But hey... it doesn't matter. I'll let you learn all the lessons I did the hard way if you ever get into acro & race quads. That's the only way you'll really understand.
Perhaps.
I've spent the last 2 days learning 2.4GHz radio control conventions. Not the RF part, the Dunlop connector part. It is not obvious! Did not help that the receiver had its Dunlop pin array fried; apparently previous owner had an accident involving a motor controller giving the receiver WAAAY to much current; one 5V feeder pin was gone, as in desoldered, and one was molten and only half as long as the others..
The modern RC control receiver runs on 5VDC, and has a connector field that is a 3-row Dunlop pin header array, as on RPi computers etc. Each group of three adjacent pins is 0V, +5V, and control. 0V and +5V are bussed. Control is a PWM output pulse train running at (in this particular case) about 71.63Hz with a pulse width varying over 1...2ms. Controls that are positive only (like engine throttle) start at 1ms and increase to 2ms; controls that have a center null of course start at 1,5ms and range from 1 to 2 ms.
As it turns out the molten one was on the servo row where motor controller must go (if you want sensible control lever disposition) and this did complicate fault-finding.
Not until I'd powered the receiver from the 6205B (and monitored it with the 427A, hi, BD!) and looked at the signal outputs with the ScopeMeter did things start to be comprehensible to me.
As it turned out, the 5V bus joining all the 5V pins was broken too, so now there's a bodge wire on the back of the PCB. And, I've cut out those 6 pins that were in the two damaged rows and replaced them with a new 3x2 section of header from a dead Arduino Micro clone.
Best part? The Boy plane-owner, who was watching me learn this, simply stated: "It is really cosy here at the bench".
He's out crashing the plane now.