Instrument Function > Modulation > DME Modulation > ID Settings for DME Reply Mode
ID Settings for DME Reply Mode

Access:

 

Select "Modulation > config... > DME > ID Settings".

The "DME ID" dialog contains the parameters for configuring the identification sequence for the reply signal. Each airport identifies itself with a three letter code, for example 'MUC' for the Munich airport. This information is transmitted in Morse code. The transmission of the identification sequence can be suppressed.

ID State - DME Modulation

("Reply Mode" only)

Switches on/off the generation of the identification sequence (ID signal) of the ground station. The ID signal consists of a series of pulse pairs transmitted at a rate of 1350 Hz.

The transmission of the ground signal is interrupted every 40 s (ID period) and one ID sequence is transmitted instead. The "key down time" of the ground signal corresponds to the period of transmission for a dot or dash in the Morse code ID sequence (e.g. 100 ms for a dot). During the key down times reply pulses are not transmitted, however, they are transmitted between the key down times.

Remote command: 
 
ID Code - DME Modulation

("Reply Mode" only)

Sets the coding of the ID signal by the international short name of the airport (e.g. MUC for the Munich airport). (ID signal).

The ID tone is sent according to the selected code (see Table "Morse code"). The length of the Morse code can be varied. For selection standard time scheme, the selected dot length determines the setting of all other length parameters of the Morse code (dash length, symbol space and letter space) . For selection user time scheme, all length parameters of the code can be set independently.

Morse code

Letter

Morse code

Letter

Morse code

A

. -

N

- .

B

- . . .

O

- - -

C

- . - .

P

. - - .

D

- . .

Q

- - . -

E

.

R

. - .

F

. . - .

S

. . .

G

- - .

T

-

H

. . . .

U

. . -

I

. .

V

. . . -

J

. - - -

W

. - -

K

- . -

X

- . . -

L

. - . .

Y

- . - -

M

- -

Z

- - . .

Note:

The following values are default values:
  • A dot (.) has a tone duration of 100 ms
  • A dash (-) has a tone duration of 300 ms
  • The time between two tones is 100 ms
  • The time between two letters is 300 ms

Example: 

ID code = MUC

The word length = 300+100+300+300+100+100+100+100+300+300+300+100+100+100+300+100+100 = 3100 ms

Remote command: 
 
ID Rate - DME Modulation

("Reply Mode" only)

Sets the pulse repetition rate of the ID sequence.

Remote command: 
 
ID Period - DME Modulation

("Reply Mode" only)

Sets the period of the ID sequence in seconds.

Remote command: 
 
ID Time Schema - DME Modulation

("Reply Mode" only)

Selects the mode to define the length parameters of the ID signal.

"Standard"

The set dot length determines the dash length (= three times the dot length).

"User"

Allows you to define all length parameters independently.

Remote command: 
 
ID Dot Length - DME Modulation

("Reply Mode" only)

Sets the length of a Morse dot in seconds. The length of the dash (3xdot), space (=dot) and letter space (=3xdot) is also determined by this entry if standard time scheme is selected.

Remote command: 
 
ID Dash Length - DME Modulation

("Reply Mode" and "User Time Scheme" only)

Sets the length of a Morse dash in seconds.

Remote command: 
 
ID Symbol Space - DME Modulation

(Reply mode and user time schema only)

Sets the length of a symbol space in seconds.

Remote command: 
 
ID Letter Space - DME Modulation

("Reply Mode" and "User Time Scheme" only)

Sets the length of a letter space in seconds.

Remote command: 
 
Set To Default ID - DME Modulation

Selects the default settings for the ID signal.

Remote command: 
 

 


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