What The Calculator Does
This calculator computes the Received Power, Received Voltage (RMS), S meter reading and Path Loss for
a lineofsight radio system in free space. The concepts of Path Loss and Power Received are presented in
the September/October 2005 TCA (The Canadian Amateur) magazine. They can also be found
in the ARRL Antenna Book (any edition).
The lineofsight system contains: a transmitter, a lossy cable
between the transmitter and a transmitting antenna, a receiving antenna separated by R Km from the transmitting antenna, and a lossy cable between the receiving antenna and
the receiver.
How To Use The Calculator
To use the calculator click on an input box and type in the
value. There are 9 input boxes
and 4 output boxes:
Box 1: Transmitter Power [Watts]
Box 2: Range [Km]
Box 3: Frequency [MHz]
Box 4: Transmit Cable Loss [dB per 100 Feet]
Box 5: Transmit Cable Length [Feet]
Box 6: Gain of Transmitting Antenna [dBi]
Box 7: Receive Cable Loss [dB per 100 Feet]
Box 8: Receive Cable Length [Feet]
Box 9: Gain of Receiving Antenna [MHz]
Box 9: Other Losses(Cables, Tuners, Excess Path Loss, Miscellaneous Losses)
Now, press Calculate and the results are displayed in the remaining boxes.
If you do not know the values for the cable loss at the frequency of operation,
it can be found in the " Times Microwave Calculator "
for almost all coaxial cables.
