Return-Path: Received: from rly-md03.mx.aol.com (rly-md03.mail.aol.com [172.20.29.141]) by air-md04.mail.aol.com (v121.4) with ESMTP id MAILINMD042-8f547e57d9a1ec; Sat, 22 Mar 2008 17:44:15 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md03.mx.aol.com (v121.4) with ESMTP id MAILRELAYINMD035-8f547e57d9a1ec; Sat, 22 Mar 2008 17:43:56 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JdBUo-0007JP-S0 for rs_out_1@blacksheep.org; Sat, 22 Mar 2008 21:43:22 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JdBUo-0007JG-6D for rsgb_lf_group@blacksheep.org; Sat, 22 Mar 2008 21:43:22 +0000 Received: from ug-out-1314.google.com ([66.249.92.170]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JdBUh-0007MA-9u for rsgb_lf_group@blacksheep.org; Sat, 22 Mar 2008 21:43:22 +0000 Received: by ug-out-1314.google.com with SMTP id a2so2243114ugf.13 for ; Sat, 22 Mar 2008 14:43:09 -0700 (PDT) Received: by 10.66.252.18 with SMTP id z18mr3387225ugh.37.1206222189769; Sat, 22 Mar 2008 14:43:09 -0700 (PDT) Received: by 10.66.244.4 with HTTP; Sat, 22 Mar 2008 14:43:09 -0700 (PDT) Message-ID: Date: Sat, 22 Mar 2008 21:43:09 +0000 From: "Andy Talbot" To: rsgb_lf_group@blacksheep.org In-Reply-To: <014401c88c61$124d6ec0$0d00000a@AGB> MIME-Version: 1.0 Content-Disposition: inline References: <000f01c88a93$d7067790$0d00000a@AGB> <008601c88c34$1c6d43d0$0d00000a@AGB> <000d01c88c35$f0efecb0$6401a8c0@wgt01> <009e01c88c3b$6436ef20$0d00000a@AGB> <00c401c88c4d$54318100$0d00000a@AGB> <00e801c88c52$e2f1bf40$0d00000a@AGB> <014401c88c61$124d6ec0$0d00000a@AGB> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : ? X-Mailer: Unknown (No Version) Set the new freq just after you announced the QSY, and get the occasional demod at DF = +430Hz which is correct for 1700Hz sync. But S/N has fallen and is now in the region of -30dB S/N so oughtn't really to expect a decode. Assuming JT65A is 3dB better than the B version, a S/N of around -25dB ought to be the threshold based on past experience. I'd know better if you could generate 3dB more signal :-) Andy G4JNT On 22/03/2008, Graham wrote: > Ok Andy, > > Well its decoding off air ok at my qth , keying looks ok offair and at > birmingham , > im running 10 watts per tone (20 watts peak during dual tx) > > I have just made a qsy inside the passband , to set the jt65 above the wspr > signal , > jt65 now using sync tone 1700 Hz dial freq still 501.5 usb > > Im not sure if wspr and wsjt6 will run at the same time , but I can try over > the wekend > if needs be , ive just downloded the windows version of wspr .. but not > sorted out the > soundcard yet as he's using , 0123 ... very trad hihi > > > Tnx - G .. > > > > > > ----- Original Message ----- > From: "Andy Talbot" > To: > Sent: Saturday, March 22, 2008 8:28 PM > Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz > > > > Very Interesting. In the WSJT user screen there are several sucessive > > -19dB S/N individual listings and, out of 70 sequences, it has > > selected 22 of them as being valid, but not one single correct decode. > > Experience on JT65B receiving the GB3RAL and GB3VHF beacons shows > > that -19dB S/N will give perfect copy, and -22dB will decode after two > > or three averaging sessions, so there's something very odd going on. > > What I can make out on the spectrogram, the sync tone is in > > more-or-less the righ place. > > > > Your WSPR signal is just 3 Hz low, and the JT65A sync tone about 15Hz > > lower that stated, which is more than near enough for a valid decode - > > and the user screen shows its doing just as it should - with some > > strong enough individual demods BUT NO DECODES - why???????????????. > > > > Do I understand you are not using the actual WSJT software to encode > > the data? Are you actually sure the MultiPSK implementation is doing > > its job properly. > > Try WSJT 5.98 > > > > Andy G4JNT > > > > > > On 22/03/2008, Graham wrote: > >> Ok Andy, > >> > >> Looks like making headway .... > >> > >> I'm using multipsk (the test version) which has jt65-modes .. and for > >> want > >> of a better way of describing the frequency ..sorry if it sounds a 'cb' > >> like ... but .. ' The purple line' is set at the 1000 Hz mark on the > >> waterfall display giving 1002 hz showing on the l/h fequency window > >> ...as > >> you say is 270 hz (ish) from the normal point ... but if you set the > >> prog > >> to that point , means you can engauge the narrow filter > >> > >> WSPR is running at 1500 Hz tone o/p giving 503.00 khz rf carrier > >> frequency > >> > >> I though jt65 would of out performed wspr ...be intresting to see the > >> parallel decodes > >> > >> Tnx - G .. > >> > >> > >> > >> > >> ----- Original Message ----- > >> From: "Andy Talbot" > >> To: > >> Sent: Saturday, March 22, 2008 7:03 PM > >> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz > >> > >> > >> > Hi Graham > >> > Yes, I've got the right sequence time and am running WSPR and WSJT > >> > 5.98 in parallel. Surprising the WSJT averaging won't extract a valid > >> > decode. Some of the sessions are being tagged as having the sync > >> > detected, with a resulting 2.5kHz S/N in the --25dB ballpark, but they > >> > don't want to seem to be pulled together by the averaging. The DF > >> > figure is coming up as -285Hz, suggesting you're 15Hz lower than > >> > advertised (should be -270Hz) > >> > > >> > Do have very bad QRM here. I've just gone over to th the old 137kHz > >> > antenna minus its loading coil rather than the HF vertical that was > >> > the existing 500kHz Rx. The LF Tee is further from the house and > >> > there is about 10dB less localised E field noise. Its a pity about > >> > the deliberate jamming taking place just above the upper tone > >> > frequency. I'm not sure how well JT65 can cope with that. > >> > > >> > Update on the WSPR decodes below - it really does seem a very good > >> > weak signal mode. I'm just about to write June's Data Column for > >> > radcom. I'll give WSPR a section having now played with it for a > >> > while in real hard off-air conditions > >> > > >> > Andy G4JNT > >> > > >> > c:\WSPR>wspr Rx 0 > >> > 1750 8 -17 -0.1 0.001487 G0NBD IO83 37 28.3 > >> > 1752 6 -18 0.1 0.001487 G0NBD IO83 37 28.3 > >> > 1754 5 -20 0.0 0.001487 G0NBD IO83 37 28.2 > >> > 1756 3 -20 0.1 0.001487 G0NBD IO83 37 28.4 > >> > 1758 8 -18 0.1 0.001487 G0NBD IO83 37 28.9 > >> > 1800 8 -14 -0.3 0.001487 G0NBD IO83 37 30.1 > >> > 1802 1 -24 0.0 0.001487 28.7 > >> > 1804 4 -20 -0.2 0.001487 27.5 > >> > 1814 3 -22 -0.2 0.001487 28.1 > >> > 1816 1 -23 -0.6 0.001487 27.9 > >> > 1818 4 -24 0.0 0.001487 27.8 > >> > 1820 7 -19 -0.4 0.001487 G0NBD IO83 37 27.4 > >> > 1822 3 -24 -0.1 0.001487 27.6 > >> > 1828 2 -24 -0.3 0.001487 20.1 > >> > 1830 5 -23 -0.2 0.001487 G0NBD IO83 37 27.2 > >> > 1832 4 -20 -0.1 0.001487 G0NBD IO83 37 24.6 > >> > 1834 4 -24 -0.3 0.001487 G0NBD IO83 37 21.9 > >> > 1836 5 -23 -0.2 0.001487 G0NBD IO83 37 22.8 > >> > 1842 2 -24 -0.3 0.001487 G0NBD IO83 37 23.2 > >> > 1844 1 -26 -0.3 0.001487 22.3 > >> > 1848 7 -19 -0.2 0.001487 G0NBD IO83 37 21.9 > >> > 1850 2 -24 0.0 0.001487 24.0 > >> > 1852 7 -19 -0.1 0.001487 G0NBD IO83 37 27.3 > >> > 1854 5 -19 -0.1 0.001487 G0NBD IO83 37 23.5 > >> > 1856 3 -19 -0.1 0.001487 G0NBD IO83 37 24.9 > >> > > >> > > >> > > >> > > >> > > >> > > >> > On 22/03/2008, Graham wrote: > >> >> Ok Andy, > >> >> > >> >> Thanks for taking a look , the jt65 been running for a while now , did > >> >> you > >> >> have > >> >> the 2 systems on when you decoded the wspr signals ? > >> >> > >> >> jt56 is sending at even mins , check the birmingham grabber , should > >> >> show > >> >> the 2 tone sets > >> >> > >> >> Tnx > >> >> > >> >> Graham , > >> >> > >> >> > >> >> > >> >> > >> >> ----- Original Message ----- > >> >> From: "Andy Talbot" > >> >> To: > >> >> Sent: Saturday, March 22, 2008 6:17 PM > >> >> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz > >> >> > >> >> > >> > > >> > > >> > > >> > > >> > -- > >> > No virus found in this incoming message. > >> > Checked by AVG. > >> > Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date: > >> > 3/21/2008 > >> > 17:52 > >> > > >> > >> > >> > >> > > > > > > -- > > Andy G4JNT > > www.scrbg.org/g4jnt > > > > > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG. > > Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date: 3/21/2008 > > 17:52 > > > > > > > > -- Andy G4JNT www.scrbg.org/g4jnt