Freedom R8100 SERIES, Operator'S Manual

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provides a quick end–to-end test of the radio transmitter and receiver. Voice Loopback can also be used
to quickly verify basic functionality of an encrypted message.
Note: The power Input Level of the received message is readjusted to maintain the power Output Level
of the transmitted message.
Off – Stops a recording or playback and disables the feature; the progress bar is grayed out. The last
recording is preserved for the remainder of the session; it is lost if the R8100 is power cycled.
Record – (Monitor mode only) Disable the automatic switch to Generate mode and subsequent playback.
The last recording is automatically erased when a new input message is detected.
Play – (Generate mode only) The last recorded message is repeatedly played and rewound; speech
recorded from a transmitting radio under test should be heard from its receiver if the radio is operating
properly. This setting disables the automatic switch to Monitor mode and subsequent recording. See
Figure 3.2.8.3.2-2.
Record & Play – Automatically switch from Monitor mode to Generate mode to play a recording and from
Generate mode to Monitor mode to make a new recording. See Figure 3.2.8.3.2-2.
Note: Voice Loopback overrides the Color Code (CC), Modulation Mode, and Test Pattern settings
during playback. The R8100 captures and resends the Color Code, destination ID (address) and call
type sent by the radio. For the radio to audibly reproduce the message the radio must be set to a Group
Call or an All Call channel.
SYNC Pattern (DMR submenu)
Choose the data synchronization pattern for testing with the R8100, BS Sourced Voice for a base station
/ repeater or MS Sourced Voice for a portable / mobile station.
Copy CC to Generator (DMR submenu)
Sets the R8100 Generator to use the last color code that was received in Monitor mode.
Burst (DMR submenu)
Choose one of the 6 super frame bursts for the R8100 to display radio transmitter quality measurements
for. Use the horizontal submenu to select the desired burst (A through F). The following measurements
are made from the selected burst: Input Level, Constellation, Symbol Deviation, FSK Error, and
Magnitude Error.
BER Test (DMR submenu)
Start or Stop Bit Error Rate (BER) testing in the DMR mode of the R8100. This bit error rate test checks
the modulation, encoding and timing of the transmit signal during the data transmission period. When the
BER Test is running the radio transmitter under test must be placed into a test diagnostic mode with the
correct TX test pattern selected using the manufacturer’s Radio Service Software (RSS) / MOTOTRBO™
Tuner. The test is done at nominal power with the radio transmitting the O.153 super frame test pattern
into the service monitor. (It is acceptable to have an attenuator between the radio under test and the service
monitor.) BER test results, the percentage of bit differences between the O.153 pattern and the bits of the
synchronized TDMA slot of the received signal, are shown in the DMR zone in the BER field.