Return-Path: X-Spam-DCC: paranoid 1102; 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=-0.3 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE,RATWARE_GECKO_BUILD 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 t13NR1vt011042 for ; Wed, 4 Feb 2015 00:27:01 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YImkn-0008G1-C0 for rs_out_1@blacksheep.org; Tue, 03 Feb 2015 23:19:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YImkm-0008Fs-Qs for rsgb_lf_group@blacksheep.org; Tue, 03 Feb 2015 23:19:32 +0000 Received: from mail-we0-f177.google.com ([74.125.82.177]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1YImkk-0000CG-II for rsgb_lf_group@blacksheep.org; Tue, 03 Feb 2015 23:19:31 +0000 Received: by mail-we0-f177.google.com with SMTP id l61so47756082wev.8 for ; Tue, 03 Feb 2015 15:19:29 -0800 (PST) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=aJwhh3eio9OLurlwmPsqPmkWFFGv54ESH2wAm98c6ZQ=; b=gMfwD3xTN16oRvLMnSpn6sPL4pDSu3rKG6gZq9tW5NmrpobTDk+3OcgzHQzRgHZOo0 dxhC2EhIh1O6P2i6slr2K/wdDxeiYl84AOCvzgC7J6uJCL6xJIkq9PwbwcmJOJWJ1tyw a99b+8lDqcf1gqozcWHjG/0HQxKkq/ZMFsr4vID3Y6XPiq3UV0NdKeAL8mS17yhFjp1J EkQlVzw4uQ4wqLwCgPW13QVbLKI914DDdYhHwkouziK4zaFTsITE7OsLSkeTtwJeJOjl /l9fEPZa4yzt4//JomndDseBw3dFW6keVMfkpdOaPKCZvE1wtAQgXORCQWysjwBG462D SG+A== X-Received: by 10.194.63.16 with SMTP id c16mr59944764wjs.117.1423005569662; Tue, 03 Feb 2015 15:19:29 -0800 (PST) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id vh8sm13064wjc.12.2015.02.03.15.19.28 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 03 Feb 2015 15:19:28 -0800 (PST) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <54D1577F.2060902@gmail.com> Date: Wed, 04 Feb 2015 00:19:27 +0100 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: <5E5CE58E519E4555A1A38CCC37F8AA17@malHP> <54CBC354.9010604@gmail.com> <54D14FA1.8000003@gmail.com> <6B8E3E85EAD84D18B2B914F3AFC2CFB0@White> In-Reply-To: <6B8E3E85EAD84D18B2B914F3AFC2CFB0@White> X-Scan-Signature: c2d3004053ffd6a8f3b98d2033b61db9 Subject: Re: LF: MF WSPR remote RX experiments Content-Type: multipart/alternative; boundary="------------030905070004050505000900" 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 2230 This is a multi-part message in MIME format. --------------030905070004050505000900 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Markus, It is still a test on the same antenna like the normal MF grabber. Yesterday i have been in the garden, trying to get a connection with the raspi. BTW this system is consuming 220 mA at 12V now. Got no internet access. Connected the netbook, found the link, connected (5 of 5 bars SNR) but "The DNS server does not answer"... Will solve that soon. But it was a sunny day and fun to climb into the tree after a few months. See this image: https://dl.dropboxusercontent.com/u/19882028/MF/20150202_153957.jpg Yes the hard test will be in the afternoon :-) Hopefully i can check this very soon. And i like to run the system for a few days... 73, Stefan Am 04.02.2015 00:07, schrieb Markus Vester: > Hi Stefan, > interesting, great experiment! > I've placed your two MF grabbers side by side. Actually except for the > different scroll rates, the two spectrograms look surprisingly > similar. Even some of the interference seems to be common to both (eg. > the unstable line on 475.35 kHz) - I would have thought this is a > local one from your building but apparently not so. > Background noise level also seems to be similar now. But if there is > an improvemant it may show up more dramatically in the daytime when > the external noise floor should be much lower. > Best of luck, > Markus > > *From:* DK7FC > *Sent:* Tuesday, February 03, 2015 11:45 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: MF WSPR remote RX experiments > > Hi MF, > > I have improved my new /p receiver for MF. > > Also Wolf followed a suggestion for SpecLab and released an updated > version, many thanks for the service! The suggestion was to add a button > to automatically restart the connection to a web stream. > > This function is important for my Raspberry VLF/LF/MF link, in case the > is a short loss of the connection. Re-connecting works very well and so, > the "near end" of the system, i.e. the link: data-stream -> > Spectrogram/grabber/tone/VAC/WSPR et. al. is complete! > > So, SpecLab reads the stream, generates Spectrograms, CW tone, WSPR > passband inclusive frequency conversion to 1500 Hz "dial", jpgs and > uploads to the web server, all i need :-) > I set up a new experimental grabber at > http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html, > now showing the received data stream of MF. > > I'm excited by the rx performance now (homemade DC). The dynamic range > is 100 dB and the band noise at -80 dB f.s., i.e. 80 dB range. Maybe > this even allows to transmit without overloading the RX if it is in 2.4 > km distance? > > Just some thoughts for the moment ;-) > > 73, Stefan/DK7FC > > > Am 30.01.2015 18:45, schrieb DK7FC: > > Hello MF, > > > > I've continued with tests for my remote RX station. > > > > Right now i am running a Raspberry pi on a 7 Ah battery. It drives a > > WLAN stick and a simple USB sound card, feeding audio via a vorbis > > steam through the web. A MF receiver (LO = 461 kHz) is running on the > > same battery. The RX is connected to the same antenna where my MF/LF > > grabber is connected to. Ah and the Raspberry pi is powered by an > > external switch mode regulator, 12V=>5V! All in all this consumes > > about 250 mA @ 12V. > > > > I am playing the vorbis audio stream (about 220 kbps) directly in > > SpecLab where i can see the full MF spectrum. SpecLab is running a 2.5 > > kHz wide band filter and frequency converter feeding a virtual audio > > cable. Finally this is connected to WSPR-X... Now i can compare the > > SNR difference on both, the grabber RX and the remote-RX plus web > > data stream. The receivers are technically nearly identical as well as > > the filter settings. > > > > There is some time delay but it is not problematic, no correction > > needed for WSPR. I'm getting quite good results from the first > > attempt, a SNR difference less than +- 1 dB. > > > > The remote system is not running in the garden now, just a local test. > > > > WSPR reports on MF via web streaming are coming in at DK7FC/RPI. > > > > The test is running for a few hours now :-) > > > > 73, Stefan/DK7FC > > > --------------030905070004050505000900 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Markus,

It is still a test on the same antenna like the normal MF grabber. Yesterday i have been in the garden, trying to get a connection with the raspi. BTW this system is consuming 220 mA at 12V now. Got no internet access. Connected the netbook, found the link, connected (5 of 5 bars SNR) but "The DNS server does not answer"... Will solve that soon. But it was a sunny day and fun to climb into the tree after a few months. See this image: https://dl.dropboxusercontent.com/u/19882028/MF/20150202_153957.jpg

Yes the hard test will be in the afternoon :-) Hopefully i can check this very soon. And i like to run the system for a few days...

73, Stefan

Am 04.02.2015 00:07, schrieb Markus Vester:
Hi Stefan,
 
interesting, great experiment!
 
I've placed your two MF grabbers side by side. Actually except for the different scroll rates, the two spectrograms look surprisingly similar. Even some of the interference seems to be common to both (eg. the unstable line on 475.35 kHz) - I would have thought this is a local one from your building but apparently not so.
 
Background noise level also seems to be similar now. But if there is an improvemant it may show up more dramatically in the daytime when the external noise floor should be much lower.
 
Best of luck,
Markus 

From: DK7FC
Sent: Tuesday, February 03, 2015 11:45 PM
Subject: Re: LF: MF WSPR remote RX experiments

Hi MF,

I have improved my new /p receiver for MF.

Also Wolf followed a suggestion for SpecLab and released an updated
version, many thanks for the service! The suggestion was to add a button
to automatically restart the connection to a web stream.

This function is important for my Raspberry VLF/LF/MF link, in case the
is a short loss of the connection. Re-connecting works very well and so,
the "near end" of the system, i.e. the link: data-stream ->
Spectrogram/grabber/tone/VAC/WSPR et. al. is complete!

So, SpecLab reads the stream, generates Spectrograms, CW tone, WSPR
passband inclusive frequency conversion to 1500 Hz "dial", jpgs and
uploads to the web server, all i need :-)
I set up a new experimental grabber at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html,
now showing the received data stream of MF.

I'm excited by the rx performance now (homemade DC). The dynamic range
is 100 dB and the band noise at -80 dB f.s., i.e. 80 dB range. Maybe
this even allows to transmit without overloading the RX if it is in 2.4
km distance?

Just some thoughts for the moment ;-)

73, Stefan/DK7FC


Am 30.01.2015 18:45, schrieb DK7FC:
> Hello MF,
>
> I've continued with tests for my remote RX station.
>
> Right now i am running a Raspberry pi on a 7 Ah battery. It drives a
> WLAN stick and a simple USB sound card, feeding audio via a vorbis
> steam through the web. A MF receiver (LO = 461 kHz) is running on the
> same battery. The RX is connected to the same antenna where my MF/LF
> grabber is connected to. Ah and the Raspberry pi is powered by an
> external switch mode regulator, 12V=>5V! All in all this consumes
> about 250 mA @ 12V.
>
> I am playing the vorbis audio stream (about 220 kbps) directly in
> SpecLab where i can see the full MF spectrum. SpecLab is running a 2.5
> kHz wide band filter and frequency converter feeding a virtual audio
> cable. Finally this is connected to WSPR-X... Now i can compare the
> SNR difference on both, the grabber RX and the remote-RX  plus web
> data stream. The receivers are technically nearly identical as well as
> the filter settings.
>
> There is some time delay but it is not problematic, no correction
> needed for WSPR. I'm getting quite good results from the first
> attempt, a SNR difference less than +- 1 dB.
>
> The remote system is not running in the garden now, just a local test.
>
> WSPR reports on MF via web streaming are coming in at DK7FC/RPI.
>
> The test is running for a few hours now :-)
>
> 73, Stefan/DK7FC
>

--------------030905070004050505000900--