[…] one of these birds came wheeling and screaming round his head in a maze of untrackably swift circlings.

A digitally controlled crystal oscillator (DCXO) generates a high-quality basestation-synchronized frequency reference such that the transmitted carrier frequencies and the received symbol rates are accurate to within 0.1 ppm.

I jumped at the position as soon as it was offered.

These gunny-sack chaps are not animals or savages. Look, Henry! They are semaphoring! See that tree there, and that big one across the cañon. Watch the branches wave.