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I doubt any of them are still sending an analog pulse train. Its probably all digitally encoded (and possibly encrypted). E.g. On the Spektrum Rx its a Wireless USB chipset. Your in the digital age now, all 01100100011010010110011101101001011101000110000101 101100 now. Why send a pulse train when you can send 11 bits (2^11 == 2048) per channel? |
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You wold still see the logic pulses being transmitted. A high or low is the logic 1 or 0, so it would be very easy to sort out individual pulses to ascertain their actualy strength. BTW. 1024pcm is only 10-bit, and would be represented by 10 digits, or possibly 12, if that is all they wished to encrypt. They might use 16 bit and use the first 4 as identifiers, then whatever it takes for the rest of the train as information.
A synchronized screen shot would look like:
1 111 11 1 1 11 11 1 11 1 1 111 111 Etc. Etc. Etc.
Or a 16-bit as 1 111 11 1 1 11 11 1 11 1 etc.
But, you would still be able to see the individual pulses.
BTW. . IFF is totally digitally encrypted, but only octal-binary encryption on channels 1,2,3a and C, 1111 is 7, with a maximum encryption of 7777. Of course Mode 4 is a bit different, running encryption from the KY encoder. . but that's all classified. I'm sure they have changed things a bit since I left the military 20 years ago. It's a lot more secure nowadays.
With a bandwidth of 1mhz, you should be able to easily isolate the individual pulses to look at them.