2006-6-28_Detailed explanation of repeater parametersDetailed explanation of repeater equipment parameters1. Working frequency bandThe working frequency band refers to the actual working frequency range of the repeater in the linear output state. The equipment can use all or part of the working frequency band according to the needs. Corresponding to the 900MHz/1800MHz frequency band: Uplink 885~909MHz/1710~1730MHz Downlink 930~954MHz/1805~1825MHz 2. Nominal maximum output power2. 1 DefinitionNominal (maximum) output power refers to the maximum output power that the repeater can achieve in the linear working area. This maximum output power should meet the following conditions: (a) The input signal is a GSM continuous wave signal; (b) The gain is the maximum gain; (c) This power should not be exceeded in network applications2.2 Measurement method1. Connect the test system as shown in Figure 1; GSM signal generator Repeater under test Power attenuator GSM analyzer or power meter 10MHz or 13MHz reference signal Figure 1: Nominal (maximum) output power test 2. Connect the output of the GSM signal generator to the input port of the device under test through a cable, and then input the total loss value of the power attenuator and the connecting cable into the GSM analyzer or power meter as the bias input; 3. Turn off the reverse link (measure the forward output power) or turn off the forward link (measure the reverse output power); 4. Set the GSM signal generator to the center frequency within the operating frequency range of the repeater or the center frequency of the assigned channel; adjust the gain of the repeater under test to the maximum; 5. Adjust the output level of the GSM signal generator until the ALC control point is reached. The power per channel directly displayed on the GSM analyzer or power meter should be within the tolerance range of the maximum output power declared by the manufacturer of the repeater under test; 6. Record the output power level Lout (dBm) and input level (GSM signal generator output level minus the loss value of the connecting cable) Lin (dBm) of the tested repeater; 7. For frequency-shifting repeaters, the near-end unit and the far-end unit should be measured separately. 3. Gain 3.1 Maximum gain and error 3.1.1 Definition Maximum gain refers to the maximum amplification capability of the repeater for the input signal within the linear operating range. Maximum gain error refers to the difference between the actual measured value of the maximum gain and the value declared by the seller. 3……
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