Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: * X-Spam-Status: No, score=1.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,RCVD_IN_SORBS_WEB,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; 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 v58BEsu3012755 for ; Thu, 8 Jun 2017 13:14:55 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dIvKS-0007Lo-Un for rs_out_1@blacksheep.org; Thu, 08 Jun 2017 12:10:16 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dIvKS-0007Lf-9B for rsgb_lf_group@blacksheep.org; Thu, 08 Jun 2017 12:10:16 +0100 Received: from gmy2-mh862.smtproutes.com ([94.186.192.191]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1dIvKJ-0008Vr-Ub for rsgb_lf_group@blacksheep.org; Thu, 08 Jun 2017 12:10:15 +0100 X-Katharion-ID: 1496920189.45950.gmy2-mh862 Received: from servigilant.vigilant.es ([85.60.35.36]) by gmy2-mh862.smtproutes.com [(94.186.192.191)] with ESMTP via TCP (TLSv1/TLS_DHE_RSA_WITH_AES_256_CBC_SHA); 08 Jun 2017 11:09:49 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Thu, 8 Jun 2017 13:09:48 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: VLF CW transmision from Speleo amateurs in Spain Thread-Index: AdLgQXC7VOWcsQ+aRXuvDUDXT1KKug== Date: Thu, 8 Jun 2017 11:09:48 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB8FEFBFEB@servigilant.vigilant.local> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [fe80::bc02:478c:b94e:49df] MIME-Version: 1.0 X-Scan-Signature: 3a21c85df7468d917c96c4564305897b Subject: LF: VLF CW transmision from Speleo amateurs in Spain Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB8FEFBFEBservigilantvigi_" 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: RO X-Status: A X-Keywords: X-UID: 11933 --_000_579355A36AEE9D4FA555C45D556003AB8FEFBFEBservigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi VLF ..... a bit off topic but seems that this is the right place to talk= about "almost DC" radio experiments, isn't it ? ;-) Got news from Juan Leandro. Not a radio amateur (yet) but strong enthusiast= and technician who has developed a series of electronic aids to perform communications from speleo amateurs = inside caves with the team outside The system was initially designed to provide a signal reference to measure = angles from surface and then use this data to make 3D charts of the caves. But the last version, called SUMMER can als= o be used to transmit CW to the surface It uses a magnetic antenna at 38.4KHz The last operation took place last weekend june 4th inside a siphon which i= ncluded diving. SUMMER was used to inform surface team and keep them aware about the development of the activity. It = was a distance of 70,5m trought rock package The design of the SUMMER is tailored to speleo needs, not radio amateurs. T= he operator terminal is a ruggerized Android phone running "Morse Player" and sending the keying to SUMMER via Bluetooth= . All IP66 proved and very rugged ;-) At surface, a regenerative Rx and two decoders were used. One Android with = App "Morse reader" and MultiPSK in a laptop This links to the website of the group. Sorry, Spanish only but you can see= a lot of pictures here http://extopocien.es/galeria-de-fotos There is also an audio of the CW signal here. OOO copy indeed :) https://drive.google.com/file/d/0B35G5k4xUp5VeFUwXzFaN1pkNkE/view And a video showing the surface operation https://drive.google.com/file/d/0B35G5k4xUp5Vck9LMEpEemRISnM/view You will probably find interesting the description of the SUMMER transmitte= r, which is in few pdf docs at this links https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201= %20descripcion.pdf https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201= %20Tcontrol.pdf https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201= esq.pdf https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Emisor%20s= ummer1descRecA.pdf A lot of room for improvement, but keep in mind that this guys are not look= ing for squeezing the last dB but making a realiable and easy to operate system. They can not deal with v= ery slow modes and all must be kept reasonably simple, which most of the times means also, reliable. Cave explo= rers are not DX operators ;-) Comments and advices are thruly wellcome. Juan Leandro is one of the (many)= readers of this reflector 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB8FEFBFEBservigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi VLF ….. a bit off topi= c but seems that this is the right place to talk about “almost DCR= 21; radio experiments, isn’t it ?  ;-)

 

Got news from Juan Leandro. Not= a radio amateur (yet) but strong enthusiast and technician who has develop= ed

a series of electronic aids to = perform communications from speleo amateurs inside caves with the team outs= ide

The system was initially design= ed to provide a signal reference to measure angles from surface and then us= e this data

to make 3D charts of the caves.= But the last version, called SUMMER can also be used to transmit CW to the= surface

It uses a magnetic antenna at 3= 8.4KHz

 

The last operation took place l= ast weekend june 4th inside a siphon which included diving. SUMM= ER was used to inform

surface team and keep them awar= e about the development of the activity. It was a distance of 70,5m trought= rock package

The design of the SUMMER is tai= lored to speleo needs, not radio amateurs. The operator terminal is a rugge= rized Android

phone running “Morse Play= er” and sending the keying to SUMMER via Bluetooth. All IP66 proved a= nd very rugged  ;-)

 

At surface, a regenerative Rx a= nd two decoders were used. One Android with App “Morse reader” = and MultiPSK in a laptop

 

This links to the website of th= e group. Sorry, Spanish only but you can see a lot of pictures here

http://extopocien.es/galeria-de-fotos

 

There is also an audio of the C= W signal here. OOO copy indeed J

https://drive.google.com/fil= e/d/0B35G5k4xUp5VeFUwXzFaN1pkNkE/view

 

And a video showing the surface= operation

https://drive.google.com/fil= e/d/0B35G5k4xUp5Vck9LMEpEemRISnM/view

 

You will probably find interest= ing the description of the SUMMER transmitter, which is in few pdf docs at = this links

= https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201= %20descripcion.pdf

htt= ps://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201%20= Tcontrol.pdf

https://dl.= dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Summer%201esq.pdf=

= https://dl.dropboxusercontent.com/u/7162072/Docs/Espeleo%20gonio/Emisor%20s= ummer1descRecA.pdf

 

A lot of room for improvement, = but keep in mind that this guys are not looking for squeezing the last dB

but making a realiable and easy= to operate system. They can not deal with very slow modes and all must be = kept

reasonably simple, which most o= f the times means also, reliable. Cave explorers are not DX operators  = ;;-)

 

Comments and advices are thruly= wellcome. Juan Leandro is one of the (many) readers of this reflector=

 

73 de Luis

EA5DOM

 

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