Viavi T-BERD 5800 Parts list manual

VIAVI Solutions
Quick Card
T-BERD®/MTS-5800 Network Tester
GNSS Reception Test
This document outlines how to use T-BERD/MTS 5800 instrument to perform GNSS reception testing
for GNSS antenna installation, verification or troubleshooting.
Equipment Requirements:
•One of the following T-BERD/MTS 5800 mainframe
configurations:
T-BERD/MTS-5800-100G (TB/MTS-5800-100G)
BERT software release V27.2 or greater
GNSS test option (C5GNSS)
GNSS Antenna (C5TEM-ANTENNA)
Figure 1: T-BERD 5800-100G
T-BERD/MTS-5882 (TB/MTS-5882)
BERT software release V27.2 or greater
C5GNSS test option
GNSS Antenna (C5TEM-ANTENNA)
Figure 2: T-BERD 5882
T-BERD/MTS 5800v2 (TB/MTS-5811P or
TB/MTS-5822P)
BERT software release V27.2 or greater
GNSS test option (C5GNSS)
Timing Expansion Module with Rubidium Oscillator
(C5TEM)
GNSS Antenna (C5TEM-ANTENNA)
Figure 3: T-BERD 5800v2 w/ TEM
T-BERD/MTS Placement and GNSS Antenna Connection:
•If you are testing GNSS reception to scout for optimal location for permanent GNSS antenna installation:
Connect portable GNSS antenna (C5TEM-ANTENNA) to the antenna receptacle on the T-BERD/MTS-
5800-100G or T-BERD/MTS-5882 mainframe or to antenna receptacle on the TEM module.
Place T-BERD/MTS unit in potential location where permanent GNSS antenna may be installed (e.g. roof-
top, etc.) and ensure the antenna has clear unobstructed view of the sky.
•If you are testing GNSS reception of a permanent GNSS antenna installation:
Connect permanent GNSS antenna to the antenna receptacle on T-BERD/MTS-5800-100G or
T-BERD/MTS-5882 mainframe or to the antenna receptacle on TEM module. A coax connector adapter
may be required.

VIAVI Solutions
Configure GNSS Reception Test:
1. Press the Power button to turn on the
T-BERD/MTS instrument.
2. Tap on the Timing Source tab at the top of the
screen to launch the internal GNSS receiver or
TEM module GNSS receiver. Once the GNSS
receiver application is running, tap on the
Setup button to configure the GNSS
parameters.
Figure 4: Launch Screen
3. On the GNSS parameters tab select the
appropriate GNSS constellation for your
geographical area. For North America select
GPS system.
4. If using T-BERD/MTS portable antenna set the
Antenna Power to 3.3 Volts. If testing with
permanent antenna select the appropriate
voltage for it and specify the correct Antenna
Time Bias to compensate for antenna cable
delay. Typical antenna cables add
approximately 1.2ns of delay per foot. Leave
all other parameters at defaults.
5. Tap on the Results button to move to the
Results screen.
Figure 5: Setup
Run GNSS Reception Test:
1. Tap on the Start Survey button and select
Fast survey mode to start the GNSS
reception test.
Figure 6: Start Survey

VIAVI Solutions
Contact Us +1 844 GO VIAVI)
([phone])
To reach the VIAVI office nearest you,
visit viavisolutions.com/contacts.
© 2019 VIAVI Solutions Inc.
Product specifications and descriptions in this
document are subject to change without notice.
2. Wait approximately 15 minutes for the
satellite survey to complete, which will be
indicated by the Summary->Status results
view turning green and GNSS receiver
obtaining position lock on the GNSS -> Status
results view.
Figure 7: GNSS Status Results
3. Use the Satellites -> Sky Plot, Satellites ->
Signal Strength and other results views to
obtain an initial assessment of GNSS
reception quality. Note that GNSS CNO
(carrier to noise ratio) acceptable range is
35-45 dB-Hz with maximum of 50 dB-Hz.
4. If scouting for permanent antenna location
installation and the GNSS reception is
inadequate or CNO is too low, move the
T-BERD/MTS to a different location and
repeat Steps 1 thru 3 until a location with
adequate GNSS reception is found.
5. If validating permanent antenna installation
and the GNSS reception is inadequate or
CNO is too low, proceed to antenna and/or
cable troubleshooting.
Figure 8: Satellites Sky Plot Results
6. Once the initial GNSS reception quality
assessment is positive in location being
tested, leave the reception test running for
24 hours to track GNSS satellite reception in
this location for two full orbital periods.
7. Monitor and analyze the Satellites -> CNO
Map Spectrogram results view for details on
GNSS reception quality in this location
throughout the test duration.
Figure 9: GNSS Location and Satellites CNO Map Spectrogram results
8. At the end of the test tap on Reports button in bottom left screen corner and select Create Report
option to save the GNSS Reception Test results in this location.