syntonize

from The Century Dictionary.

• To adjust to syntonism; render syntonic. See syntonism.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb (Physics) To adjust or devise so as to emit or respond to electric oscillations of a certain wave length; to tune; specif., to put (two or more instruments or systems of wireless telegraphy) in syntony with each other.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb electronics To adjust two electronic circuits or devices to operate on the same frequency.