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Directivity
The axial directivity factor R
was computed at each one-third-octave center frequency from
the horizontal/vertical polars. The graph in Figure 2 illustrates
this data over the range 3 kHz to 20 kHz. The axial frequency
response of the HPT64 horn with a particular driver is in close
correspondence to that driver's power response above 3 kHz.
Figure 2: Directivity vesus Frequency
© Telex Communications, Inc. 02/2001
Part Number 38109-969 Rev A
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. (formerly Q) of the HPT64 horn
θ
Figure 1: Dimensions
Beamwidth
A plot of the HPT64's 6-dB-down total included beamwidth
angle is shown in Figure 3 for each one-third-octave center
frequency. The horizontal beamwidth is maintained at 60°
(+20°, -10°) over the range of 3 kHz to 20 kHz. Vertical
beamwidth control occurs only above 4 kHz.
Figure 3: 6-dB-Down Beamwidth versus Frequency
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