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Content preview: 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 >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 > >G.. > > >From: Stefan Schäfer >Sent: Thursday, October 25, 2012 11:21 AM >To: rsgb_lf_group@blacksheep.org >Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) > > >Am 25.10.2012 01:34, schrieb Graham: >[...] >> >>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? > >Yes there are some high power modules but even 10W power dissipation should be managable for everyone. > >73, Stefan/DK7FC > > > [...] 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 [77.238.189.192 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b8b011f938af8abc4b241335cabd0691 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) Content-Type: multipart/alternative; boundary="131296447-515700320-1351185351=:1901" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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-SCOLL-AUTHENTICATION: mtain-de04.r1000.mx.aol.com ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d40cc508974130dc0 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --131296447-515700320-1351185351=:1901 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi All=0A=A0=0AYou need erbium doped glass amplifiers like we used on long = distance fibre networks.=0A=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A>_________= _______________________=0A> From: Graham =0A>To: r= sgb_lf_group@blacksheep.org =0A>Sent: Thursday, 25 October 2012, 17:43=0A>S= ubject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on= 17 KHz :)=0A> =0A>=0A> =0A>Like=A0 you Stefan,=A0 these=A0 pioneers are= =A0 pushing=A0 =0Athe=A0 limits=A0 , using=A0 heat pumps=A0 to=A0 cool the= =A0 =0Alight=A0 source, the=A0 source is=A0 as small=A0 as possible =0Ato= =A0 ensure=A0 good coupling ..=A0 reducing=A0 the=A0 duty =0Acycle=A0 as=A0= in radio=A0 can=A0 be a=A0 big=A0 help =0A...=A0 but=A0 as I say=A0 its a= =A0 tool=A0 , if=A0 =0Aanyone=A0 wants to=A0 try , it=A0 puts=A0 all the=A0= features in =0Aone=A0 box=A0 =0A>=0A>G.. =0A>=0A> =0A>From: Stefan Sch= =E4fer =0A>Sent: Thursday, October 25, 2012 11:21 AM =0A>To: rsgb_lf_group= @blacksheep.org =0A>Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) = but is based =0Aon 17 KHz :) =0A>=0A>=0A>Am 25.10.2012 01:34, schrieb Graha= m: =0A>[...] =0A>>=0A>>fsk=A0 , of=A0 course , but=A0 simplicity is=A0 the= =A0 object=A0 , switching the=A0(led)=A0 light=A0 off=A0 and=A0 on could= =A0=A0 reduce the=A0 duty=A0 by=A0 50%=A0 where=A0 heat is=A0 a problem ,[= ...]=0A>>=0A>Why should it be an advantage =0Ato reduce the duty cycle to 5= 0% and where do you expect heat problems when =0Adriving a LED? =0A>=0A>Yes= there are some high power modules but even 10W power =0Adissipation should= be managable for everyone.=0A>=0A>73, =0AStefan/DK7FC=0A> =0A>=0A> --131296447-515700320-1351185351=:1901 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi All
=
 
You need erbium doped glass amplif= iers like we used on long distance fibre networks.
 <= /div>
73 es GL Pete M0FMT IO91UX
From: Graham <g8fzk@g8fzk.fsnet.co.uk>
= To: rsgb_lf_group@blacksheep.org
Sent: Thursday, 25 October 2012, 17:43
Subject: Re: LF: OPERA OPTICAL B= EACON (way off topic) but is based on 17 KHz :)

=
=0A=0A =0A =0A
=0A
Like  you Stefan,  these&nbs= p; pioneers are  pushing  =0Athe  limits  , using = heat pumps  to  cool the  =0Alight  source, the  = source is  as small  as possible =0Ato  ensure  good co= upling ..  reducing  the  duty =0Acycle  as  in ra= dio  can  be a  big  help =0A...  but  as I s= ay  its a  tool  , if  =0Aanyone  wants to  t= ry , it  puts  all the  features in =0Aone  box  <= /div>=0A
 
=0A
G..
=0A
=0A

=0A
=0A=0A<= div>Sent: Thursday, October 25, 2012 11:21 AM
=0A=0A
= Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based =0Ao= n 17 KHz :)
=0A


Am 25.10.2012 01:34, sch= rieb Graham: =0A
=0A =0A
[...]
=0A  
=0A
fsk  , of  course , but  simplicity= is  the  =0A object  , switching the (led)  ligh= t  off  and  =0A on could   reduce the  duty=   by  50%  =0A where  heat is  a problem ,
<= font size=3D"2">[...]
Why should it be an advantage =0Ato reduce the duty cycle to 50% and wher= e do you expect heat problems when =0Adriving a LED?

Yes there are = some high power modules but even 10W power =0Adissipation should be managab= le for everyone.

73, =0AStefan/DK7FC
=0A


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