Instrument Function > Modulation > Marker Beacon Modulation > Marker Beacon Modulation Settings
Marker Beacon Modulation Settings

Access:

 

Select "Modulation > config... > MKR-BCN".

The "MKR-BCN Modulation" dialog contains the parameters for configuration of the marker, and the COM/ID settings for the modulation.

State - Marker Beacon Modulation

Activates the marker beacon modulation.

Note: MKR-BCN modulation automatically deactivates the modulations AM, VOR, ILS-GS, ILS-LOC and ADF. In addition, the R&S SMA allocates the internal LF generator firmly to the MKR-BCN modulation, and disables the selection of the LF generator "Source" in the "LF Generator / Output" dialog.

Remote command: 
 
Marker Frequency - Marker Beacon Modulation

Selects the modulation frequency of the marker signal.

The modulation operates with the frequencies: 400 Hz, 1300 Hz or 3000 Hz.

Remote command: 
 
Marker Depth - Marker Beacon Modulation

Sets the modulation depth of the marker signal.

Remote command: 
 
Pulsed Marker - Marker Beacon Modulation

Activates the pulsed marker.

If activated, the R&S SMA provides three markers at the output, with the on/off times shown in Table "On/Off time overview of the pulsed markers":

On/Off time overview of the pulsed markers
 

On

Off

Outer Marker (400 Hz)

375 ms

125 ms

Middle Marker (1300 Hz)

375 ms

83 ms

125 ms

83 ms

Inner Marker (3000 Hz)

83 ms

83 ms

(6 dots/sec)

If deactivated, the R&S SMA provides uncoded markers at the output (key down).

Remote command: 
 
COM/ID State - Marker Beacon Modulation

Activates an additional communication and identification signal (COM/ID signal).

Remote command: 
 
Show Details - Marker Beacon 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 function to hide the detailed setting options display again.

Remote command: 

n.a.

 
COM/ID Code - Marker Beacon Modulation

Sets 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.

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 300 ms
  • The time between two tones is 100 ms
  • The time between two letters is 300 ms
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 Frequency - Marker Beacon Modulation

Sets the frequency of the COM/ID signals.

Remote command: 
 
COM/ID Period - Marker Beacon Modulation

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

Remote command: 
 
COM/ID Depth - Marker Beacon Modulation

Sets the AM modulation depth of the COM/ID signal. The sum of subcarrier depth, VAR depth and COM/ID depth must be smaller than 100 PCT.

Remote command: 
 
COM/ID Time Schema - Marker Beacon 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 Dot Length - Marker Beacon Modulation

Sets 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 Dash Length - Marker Beacon Modulation

(user time schema only)

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

Remote command: 
 
COM/ID Symbol Space - Marker Beacon Modulation

(user time schema only)

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

Remote command: 
 
COM/ID Letter Space - Marker Beacon Modulation

(user time schema only)

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

Remote command: 
 
Carrier Freq. Knob Step - Marker Beacon Modulation

Selects the variation of the carrier frequency via the rotary knob.

"Decimal"

Decimal variation according to the current cursor position.

An RF frequency of 75 MHz is automatically set when marker beacon modulation is switched on.

"Defined"

Variation in predefined steps according to the standardized Marker Beacon transmitting frequencies (see table, values in MHz)

Note: If "Defined" is selected, the current RF frequency is automatically switched over to the next Marker Beacon transmitting frequency acc. to the table when switching on the modulation.

Standardized Marker beacon transmitting frequencies (MHz)

74.600

75.675

74.750

74.825

74.900

74.975

75.050

75.125

75.200

75.275

75.350

74.625

74.700

74.775

74.850

74.925

75.000

75.075

75.150

75.225

75.300

75.375

74.650

74.725

74.800

74.875

74.950

75.025

75.100

75.175

75.250

75.325

75.400

Remote command: 

n.a.

 
Set To Default - Marker Beacon Modulation

Activates the Marker Beacon default setting. The RF frequency is set to 75 MHz.

Parameter

Value

State

Off

Marker Frequency

400 Hz

Marker Depth

95 %

Pulsed Marker

Off

COM/ID State

Off

COM/ID Frequency

1020 kHz

COM/ID Period

9 s

COM/ID Depth

10 percent

RF Frequency

75 MHz

Remote command: 
 

 


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