190-01553-00
GTR 200 Installation Manual
Rev. B
Page B-3
B.2.1.1.2 Legacy Frequency Type Enumeration
0
Tower
1
Ground
2
Automatic Terminal Information Service or ATIS
3
Air Traffic Frequency
4
Approach
5
Arrival
6
Automatic Weather Observing Station
7
Clearance/Delivery
8
Common Traffic Advisory Frequency
9
Departure
:
Flight Service Station
;
Remote Flight Service Station
<
Unicom
=
Mandatory Frequency
>
No type specified
?
Undefined
B.2.2 Input Messages
B.2.2.1 Set Active Frequency and Transceiver Function
This message is used to set the Active frequency as well as the transceiver function.
Message format (GTR 200):
“GRM”.............Company identifier.
“C” ...................Message class.
“15”..................Message identifier.
mk ....................Active frequency: m = MHz, where m = desired MHz frequency - 30h, ranging
from 118 to 136 MHz, (i.e. 76h to 88h, A2h); k = (KHz offset / 25KHz) + 30h,
ranging from 000 to 975KHz in 25 KHz steps.
a .......................Transceiver function: N = normal, M = monitor, 0 = unchanged.
“0”....................8.33 KHz offset: (ASCII) 0 = 25 KHz frequency (.000)
iiii.....................Identifier string. Note that if the identifier string is less than four characters, left
justify the string and insert spaces for empty characters. An empty identifier
string (four spaces) is allowed. Identifiers are restricted to using ASCII characters
0-9 and A-Z.
f........................Frequency type (see Extended Frequency Type Enumeration).
Example message:
$PGRMC15W=N0KIXDA<chksm><CR><LF>
This example command would set the active COM frequency to 135.325 MHz with an identifier of “KIXD
ASOS”, and place the radio in Normal receive mode. This is interpreted by noting that the ASCII ‘W’
corresponds with 57h, +30h = 87h, converted to decimal equals 135 for the MHz portion. The KHz
portion converts ASCII ‘=’ to 3Dh, -30h yields Dh, x25KHz steps = 325 KHz, with no 8.33 KHz channel
offsets. The identifier string portion is “KIXD” and the frequency type ‘A’ corresponds to “Automated
Surface Observing Station” in the extended frequency type enumeration.
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