User Manual SDR-OMNI Avionics Test Set
Page 84 6 June 2023 Revision B
c. Enter Cable Loss, which is marked on TIC supplied cables. If other coaxial RF adapters need to be
used, an additional 1 dB loss for each adapter should be added to this field.
d. If using the TAP-OMNI antenna coupler over the DME antenna, select this checkbox.
3. If testing the DME system over-the-air, there are two options.
a. Use the TAP-OMNI coupler: Identify the DME antenna and clamp the coupler to it. In this case, select
the Direct (T/R) port as in step 2 above, and select the Using Coupler check box. The unit then
shows the additional 0.9 dB loss of the TAP-OMNI coupler.
b. Use the L-Band Directional Antenna: Attach the antenna to the ANT-A port. From the DME Setup
screen, select Antenna A port. Then enter the estimated Antenna Distance to UUT. If an extension
coaxial cable has been inserted between the SDR-OMNI connector and the L-Band Directional
Antenna, select Using Antenna Cable and enter the Cable Length.
4. Once the setup has been entered, select Close. The single DME Test screen will be displayed (Figure 5-34
and Table 5-10). All user controllable Setup parameters in are in lower portion of the screen. The center
section of the screen displays all the measured parameters of the DME reply. The upper Range and Velocity
section allows for quick entry of a new range and velocity, and displays the simulated range and velocity
during testing.
5. Now select the DME to be tested by entering the associated VORTAC frequency (108.00 to 117.95 MHz) in
the lower Setup section of the DME Test screen.
To Next Page
Loading...
