tetrode

Does a VHF tetrode not have a lower bound on its operating frequency when operating at such a high power?

We've not got a good way around it yet, at least for little tetrode like probes you have to insert.

On the other hand, for commercial purposes, it is not feasible to stick a wired-tetrode array into a human brain yet.

So your patch-clamping, pipette drawing, and tetrode dropping skills were a bit more prized.

At only 198kHz—which is somewhere between one 1/500th and 1/1500th its normal operating frequency—any high power VHF transmitting tetrode would be just loafing along.

Any commonly available high powered RF tetrode from an FM or TV station would do the job albeit with some (mostly mechanical) modifications to the transmitters.

In grad school I had a friend that was doing olfactory (smell) research on rats with tetrode drives (wires in their brain).

TIL tetrode has a special meaning in biology: a four-conductor microelectrode for probing neurons that gives essentially a direction reading along with amplitudes from each of the four electrode components.

I've written multi-tetrode cluster analysis SW.

I have a general concept of what's going on - maybe someone with more knowledge can correct me: the video shows the guy building a tetrode, which is a way to either control voltage or current depending on how its used.

The "normalization" in Section 3.2 (e.g., k = 0.087 → 0.87 for water) is from entropy correction: ΔH_vap = F_bond - T ΔS_rot, where ΔS_rot ≈ 0.05 F_bond for rotational freedom (from Sackur-Tetrode equation).

The entropy of an ideal monatomic gas depends on the mass of its atoms (see the Sackur–Tetrode equation).