Return-Path: Received: from mtain-ma02.r1000.mx.aol.com (mtain-ma02.r1000.mx.aol.com [172.29.96.10]) by air-db10.mail.aol.com (v126.13) with ESMTP id MAILINDB104-869e4b58d9643ad; Thu, 21 Jan 2010 17:47:00 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 50F4E38000197; Thu, 21 Jan 2010 17:46:58 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NY5mh-0008U2-US for rs_out_1@blacksheep.org; Thu, 21 Jan 2010 22:45:51 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NY5mh-0008Tt-3f for rsgb_lf_group@blacksheep.org; Thu, 21 Jan 2010 22:45:51 +0000 Received: from mail-fx0-f217.google.com ([209.85.220.217]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NY5mf-0001EC-Dx for rsgb_lf_group@blacksheep.org; Thu, 21 Jan 2010 22:45:51 +0000 Received: by fxm9 with SMTP id 9so608904fxm.30 for ; Thu, 21 Jan 2010 14:45:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=Nx6qioKZ7vCZa20NPQL/c4csQQn4Ndzoiug1Rmy5NE4=; b=PPArGzR7NGupWffUBObIrzPV79PQMwo+AAA88tdYc438oTxyOV3caRSVVtmTQ8CHHW uZl+bi0DmxTnmvGCH81cUCHFwXrF7qY9FyBaT/zGPAGv3vpkwAlslRyvuslWcWd/tCkI egTlvecoRME0CCmr58LzcS8fmAxvehH6Wstq8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=nXXMz880vTnz3/3/Co5ToxHNgtKZK5oMmOzAnuwWdqe2CycMArO9Zqg6UA0vixaYZe t/SEn4l4EhqLWISQ3q5HL/SIxJkh7K1h1gAg3QAFEENuUiiHNpbLbbofryZwCO3D05M3 VLeA3DDXBPluo7MNBL1SyE/kcUVA3J4UKPtK0= MIME-Version: 1.0 Received: by 10.239.186.133 with SMTP id g5mr236943hbh.182.1264113942777; Thu, 21 Jan 2010 14:45:42 -0800 (PST) In-Reply-To: References: <1f0624b91001211103t1d10c850t4577a5dc7f0bde62@mail.gmail.com> <1f0624b91001211310g2ba4828bv40ecc6879a617ae7@mail.gmail.com> <1f0624b91001211345l515b4eabm1e33b2b6c27143af@mail.gmail.com> <1f0624b91001211410t4aa2363au5f926674702f514f@mail.gmail.com> Date: Thu, 21 Jan 2010 22:45:42 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: 500 kHz WSJT JT4A Content-Type: multipart/alternative; boundary=001485f4533483d159047db476a1 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE 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-global-disposition: G x-aol-sid: 3039ac1d600a4b58d9622252 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --001485f4533483d159047db476a1 Content-Type: text/plain; charset=ISO-8859-1 Also, Gary, what frequency Tol setting do you have? I see Jim's freq reading is -77Hz, so if you have Tol set to 50Hz, for example, it'll miss Jim's signals. It defaults to 400Hz at startup, so a lower value will have to have been set somehow. Andy www.g4jnt.com 2010/1/21 Andy Talbot > Ah... > I wonder. > > Jim's DT setting for your sigs is around +2 seconds. Which means in the > opposite direction it would be -2s. This is a bit marginal. The WSJT > modes were designed originally for EME, and I *think* the acceptable time > window is assymetric, being around 2s negative and up to 6s positive to > allow for the EME delay. > > But if you're decoding JT65A on HF all OK, not too sure - depends if it has > the same time-search margin. Would have thought it does. Unless Jim's > timing is out.....? > > Just a thought. WSPR is probably more tolerant of timing and it certainly > doesn't need to be assymetric in its search. > > Andy > www.g4jnt.com > > 2010/1/21 Gary - G4WGT > >> OK Andy, >> >> Any suggestion is welcome but yes I do have it set for JT4A, I am >> currently on 80m decoding fine with JT65A. >> >> Looked at the Rate in & out in setup/options & are both set for 1, the >> rate shown at the bottom left is usually very close to 1.0003. I would say >> that is OK. >> >> I will try again tomorrow. >> >> Thanks again. >> >> Gary - G4WGT. >> >> 2010/1/21 Andy Talbot >> >>> may be egg-sucking-lecture, but you have got JT4A set haven't you?. Not >>> B...G. >>> >>> Andy >>> www.g4jnt.com >>> >>> 2010/1/21 Gary - G4WGT >>> >>>> Andy, >>>> >>>> You wrote :- >>>> Watch & check your sampling rate calibration. for this mode. >>>> >>>> Is that displayed in the box at the bottom left, if so then it is always >>>> within the recommended figures. I read in the user guide to watch those >>>> figures for stability & I have never seen it go outside the range specified >>>> in the manual. >>>> >>>> There is an "Enable Diagnostics" in the setup menu but no description in >>>> the use guide (WSJT6), it must be an addition in 7.03 but not documented. Is >>>> that of any help to me? >>>> >>>> 73 >>>> >>>> Gary - G4WGT. >>>> >>>> >>>> 2010/1/21 Andy Talbot >>>> >>>> Watch & check your sampling rate calibration. for this mode. >>>>> >>>>> Andy >>>>> www.g4jnt.com >>>>> >>>>> This email has been scanned for damaging side-effects by the health and >>>>> safety police, is guaranteed to contain no substances hazardous to health, >>>>> but may contribute to dissolving the nether and polar regions >>>>> >>>>> >>>>> 2010/1/21 Gary - G4WGT >>>>> >>>>>> LF, >>>>>> >>>>>> Station calling about 503.670 kHz but no decode. Not sure why :-(( >>>>>> >>>>>> Gary - G4WGT. >>>>>> >>>>>> >>>>>> >>>>>> 2010/1/21 Gary - G4WGT >>>>>> >>>>>>> LF, >>>>>>> >>>>>>> I am currently transmitting a WSJT JT4A test signal on 503.600 kHz at >>>>>>> each even minute, the ERP is estimated at 200 mW. >>>>>>> >>>>>>> In a while I will change the message to a CQ call & watch for any >>>>>>> JT4A replies. >>>>>>> >>>>>>> 73, >>>>>>> >>>>>>> Gary - G4WGT. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> > --001485f4533483d159047db476a1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Also, Gary,
what frequency Tol setting do you have?=A0=A0 I see Jim's freq re= ading is -77Hz, so if you have Tol set to 50Hz, for example, it'll mis= s Jim's signals.=A0
=A0
It defaults to 400Hz at startup, so a lower value will have to have= been set somehow.
2010/1/21 Andy Talbot <andy.g4jnt@googlemail.com&g= t;
Ah...
I wonder.
=A0
Jim's DT setting for your sigs =A0is around +2 seconds.=A0=A0 Whi= ch means in the opposite direction it would be -2s.=A0=A0 This is a bit ma= rginal.=A0=A0 The WSJT modes were designed originally for EME, and I t= hink the acceptable time window is assymetric, being around 2s=A0nega= tive and up to 6s positive to allow for the=A0EME delay.
=A0
But if you're decoding JT65A on HF all OK, not too sure - depends= if it has the same time-search margin.=A0 Would have thought it does.=A0= =A0 Unless Jim's timing is out.....?
=A0
Just a thought.=A0=A0 WSPR is probably more tolerant of timing and it= certainly doesn't need to be assymetric in its search.
2010/1/21 Gary - G4WGT <g4wgt@tiscali.co.uk= >
OK Andy,=20

Any suggestion is welcome but yes I do have it set for JT4A, I am cur= rently on 80m decoding fine with JT65A.

Looked at the Rate in & out in setup/options & are both set= for 1, the rate shown at the bottom left is usually very close to 1.0003.= I would say that is OK.

I will try again tomorrow.

Thanks again.

Gary - G4WGT.

2010/1/21 Andy Talbot <andy.g4jnt@go= oglemail.com>
may be egg-sucking-lecture, but you have got JT4A set haven't you= ?.=A0 Not B...G.
2010/1/21 Gary - G4WGT <g4wgt@tiscali.co.uk= >
Andy,=20

You wrote :-
Watch & check your sampling rate calibration. for this mode.

Is that displayed in the box at the bottom left, if so then it is alw= ays within the recommended figures. I read in the user guide to watch thos= e figures for stability & I have never seen it go outside the range sp= ecified in the manual.

There is an "Enable Diagnostics" in the setup menu but no= description in the use guide (WSJT6), it must be an addition in 7.03 but= not documented. Is that of any help to me?

73

Gary - G4WGT.


2010/1/21 Andy Talbot <andy.g4jnt@go= oglemail.com>=20

Watch & check your sampling rate calibration. for this mode.

Andy
www.g4jnt.com

This email has been scanned for damaging= side-effects by the health and safety police, is guaranteed to contain no= substances hazardous to health, but may contribute to dissolving the neth= er and polar regions


2010/1/21 Gary - G4WGT <g4wgt@tiscali.co.uk= >
LF,=20

Station calling about 503.670 kHz but no decode. Not sure why :-((

Gary - G4WGT.



2010/1/21 Gary - G4WGT <g4wgt@tiscali.co.uk= >
LF,=20

I am currently transmitting a WSJT JT4A test signal on 503.600 kHz at= each even minute, the ERP is estimated at 200 mW.

In a while I will change the message to a CQ call & watch for any= JT4A replies.

73,

Gary - G4WGT.










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