It’s been so long ago. When I left the Navy I left it all behind me but brings back fond memories in my senior years. I used the KW-37 many times encrypting and decrypting call signs. I never mentioned the KW-37 for decades then it was on news one night about how the Walker family had sold it to the Soviets before I was even in the Navy. They had that machine that encrypted and decrypted our most secret communications, but they also needed more info to use it and that info changed constantly and randomly. The KW-37 itself was only one part of the key. They never had the ability to read our classified info in real time.
I spent hours practicing on a CW simulator, don’t remember the official Navy name for it.
In setting up the old “model t” transmitters you had to have a frequency meter. You set the freq meter dead on the frequency and tuned the transmitter to match it, lots of peaking and dipping of needles on guages, over and over until it was at a “zero beat”, meaning the transmitter was dead on frequency. It took lots of time to set all the transmitters up for an operation, and they constantly drifted off frequncy due to temperature, humidity, and vibration, so the transmitter man (me) was constantly on call. The old “T” models looked like something out of an old Frankenstein movie with their gigantic vacume tubes pulsating and glowing.
We had a few newer ones that you just dialed in the frequency and went to operating the CW circuit. They took all the fun out of it.