IR receiver ignoring IR pulse

[richard]

I was just looking at their optical test signal for the 60/600 ratio but it does contradict the suitable signal requirement of 10 cycles or longer burst. but looking further it seems after a "disturbance" a 1.8ms gap is required , if a beam gap of that length is unacceptable then maybe the device is unsuitable as a beam break detector

When a disturbance signal is applied to the TSOP48..
it can still receive the data signal. However the sensitivity
is reduced to that level that no unexpected
pulses will occur.
Some examples for such disturbance signals which
are suppressed by the TSOP48.. are:
• Continuous signal at 38 kHz or at any other frequency

[richard]

what happens if you send a cycle of say 100 10cycle bursts then a pause for 400uS then repeat

[The Master]

With 10 cycles per burst I set the gap to 1.8ms but I still get the problem. I also tried a 2.63ms gap and it didn't happen as easily but it still happens. I could deal with a gap of 1.8ms but it seems I need a gap of about 5ms or more before it's reliable enough.

I tested with bursts of 100 and 1,000 cycles with a pause of 400uS. This worked for a second then stopped on it's own as with the 600/600 test.

[The Master]

Not sure if this helps but I've been watching the receiver on my scope and I've noticed that if I cover the emitter slowly then the received pulses get progressively shorter in the split second before it loses the signal completely.

[richard]

I guess it doesn't want to be a beam break detector it wants to talk to remote controllers