I own several HM-TRP TTL FSK radio modules, and every time I turn one on, it reports it as being version 2.
Anyways I did read the manual and it has a setting for transmitter power as follows:
0 = +1 dbm 1 = +2 dbm 2 = +5 dbm 3 = +8 dbm 4 = +11 dbm 5 = +14 dbm 6 = +17 dbm 7 = +20 dbm
How do I convert these values to transmission distance in meters if all of the following conditions are met:
A. The transmitter module and receiver module are powered with a steady 3VDC B. There are no other objects between this transmitter and an HM-TRP receiver C. The receiver's noise floor is at maximum D. Both modules have copper coil antennas measuring about 1cm in length and the end is connected to the ANT pin on the module E. Both modules operate at the frequency 915 Mhz. F. Both modules use a UART data rate of 38400bps and a wireless data rate of 38400bps as well.
So what's the formula?
So I'm trying to understand here... Do I use the formula for path loss and subtract that from the transmission DBM setting I select in my receiver and if the result is not negative then I get a signal?
And I got two different equations for calculating path loss. Which is officially correct?