioned some days ago I generated a whole series of Opera, WSPR and QRSS3 audio with a known SNR. For Opera and WSPR it was easy to determine the lowest SNR for a proper decode. But fo
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-02/msg00716.html (13,558 bytes)


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