Hi,

Operating frequency switch, of the SNR.

It has 3 settings.
down - Lambda-I, frequency no.1 (It is the default [peacetime] setting, the cover used to be sealed.)
middle - Lambda-II, frequency no.2 (It is the wartime setting, can be switched only when the seal is broken.)
up - AVT., automatic frequency change between no.1 and no.2, in random time, to confuse jammers.

At the right side of the desk, there is two green lamps, indicating the current frequency.

Br,
Hpasp


Hpasp
Free SAM Simulator, "Realistic to the Switch"

(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
http://sites.google.com/site/samsimulator1972/home

Book from the author - Soviet Nuclear Weapons in Hungary 1961-1991
https://sites.google.com/view/nuclear-weapons-in-hungary/

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