TR 62002-4 @ IEC:2009(E) 6 - 5.2 Measurement chamber Measurements are performed in an anechoic measurement chamber with a capability for full should be taken that the positioner construction (i.e. size) does not disturb the nearly omnidirectional antenna. The shielding effectiveness of the chamber should be good enough so that at least 10 dB marginal remains below the sensitivity level of the terminal. The required size of the chamber can be estimated so that far-field conditions between the radiating antenna and the terminal apply: 2D2 ,3D,3 where HNTERTAMUSEN HISLOCANONBANYASORLED BY BOK SUPLY BUREAU. is distance between the radiating element and the terminal; D is the maximum extension of the radiating element; a is the longest wavelength used. 5.3 Frequencies LI The TRs measurements are carried out at channels 22 (482 MHz), 45 (666 MHz) and 54 doesnotincludetheGsM-rejectfilterhigherchannelsmaybeused.Iftheterminalisintended to be used on other frequency bands, these can be added according to the need of the market NCHI area. 5.4 Sampling grid The practical measurement is carried out by stepping the zenith and azimuth angles and p with a sampling grid. A recommended value for the sampling grid is 30°. Other values like 15° can be used if higher accuracy is needed. 6 Measurement procedure Set-up 6.1 The terminal is placed in the measurement chamber and a DVB-T/H signal source is connectedtothetransmittingantenna. A measurement interface according the IEC 62002-3 using a Bluetooth (BT) link is used for controlling the terminal so that it can be set to the different operating modes and reading degradation information from the terminal. A wireless link like the Bluetooth is preferred over the wired links due to the minimum effect on the terminal antenna behaviour. If desired, the whole measurement procedure can be made automatic if the measurement controller is controlling the positioner, signal source and the terminal. 6.2 Calibration The measurement system is calibrated by replacing the terminal by a reference antenna with source power level is set to a reference value and the received power from the power meter is observed. The true isotropic power can now be calculated using the known antenna characteristics (antenna factor or antenna gain are the usual values given). The reference - 10 - TR 62002-4 @ IEC:2009(E) value of the power level in the signal source thus corresponds to this isotropic power. Note that the calibration should be done at all frequencies that will be used in the actual measurement.Alsobothpolarisationsshouldbecalibrated Example: a) The signal source power level is set to -10 dB(mW) b) A reference dipole with a gain of 2,15 dBi is used. c) Power meter reading is -61,5 dB(mW) d) Ilsotropic power P = -61,5 dB(mW) -2,15 dB = -63,65 dB(mW) e) Power setting -10 dB(mW) corresponds to isotropic power of -63,65 dB(mW). 6.3TRS measurements AAEDYOOKSULBURAU After the calibration the reference antenna is replaced by the terminal. The frequency is set to selected. The terminal is set to the first position with the positioner and the power level in the signalsourceis adjusted until theterminalisatthe sensitivitythreshold.Themeasurementis thenrepeated with the vertical polarisation.Afterthese measurementsthe nextpositionis selected and the same measurements are carried out in this position. The procedureis repeated for all positions. AftercompletingthemeasurementstheTRscanbecalculatedfromthemeasuredEisvalues using the formula given in 4.2. CH The TRS measurement is performed at all three measurement channels 22 (482 MHz), 45 (666 MHz) and 54 (738 MHz). 6.4 EIS measurement From the TRs measurement the best direction is observed at the middle frequency, channel 45andtheterminal issettothecorrespondingposition,usingthebestpolarisation.Withthis position the EIS is measured at every channel between 21 (474 MHz) and 55 (748 MHz) 6.5 Calculation of the TRS at other channels method can be used. a) Difference △(f) = TRS(f) -