Product Overview
What it is: A hermetically sealed metal RF crystal filter module marked with NS logo, Part No. 726-062-003, and frequency marking 21.955-30 (interpreted as 21.955 MHz, likely dated 1980).
What it’s used for: Designed for intermediate frequency (IF) filtering in military communication systems, aviation radios, secure RF receivers, and defense electronics. Provides selective signal filtering centered at 21.955 MHz for stable channel performance.
