Some time ago, I was asked about the directivity of my Körner 9.2 antenna. Using the Konrad XDR-GTK software, I was able to take some 360° plots.
To save too much unnecessary rotation of the rotator, some of these plots are reversed 180 degrees as I took the readings while the rotator was travelling back to zero. As a result, Belmont appears to be in the North Sea, etc. Those which are reversed will be highlighted in the descriptions. I hope this is of interest, but antenna directivity will be marred as the antenna was only two metres above the roof (fully lowered) when these plots were taken.
Also, you can see how the XDR-F1HD attenuates signals above a certain level.
Beamed directly at my three local transmitters with the 9.2 horizontal, these are the signal strengths I have:
To save too much unnecessary rotation of the rotator, some of these plots are reversed 180 degrees as I took the readings while the rotator was travelling back to zero. As a result, Belmont appears to be in the North Sea, etc. Those which are reversed will be highlighted in the descriptions. I hope this is of interest, but antenna directivity will be marred as the antenna was only two metres above the roof (fully lowered) when these plots were taken.
Also, you can see how the XDR-F1HD attenuates signals above a certain level.
Beamed directly at my three local transmitters with the 9.2 horizontal, these are the signal strengths I have:
Belmont: 84 dBf. Tacolneston: 70 dBf. Peterborough: 66 dBf.
There is no real difference to these readings when the antenna is two metres higher, but I do not have plots for this. Ground wave signals from inland start to increase which is not desirable, however, continental scatter is not affected by the antenna height. The only other detrimental effect with the 9.2 lowered is a slight increase in man-made noise levels.
There is no real difference to these readings when the antenna is two metres higher, but I do not have plots for this. Ground wave signals from inland start to increase which is not desirable, however, continental scatter is not affected by the antenna height. The only other detrimental effect with the 9.2 lowered is a slight increase in man-made noise levels.
88.8 BBC Radio 2, Belmont (Antenna Horizontal)
89.7 BBC R2, Tacolneston (Antenna Horizontal)
90.1 BBC Radio 2, Peterborough (Antenna Horizontal)
93.1 BBC Radio 3, Belmont (Antenna Horizontal) (Reversed Plot)
95.6 BBC Radio Norfolk, West Runton (Antenna Horizontal)
95.6 BBC Radio Norfolk, West Runton (Antenna Vertical) (Reversed Plot)
95.9 BBC Radio Humberside, High Hunsley (Antenna Horizontal)
104.4 BBC Radio Norfolk, Great Massingham (Antenna Horizontal) (Reversed Plot)
104.4 BBC Radio Norfolk, Great Massingham (Antenna Vertical)
106.4 Kiss FM, Mendelsham (Antenna Horizontal)
106.4 Kiss FM, Mendelsham (Antenna Vertical)
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