Hello,
I understand your problem. The reason you are having troubles is requirement to use the Spektrum satellites instead of normal receiver that is recommended in any way by Spektrum.
With for example AR7700 receiver all would be just fine.
SPM4649T is actually not true SRXL receiver - this is little bit incorrectly stated by Spektrum.
You can always do every step independently of others so yes, to bind the Spektrum satellite you have to do it first. So binding satellites should be done before connecting anything additional.
Since SPM4649T is an addition it is considered everything basic was done previously. Then proceeding according the guide for Spektrum integration will tell you how to do this.
There you can find how binding of the SPM4649T can be performed.
Quote:
In case that your SPM4649T receiver is not bound yet, you can do so by a Bind plug. Connect the Bind plug to the servo socket. Then power up the receiver (you can use BEC power supply and/or free port in the unit such as CH0 or AUX2). Optional satellites can be bound normally as described in the Manual.
So actually you can bind the SPM4649T even completely without the Spirit unit. Only bind plug + power from BEC is needed. That is way how Spektrum designed it.
SPM4649T has two connectors without a difference except male/female. It is just like an Y-cable. So you could use any of these connectors to perform the same thing.
For example you can use connector not intended for binding for binding process.