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Section 2 Questions: Testing mobile and base station
transmitters
Q2.1: How do I use the 2968 to control the mobile to transmit at
a particular power level?
Q2.2: Why is the mobile power level approximately 5 dB too high
or too low?
Q2.3: Can I use the 2968 to control the mobile power directly, as
with GSM?
Q2.4: How do I ensure a repeatable method for testing mobiles
on a particular power level?
Q2.5: Can I test the mobile's transmitter on different frequen-
cies?
Q2.6: Can I test the mobile's transmitter over its entire receive/
transmit frequency range?
Q2.7: Why do the TETRA mobile transmitter measurements stop
after about a minute?
Q2.8: Why does my TETRA mobile or base station exhibit exces-
sive vector error?
Q2.9: Can the 2968 measure Adjacent Channel Power (ACP)?
Q2.10: Can the 2968 power measurement compensate for cable
loss, attenuators, splitters?
Q2.11: Why does the power reading show a reverse video aster-
isk next to it?
Q2.12: Can the IFR 2968 measure directional ("through-line")
power?
Section 3 Questions: Testing mobile and base station
receivers
Q3.1: Can the IFR 2968 test the receiver sensitivity of TETRA
mobiles?
Q3.2: How do I measure receiver sensitivity using 'TT' RF
Loopback?
Q3.3: Why does the mobile drop the call while measuring receiv-
er sensitivity?
Q3.4: Why doesn't 'TT' RF Loopback work with my mobile?
Q3.5: How do I test receiver sensitivity if a mobile does not sup-
port TT RF Loopback?
Q3.6: What is the difference between 'TT' test mode and 'T1' test
mode?
Q3.7: How do I access T1 test mode in the mobile under test?
Q3.8: How do I test the mobile receiver if I have no access to TT
loopback or T1 test mode?
Q3.9: What is the difference between MER, BER and RBER?
Q3.10: Which types of T1 test signals are generated for MS test-
ing?
Q3.11: What is the content of the PRBS information generated by
the IFR 2968 T1 signals?
Q3.12: Can the 2968 generate PRBS for testing AACH, BSCH and
SCH/HD channel types?
Q3.13: Can the IFR 2968 test base station receivers?
Q3.14: What is the synchronisation connection between the base
station and the IFR 2968?
Q3.15: How do I perform a test on a base station receiver with
the IFR 2968?
Q3.16: What is the purpose of "SYNC PULSE OFFSET" and
"AUTO SYNC PATH DELAY"?
Q3.17: Why does the base station indicate a BER measurement
of around 50%?
Q3.18: Can the 2968 signal generator compensate for cable loss,
attenuators, splitters etc.?
Q3.19: Why does the signal generator level setting show a
reverse video asterisk next to it?
Q3.20: Can I use the 2968 to test receiver selectivity?
Q3.21: Can the IFR 2968 be used for dynamic (fading) sensitivity
tests?
Section 4 Questions: Testing the audio performance
of TETRA mobiles
Q4.1: Can I perform audio testing whilst the IFR 2968 is in TETRA
mode?
Q4.2: Can I use an external audio source to modulate the 2968
TETRA signal?
Q4.3: How can I test the mobile's audio circuitry with the 2968?
Q4.4: What is the IFR 2968 generating when it is set to 'test
tone'?
Q4.5: Can I use the 2968 TETRA test tone for audio SINAD
measurements?
Q4.6: Can I use the 2968 to test audio at frequencies other than
1 kHz?
Section 5 Questions: Functional testing of TETRA
mobiles
Q5.1: Can the IFR 2968 test text messaging, as with SMS text
messages in GSM?
Q5.2: Can the IFR 2968 support 16-bit UCS2 and Cyrillic text
messages?
Q5.3: What is the 'commanded registration' function used for?
Q5.4: What is the 'TT test confirm' function used for?
Q5.5: What is the SYSTEM SET-UP: MOBILE PARAMETERS menu
used for?
Q5.6: Does the IFR 2968 test DGNA (Dynamic Group Number
Assignment)?
Q5.7: Does the IFR 2968 test TETRA Packet Data?
Q5.8: Why has transmission trunking behaviour changed in the
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