Publication: Magyar Közlöny
Issue: MK-2003-40 (Year: 2003, Number: 40)
Era: 1990-2004
Section: a 23/2003. (IV. 24.) GKM rendelethez*
Paragraph Index: 421

d) Directional properties The sound pressure level of a directional whistle shall be not more than 4 dB below the prescribed sound pressure level on the axis at any direction in the horizontal plane within +/—45 degrees of the axis. The sound pressure level at any other direction in the horizontal plane shall be not more than 10 dB below the prescribed sound pressure level on the axis, so that the range in any direction will be at least half the range on the forward axis. The sound pressure level shall be measured in that 1/3 rd-octave band which determines the audibility range.

Source: https://magyarkozlony.hu/hivatalos-lapok/2e72167675ab9de53a766f2e8ff24eebb8b45c9c/dokumentumok/3fc892723f784b7239921e296e1ba2f32c28559e/letoltes