Return-Path: X-Spam-DCC: paranoid 1480; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u9CEe4wS022412 for ; Wed, 12 Oct 2016 16:40:05 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1buKeF-0005Cp-3X for rs_out_1@blacksheep.org; Wed, 12 Oct 2016 15:36:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1buKeE-0005Cg-L8 for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2016 15:36:46 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1buKeD-0007u8-4U for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2016 15:36:45 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 4AAD320833 for ; Wed, 12 Oct 2016 16:36:42 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3svGdk0t6Tz106P for ; Wed, 12 Oct 2016 16:36:42 +0200 (CEST) Message-ID: <57FE4A79.2010904@posteo.de> Date: Wed, 12 Oct 2016 16:36:41 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <157b05f2e7d-a71-85cc@webprd-a60.mail.aol.com> <57FC02C5.10700@posteo.de> <57FCA0EC.3000804@abelian.org> <57FCE651.7020809@posteo.de> <57FE04F2.9090208@abelian.org> In-Reply-To: <57FE04F2.9090208@abelian.org> X-Scan-Signature: b42857a5fad6e32377447282c21f62b1 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz Content-Type: multipart/alternative; boundary="------------030709070707040802050000" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Length: 4430 Status: O X-Status: X-Keywords: X-UID: 9041 This is a multi-part message in MIME format. --------------030709070707040802050000 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Paul, Thanks. That's an interesting result of our tests. I didn't expect such a difference between day and night. Could it have to do with our specific distance, or, could the observation be completely different in a location beeing 200 km farer away? In June, the signal was clearly shown on Renato Romeros grabber, now there is no trace! Odd. No more results on the last two attempts on 6470? OK, let's try that. 15 chars on 6470 Hz in 12 hours, that sounds very optimistic to me. I will prepare the system and announce: *f = 6470.00000 Hz Start time: 13.10.2016 06:00:00 UTC Symbol length: 20 s Characters: 15 CRC 16 Coding 16K25A Duration: 11h, 33m, 20s* *Antenna current: 290 mA (ish)* 73, Stefan PS: Just to try something easy again i started a short transmission that i can decode for myselfe (from the tree), to check the system is running well: *f = 6470.00000 Hz Start time: 12.10.2016 14:30:00 UTC Symbol length: 40 s Characters: 3 CRC 16 Coding 8K19A Duration: 4h, 37m, 20s* *Antenna current: 290 mA (ish)* Can you deocde the message as well? It is mainly in the time slot you suggested and 3 characters in the same symbol length should work well then. Am 12.10.2016 11:40, schrieb Paul Nicholson: > > Using the carrier on 6470.0025, I can see that the signal is > completely lost in the noise during the night. > > Daytime S/N 06:00 to 18:00 UT is 21dB in 23uHz, which is > sufficient for, say, 15 chars with 20 second symbols using > 16K25 for estimate Eb/N0 of +0.5 dB, duration 11:33:20. > > Daytime signal averages about 0.05 fT or 15nV (about two > electrons on a 20pF antenna), nighttime looks similar as > far as I can tell through the noise. > > We should try a daytime test. > -- > Paul Nicholson > -- > --------------030709070707040802050000 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Paul,

Thanks. That's an interesting result of our tests. I didn't expect such a difference between day and night. Could it have to do with our specific distance, or, could the observation be completely different in a location beeing 200 km farer away?
In June, the signal was clearly shown on Renato Romeros grabber, now there is no trace! Odd.

No more results on the last two attempts on 6470?

OK, let's try that. 15 chars on 6470 Hz in 12 hours, that sounds very optimistic to me. I will prepare the system and announce:

f = 6470.00000 Hz
Start time: 13.10.2016   06:00:00 UTC
Symbol length: 20 s
Characters: 15
CRC 16
Coding 16K25A
Duration: 11h, 33m, 20s
Antenna current: 290 mA (ish)

73, Stefan

PS: Just to try something easy again i started a short transmission that i can decode for myselfe (from the tree), to check the system is running well:


f = 6470.00000 Hz
Start time: 12.10.2016   14:30:00 UTC
Symbol length: 40 s
Characters: 3
CRC 16
Coding 8K19A
Duration: 4h, 37m, 20s
Antenna current: 290 mA (ish)

Can you deocde the message as well? It is mainly in the time slot you suggested and 3 characters in the same symbol length should work well then.






Am 12.10.2016 11:40, schrieb Paul Nicholson:

Using the carrier on 6470.0025, I can see that the signal is
completely lost in the noise during the night.

Daytime S/N 06:00 to 18:00 UT is 21dB in 23uHz, which is
sufficient for, say, 15 chars with 20 second symbols using
16K25 for estimate Eb/N0 of +0.5 dB, duration 11:33:20.

Daytime signal averages about 0.05 fT or 15nV (about two
electrons on a 20pF antenna), nighttime looks similar as
far as I can tell through the noise.

We should try a daytime test.
--
Paul Nicholson
--

--------------030709070707040802050000--