From arunk at speedpost.net  Sat Dec  1 05:35:44 2007
From: arunk at speedpost.net (Arun Krishnan)
Date: Sat, 01 Dec 2007 11:05:44 +0530
Subject: [Ronja] detector
In-Reply-To: <475012AA.4070304@freemail.hu>
References: <475012AA.4070304@freemail.hu>
Message-ID: <1196487344.32105.1224214425@webmail.messagingengine.com>

Hiya.

I was under the impression that the main thing holding back 100Mbps
RONJA is a suitable LED? I found several PIN photodiodes on OSRAM's site
which were more than adequate for 100Mbps usage and cost next to
nothing.

Regards,
Arun


----- Original message -----
From: "Gyurk? Martin" <asteri_x at freemail.hu>
To: "Twibright Ronja" <ronja at lists.pointless.net>
Date: Fri, 30 Nov 2007 14:39:54 +0100
Subject: [Ronja] detector

Hey guys!

Just found on ebay:

http://cgi.ebay.com/Lot-of-5-80MHz-Si-PIN-Photo-Diode-for-Laser-Diode-Sense_W0QQitemZ270191338452QQihZ017QQcategoryZ4660QQcmdZViewItem

Anyone already made some experiences with it?
Seems to be suitable for 100Mbit receiver. (31.25MHz is much lower than 
the 80MHz)

bye
Martin


-- 
Twibright Ronja mailing list http://ronja.twibright.com
Ronja at lists.pointless.net
http://pointless.net/mailman/listinfo/ronja


From clock2 at centrum.cz  Sat Dec  1 20:42:03 2007
From: clock2 at centrum.cz (Karel Kulhavy)
Date: Sat, 01 Dec 2007 21:42:03 +0100
Subject: [Ronja] Pyroelectric receiver?
In-Reply-To: <e692861c0711291928hf1dbe11v8657d7b0833a2e4c@mail.gmail.com>
References: 917955.64399.qm@web32714.mail.mud.yahoo.com>
	<917955.64399.qm@web32714.mail.mud.yahoo.com>
	<e692861c0711291928hf1dbe11v8657d7b0833a2e4c@mail.gmail.com>
Message-ID: <200712012142.7870@centrum.cz>

>On Nov 29, 2007 9:38 PM, alex dinovitser <adinov na yahoo.com> wrote:
>> I am surprised you are using a photodiade for this application because
of the
>> problems with ambient light and the possibility of DC saturation. Why

Are you having problems with ambient light on Ronja? If yes please write in what situation so I can solve it as a bugreport.

CL<



From bms at incunabulum.net  Mon Dec  3 10:23:58 2007
From: bms at incunabulum.net (Bruce M Simpson)
Date: Mon, 03 Dec 2007 10:23:58 +0000
Subject: [Ronja] UA733 vs NE592
Message-ID: <4753D93E.1020008@incunabulum.net>

Can anyone confirm or deny that the UA733 is O.K. as a substitute for 
the (now obsolete and hard to obtain) NE592?

The ronja.twibright.com site lists it as such, although I saw a thread 
from 2004 on this list which says that, whilst both are pin-for-pin 
compatible,  they may not be drop-in replacements.

many thanks
BMS


From pkyaduvanshi at gmail.com  Tue Dec  4 09:36:19 2007
From: pkyaduvanshi at gmail.com (Pramod yaduvanshi)
Date: Tue, 4 Dec 2007 15:06:19 +0530
Subject: [Ronja] UA733 vs NE592
Message-ID: <50d3ad760712040136y6b9c0042g2e8bae616f142256@mail.gmail.com>

I have used UA733 and performance is satisfactory so there is no problem in
case you want to use UA733 in place of NE592 in case you are not able to
find NE592 you can try taking out from some old floppy disc drive.
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From gartner at petronline.com.br  Sat Dec  8 01:22:16 2007
From: gartner at petronline.com.br (gartner at petronline.com.br)
Date: Fri, 7 Dec 2007 23:22:16 -0200 (BRST)
Subject: [Ronja] Twister and pulse extenders
Message-ID: <4749.200.255.96.29.1197076936.squirrel@www3.compuland.com.br>

Hi:

I would like to understand better the twister.
I would appreciate a lot if someone could help me.

In the FAQ is said that the 5Mhz (preamble) and 10Mhz (CRC) pulses are
merged together by U63. But why they are merged together ?

I'm trying to understand the mechanism of separating and sending the
frames and getting them back together in the other side. Could someone
help me ? I read the FAQ but I don't quite understand it yet.

Thanks,
JG




From discover at fly.srk.fer.hr  Sat Dec  8 13:22:54 2007
From: discover at fly.srk.fer.hr (Silvije)
Date: Sat, 8 Dec 2007 14:22:54 +0100 (CET)
Subject: [Ronja] NEW emitter suitable for future improved RONJA
In-Reply-To: <4753D93E.1020008@incunabulum.net>
References: <4753D93E.1020008@incunabulum.net>
Message-ID: <Pine.LNX.4.64.0712081413510.10735@fly.srk.fer.hr>



http://www.led1.de/shop/product_info.php?pName=original-luxeon-rebel-star-lxmspd010030tray-red-65-lumen-p-1001&cName=luxeon-power-leds-luxeon-rebel-star-c-111_221

http://www.led1.de/datasheet/Rebel.pdf

Enjoy!

ps. I think these are even better than luxeon k2, they have smaller 
aperture so can be easily focused to a smaller spot and they have better 
output for same current. New led driver design is needed!


Silvije


From cd930 at centrum.cz  Sat Dec  8 17:34:52 2007
From: cd930 at centrum.cz (-=RYS=-)
Date: Sat, 08 Dec 2007 18:34:52 +0100
Subject: [Ronja] NEW emitter suitable for future improved RONJA
In-Reply-To: <Pine.LNX.4.64.0712081413510.10735@fly.srk.fer.hr>
References: 4753D93E.1020008@incunabulum.net>
	<4753D93E.1020008@incunabulum.net>
	<Pine.LNX.4.64.0712081413510.10735@fly.srk.fer.hr>
Message-ID: <200712081834.19352@centrum.cz>

Hi Silvije, this is nice LED. Driver can by via mosfet transistor.
Please, is this LED workable for 100Mbps? I think workable to 50, 100, 150... MHz?
-=RYS=-


______________________________________________________________
> Od: discover na fly.srk.fer.hr
> Komu: Twibright Ronja <ronja na lists.pointless.net>
> Datum: 08.12.2007 15:28
> P?edm?t: [Ronja] NEW emitter suitable for future improved RONJA
>
>
>
>http://www.led1.de/shop/product_info.php?pName=original-luxeon-rebel-star-lxmspd010030tray-red-65-lumen-p-1001&amp;cName=luxeon-power-leds-luxeon-rebel-star-c-111_221
>
>http://www.led1.de/datasheet/Rebel.pdf
>
>Enjoy!
>
>ps. I think these are even better than luxeon k2, they have smaller 
>aperture so can be easily focused to a smaller spot and they have better 
>output for same current. New led driver design is needed!
>
>
>Silvije
>
>-- 
>Twibright Ronja mailing list http://ronja.twibright.com
>Ronja na lists.pointless.net
>http://pointless.net/mailman/listinfo/ronja
> 


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From discover at fly.srk.fer.hr  Sat Dec  8 17:51:41 2007
From: discover at fly.srk.fer.hr (Silvije)
Date: Sat, 8 Dec 2007 18:51:41 +0100 (CET)
Subject: [Ronja] NEW emitter suitable for future improved RONJA
In-Reply-To: <200712081834.19352@centrum.cz>
References: 4753D93E.1020008@incunabulum.net>
	<4753D93E.1020008@incunabulum.net>
	<Pine.LNX.4.64.0712081413510.10735@fly.srk.fer.hr>
	<200712081834.19352@centrum.cz>
Message-ID: <Pine.LNX.4.64.0712081846090.22398@fly.srk.fer.hr>


I dont think it can be used for 100Mbps.
I was thinking it could be used for 10 Mbps but because
of it's output power people could have longer range or
better margin in bad weather...

also I dont have any data on tr and tf or bw...
check the datasheet, maybe there is something

I am afraid you have to order it and test it..

but if luxeon I was good enough for 10 Mbps, and it was
according to my experiments, this is really an improved
luxeon LED, only in smd package :)

s.


On Sat, 8 Dec 2007, -=RYS=- wrote:

> Hi Silvije, this is nice LED. Driver can by via mosfet transistor.
> Please, is this LED workable for 100Mbps? I think workable to 50, 100, 150... MHz?
> -=RYS=-
>


From gmaxwell at gmail.com  Sun Dec  9 02:30:12 2007
From: gmaxwell at gmail.com (Gregory Maxwell)
Date: Sat, 8 Dec 2007 21:30:12 -0500
Subject: [Ronja] NEW emitter suitable for future improved RONJA
In-Reply-To: <Pine.LNX.4.64.0712081846090.22398@fly.srk.fer.hr>
References: <4753D93E.1020008@incunabulum.net>
	<Pine.LNX.4.64.0712081413510.10735@fly.srk.fer.hr>
	<200712081834.19352@centrum.cz>
	<Pine.LNX.4.64.0712081846090.22398@fly.srk.fer.hr>
Message-ID: <e692861c0712081830ubfe4189le5653547912efcc7@mail.gmail.com>

On Dec 8, 2007 12:51 PM, Silvije <discover at fly.srk.fer.hr> wrote:
> I dont think it can be used for 100Mbps.
> I was thinking it could be used for 10 Mbps but because
> of it's output power people could have longer range or
> better margin in bad weather...

Most likely any of the leds used at 10mbit could achieve 100mbit with
the right modulation and driver circuitry.

> also I dont have any data on tr and tf or bw...
> check the datasheet, maybe there is something
>
> I am afraid you have to order it and test it..
>
> but if luxeon I was good enough for 10 Mbps, and it was
> according to my experiments, this is really an improved
> luxeon LED, only in smd package :)

Some of these new Rebel Star LEDs are not even listed on the
luxeonstar.com website yet. For example the red one you linked to is
not listed yet.


From renobunsoy at yahoo.com  Mon Dec 10 16:10:37 2007
From: renobunsoy at yahoo.com (Reno Bunsoy)
Date: Mon, 10 Dec 2007 08:10:37 -0800 (PST)
Subject: [Ronja] LED problems (Philippines)
Message-ID: <105081.37921.qm@web52008.mail.re2.yahoo.com>

The only available transmitter LED here in the Philippines is the TLWR-7600. Is it really suitable only for testing? How far is its maximum range? Is it really possible to establish a reliable connection with this LED? Thank you so much for the help.


All that is gold does not glitter, 
Not all those who wander are lost; 
The old that is strong does not wither, 
Deep roots are not reached by the frost. 

 

>From the ashes a fire shall be woken, 
A light from the shadows shall spring; 
Renewed shall be blade that was broken,

The crownless again shall be king.  


       
---------------------------------
Never miss a thing.   Make Yahoo your homepage.
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From clock2 at centrum.cz  Thu Dec 13 15:15:19 2007
From: clock2 at centrum.cz (Karel Kulhavy)
Date: Thu, 13 Dec 2007 16:15:19 +0100
Subject: [Ronja] Which parts you cannot get?
Message-ID: <200712131615.6979@centrum.cz>

I wonder if there are parts you cannot get and you would be willing to order by mail even if bank transfer in advance (IBAN, no Paypal) were required. I could then buy them in
a larger amount and sell individually this way. The best way would be to bundle several parts into one order of course since this saves postage and the bank transfer fee.

Is it true that an IBAN bank transfer within Europe is now for free?

CL<



From bms at incunabulum.net  Sat Dec 15 18:59:34 2007
From: bms at incunabulum.net (Bruce M Simpson)
Date: Sat, 15 Dec 2007 18:59:34 +0000
Subject: [Ronja] Which parts you cannot get?
In-Reply-To: <200712131615.6979@centrum.cz>
References: <200712131615.6979@centrum.cz>
Message-ID: <47642416.2060203@incunabulum.net>

Hi Clock,

Howdy, bit of a long one this...

Karel Kulhavy wrote:
> I wonder if there are parts you cannot get and you would be willing to order by mail even if bank transfer in advance (IBAN, no Paypal) were required. I could then buy them in
> a larger amount and sell individually this way. The best way would be to bundle several parts into one order of course since this saves postage and the bank transfer fee.
>
>   

The following are scarce, in my experience, in supplies which 
individuals can easily acquire in the UK:

 * NE592 low noise high bandwidth op-amp
The UA733 seems to be an acceptable substitute? Farnell have the UA733.

 * 74HC133  13-input single NAND gate
This just seems to be out of fashion -- whilst Farnell have it, it's US 
stock and costs 18 UKP just to get shipped in.

 * HPWT-BD00-F4000 Lumileds Superflux
When a friend of mine spoke to a distributor, possibly Lumileds, about 
this part, he was told it was a special variant produced for a customer 
as a one-off.

I have however acquired some weaker Lumileds parts on the basis that 
Nebulus/Inferno is really the way to go for us, or so I believe, and 
visible light spectrum is more O.K. for demonstration and teaching purposes.

> Is it true that an IBAN bank transfer within Europe is now for free?
>   
Yes and no. The EU is meant to be bringing this in:
    http://en.wikipedia.org/wiki/Single_Euro_Payments_Area

Whilst the UK banking sector have adopted the IBAN, as the EU requires 
them to do, they don't appear to be doing anything about Euro-zone 
electronic payments...

...other than panicking and trying to push the problem onto the 
customer, that is:
    http://www.finextra.com/community/fullblog.aspx?id=417

The last time I asked my British bank about this, they were going to 
charge me 10 UKP to send a payment to Germany.

It's unacceptable, it has to stop, and it remains to be seen if the UK 
banks actually listen to the EU when the SEPA legislation comes into 
force next month.

cheers.........
BMS



From clock2 at centrum.cz  Wed Dec 26 11:59:47 2007
From: clock2 at centrum.cz (Karel Kulhavy)
Date: Wed, 26 Dec 2007 12:59:47 +0100
Subject: [Ronja] Underwater Ronja as a thesis
Message-ID: <200712261259.31736@centrum.cz>

There is a thesis about short range underwater optical link based on Ronja
from Mark Alan Chancey from North Carolina State University
http://www.lib.ncsu.edu/theses/available/etd-07252005-171301/unrestricted/etd.pdf

It?s an interesting idea and experiment. Just his receiver PCB/mechanical design apparently opens way to a lot of crosstalk between the individual RX stages
and he describes problems with sensitivity and signal integrity. He says he uses a NTE 415 dual gate MOSFET for which I was unable to find a datasheet online.

CLK



From cd930 at centrum.cz  Wed Dec 26 17:50:06 2007
From: cd930 at centrum.cz (CD930)
Date: Wed, 26 Dec 2007 18:50:06 +0100
Subject: [Ronja] Underwater Ronja as a thesis
References: <200712261259.31736@centrum.cz>
Message-ID: <000c01c847e7$c07d1720$0101a8c0@Martindoma>

Zajimava, ale kacirska myslenka.
1) Nikde se zde nepise o sladke vode (prehrady, jezera)....Nechranice mam 
14km ode me, na letni pokusy dobry....
2) Jaka vhodna vlnova delka svetelneho zdroje po sladkou vodu?
3) Ten FM TRX bych po vodou nahradil spise dlouhovlnnym systemem, prece 
jenom 10-20kHz se pod vodou siri lepe (audio, pomala data) nez svetlo...i 
ponorky pracuji v tomto pasmu.

Podle meho by tohle mel prakticky smysl tehdy, kdyz pod vodou pracuje keson 
a potreboval by spojeni s povrchem, ktere mu zajisti povrchova retlanslacni 
boje.
Takto se to bezne pouziva...i u nas.

Na druhou stranu je zajimava myslenka pouzit 10W laser diodu, ale cena 
takove diody je vetsi nez dlouhovlnne radio.
Leda pro prenos 10MBps dat (video)...to se na DV pretahnout neda.
Mluvim o bezdratovych systemech....

-=RYS=-



----- Original Message ----- 
From: "Karel Kulhavy" <clock2 na centrum.cz>
To: "ronja" <ronja na lists.pointless.net>
Sent: Wednesday, December 26, 2007 12:59 PM
Subject: [Ronja] Underwater Ronja as a thesis


There is a thesis about short range underwater optical link based on Ronja
from Mark Alan Chancey from North Carolina State University
http://www.lib.ncsu.edu/theses/available/etd-07252005-171301/unrestricted/etd.pdf

It?s an interesting idea and experiment. Just his receiver PCB/mechanical 
design apparently opens way to a lot of crosstalk between the individual RX 
stages
and he describes problems with sensitivity and signal integrity. He says he 
uses a NTE 415 dual gate MOSFET for which I was unable to find a datasheet 
online.

CLK


-- 
Twibright Ronja mailing list http://ronja.twibright.com
Ronja na lists.pointless.net
http://pointless.net/mailman/listinfo/ronja