I have just bought another KA-6 receiver, and it doesn't seem to behave the same. Although the new one looks the same as previous one, the leading edge of all servo drive signals seem to occur at the same moment, so I am faced with a struggle to time stamp the pulse edges.
But, Robin2 - if I have misunderstood your message about delivering the pulses to separate Arduino pins, and I can capture the time for both ends of all channels to a reasonable accuracy (as opposed to resolution), then I would welcome your thoughts.
Going back to your first sentence - "what is the purpose of all this?" - I am struggling to expand on what I have said already. I'm sure it's a diversion to go into the "business logic" of how that information is used after it's gathered, but basically radio control gear is telemetering six off eight bit values at a repeat rate of 50 samples per second.
my question was:- "Do any of you know if it's now normal, or at least, common for the radio receiver to send all servo drive pulses at the same time, not sequentially?"
I find it a bit curious that there's nobody saying "Yes, receivers are all like that nowadays" or "That's unusual. The ones I have send their pulses sequentially".