Product Overview
What it is: A hermetically sealed metal RF crystal filter module marked with NS logo, Part No. 726-062-001, and frequency marking 21.9955-3 (interpreted as 21.9955 MHz).
What it’s used for: Designed for intermediate frequency (IF) signal filtering in military communication systems, RF receivers, aviation radios, and secure communication equipment. Provides precise narrowband filtering centered at 21.9955 MHz.
