MT-MR PLATINUM. POINT TO POINT AURAL RADIO RELAY SYSTEM
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Fig. 3. DISTRIBUTION OF FIRST & SECOND FRESNEL ZONES ALONG PATH
As can be seen above in Fig. #3, higher order Fresnel Zones are distributed in concentric rings over the First Zone
along the propagation path. When planning flat-terrain links, it will be relatively easy to block the Second Zone and
completely clearing the First Zone, but in some hops, particularly those located between high mountains, it will be
not possible. In these cases, a complete clearing of both Zones should be allowed.
Radius of any Fresnel Zone at any point of intermediate path can be easily determined by the following expression:
d
1
. d
2
(2) R(n) = 31.6 n.
λ
d
3
Where:
R(n) = Radius (in meters) of a Fresnel Zone of nth. Order.
n = Order of the Fresnel Zone considered.
λ
= Wavelength of propagated signal.
λ
[meters] = 300/f [MHz]
f = Carrier signal frequency (MHz).
d
1
= Distance from Transmitter point (A) to
considered point (X). [Km]
d
2
= Distance from considered point (X) to Receiver point (B). [Km]
d
3
= Total distance from A to B. [Km]
