Product Description
The Frequency meter CKB-74028 is a part of the American Navy test equipment LM-20
“Unit is sold "as is" for refurbishment or parts. Great for project because everything look good inside and out no noticeable water damage all parts are there unit is in good shape all dials and switches work, when attached to power operating light did come on when switched.

This equipment provides a simple and reliable frequency indicating source between 125 kc and 20 mc for frequency setting and measurement of receivers, transmitters, signal generators, or any electronic devices where the frequency must be known. It is a heterodyne type of unit having a variable oscillator which may be point-checked against an internal crystal oscillator and its harmonics at frequent settings. An external signal may be mixed with the variable oscillator output by a wire or antenna connection to a binding post.
Here is a link to specs and other nerd stuff
https://www.pa3esy.nl/military/us/meet/LM20/html/lm20-gb_set.ht

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