I was testing on Hamamatsu module C5460, reluctant (or lazy) to fix up a 
receiver myself.  It looks like this unit is a DC supersensitive type. 
Guess, it is a reset to start from scratch again.

In meantime, keep your data and suggestions coming.

Ling

>>typo, my bad.
>>
>>  Not yet, when I tune the receiver to be insensitive to 
>>daytime light, it *cannot* pick up my beam 10m away.  If it 
>>is tuned to be sensitive to my beam, the daytime light 
>>saturated the Rx.
> 
> 2) modulate the emitter (high current low duty ratio
> pulse) and use AC coupling in the receiver side.
> 
> 3) reduce the DC biasing resistor of the receiver and reduce 
> the aperture size so DC light will not saturate the receiver.
> 

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