EK07 was in use by the military (dark green painted version),
in the embassys (with telegraph decoder unit),
for listening something of the cold war
for listening the see + ships communication,
by the state, post, as control receiver
and some other..
'There is not only the large drum, it is full of engineering.
I have not opened the behind side of the rotary switch, in each of the 4 areas is a section of the rotating capacitor what makes the tuning.
Each of them is full of little screws, I am not shure but think there are 32 pcs in each of the 4, to adjust the linearity of that apparatus. Of coarse silver plated, like the most parts in the radio.
Some parts of the system are in seperate cases, and some of them are very special. So the control oscillator is housed in a brutal massive metal case, hermetically closed and equipped with a drying patrone.
The stability is only some Hz in a hour, there is no drifting when the radio is warmed up (what can be 30 minutes or more
) So the big radio can listen for a long time side band talks without any correction at the wheels.
It is full of selected parts to have a enorm temperature stability, the instrument right hand is calibrated to show µV directly.
The IF stage is made to grow <3dB when a signal of 0.7µV grows to 100mV, means a regulating area of > 10 up 5
A strong signal directly from the neighbourship will not overrun this amazing amplifiers. The bandwith is switchable from 150Hz in steps up to 12kHz. at 12kHz it sounds great for music.
It is a grandmaster of old engineering, only the best, made without saving money. So it was not possible to normal people to buy one..
There are extensions from R+S:
a nixie frequency counter unit,
a telegraph decoder unit
a SSB decoder unit
a full remote to use the radio by the phone from long distance.
When you see one anywhere get it, they are rare and still bad expensive.
greetings
Martin
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