Procom EVS200 user manual Command FA2 Function, Modulation depth

VOR/ILS Analyzer EVS200

		Chapter 3: Operation
Command FA2
command	function
FA2 <Fast DDM measuring on>	Activating the Fast DDM measurement

The command FA2 switches on the fast DDM measurement. The measuring, used only for landing path measurement can only be activated through a controller.

The command FA2 performs the continuous measurement and output of the DDM, RF level, Mod- factor 90 Hz and Modfactor 150 Hz with a transmission speed of about 20 measurement value sets (DDM, RF level, AM90, AM150) per second. This conforms to a time interval of 50 ms. The stated RS-232-transmission times are related to 19.200 Baud.

The measurement values can be read in and output as a text file corresponding to the terminal pro- gram.

To reach 20 meas/s the baud rate must be set to 19200 baud in the Setup of the

VOR/ILS Analyzer EVS200. It must be attended the acceptance of the data transfering rate by the terminal program.

￿The measurement can be stopped through the command FA0 (refer to Command

FA0).

Example:	command from the controller	response of the VOR/ILS Analyzer EVS200
input:	FA2 <CR>	output form: (DDM <CR >, RF level <CR >,
	fa2 <CR>	AM90 <CR >, AM 150 <CR >)
	With the command FA2 the echo
	mode is automatically switched	DDM: four-digit with indication (dimensionless)
	OFF.	example: -1000 <CR > (-0.1000 DDM)
		five-digit with indication (μA)
		example: -09890 <CR > (-98.90 μA )
		RF level: three-digit with indication (dBm)
		example: -400 <CR > (-40.0dBm)
			122 <CR > (12.2dBm)
		Modulation depth:	three-digit (%)
		example:	202 <CR > (20.2 %)
			004 <CR > (0.4 %)

1/90Hz = 11.1msec.

N

N+1

N+2

N+3

N+4

N+5

N+6

N+7

N+8

N+9

N+10

DSP-Analysis

DATA-Transfer

DDM, AM90, AM150,

RS232-

DATA-Transfer

DDM, AM90, AM150,

RS232-

DATA-

RF-Level - Calculation

Transfer

RF-Level - Calculation

Transfer

TXD-Signal

N

N+4

fromEVS200

40 msec.

10 msec.

0796.1800.02 E-8 40