RM-31 Morse hand key
This almost 60 year old CW key was made for the Czechoslovakia military (CSLA) radios. The first radio station where this key was used the RM 31 (Super Tana) was developed in 1952 so the key could be dated into 50's but commonly used and known is the key with later radiosets from 60's. This key is known as the RM-31 Telegraph Key (Telegrafni klic RM-31 in Czech language). These are the most pleasant hand keys to use and they are extremely well made.
They were used as the part of different versions RM 31 troops radiosets with coded name Super Tana (1952) or in later conteiner's version of RM 31-M-s-p radiosets with coded name Trinec (1964) and in many others in 60's years of course.
It has adjustments for tension and contact spacing and it has a very nice feel to it.
The keying arm moves upward into a second position for receiving (if all appropriate contacts are used like in RM 31 - Super Tana transceiver version). There are labels on the front edge of the enclosure for the up or non-keying position "Prijem" (receive) and the down or keying position "Vysilani" (transmit). This version of the key is using 4 plugs where twins are used for TX and another twins for RX separately. The TX/RX switching (PTT) was managed simply by pulling up the fingertip frame of the key as it is shown on the picture below.
The key with the original lead and original 2 plugs (which fit 4mm connectors) was used for example with separate transmitter RS-41 in RM 31-M-a installation on Tatra T-805 vehicle.
The key is made from bakelite and olive green painted steel. The key measures 150 x 65 x 50 mm (5 1/8 " x 2 1/2" x 2"). Weight is 470g (1.03 lbs).
Text copyright © Petr, OK1RP