Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,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 u3AMeF37004663 for ; Mon, 11 Apr 2016 00:40:15 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1apNx6-0001FF-8B for rs_out_1@blacksheep.org; Sun, 10 Apr 2016 23:35:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1apNx5-0001F6-F9 for rsgb_lf_group@blacksheep.org; Sun, 10 Apr 2016 23:35:31 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1apNx2-0004dE-RO for rsgb_lf_group@blacksheep.org; Sun, 10 Apr 2016 23:35:30 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 0723B209B9 for ; Mon, 11 Apr 2016 00:35:27 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3qjp1V6hvLz5vN3 for ; Mon, 11 Apr 2016 00:35:26 +0200 (CEST) Message-ID: <570AD52E.7000104@posteo.de> Date: Mon, 11 Apr 2016 00:35:26 +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: <7d93313dd7b845b7b525c2071b83c5d1@kabelmail.de> In-Reply-To: <7d93313dd7b845b7b525c2071b83c5d1@kabelmail.de> X-Scan-Signature: 567a11ac6cfe1e88f3054745c06178fe Subject: LF: VLF remote stream with GPS locking Content-Type: multipart/alternative; boundary="------------050609000005020905050604" 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 Status: O X-Status: X-Keywords: X-UID: 7644 This is a multi-part message in MIME format. --------------050609000005020905050604 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi VLF, I've now configured and installed a 10 EUR cheap NEO-6M GPS module on the tree. It consumes about 45 mA at 3.3V, i.e. abt 0.15W. This can be accepted and i can switch it off remotely if not needed. The module feeds 1 pps + NMEA into the right soundcard channel of my stereo soundcard (one of two) which is running on the Raspi Pi 2B. Some images: https://www.dropbox.com/sh/sge3dbp4yp7du5s/AACRxEHRQQiODt0fb2y8E8-Ya?dl=0 The sound data is streamed to the PC(s) in the shack where the 1 pps to NMEA is read by SpecLab to compensate the soundcard drift and eventual phase glitches. The Alpha trace at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html has no glitches any more, except the original one at 21UTC. However there seems to be some phase jitter. Unfortunately the config data of the module was not saved but i assume that in unintentionally short cut the backup battery while carrying the module to the tree in a plastic bag containing other electronic parts. Now the NMEA data collidates with 1 pps (again). I will soon re-configure the module and hope the jitter is gone then. Does someone ever played with SpecLab and NMEA and know the jitter effect and its reasons? But, now i'm running a 47 uHz, 'DFCW-60000' instance and another one generating txt files for an eventual decode of DJ8WX' VLF EbNaut transmission tomorrow morning. The VLF RX loop is pointing into his direction! Ah, yes, and, there is some QRM in the wideband spectrum during sunny afternoons. This is my solar charger which was still re-designed to regulate (clipping) the voltage depending on the temperature. The VLF loop is just in 3m distance to that regulator and cables. I will further improve... Now let's hope for Uwe :-) 73, Stefan Am 10.04.2016 22:30, schrieb uwe-jannsen@kabelmail.de: > > the carrier is on the air. > the message: > > start 2016-04-11 07:00:00 > > coding 8K19A > > CRC 16 > > period 30 > > length 3 > > duration 03:28:00:00 > > Have fun > Uwe/dj8wx > --------------050609000005020905050604 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi VLF,

I've now configured and installed a 10 EUR cheap NEO-6M GPS module on the tree. It consumes about 45 mA at 3.3V, i.e. abt 0.15W. This can be accepted and i can switch it off remotely if not needed. The module feeds 1 pps + NMEA into the right soundcard channel of my stereo soundcard (one of two) which is running on the Raspi Pi 2B. Some images: https://www.dropbox.com/sh/sge3dbp4yp7du5s/AACRxEHRQQiODt0fb2y8E8-Ya?dl=0
The sound data is streamed to the PC(s) in the shack where the 1 pps to NMEA is read by SpecLab to compensate the soundcard drift and eventual phase glitches.
The Alpha trace at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html has no glitches any more, except the original one at 21UTC.

However there seems to be some phase jitter. Unfortunately the config data of the module was not saved but i assume that in unintentionally short cut the backup battery while carrying the module to the tree in a plastic bag containing other electronic parts. Now the NMEA data collidates with 1 pps (again). I will soon re-configure the module and hope the jitter is gone then.
Does someone ever played with SpecLab and NMEA and know the jitter effect and its reasons?

But, now i'm running a 47 uHz, 'DFCW-60000' instance and another one generating txt files for an eventual decode of DJ8WX' VLF EbNaut transmission tomorrow morning. The VLF RX loop is pointing into his direction!

Ah, yes, and, there is some QRM in the wideband spectrum during sunny afternoons. This is my solar charger which was still re-designed to regulate (clipping) the voltage depending on the temperature. The VLF loop is just in 3m distance to that regulator and cables. I will further improve...

Now let's hope for Uwe :-)

73, Stefan


Am 10.04.2016 22:30, schrieb uwe-jannsen@kabelmail.de:

the carrier is on the air.
the message:

start 2016-04-11 07:00:00

coding 8K19A

CRC 16

period 30

length 3

duration 03:28:00:00

Have fun
Uwe/dj8wx

--------------050609000005020905050604--