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RAY
SUB
S IMPLEMENTATION
t
θ
t
θ
IMPORTANT
- “Steering” techniques should not be applied to clusters of less than 3 RS18;
- Coverage control through steering technique increases with cluster height.
Steering can be applied by unit, group of 2 or group of 3 in Omni Mode as well as in Directional Mode.
GROUP OF 2 RS18S STEERING
GROUP OF 3 RS18S STEERING
“Steering” delays values for the pairs can easily be computed according to following formula:
τ
= h*sin(
θ
)/C (metric)
τ
is the value to be applied to the second pair
h is the height of tilted elements ( 1.04m for 2 RS18s, 1.56m for 3 RS18s)
C is the speed of sound ( = 343m/s )
7.3.2 Delay
values
implementation
•
If the coverage is to be tilted down, then top group delay should be set at 0ms and delay should
progressively increase on lower groups.
•
If the coverage is to be tilted up, then lower group delay should be set at 0ms and delay should
progressively increase on upper pairs.
•
Delay value for first group is always 0ms.
•
Delay value for second unit or group is
τ
•
Delay values for subsequent units or groups are 2
τ
, 3
τ
etc…
