Return-Path: Received: from mtain-db04.r1000.mx.aol.com (mtain-db04.r1000.mx.aol.com [172.29.64.88]) by air-mf05.mail.aol.com (v126.13) with ESMTP id MAILINMF051-8be94b60b33c1ab; Wed, 27 Jan 2010 16:42:20 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4906138000472; Wed, 27 Jan 2010 16:42:18 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NaFdM-0005i7-A3 for rs_out_1@blacksheep.org; Wed, 27 Jan 2010 21:41:08 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NaFdL-0005hy-Ph for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 21:41:07 +0000 Received: from cavuit01.kulnet.kuleuven.be ([134.58.240.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NaFdJ-00075h-6m for rsgb_lf_group@blacksheep.org; Wed, 27 Jan 2010 21:41:07 +0000 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id ED7DE7B8047 for ; Wed, 27 Jan 2010 22:40:53 +0100 (CET) Received: from ICTS-S-HUB-N1.luna.kuleuven.be (icts-s-hub-n1.luna.kuleuven.be [10.112.9.11]) by smtps01.kuleuven.be (Postfix) with ESMTP id C737331E702 for ; Wed, 27 Jan 2010 22:40:53 +0100 (CET) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N1.luna.kuleuven.be ([10.112.9.11]) with mapi; Wed, 27 Jan 2010 22:40:53 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Wed, 27 Jan 2010 22:40:52 +0100 Thread-Topic: LF: RE: 500 kHz JT4A Thread-Index: AcqflIuIvBkxAkfHRLq7jQJb6CCBwAAA/BOA Message-ID: References: <1f0624b91001271133g22391461tfa8dc9a87c8f14d4@mail.gmail.com> ,<1f0624b91001271303v1eb7094bp659dba8418585e81@mail.gmail.com> In-Reply-To: <1f0624b91001271303v1eb7094bp659dba8418585e81@mail.gmail.com> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: RE: LF: RE: 500 kHz JT4A Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C1284D4B32BICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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: 3039ac1d40584b60b33a65d9 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C1284D4B32BICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gary, the SNR values over the last hour or so varied between -2 and -13dB. Assuming a -24dB limit and your current power (50W) anything above 5W woul= d provide solid copy and 0.5W occasional copy. Impressive. I should get QRV on JT4A, but I blew the transformer of my "straight" 100W= PA, and my 250W G3YXM-clone PA needs 1MHz drive (at TTL level), so I cann= ot use that with my HF/500kHz transverter. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Gary - G4WGT [g4wgt@tiscali.co.uk] Verzonden: woensdag 27 januari 2010 22:03 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: RE: 500 kHz JT4A Rik, & Andy, Thanks for your report & comments & Andy for answering Rik's query. Well there has not been any response to my CQ call so I will change the te= xt to beacon & continue to see if there is a report from further afield. If you want to try for a weak decode I can reduce the power for a short pe= riod say 30 minutes, my power is 50 watt RF (200 mW ERP) at the moment so= in view of your good report I could take it down to 10 watts RF. Let me know. 73, Gary - G4WGT - IO83qo 2010/1/27 Andy Talbot > -24dB S/N (2.5kHz ) is usually guaranteed Andy www.g4jnt.com This email has been scanned for damaging side-effects by the health and sa= fety police, is guaranteed to contain no substances hazardous to health,= but may contribute to dissolving the nether and polar regions 2010/1/27 Rik Strobbe > Gary, solid copy here, SNR -5 to -7dB. But the signal is clearly audible, CW would be armchair copy. Any idea down to what SNR values JT4A produces a usable decoding ? 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Gary - G4WGT [g4wgt@tiscali.co.uk] Verzonden: woensdag 27 januari 2010 20:33 Aan: Rsgb_Lf_Group Onderwerp: LF: 500 kHz JT4A LF, Running JT4A this evening on 503.600 kHz, dial frequency 502.300 kHz USB. 73, Gary - G4WGT - IO83qo --_000_BF4A524700075746A6467658DFC7102C1284D4B32BICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Gary,<= /font>
 
the SNR values over the= last hour or so varied between -2 and -13dB.
Assuming a -24dB limit= and your current power (50W) anything above 5W would provide solid copy= and 0.5W occasional copy.
Impressive.
I should get QRV on= JT4A, but I blew the transformer of my "straight" 100W PA, = ;and my 250W G3YXM-clone PA needs 1MHz drive (at TTL level), so I cannot= use that with my HF/500kHz transverter.
 
73, Rik  ON7YD - OR= 7T
Van: owner-rsgb_lf_group@blackshee= p.org [owner-rsgb_lf_group@blacksheep.org] namens Gary - G4WGT [g4wgt@tisc= ali.co.uk]
Verzonden: woensdag 27 januari 2010 22:03
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: RE: 500 kHz JT4A

Rik, & Andy,

Thanks for your report & comments & Andy for answering Rik's= query.

Well there has not been any response to my CQ call so I will change= the text to beacon & continue to see if there is a report from furthe= r afield.

If you want to try for a weak decode I can reduce the power for a sho= rt period say 30 minutes, my power is 50 watt RF (200 mW ERP) at the momen= t so in view of your good report I could take it down to 10 watts RF.

Let me know.

73, Gary - G4WGT - IO83qo

2010/1/27 Andy Talbot <andy.g4jnt@googlemail.com&g= t;
-24dB S/N (2.5kHz )  is usually guaranteed

Andy
www.g4jnt.com

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


2010/1/27 Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>

Gary,<= /font>
 
solid copy here, SNR -5= to -7dB.
But the signal is clearl= y audible, CW would be armchair copy.
Any idea down to what SN= R values JT4A produces a usable decoding ?
 
73, Rik  ON7YD - OR= 7T
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Gary -= G4WGT [g4wgt@tiscali.co.uk] Verzonden: woensdag 27 januari 2010 20:33
Aan: Rsgb_Lf_Group
Onderwerp: LF: 500 kHz JT4A

LF,

Running JT4A this evening on 503.600 kHz, dial frequency 502.300 kHz= USB.

73, Gary - G4WGT - IO83qo


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