Assertion: radio wave's frequency | /r/HasProperty | passed
Facets:
Source sentences:
text: Generally, the lower the frequency to be passed the larger the waveguide is.
text: Radio control systems of this era were generally electromechanical in nature, using small metal "fingers" or "reeds" with different resonant frequencies each of which would operate one of a number of different relays when a particular frequency was received.