Safety Notes; Introduction - Lectrosonics IFBR1a-VHF Instruction Manual

IFBR1a-VHF

Safety Notes

Excessive sound levels can cause permanent hearing
damage.
1. Always adjust the volume to the lowest level before
listening to unknown transmissions.
2. Use the lowest reasonable level consistent with
hearing safety.
3. Don't use high sound levels in the earphone to
overcome high ambient sound levels. That is
absolutely foolish! Demand and use high isolation
earphones.
4. Don't expose your ears to sound levels that cause
them to ring. If your ears do ring after exposure,
think of it as a warning bell telling you not to do
that again.
OSHA (Occupational Safety Health Administration)
guidelines on the maximum allowable time exposure to
sound pressure levels that will cause hearing damage
are as follows:
8 hours at 90
4 hours at 95
2 hours at 100 db
1 hour at 105 dB
30 mins at 110 dB
15 mins at 115 dB
NEVER expose your ears to 120 dB SPL or higher!
Damage will occur.
2
dB SPL
dB SPL
SPL
SPL
SPL
SPL

Introduction

The IFBR1a-VHF receiver expands the available fre-
quencies of the Lectrosonics IFB system to alleviate the
crowding that has taken place in the UHF spectrum. By
operating the IFB system in the VHF frequency range,
spectrum is freed up in the UHF spectrum where wire-
less microphone systems typically operate.
Antenna lengths at VHF frequencies are longer than
in the UHF spectrum, however, this is rarely a concern
with the IFB receiver since its antenna is the earphone
cable. The antenna on the IFB transmitter is a straight
whip that is normally oriented vertically and positioned
above an equipment rack or cart.
LECTROSONICS, INC.