DG5CW

German Telegraph Key

Junker M.T. Honnef/Rh

The Junker Morse key is a high-quality, durable, and versatile Morse code key that is well-suited for both amateur and professional use.

About the Junker Morse key

The Junker Morse key is a high-quality straight key that was invented by Joseph Junker, a German naval radio officer, in the early 1920s. It is known for its precision machining, smooth action, and long lifespan. Junker keys are still prized by Morse code enthusiasts today, and they are often considered to be one of the best straight keys ever made.

The Junker key is made from high-quality materials, including a heavy steel base plate and a cast aluminum cover. It is built to last and can withstand the rigors of everyday use. The key is also very precise, with a smooth action and a consistent contact bounce. As shown below, the Junker key has a number of features that make it a popular choice for Morse code enthusiasts: It's contact points are made of silver and thus are very durable. It has a large, adjustable lever that allows the user to control the amount of pressure needed to send a signal. It also has a unique "click-stop" adjuster for contact spacing, which allows the user to fine-tune the key to their own preferences.

Junker M.T.

front contact

"click-stop" adjuster for contact spacing

spring pressure adjuster

VERSIONS

Several modifications were made to the key over the years, (it was made until 1993), leading to different versions that I group as below, but the original design has stood the test of time.

  • Junker M.T. (D.R.P.)
  • before 1945
  • With the D.R.P. (Deutches Reiches Patent / German empire patent) label, indicating that it was made prior to the end of WW-2.
  • These early Junker keys have micrometer-feel adjustments, where each click moves the gap one-tenth of a millimeter.
  • Read More
  • Junker M.T. (D.B.G.M.)
  • after 1945
  • Civilian version with the D.B.G.M (Deutsches Bundesgebrauchsmuster / German Federal Registered Design) label.
  • Adjustment wheel with ball detent without numbers.
  • Read More
  • German Military Morse Key
  • after 1945
  • Military version (D.B.G.M.) in NATO green.
  • Bundeswehr supply number 12-xxx-xxx.
  • Control stamp in red color on the bottom.
  • Read More
  • Junker M.T. (Savings variant)
  • after 2006
  • Newer model, without click-stop mechanism for contact spacing - a rubber ring is supposed to lock it.
  • Protective cover is made of painted plastic.
  • Read More

Files

Here I collect descriptions about the Junker M.T. - in case you have additional materials to share, pls. let me know. :-)

RF choke

The RF choke is a coil of wire that is used to filter out radio frequency interference. It is located between the contact points and the base of the key. This document shows the 4 different versions of the implementation of such Funkenlöschung + Entstörung hosted below the key, as of 16/04/1974.

RF choke

The RF choke is a coil of wire that is used to filter out radio frequency interference. It is located between the contact points and the base of the key. This document shows the most common implementation.

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