Tools:

- ADsimPLL
- `https://leleivre.com/rf_pll_loop_filter_3rd.html`
- `https://github.com/analogdevicesinc/no-OS/tree/master/drivers/frequency/adf4106/`

References:
- https://ea3cno.wordpress.com/2019/09/22/oscilador-pll-de-25-mhz/
- https://destevez.net/2016/08/improving-phase-noise-performance-of-the-df9np-27mhz-pll/

Antenna:
- http://jcoppens.com/ant/helix/calc.en.php
- https://ea3cno.wordpress.com/2021/07/07/antena-helicoidal-para-13-cm/
- Look in RSBG uW and Rothammel too