You need not only a 2ms at least preamble but also some kind of data encoding to keep the balance of the 1 and 0 to 50%. So Terminal will not help much except if you can transmit the character with this binary number: 10101010 or 01010101.
That means definetly Manchester or Biphase encoding as it is the easiest to implement.
Do a search on the forum and many answers on the topic Manchester will be found (mine too!).
Please re-read the data sheets of the XTR. Answers included!
By the way, you new schematic, I believe will ton work! XTR is supplied through a capacitor and data are fed through 10K and 100K resistors. Are sure about the values? I'd rather choose your first one.
Ioannis
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