Freedom R8100 SERIES, Руководство оператора

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Figure 3.2.8.5-1 Main screen after selecting P25 Trunk Test Mode
When the P25 Trunk Test Mode is selected the R8100 is automatically placed in Duplex mode and begins
transmitting idle messages on the control channel with no encryption. Pressing the P25 Trunk soft key on
the main screen displays a submenu with the following settings (see Figure 3.2.8.5-2).
A P25 trunked radio connected to the R8100 and turned on automatically registers with the analyzer if the
Band Plan settings are configured for the system under test. The registration progress is shown in the
Meter Zone “Status” field, and the radio ID parameters are populated on the display.
Once the radio is registered (see Figure 3.2.8.5-3 Meter Zone), a voice test using the Voice Loop feature
can be performed. Keying the radio under test transitions it to the voice channel and the R8100
automatically records up to the last 10 seconds of conversation, as long as the signal is above the squelch
level setting. Unlike other test modes, the Voice Loop feature is always enabled in P25 Trunk test mode.
The maximum length of a recording is fixed at 10 seconds. The recording continues if the transmission is
longer than this duration, but only the most recent is retained. Modulation Fidelity, Symbol Deviation,
and Symbol Rate Error measurements are available for the transmission signal being recorded; for
explanations see section 2.2.7.3 for the PROJECT 25 Test Mode (Conventional). When the radio is un-
keyed the R8100 initiates a voice call and replays the last recorded conversation; to play another
conversation another recording must be made. This provides a quick end-to-end test of the P25 radio