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FS2004 ATIS Frequency range

Real world airports sometimes have ATIS below 118.000 MHz
(FYWH Windhoek, Namibia: 114.5MHz)

ADE does not accept these values, because comm radios of fs9 cannot be tuned to these values, I suppose(?).

If I use AFCAD2, I can insert these values. They are displayed in
"world - map" and in the GPS window without any function...


is this a restriction of fs9 or of real radio transceivers?


Staff member
FSDevConf team
Resource contributor
If you try setting a Com Frequency below 118 then the Bgl Compiler throws an error and will not compile:

ERROR: COM over NAV Frequency 114.100000 does not have a matching COM Frequency.
Since AFCAD uses its own compiler that does not conform to the MS one it will compile those values. FS may well accept it in game as you have found....
thanks Jon,

so it is a fs9 (FSX also?) restriction.

I have read the bglcomp SDK, but I couldt not find a range of frequencies...

I am sure we can find a way to live with it ...



Staff member
FSDevConf team
Resource contributor
Not sure Guenther. I suspect it is the same in FSX but I checked only the FS9 compiler.


Resource contributor
Just to make clear - it is also restriction of real transceivers. Radio frequencies are divided into certain frequency bands that suits the purpose best and because airplanes are mostly up somewhere, it's perfectly fine to use high frequencies that require almost line of sight contact for a good signal.

For civil aviation allocated frequency band is 108.000 MHz to 136.999 MHz and it is further divided into NAV frequencies from 108.000 to 117.999MHz and COM frequencies from 118.000 up to already mentioned 136.999MHz.

Not only the Namibian airport you mentioned, there are also many other airports that use capability of a VOR station to also transmit on a voice channel(it is always used as source of the morse identifier code anyway) and NAV receivers on aircraft are capable of receiving both voice and navigation signals, so this capability is used to transmit additional information in form of ATIS. Unfortunately Microsoft forgot about this fact and strives us in our quest for realism with this limitation. The best you can do to have ATIS on this location is to pair it with one of the COM frequencies. Unrealistic, but, at least you'll have it.
ATIS Distatance

Does anyone know, Can we adjust the distance for Clear ATIS reception?
Right now, at 7,000' at 60 nm, is when I pick up ATIS. Can I change this in Prepar3d OR ADE?

Thank you!