Return-Path: X-Spam-DCC: paranoid 1290; 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=-1.9 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_30_40,HTML_MESSAGE 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 t7MHIkfD019135 for ; Sat, 22 Aug 2015 19:18:46 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZTCOv-00074R-Pf for rs_out_1@blacksheep.org; Sat, 22 Aug 2015 18:16:17 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZTCOv-00074I-F4 for rsgb_lf_group@blacksheep.org; Sat, 22 Aug 2015 18:16:17 +0100 Received: from smtpcmd01231.aruba.it ([62.149.158.231]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZTCNq-00060P-C1 for rsgb_lf_group@blacksheep.org; Sat, 22 Aug 2015 18:16:16 +0100 Received: from PC-MAURO.stmb.it ([80.180.96.212]) by smtpcmd01.ad.aruba.it with bizsmtp id 7tEr1r00r4avs3U01tEsEr; Sat, 22 Aug 2015 19:14:53 +0200 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Sat, 22 Aug 2015 19:14:47 +0200 To: rsgb_lf_group@blacksheep.org, From: IK1WVQ Mauro In-Reply-To: <7E0C3B8C81574BB3B57589D478E1C624@White> References: <0LbuCq-1Z0UCd0iGK-00jKxe@mail.gmx.com> <55D718E5.8040508@posteo.de> <0FB4BC4D-1000-44F8-8855-C4B1B19CDDE8@talktalk.net> <4A6A0C74F3624CCC93FC660782555B89@PCFausto> <7E0C3B8C81574BB3B57589D478E1C624@White> Mime-Version: 1.0 X-Scan-Signature: fce77e88417377663dedf94f027ec622 Message-Id: Subject: Re: LF: Re: Band is open to VK! Content-Type: multipart/alternative; boundary="=====================_42646430==.ALT" 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: 3946 --=====================_42646430==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable the Marconi's trasmitter was a spark tx, with=20 many harmonics and no selective filters .. It possible what the transatlantic contact was=20 made using the 3=B0 or higher harmonic ??? 73 de Mauro IK1WVQ At 18:07 22/08/2015, Markus Vester wrote: >Hi Fausto, LF, > > >> do not forget that in 1901 Guglielmo Marconi=20 > received a signal across the Atlantic at a frequency around 500 kHz > >...did he really? I think there is some doubt=20 >around this story. With a coherer, it would be=20 >very hard to prove the difference between=20 >receiving a signal consisting of just three=20 >dots, and false triggering by random statics.=20 >Considering a situation where a success was=20 >badly needed, the reception may well have been the result of wishful= thinking. > >http://www.antiquewireless.org/= uploads/1/6/1/2/16129770/45-did_marconi_receive_transatlantic_radio_signals_= in_1901.pdf >http://www.antiquewireless.org/uploads/1/6/1/2/16129770/46-did_marconi_rece= ive_transatlantic_radio_signals_in_1901.pdf > >Today we'd simply say "show us the screenshot" ;-) > >Best 73, >Markus > > >From: Fausto Coletti >Sent: Friday, August 21, 2015 9:59 PM >To: rsgb_lf_group@blacksheep.org >Subject: Re: LF: Re: Band is open to VK! > >:-)) I have a 8 motor drone but can fly only 20 minutes with one Kg= payload. >A kite or baloon is better. >Seriously speaking, the difficulties are very=20 >big, as rightly says Stefan 160 meters band, has=20 >a very different behavior but, do not forget=20 >that in 1901 Guglielmo Marconi received a signal=20 >across the Atlantic at a frequency around 500=20 >kHz and with a receiver that in comparison with=20 >those of today was a tack. Ok were "only" 3500 Km. >Today what are we doing more with our ultramodern equipment? >Today we have SDR, filters, DSP, noise reducer,=20 >Marconi at Signal Hill had a drop of mercury. >Today obtain a considerable power is relatively easy and inexpensive, >114 years ago there were only Ruhmkorff coils=20 >then, how much power was actually radiated >no one ever taken the trouble to measure it. >But as they did then my compatriot to get those=20 >great results: trying, trying and trying again=20 >trying to improve something every day. >The important thing is to think that nothing is=20 >impossible, maybe improbable but not impossible. >Tonight I bored with the history of telegraphy...:-) > >73, Fausto IK4NMF >... --=====================_42646430==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
the Marconi's trasmitter was a spark tx, with many harmonics and no selective filters ..

It possible what the transatlantic contact was made using the 3=B0 or higher harmonic ???

73 de Mauro IK1WVQ


At 18:07 22/08/2015, Markus Vester wrote:
Hi Fausto, LF,
 
>> do not forget that in 1901 Guglielmo Marconi received a signal across the Atlantic at a frequency around 500 kHz
 
...did he really? I think there is some doubt around this story. With a coherer, it would be very hard to prove the difference between receiving a signal consisting of just three dots, and false triggering by random statics. Considering a situation where a success was badly needed, the reception may well have been the result of wishful thinking.
 
http://www.antiquewireless.org/uploads/1/6/1/2/16129770/45-did_marconi_recei= ve_transatlantic_radio_signals_in_1901.pdf
http://www.antiquewireless.org/uploads/1/6/1/2/16129770/46-did_marconi_recei= ve_transatlantic_radio_signals_in_1901.pdf
 
Today we'd simply say "show us the screenshot" ;-)
 
Best 73,
Markus
 

From: Fausto Coletti
Sent: Friday, August 21, 2015 9:59 PM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: Band is open to VK!

:-)) I have a 8 motor drone but can fly only 20 minutes with one Kg payload.
A kite or baloon is better.
Seriously speaking, the difficulties are very big, as rightly says Stefan 160 meters band, has a very different behavior but, do not forget that in 1901 Guglielmo Marconi received a signal across the Atlantic at a frequency around 500 kHz and with a receiver that in comparison with those of today was a tack. Ok were "only" 3500 Km.
Today what are we doing more with our ultramodern equipment?
Today we have SDR, filters, DSP, noise reducer, Marconi at Signal Hill had a drop of mercury.
Today obtain a considerable power is relatively easy and inexpensive,
114 years ago there were only Ruhmkorff coils then, how much power was actually radiated
no one ever taken the trouble to measure it.
But as they did then my compatriot to get those great results: trying, trying and trying again trying to improve something every day.
The important thing is to think that nothing is impossible, maybe improbable but not impossible.
Tonight I bored with the history of telegraphy...:-)
 
73, Fausto IK4NMF
...
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