Modes of operation
The TETRA MS Test option supports four different modes of operation – trans-
mitter measurements in asynchronous mode, T1 bit pattern generation and
paging sensitivity search function for receiver tests, measurements in call mode,
and the protocol trace.
Asynchronous measurements on the transmitter and receiver are useful when
the mobile is not in normal state but in a test mode. If you can make your mobile
under test transmit without a prior registration (location update) and a subsequent
call setup, or if you want to test the TETRA receiver by means of a T1 signal
transmitted by the STABILOCK, proceed with sections MEASURE and T1.
For measurements in normal mode, ie with location update (registration) and call
setup, the REGISTER section is most helpful to you.
For training purposes, or if you experience problems with a particular phone in
conjunction with the STABILOCK, it may be useful to have a look at the protocol
being exchanged between the STABILOCK and the unit under test. In this case,
you may want to proceed reading in the TRACE section.
MEASURE: Asynchronous transmitter measurements
In order to access the asynchronous transmitter measurements, the following
settings are required:
•
On the DEF.SET mask, the scroll field on the right hand side of the Channel
Offset field can be in either of two states: Sign.Trace or Measurements. Use
the
[UNIT/SCROLL]
key to switch to Measurements.
•
Still on the DEF.SET mask, select cw in the Measure scroll field if you want
to test a continuous signal, or select burst for a discontinuous signal.
•
Make sure other relevant parameters on the DEF.SET mask are set accord-
ingly: Channel 0 TX Frequency, Lower/Upper Band, Source, and Duplex
spacing.
Once that the settings are made, you can start the asynchronous measurements
by pushing the
{MEASURE}
key. The Measurements section explains in more detail
how to access different types of measurements (such as power, modulation and
frequency error, constellation and burst display) and how to interpret the results.
Measurements on a mobile station
The usual settings on a mobile station are: Lower Band, Source is RF, and burst
measurements. The duplex spacing for carriers around 800/900 MHz is typically
45 MHz, and 10 MHz (for European systems) or 8 MHz (for systems in Australia
and New Zealand), respectively, around 400 MHz.
10
Modes of operation TETRA MS Test
10-19
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