User's Manual

Model 1150A DVOR
Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
6-5
f. V
erify that the modulation is within the tolerance of Table 4-1(d)(4).
g. Measure the Ident frequency and verify it is within the tolerance of Table 4-1(c)(5).
h. Turn on transmitter 2 by pointing and clicking the Tx 2 antenna button.
i. Connect oscilloscope probe to Transmitter 2 Carrier Amplifier 1A5A4-P2.
j. Measure the high and low peak voltages and calculate the modulation by the following relation:
Emax - Emin
% Ident Modulation = ----------------------
Emax + Emin
k. Verify that the modulation is within the tolerance of Table 4-1(d)(4).
l. Measure the Ident frequency and verify it is within the tolerance of Table 4-1(c)(5).
m. Adjust Transmitters>> Configuration>> Reference and Voice Modulation to the previous settings.
n. Select Transmitters>> Commands>> VOR Ident>> Normal.
o. On the Monitors>> Data>> Integral screen, verify that the Ident is NORMAL.
6.3
EQUIPMENT INSPECTION PROCEDURES
6.3.1 Site Inspection
a. Check that the site is clear of any new obstructions or materials which could affect the normal operation of
the DVOR system.
b. Check the shelter, inside and out, for any sign of water filtration, damage, or other deterioration.
c. Check the condition of the air conditioner, shelter lighting, obstruction lights, baseboard heaters, electrical
outlets, lightening arrestors, etc.
d. Check for and remove any debris, accumulation of snow (over 4 inches, 10 cm), or ice (over 0.5 inches, 1.5
cm), on the field monitor antennas.
e. Check for and remove any accumulation of debris or snow (over 1 foot, 30 cm) on the counterpoise
surface.
6.3.2
Inspection of Transmission Antennas
a. Insure that both DVOR transmitters are turned off.
b. The DVOR antennas are contained within fiberglass radomes.
c. Inspect the mating areas of the radomes where the radome interfaces with the radome base or where the
radome interfaces with the antennas. Check for any signs of water leakage or deterioration. Repair or
replace as necessary.
d. If the radome shows water leakage, remove the radome and inspect the antenna for any signs of
deterioration of water damage. Replace or repair the radome as necessary. Check the input cables and
connectors for breaks, cracks or corrosion. Check that the connectors are securely fastened, and inspect the
remaining parts of the antenna for damage or signs of vermin infestation.
e. Inspect the counterpoise for any signs of deterioration, paying special attention to the welded joints, bolted
connections, mesh, etc. Check for proper electrical connection between the counterpoise segments and
grounding connections. Corrosion should be corrected by removing rust and applying paint or cold
galvanizing spray.
f. Remove any articles carried into the radome area and replace the antenna radome covers.
6.3.3
Inspection of the Field Monitor Antenna
a. Inspect the condition of the field monitor antenna. Make sure it is solidly mounted, and that all nuts and
bolts are tightened.
b. Check the ground wire connection to earth ground, tighten connections if necessary.
c. Inspect the condition of the field monitor antenna coaxial cables for signs of cracks or breakage. Replace if
necessary.