HOW TO RECOGNISE DIFFERENT TYPES OF BROADCASTING AERIALS FROM A QUITE A LONG WAY AWAY
By Mike Smith
LESSON 4: MF - MEDIUM FREQUENCY AM RADIO
Figure 34 show a typical high power medium wave station at Droitwich.
Figure 35 shows a BBC medium wave station in the south-west, consisting of two masts with a wire aerial strung between the two. As with figure 32, I have highlighted the wires in this photo for extra clarity, as they are rather indistinct in the original. The vertical wires rising from the feed point between the two masts form the aerial itself, the main radiating part. The top horizontal wires, between the two masts, not only support the main vertical wire aerial, but also form the top part of the 'Inverted L' antenna. This physically and electrically lengthens the aerial to make it more efficient, although the useful part of the signal is only radiated from the vertical section.
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