SDR-OMNI Avionics Test Set User Manual
Revision B 6 June 2023 Page 27
4.4.3 Screen Timeout
This option (3) sets the interval that the screen will be on in the absence of any touchscreen activity, except when
a test is in process (i.e., when the unit is transmitting or receiving, the screen will not turn off). Touching the
screen will reset the screen timeout counter. Selections are: 15 seconds, 30 seconds, 1 minute, 5 minutes, and
Never. If the screen times out, simply touching the screen will turn it back on.
4.4.4 Position Source
For ADS-B IN and OUT tests, the SDR-OMNI needs to have a valid GPS position. This can be obtained using
one of the three Position Source (4) options:
1. GPS: This selects the real time position determined by the internal SDR-OMNI GPS receiver (clear view of
sky is required). This is best selected if the unit is to be used outside on a tarmac or in a hangar with a GPS
repeater.
2. Saved: A previously saved position. This is recommended if the unit is to be used in a hangar with no GPS
repeater.
First, select GPS as the position source, then take the unit outdoors for several minutes until it gets a GPS
position fix (indicated when the Update button in the Saved Position row becomes active).
Press the Update button to save that position, then select Saved for the Position Source. The unit will now
use this saved position when testing ADS-B devices.
3. Manual: A manually entered position, with Lat and Lon entered in decimal degrees. This allows for any valid
Lat/Lon to be entered, and is recommended for lab testing, or anytime a real-time GPS position would be
difficult to acquire.
When Manual is selected, Manual Position Lat/Lon entry boxes (5) are displayed. The left box is Latitude
(South is negative) and the right box is Longitude (West is negative).
4.4.5 Distance Units
This option (6) allows the user to select Feet or Meters for cable length, antenna distance to UUT, and altitude
data.
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