Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v42LWUlg008149 for ; Tue, 2 May 2017 23:32:31 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d5fLd-0005H5-0w for rs_out_1@blacksheep.org; Tue, 02 May 2017 22:28:41 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d5fKp-0005Gs-0i for rsgb_lf_group@blacksheep.org; Tue, 02 May 2017 22:27:51 +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 4.89) (envelope-from ) id 1d5fKl-0000xw-NT for rsgb_lf_group@blacksheep.org; Tue, 02 May 2017 22:27:49 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 738CC20D53 for ; Tue, 2 May 2017 23:27:46 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3wHZBn68BkzytZ for ; Tue, 2 May 2017 23:27:45 +0200 (CEST) Message-ID: <5908F9D1.7030403@posteo.de> Date: Tue, 02 May 2017 23:27:45 +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: <579355A36AEE9D4FA555C45D556003AB8FDD6283@servigilant.vigilant.local>,<590881D8.6070202@posteo.de> <579355A36AEE9D4FA555C45D556003AB8FDD667C@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB8FDD667C@servigilant.vigilant.local> X-Scan-Signature: 2bd5d3c3e4b1ac0d4c95b192e62a82a2 Subject: Re: LF: SL settings for EbNaut FFT recording ? Content-Type: multipart/alternative; boundary="------------060303010401020201030408" 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 2.75 Status: O X-Status: X-Keywords: X-UID: 11564 This is a multi-part message in MIME format. --------------060303010401020201030408 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Luis, Am 02.05.2017 22:51, schrieb VIGILANT Luis Fernández: > The grabber is now showing full spectrum from 0-24KHz > https://ea5dom.ure.es/grabber/index.html OK. There is still some room for improvements :-) > > The Rx is not at Benidorm in the high tower. It is in the roof of a > two level house on top of a 5m pole > But clear out from high obstacles and trees On top of a 5m pole is very good. But the location or earth is very contaminated. > The pole is a 50cm x 10mm diameter aluminium rod. Will play with the > 10MOhm resistor and first fet stage > with filter. I think this is not necessary now. Better to try to find a cleaner ground and/or location, as you say. > The noise at MiniWhip rised 20dB, so must get it > appart to keep the ear at MF/LF. Yes, LF and MF stays important too! :-) > The power supply is a 12V transformer shared with the MiniWhip Maybe this causes a ground loop which picks up the hum. Could explain why LF/MF became worse as well. > Will test another one just for the VLF probe and with better filtering. Or try a battery in a first step and see the difference. A separate small transformer supply is certainly a good decision. > The GND of the antenna is separated > from mains earth and there is an audio transformer to the PC soundcard FB. > BTW. What I'm getting from SL is one FFT file 112Kb size every hour as > Markus said > But how can I merge all the files of a 8h transmission like the one > your are running now ? Each file covers 8.9 hours. They are just overlapping so that you can select the closest one (lowest start time offset). I don't know the exact settings though. I would recommend to set the FFT center frequency to 8270.1 Hz. > > Your signal in your grabber looks stronger than the previous transmissions It is the same antenna current though. 73, Stefan --------------060303010401020201030408 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Luis,

Am 02.05.2017 22:51, schrieb VIGILANT Luis Fernández:
The grabber is now showing full spectrum from 0-24KHz
OK. There is still some room for improvements :-)

The Rx is not at Benidorm in the high tower. It is in the roof of a two level house on top of a 5m pole
But clear out from high obstacles and trees
On top of a 5m pole is very good. But the location or earth is very contaminated.
The pole is a 50cm x 10mm diameter aluminium rod. Will play with the 10MOhm resistor and first fet stage
with filter.
I think this is not necessary now. Better to try to find a cleaner ground and/or location, as you say.
The noise at MiniWhip rised 20dB, so must get it
appart to keep the ear at MF/LF.
Yes, LF and MF stays important too! :-)
The power supply is a 12V transformer shared with the MiniWhip
Maybe this causes a ground loop which picks up the hum. Could explain why LF/MF became worse as well.
Will test another one just for the VLF probe and with better filtering.
Or try a battery in a first step and see the difference. A separate small transformer supply is certainly a good decision.
The GND of the antenna is separated
from mains earth and there is an audio transformer to the PC soundcard
FB.
BTW. What I'm getting from SL is one FFT file 112Kb size every hour as Markus said
But how can I merge all the files of a 8h transmission like the one your are running now ?
Each file covers 8.9 hours. They are just overlapping so that you can select the closest one (lowest start time offset). I don't know the exact settings though. I would recommend to set the FFT center frequency to 8270.1 Hz.

Your signal in your grabber looks stronger than the previous transmissions
It is the same antenna current though.

73, Stefan
--------------060303010401020201030408--