Freedom R8100 SERIES, Operator'S Manual

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2.2.7.7 TETRA Test Mode
The R8100 TETRA Test Package option / TETRA Test Mode allows testing of radios compliant with the
ETSI Terrestrial Trunked Radio
(TETRA)
Direct Mode Operation (DMO) radio transmission protocol per
ETSI specification EN 300 396. TETRA radios use a digital transmission format employing π/4 DQPSK
modulation at 18000 4-bit symbols per second with a channel access method of Time Division Multiple
Access (TDMA) technology with four slots per frame. Pressing the TETRA soft key initiates the TETRA
test mode. On the R8100 main display the Standard mode’s Audio Zone and Audio Zone soft key are
replaced by a TETRA soft key and TETRA specific content – see Figure 2.2.7.7-1. In addition, Power
Profile, Modulation Spectrum, and Constellation displays are available in Display Zone.
The manufacturer’s Radio Service Software (RSS) is not required to perform tests in TETRA mode. Tests
include slot power, Frequency Error, Residual Carrier Magnitude, error vector magnitude (EVM),
Unwanted Power, Power Profile, Modulation Spectrum, and Constellation. Averaging can be applied to
some measurements, by the System Settings and/or TETRA settings.
Note: TETRA QAM modulation is not supported.
Figure 2.2.7.7-1. Main screen in Monitor mode after selecting TETRA Test Mode