[alasdairc]

I find it hard to believe that it is RemoteSwitch which is wrong given that I instantiate a KakuTransmitter object, give it the correct codes and it works...

Have you noticed from the signal capture that the nano never sends a long high pulse it only has long low pulses, therefore it can't represent a binary 1, acvording to the pulse lengths you just quoted.

Just look at the images and the last I posted.

Can't look at the Pi tonight as my daughter is unwell.

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I'll try Kaku new tonight on the nano, but from all my searching on line these devices use the byebye standby protocol (ie kaku old). I appreciate the help