path: root/README.md

# calctenna.py

## Calculate dipole antenna leg length

```text
usage: calctenna.py [-h] -f [frequency] [-V [velocity_factor]] [-q]

optional arguments:
  -h, --help            show this help message and exit
  -f [frequency], --frequency [frequency]
                        desired frequency in Hz (e.g. 144800000 or 433e6, ...
  -V [velocity_factor], --velocity-factor [velocity_factor]
  -q, --quiet           print only result
```

### Example output

```text
$ calctenna.py -f 104e6
Desired Frequency: 104e6 Hz
Wavelength: 2.883 m
Wavelength / 2: 1.441 m
Wavelength / 4: 0.721 m
Velocity factor: 0.951
-> Dipole leg length (lambda/4): 0.685 m
```