User's Manual

Table 1-5 DME Channel Frequency Allocation

ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO

DME

Channel

LOC

(MHz)

VOR

(MHz)

Freq

(MHz)

Pulse Code

µs

Freq

(MHz)

Pulse Code

µs

Freq

(MHz)

126X - - 117.9 1150 12 1213 12 1025

126Y - - 117.95 1150 36 1087 30 1025

1.7.6 System Checkout

a. Bypass the Integral monitor and select Tx1 Main.

b. For dual equipment bypass the Standby monitor and select Tx2 Load.

c. If the DME station has an alarm condition, then refer to section Error! Reference source not found.

to perform fault isolation and corrective maintenance.

d. Perform section Error! Reference source not found. Error! Reference source not found.

procedure.

e. Perform section Error! Reference source not found. Error! Reference source not found.

procedure.

f. Perform section Error! Reference source not found. Error! Reference source not found.

procedure.

g. Perform the SELEX-SI Site Acceptance Test (SAT) Procedure for the 2160/2170 DME system. Note

if this procedure is not available then perform all remaining performance checks in section Error!

Reference source not found. of this manual.

h. Save the final DME configuration to disk using the System >> Configuration Save command from the

PMDT. It is recommended that a backup copy of the station configuration also be maintained off site.

1.7.7Performance Tuning During Flight Inspection

a. If the DME is not able to achieve usable distance then refer to section Error! Reference source not

found. Error! Reference source not found. to adjust the receiver threshold.

b. If flight inspection reports an unlock condition or a range error while on a radial approach then refer to

section Error! Reference source not found. Error! Reference source not found. to configure echo

suppression.

c. If changes to the station are made during flight inspection then create a new station configuration file

using the System >> Configuration Save command from the PMDT.