Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 065E8380000EE; Thu, 25 Oct 2012 14:08:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TRRpx-0007Zq-Kg for rs_out_1@blacksheep.org; Thu, 25 Oct 2012 19:07:21 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TRRpx-0007Zh-4m for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 19:07:21 +0100 Received: from smtpout2.wanadoo.co.uk ([80.12.242.42] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TRRpv-0007g3-B0 for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 19:07:20 +0100 Received: from AGB ([2.26.16.105]) by mwinf5d28 with ME id FW7H1k00V2G0UbE03W7HWw; Thu, 25 Oct 2012 20:07:18 +0200 Message-ID: From: "Graham" To: References: <4084B089A7FF496CAC1CE9A2459B9C47@AGB> <7E9EB5FA653147298EEBB4676DCDD9DD@White> <3DD7F0DC19984F7CBF611D59430EEFA3@AGB> <508912A0.5060902@iup.uni-heidelberg.de> <648CE70A981F42D9BD696ECDCE4CBF96@AGB> <1351185351.1901.YahooMailNeo@web133206.mail.ir2.yahoo.com> In-Reply-To: <1351185351.1901.YahooMailNeo@web133206.mail.ir2.yahoo.com> Date: Thu, 25 Oct 2012 19:07:17 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Ah yes , but those are not liner ? , cannot modulate a laser , only on/off serial ? G. From: M0FMT Sent: Thursday, October 25, 2012 6:15 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.42 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 081739af09bdcbecda01e4d970c01b31 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) Content-Type: multipart/alternative; boundary="----=_NextPart_000_007A_01CDB2E3.F36D7690" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d404e508980164140 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_007A_01CDB2E3.F36D7690 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ah yes , but those are not liner ? , cannot modulate a laser , = only on/off serial ? =20 G.=20 From: M0FMT=20 Sent: Thursday, October 25, 2012 6:15 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 = KHz :) Hi All You need erbium doped glass amplifiers like we used on long distance = fibre networks. 73 es GL Pete M0FMT IO91UX From: Graham To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, 25 October 2012, 17:43 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on = 17 KHz :) Like you Stefan, these pioneers are pushing the limits , using = heat pumps to cool the light source, the source is as small as = possible to ensure good coupling .. reducing the duty cycle as in = radio can be a big help ... but as I say its a tool , if = anyone wants to try , it puts all the features in one box =20 G..=20 From: Stefan Sch=E4fer=20 Sent: Thursday, October 25, 2012 11:21 AM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on = 17 KHz :) Am 25.10.2012 01:34, schrieb Graham:=20 [...] fsk , of course , but simplicity is the object , switching the = (led) light off and on could reduce the duty by 50% where = heat is a problem , [...] Why should it be an advantage to reduce the duty cycle to 50% and = where do you expect heat problems when driving a LED?=20 Yes there are some high power modules but even 10W power dissipation = should be managable for everyone. 73, Stefan/DK7FC ------=_NextPart_000_007A_01CDB2E3.F36D7690 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ah yes  , but those  are   not  liner ? ,  = cannot  modulate  a  laser  , only   = on/off =20 serial  ? 
 
 
G. 

From: M0FMT
Sent: Thursday, October 25, 2012 6:15 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is = based=20 on 17 KHz :)

Hi All
 
You need erbium doped glass amplifiers like we used on long = distance=20 fibre networks.
 
73 es GL Pete M0FMT IO91UX
From: Graham <g8fzk@g8fzk.fsnet.co.uk>To: rsgb_lf_group@blacksheep.org= =20
Sent: Thursday, 25 = October=20 2012, 17:43
Subject: Re: LF:=20 OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz=20 :)

Like  you Stefan,  these  pioneers are  = pushing =20 the  limits  , using  heat pumps  to  cool = the =20 light  source, the  source is  as small  as = possible=20 to  ensure  good coupling ..  reducing  the  = duty=20 cycle  as  in radio  can  be a  big  = help=20 ...  but  as I say  its a  tool  , if =20 anyone  wants to  try , it  puts  all the  = features=20 in one  box 
 
G..

Sent: Thursday, October 25, 2012 11:21 AM
Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but = is based=20 on 17 KHz :)


Am 25.10.2012 01:34, schrieb Graham:=20
[...]
 
fsk  , of  course , but  simplicity is  = the =20 object  , switching the (led)  light  off =20 and  on could   reduce the  duty  by =20 50%  where  heat is  a problem ,
[...]

Why should it = be an=20 advantage to reduce the duty cycle to 50% and where do you expect heat = problems when driving a LED?

Yes there are some high power = modules but=20 even 10W power dissipation should be managable for = everyone.

73,=20 Stefan/DK7FC


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