The Koch method for learning Morse code, explained

The Koch method teaches Morse code at full speed from the very first session. You start with just two characters, sent at the speed you eventually want to copy, and listen to random mixes of them until you write down about 90 percent correctly. Then you add one more character, and you keep going that way until you know them all.

It was devised by Ludwig Koch, a German psychologist, in the 1930s. The idea fits on an index card and is demanding to follow, and it is worth understanding even if you never follow it to the letter.

The three rules

1. Full character speed from the start. Every character is sent at the speed you mean to copy in the end, never slowed down for a beginner. You never hear a slow letter, so you never learn one.
2. Begin with two characters. Your first session uses only two, mixed at random. With two to choose from you can tell them apart even at speed, because you are learning two sounds, not reading.
3. Add one when you copy about 90 percent. Score each session. When you get roughly nine characters in ten right, add the next one, and mix it in with everything you already know.

That is all of it. There is no separate “learn the alphabet” phase and no “now speed up” phase afterwards. The speed stays fixed; only the set of characters grows.

Why it works

The reasoning behind the method is that a Morse character heard at speed is one sound pattern, and that learning slowly teaches a different skill from the one you need.

At 5 WPM a dit lasts 240 milliseconds and the letter H, ...., takes 1.68 seconds. That is long enough to count four beeps and look the answer up. At 20 WPM the same H takes 420 ms, and there is nothing to count: you either know the sound or you do not. A learner who starts slowly builds a habit of counting and looking up, and that habit has to be torn down before the speed can rise. The Koch method never lets it form.

It also tells you when to move on. You are not guessing whether you “know” a letter; your score says so. And because each new character arrives in a mix you already copy well, it stands out against everything familiar, which makes its sound easier to fix in memory.

What it feels like

Knowing what to expect helps, because the Koch method usually feels bad before it feels good.

The first session sounds impossibly fast. Two characters fly past, and you are sure you will never tell them apart. Then, somewhere in the session or the next, you stop thinking and just write. That moment is the method working.

Each new character knocks your score down. You were comfortably above 90 percent, the next character arrives, and you are back to struggling. That is normal. A new character can take several sessions, and an old one may wobble when a character that sounds like it joins the set.

Progress comes in steps, not a slope. Some characters land in a day. Others hold you up for a week. Neither says anything about how the next one will go.

How to run a Koch session

You need a source that sends random characters from your current set at a fixed speed: a trainer, practice files (some national amateur radio societies publish them), or a friend with a key who can send evenly. Everything else is a pencil and paper.

1. Choose a character speed and keep it. It should be fast enough that you cannot count the dits and dahs. Changing it mid-course undoes the point.
2. Listen for a few minutes and write every character as it arrives. Random groups of five are a common format; see five-letter groups for why they work so well.
3. When you miss one, leave a gap and move on at once. Never chase a missed character. Working one out costs you the next two.
4. Score honestly. Compare your copy with the text and divide the characters you got right by the characters sent. Copy 80 of 100 correctly and you score 80 percent: not yet.
5. At about 90 percent, add the next character. Below that, run the same set again tomorrow.
6. Stop while you are fresh. Tired copying practices mistakes. Short sessions, often, suit the method.

The downsides

The Koch method is effective, but it is not comfortable, and it has real gaps.

• It starts with noise, not words. Two characters make few words, and the classic order used with the method begins with K, -.-, and M, --, which make none. Early sessions are random strings, and some people find that hard to stay with.
• The start is the hardest part. Full speed with no time to think is a shock, and the first week is the easiest time to give up.
• The 90 percent bar can stall you. A pair of look-alikes, or the dit-only family of I, S, H and 5, can hold you just under the line for days.
• It trains your ear, not your hand. The method is about copying. Your sending needs its own practice.
• It leaves no room to think. At full speed with standard gaps, a beginner has no time to name one character before the next arrives.

That last point is where Farnsworth spacing helps. Combine it with Koch and the characters stay at full speed, but extra silence goes between them in the early weeks and shrinks as you improve. That keeps the method’s core, fast characters, and softens its hardest part. Farnsworth spacing: what it is and when to drop it covers how to close that extra space so it does not become a crutch.

Koch-style orders

The method fixes the speed and the pace of new characters; it does not fix the order. The classic order starts with K and M. Other orders start with the most common letters so you can make words sooner, or arrange the characters so that look-alikes never arrive close together. Which Morse code letters to learn first compares the options.

Dot & Dash uses a Koch-style course with its own order, not the classic one. It starts with E, T and A, so you key real words from the first chapter (AT, ATE, EAT, TEA), reaches HELLO in chapter 5, and keeps look-alikes such as A and N or U and V at least a chapter apart. It is built around keying rather than copying: you key each new letter, and the next chapter opens once you key the last chapter’s letters reliably. Copying by ear is a separate Listening drill in Practice, for when you want it.

Questions

Who invented the Koch method?

Ludwig Koch, a German psychologist, in the 1930s. His idea was to learn each character at full speed from the start, beginning with two characters and adding one at a time.

What speed should I use for the Koch method?

A character speed fast enough that you cannot count the dits and dahs, and one you are happy to keep for the whole course. The method only works if the characters are never slowed down.

Can I combine the Koch method with Farnsworth spacing?

Yes. Keeping the characters at full speed is the heart of the method. Adding extra space between characters in the early weeks softens the hardest part of the method, as long as you reduce it over time.

Do I have to reach exactly 90 percent before adding a character?

No. About 90 percent is the method’s rule of thumb. What matters is that you copy the current set reliably before you add to it; a point or two either way makes no difference.