Why most Towers have 118.1 and most Grounds 121.9 as freq?

Question

Seems it's some kind of standard, at least for large airports?

Answer 1

You're wrong about the tower freq. How many airports have you flown into? I can tell you off the top of my head that San Francisco Tower is 120.5. Some large airports have multiple tower frequencies. In any event, it is incorrect to say that "most towers have 118.1". (Go to AirNav.com and look up some tower frequencies.) Ground is usually 121.7 or 121.9, but it can be something else, especially if there are numerous controlled airports in the vicinity. Burbank, for example, is 123.9

Answer 2

Thought ground's usually point seven. Oh well. You can't see the reason. Kinda obvious. I know the tower and ground frequencies of most of the airports in the world without having to look it up and remember it. Get it now?

Answer 3

Sort of, but not when airports are very near each other.

Answer 4

You are incorrect.

Answer 5

for a better signal

Answer 6

I don't know if tower is mostly 118.1, especially at large airports.  Most large airports operate a seperate tower frequency for each runway, therefore there'd be 4-6 different tower freq's.  Ground almost everywhere begins with 121.?  Often time when exiting the runway they will say contact ground point whatever.