[Laser] SD3084 photodiode

[Robo]

Hi Yves and all folks,

I mean, that BPW34 is only for start of 
experience with optical QSO (or ham etalon :-) ).
Good PIN photodiodes is strating price about 20USD and up.
for example: C30807 good ratio price/quality
Small active area have better ratio signal noise

I mean, thats one of way is APD!!!
Anybody have any experience, here?
I have APD from Eg&g C30902E

om1arl
http://www.foton.sk/technika.html

At 07:51 PM 5/11/2007, you wrote:
>
>I got from  old laser barcode scanners 3 hybrid photodiodes SD3084 from  SDC.
>These diodes  contains in a TO5 package a very small PIN photodiode (less
>than 1 mm²), a JFET,  a resistor.
>After some  experiments I identified the good wiring and I built a K3PGP RX
>with one of  these old components.
>I am very  surprised because without lenses this receiver has about the same
>sensitivity limit an other K3PGP RX fitted with a 7,5 mm² PIN photodiode
>BPW34 (tested with my adjustable LED beacon at 300 Hz).
>If we  consider the sensitive areas ratio that could mean the SD3084 has
>about 8 dB better SNR than a BPW34.
>I have no  parameter about the SD3084 photodiode.
>Is there  somebody having some information about this  component?
>Yves  F1AVY
>
>
>
>
>_______________________________________________
>Laser mailing list
>Laser at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/laser