Since I have a beginners interest in rf, arduinos and simulations, I started to back away a few posts ago.
Cheers
Beginner's ( & other's) attitudes to RF work seem to be one of the following:-
"I'm really clever, I'll download a simple circuit from the 'Net, feed it some square waves from my Arduino, & be the king of the Airwaves!"
"Waddya mean it won't work!-----It simulates OK on LTspice!"
Or:-
"I want to build a Radio receiver, so I want to know all about Maxwell's equations to do so------spend the next three days teaching me something I won't understand or need for a simple project!"
Or:-
"RF-----Aiiieeee! Black Magic!"
The truth is, RF isn't that hard, & many people have made perfectly functional RF devices without knowing calculus, Maxwell's equations, or having 40 years experience, whilst others with two out of three of those made massive stuff ups.
Be very selective in what you read about RF (or anything for that matter) on the Internet, as there is a lot of duck poo out there.
Simulations---I don't like LT spice, because it lends itself to schematics with weird layouts, doesn't allow for parasitic capacitance & inductance, & as default shows all signal sources as DC generators.(complete with the two slanted lines indicating a commutator).
This is exactly the opposite to normal practice, where the default is a symbol without the " commutator", with labelling to say if it is AC or DC.
Simulations are a trap for beginners, as they stifle the imagination.
We didn't have them & could visualise circuit operation without being hand fed.