Koch Lesson 7: Add the Letter T

Why this step

T is one dah — the second most common English letter. Koch delayed it so you would not treat every dah as T. After M (two dahs) is solid, a single dah becomes a new length, not a guess.

What to hear

T is short. M is twice as long. If you name T whenever you hear “a dash,” you will steal copies from M. Measure length against the character speed you already use.

Drill

Active set: K, M, R, S, U, A, P, T. Isolated T vs M is the exam. The shareable URL keeps lesson=7 so a friend does not inherit a later unlock from their own browser storage.

Letter groups you can type in the translator once the ear is warm: AT, ST, RT, TM

Pitfall

Dropping character speed “just for T.” That reintroduces counting. Use Farnsworth if you need thinking time.