After hours/days of debugging and tuning I have working reliable transmission.
Transmission time for 16bit data with 1200bps is 34ms with all sync and receiver tuning bites
Key timing component is middle capacitor, and there is some power facts
As load is connected Attiny85/1Mz with running code (no sleep) without transmitter
Power supply length
- 100n = 15ms run-time every 1s
- 1uF = 17ms run time every 13s
- 10uF = 35ms every 60s
I have now reliable transmission for 16bit value every 30minutes, It is little long time but I am on beginning
with this project.
Without load is power supply pulse 60ms long every 60s