Here arethe three purchases for ttn modiin .
The Antenna I am told that people have got 70km using SF12 and this antenna Lets see if it what I get SF12 is not useful it takes too much time and low baude rate.
A heat sink for the rak831
This will allow me to remove the forced air cooling Fan and pasive cooling.
The relays are for my first commercial product Off grid secure dry contacts with a multi year lifetime on bank of18650 .
lifespan Based on one status change per day. ( Lora class A or B)