efore it is suggested that a visit is made to the candidate locations. As they are related to the test transmitter locations the test measurement routes also have to be well planned. The following are instructions for selecting the test transmitter locations and planning the measurement routes for model tuning: The locations and routes need to represent the area well, with typical places inside the area. All the clutter types are covered by the measurement locations. Several locations are required in the same area (e.g. one city) in order to get a good general view. Extensive measurement routes are needed to get statistically valid data of all the clutter types, SO that all types are covered equally. Restrictions of the tuned propagation model have to be considered when planning the measurements. The model tuning measurements start by setting up the test transmitter in the first measurement location. The drive test is run according to the preplanned measurement route. The tests are continued until enough data are collected for the planned analysis. According to good measurement practices, the Radio Network Planning and Optimisation Table 2.8 Correction factors Clutter type Correction factor [dB] Water Rural Forest Suburban Industrial Urban Dense urban field measurements need to be well documented. Special parameters related to model tuning are required in the analysis phase: coordinates for the test transmitter location; test transmitter antenna type, height and direction; power of the test transmitter; cable types and length, or if possible measured cable losses. After the field measurements are finished it is time to analyse the data, i.e. tune the model. Different planning tools provide help for model tuning. The planning tool requires the measurement data, which is exported from the receiver and model tuning related parameters documented during the tests. The location of the test transmitter is first specified on the planning tool's digital map and then all the other data related to it is added. The data need