it only needs the square positive off set wave---Dr. Clark's home made zappers could test from 20,00 to 40,000, so I wouldn't worry.
Are you reading her book for insights as to what to expect? I have no idea what you think will happen, but Dr. Clark warns using it on an illness to prove it 'works' was not effective.
What do you expect??
Rife and Clark are not linked in any way. She did all her own frequencies based on her sycrometer readings. I'm guessing they probably didn't know of each other till later, if at all.