Technology VOR/ILS Analyzer User Manual

VOR/ILS Analyzer EVS200
0796.1800.02 E-8 40
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>
fa2 <CR>
With the command FA2 the ech
o
mode is automatically switche
d
OFF.
output form: (DDM <CR >, RF level <CR >,
AM90 <CR >, AM 150 <CR >)
DDM: four-digit with indication (dimensionless)
example
:
-1000 <CR > (-0.1000 DDM)
five-digit with indication (
µ
A)
example
:
-09890 <CR > (-98.90
µ
A)
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.
DSP-Analysis
DATA- Tr an sf er
DDM, AM90, AM150,
RF-Level - Calculation
RS232-
Transfer
TXD-Signal
from EVS200
40 msec. 10 msec.
DATA-Transfer
DDM, AM90, AM150,
RF-Level - Calculation
RS232-
Transfer
DATA-Transfer
N N+1 N+2 N+3 N+4 N+5 N+6 N+7 N+8 N+9 N+10
NN+4