10-03-2015, 17:25
(10-03-2015, 10:10)meteoestarreja Wrote: About the antenna, how did you get the 17.3 cm value? From my calculation, 17.3 would be somewhere around 428,3 Mhz
Of course you are right about the value of the 1/4 wavelength for a 433.94MHz frequency, where l= c/f
l = wavelenght
c= speed of propagation (usually light speed)
f = frequency
but some time ago, using Google I found several references to a formula to calculate the length of single wire (whip) antenna.
The formula is: 75/frequency(MHz) = length in meters
which for 433.94MHz, results in a whip antenna length, of 17.28cm
Certainly you could investigate about this matter