On 26/02/2021 09:26, Ian Jackson wrote:
In message , Robin
writes
On 26/02/2021 08:40, Ian Jackson wrote:

snip

One way of finding out if an RC is actually transmitting a signal is
toÂ* hold it close to a radio with a ferrite rod aerial, and tuned to
a quietÂ* spot on the long wave. If the RC is transmitting, you will
hear aÂ* 'burpity-burp' noise when you press the a button.

How does that detect a failure of an infrared transmitter?

It won't tell you if the actual LED has failed (which is unlikely), but
it will give you pretty good confidence that the rest is OK. As Brian
has said, for the LED, some digital cameras might show you it's flashing
(even if it's not visible to the human eye).

This used to be the standard way of checking if the IR LED was flashing
but some phone cameras now have a IR blocking filter and will not detect
the IR LED on their main camera - on some of these IR filtered phones
the forward looking "selfie" will still detect the IR LED.

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