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# PyCubed Connectors

PyCubed comes with an SMA Female connector installed for Radio #1.

• [ ] Use SMA Male cables or antennas to properly mate with the onboard connector.
• [ ] If using the default PyCubed radio, make sure the antenna is appropriate for 433 MHz

Illustrating the difference between SMA Male and SMA Female connectors.

# Benchtop Testing

## Wire Monopole

For development work inside or outside the classroom, the most inexpensive antenna solution is simply soldering a piece of wire to the center conductor of the SMA connector on the bottom of the board. The piece of wire forms a monopole antenna.

For a quarter-wavelength monopole antenna:

1. Calculate the wavelength of your center frequency

$\lambda = \frac{C}{f}$

where c is the speed of light (about $3\times10^{8}$ m/s) and f is the frequency in Hz

2. Divide wavelength by 4: ($\lambda/4$ ) to determine the correct length of wire

Sparkfun illustration of a monopole antenna

For 433 MHz

f = 433 MHz = $433 \times 10^{6}$ Hz

$\lambda = \frac{3\times10^{8}}{433 \times 10^{6}} = 0.69284$ meters

$\lambda/4 = 0.69284/4 = 0.1732$ meters = $173.2$ mm wire

## Whip Antenna

Commercial "whip" antennas are relatively inexpensive as well and will mount directly to the RF connector on the PyCubed board.