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Anticipated coverage:

Three anticipated coverage maps are attached as follows.

1. Three Rock 106.8mHz anticipated signal strength at a reference height of 10m above ground level, vertical receive antenna.

This anticipated coverage map was generated using a digital terrain database of grid step 500m. The prediction model used considered free space path loss (Fresnel method), multiple knife edge diffraction losses (Deygout 1994) and 0.8 Fresnel Zone Fraction fine integration sub path occupancy. Clutter heights and losses were not applied. The field strength was predicted for a vertical polarised receiver antenna at a height of 10m from ground level. The coloured field strength contours shown (>=54 dBµV/m, >=60 dBµV/m and >=66 dBµV/m) are the median values predicted for 50% time availability and 50% of locations in the short sector.

2. Three Rock 106.8mHz anticipated stereo coverage.

This anticipated stereo coverage map was generated using a digital terrain database of grid step 500m. The prediction model used considered free space path loss (Fresnel method), multiple knife edge diffraction losses (Deygout 1994) and 0.8 Fresnel Zone Fraction fine integration sub path occupancy. Based on the BTS knowledge of the greater Dublin area, attenuation has been applied to account for global clutter loss, 5dB local/12dB urban and the receiver antenna in the computer model has been reduced to 1.5m above ground. The coloured field strength contours shown are the median values predicted for 50% time availability and 50% of locations in the short sector for stereo quality signals in rural and urban locations at the operating frequency of 106.8Hz. The base useable signal level contour used in the prediction model of 54dBmV/m or - 63dBm is in practice a conservative figure and most mid price range radio receivers will perform satisfactorily up to just outside the fringe contour areas.

3. Three Rock 106.8mHz anticipated mono coverage.

This anticipated mono coverage map was generated using a digital terrain database of grid step 500m. The prediction model used considered free space path loss (Fresnel method), multiple knife edge diffraction losses (Deygout 1994)) and 0.8 Fresnel Zone Fraction fine integration sub path occupancy. Based on the BTS knowledge of the greater Dublin area, attenuation has been applied to account for global clutter loss, 5dB local/12dB urban and the receiver antenna in the computer model has been reduced to 1.5m above ground. The coloured field strength contours shown are the median values predicted for 50% time availability and 50% of locations in the short sector for mono quality signals in rural and urban locations at the operating frequency of 106.8Hz. The base useable signal level contour used in the prediction model of 48dBmV/m or - 69dBm is in practice a conservative figure and most mid price range radio receivers will perform satisfactorily up to just outside the fringe contour areas.

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