[Laser] New Cloud bounce system being built Optical detectors Tim Toast

Wed Jul 13 11:46:22 EDT 2011

Tim,

Sorry I missed this response for a while.
I really appreciate the answer.

I found a hybrid detector amp in my pile of stuff.
It has an  area of 5mm2 
The peak response is at 940NM 
Its made by advanced photonics but right now I cannot remember the model.
Although I do remember that is much quieter than the BB  OPT301 I used
during the one way Contact I did about 10 years ago.

Here is the filter am using  in front of the device. 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=310313273043&ssPageName=S
TRK:MEWNX:IT#ht_500wt_922

Only 8% transmission loss and very sharp skirts

The last time I did this see here
http://www.rescueelectronics.com/Optical_Comms.html

I used 814 940 LEDS I stripped from CATV remotes.  Many Many hours of work.
The diodes I used were approx..  25 mw/SR  with 50% beam width  of 50
degrees

These diodes:
http://www.paralight.us/uploads/pdf/EP2012-350IR1.pdf

are the one I will be using for this project.
Each diode is  1 watt/SR in  50% beam width of 10 degrees.

The  100 diodes will be in any day now.
The array will have an output power of greater than 100 watts/SR.

The frequency of choice will be 450 HZ  divided down from 1.8432 Mhz
crystal.
I will investigate this list of detectors Tim.

But for the moment I wonder if it is possible for some to build a detector
amplifier that would have a noise advantage over
manufactured hybrid.

Paul A. Cianciolo
W1VLF
http://www.rescueelectronics.com/
Our business computer network is  powered exclusively by solar and wind
power.
Converting Photons to Electrons for over 20 years

-----Original Message-----
From: laser-bounces at mailman.qth.net [mailto:laser-bounces at mailman.qth.net]
On Behalf Of Tim Toast
Sent: Wednesday, June 29, 2011 3:40 AM
To: laser at mailman.qth.net
Subject: Re: [Laser] Preferred Optical detector device

Hi Paul

Here are some common photodiodes mentioned or used by people on this list:

PD-3
PD-4
PD-10d
020-72-60-541
CLD-142
PDV-V417-ND
PNZ331F
PDB-V107
PDB-V112
PDB-V117
SFH-214
SFH-203
BPX65
BPW33
BPW34
IPL10040DW
OSD1-5T
RT5-2354DTS-C2
RT5-2394
S2386-18K
S5973

These diodes have surface areas ranging from less than
1 mm, up to about 1 sq inch or so. I think for NLOS you would want one with
a large area generally for a large FOV. The idea being the receiver field of
view should at least match the size of the tx spot on a cloud or other
object.

-toast

> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 14 Jun 2011 19:54:15 -0400
> From: "Paul A. Cianciolo" <paulc at snet.net>
> Subject: [Laser] Preferred Optical detector device.
> To: <Laser at mailman.qth.net>
> Message-ID: <[email protected]>
> Content-Type: text/plain;    charset="us-ascii"
> 
> Hello Folks,
> 
> Getting interest in NLOS optical Comms again.
> 
> What is the preferred detector/preamp scheme for low audio frequency 
> NLOS detection.
> 
> My diode array is at 940 nm
> 
> 
> 
> I did cloud bounce years ago.  Not I have a friend who may be 
> interested In doing some experiments with me.
> 
> Is the K3 PGP detector amp still the best choice.
> 
> Anyone know the availability of a good photodiode for this purpose???
> 
> Thank you for any help
> 
> 
> 
> 
> 
> Paul A. Cianciolo
> 
> W1VLF
> 
> http://www.rescueelectronics.com/
> 
> Our business computer network is  powered exclusively by solar and 
> wind power.
> 
> Converting Photons to Electrons for over 20 years
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