Sorry! We confused you with our conversation... haha...
(1) The best freqs generator to date is F165. You can use it with handheld electrodes alone. No other equipment is needed.
(2) If you want wireless connection (i.e. sending freqs without electrodes) then get also the scalar device SC-1A.
That is all for the Rife technology people use here!
All depends on your funds and where you are!
I can't buy F165/SC1-A myself, that is why I had to find alternatives. Hence, using computer software and quartz crystals, etc.
Hope it is clear now. :)