Mast Details as provided by Network Rail

1. Mast height is to be 29 metres.
2. Location shown on Intro post. More precisely:- OS 243480 068840.
3. Antenna type: Kathrein 800 10203 (2 off) SPEC
4. Direction Antenna (Narrow Beam): Horizontal 65° Vertical 10°
5. Orientation:1. 90° (Harewood); 2. 220° (Bere Alston)
6. Power Gain: 55 to 59dBm (See ... )

Directional antenna have peak radiation intensity in the particular direction shown in the next diagram by the longest finger (lobe).

Beam width is the angular distance between the points on two opposite sides of the peak direction where the radiation intensity drops to the half of the peak intensity, which I have marked by a red line. This is the 9 or so degrees. You can see than there is a powerful signal in many directions closer to the antenna.

The long lobe will be directed almost horizontally towards Harewood as the track is almost in a straight line in the vertical plane. A small tilt downwards may be incorporated.

The following diagrams only show the relative radiation strength. The input to the antenna is the overriding measurement. For this type of antenna 500 watts input is the max.

Relative beam intensity in the vertical plane

Relative beam intensity in the horizontal plane towards Harewood

Relative beam intensity in the horizontal plane towards Bere Alston

Combined relative beam intensity in the horizontal plane

Radiation overlay on street plan

Does the mast need to be 29m (95ft)

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