[Laser] Results form a crude signal to noise versus frequency check on my optical receiver

[Zack Widup]

On Thu, 16 Mar 2006, Kerry Banke wrote:

> After following the discussions on signal to noise versus frequency for the 
> K3PGP type front end, I finally broke down and performed a crude test 
> on  own receiver last evening.  The receiver setup is a 4" glass lens with 
> 8" FL into an SFH-203 PIN diode ( 1 mm2, 11 pF)  detector followed by an 
> MPF102 with no bias resistor, MPSA18 Bipolar transistor  stage and an LM386 
> amplifier. 

Anyone have a source for 4" lenses?  I've had a hard time finding 
something that size.  3" lenses abound but I'd like something bigger at a 
reasonable cost.

73, Zack W9SZ