A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the high-frequency traces short and away from the edges of the board. Use a common mode choke or ferrite bead to filter the input power.
Use the lowest possible input voltage, enable the low-power mode (LPM) when not transmitting, and adjust the transmit power to the minimum required for your application. Also, consider using a low-power microcontroller and optimizing the system's sleep modes.
The maximum cable length depends on the frequency and cable type. As a general rule, keep the cable length as short as possible (less than 10 inches) to minimize signal loss and reflections. Use a high-quality, low-loss cable with a 50-ohm impedance.
Use a high-quality crystal with a tight frequency tolerance (e.g., ±10 ppm). Ensure the crystal is properly loaded and matched to the oscillator circuit. Also, consider using a crystal oscillator with a built-in capacitor or a dedicated oscillator IC.
A quarter-wave monopole or a dipole antenna with a 50-ohm impedance is recommended. The antenna should be designed to resonate at the operating frequency (868 MHz) and have a return loss of at least 10 dB. Consider using a PCB antenna or a external antenna with a good radiation pattern.
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