Radio technology · Question 45 of 65
Which channel spacing (frequency band 117.975 MHz – 137.000 MHz) is operated in the aeronautical mobile service in lower airspace?
1 answer is correct. Hard Official question catalogue
Show answer
Answer
- A 25 kHz + 8.33 kHz
Explanation
In the lower airspace, channels with 25 kHz and 8.33 kHz spacing are in use. The narrower 8.33 kHz channels provide more frequencies in the crowded aeronautical band; spacings in MHz would be far too wide.