Took me a while to find an answer
I'm going to try and answer my own question for anyone else trying to find the input voltage to tiny & trace.
Looks like it's limited to 5 volts but is capable of reading thru the current sensor 3s or 4s
Interesting, the older style rebranded 4hz model says it has a range of 7.4 to 12 volts.
Open the pdf file then Scroll on down http://futurehobbies.com/support/dow...ntenna-tracker