Where do I find a transmitter?

Hint 1 of 9:

You'll need two parts to make the transmitter for the panel.

Hint 2 of 9:

The first is something to help generate the signal.

Hint 3 of 9:

Like something that you might have used to build an old-fashioned radio.

Hint 4 of 9:

The crystal computer in room 9 reminds Kirk of such a radio.

Hint 5 of 9:

So "get" the computer to take a piece of crystal from it.

Hint 6 of 9:

And now you need a crude antenna.

Hint 7 of 9:

Something that's made of metal.