- #1
dnyberg2
- 125
- 2
I know that path loss is proportional to the square of the distance between the transmitter and receiver AND is also proportional to the square of the frequency in use but what does it mean when a free space calculator shows a negative number? How is it possible to get zero loss? For instance, this calculator is the one I'm picking on...
http://www.radio-electronics.com/info/propagation/path-loss/free-space-formula-equation.php
If you plug these values in you get nearly zero free space path loss!
Distance: .0305 km (100 feet)
Frequency: 1.7527 MHz
Rx antenna gain: 2 dBi
Tx antenna gain: 5 dBi
How is that possible? No free space path loss? None at all?
If you lower the frequency to 1.6 MHz, the number goes negative!
Is that an indication of gain and if so, how's that possible?
http://www.radio-electronics.com/info/propagation/path-loss/free-space-formula-equation.php
If you plug these values in you get nearly zero free space path loss!
Distance: .0305 km (100 feet)
Frequency: 1.7527 MHz
Rx antenna gain: 2 dBi
Tx antenna gain: 5 dBi
How is that possible? No free space path loss? None at all?
If you lower the frequency to 1.6 MHz, the number goes negative!
Is that an indication of gain and if so, how's that possible?