Instrument Function > Modulation > ADF Modulation > ADF Modulation Menu
ADF Modulation Menu

The "ADF Modulation" menu is opened in the "Mod" function block or using the MENU key under Mod.

In the upper section of the menu, the modulation source is selected and the modulation switched on. The configuration of the communication/identification signal is performed in the lower section of the menu.

State - ADF Modulation

Activates/deactivates ADF modulation. A unmodulated carrier with a frequency of 190 kHz (default) is generated. After switching on the COM/ID tone the carrier is modulated with 95 percent AM depth at a 1,02 kHz modulation rate.

Activation of ADF modulation deactivates AM, VOR, ILS and Marker Beacon modulation.

Source selection is disabled in the "LF Output" menu:

Remote command: 
 
COM/ID(A0/A2) State - ADF Modulation

Switches on/off the communication/identification signal (COM/ID signal). The COM/ID tone is modulated onto the carrier (A0/A2 transmission).

Remote command: 
 
Show Details - ADF Modulation

Reveals the detailed setting options for the COM/Id signal. Once the details are revealed, the labeling on the button changes to "Hide Details". Use this to hide the detailed setting options display again. (COM/ID signal).

Remote command: 

n.a.

 
COM/ID(A0/A2) Code - ADF Modulation

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

The COM/ID tone is sent according to the selected code (see table of Morse below).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.

The COM/ID tone is modulated onto the carrier (A0/A2 transmission).

If no coding is entered, the COM/ID tone is sent uncoded (key down).

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 300ms
  • The time between two tones is 100ms
  • The time between two letters is 300ms
After each word a word space is entered. The word repetition rate is 7 words/minute. As the word length can vary between 900 ms and 4500 ms the word space between the words varies accordingly.

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: 
 
COM/ID(A0/A2) Frequency - ADF Modulation

Enters the frequency of the COM/ID signals.

The COM/ID tone is modulated onto the carrier (A0/A2 transmission).

Remote command: 
 
COM/ID(A0/A2) Period - ADF Modulation

Enters the period of the COM/ID signal in seconds.

Remote command: 
 
COM/ID(A0/A2) Depth - ADF Modulation

Enters the AM modulation depth of the COM/ID signal.

The COM/ID tone is modulated onto the carrier (A0/A2 transmission).

Remote command: 
 
COM/ID(A0/A2) Time Schema - ADF Modulation

Selects if the set dot length determines the dash length (= three times the dot length) (setting Standard) or if all length parameters can be set independently (setting User). (COM/ID signal).

Remote command: 
 
COM/ID(A0/A2) Dot Length - ADF Modulation

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

Remote command: 
 
COM/ID(A0/A2) Dash Length - ADF Modulation

(user time schema only)

Enters the length of a Morse dash by means of seconds.

Remote command: 
 
COM/ID(A0/A2) Symbol Space - ADF Modulation

(user time schema only)

Enters the length of a symbol space by means of seconds.

Remote command: 
 
COM/ID(A0/A2) Letter Space - ADF Modulation

(user time schema only)

Enters the length of a letter space by means of seconds.

Remote command: 
 

 


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