Northern Airborne Technology PA700 - Manual (Page 9)

PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-5
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.5.3.3 TS92-06XN
The six-bell speaker array is most often used for fixed installations where size and weight are of minor
importance but the need for maximum radiated power is primary. The six-bell speaker is also used in
larger aircraft with higher-powered amplifying systems.
1.5.3.4 Multiple Speakers
The four-bell loudspeaker, TS92-04XN is designed to be assembled in groups of two, four or more. This
permits the use of multiple amplifying systems for higher sound levels and greater distance.
1.5.4 Power Supplies
Power can be supplied by storage batteries, electronic supplies or vehicle/aircraft power systems. Vehicle
supplies of 24 – 28 Vdc are an obvious choice for most airborne/mobile installations. The 12 – 14 Vdc
supply of the commercial vehicle can not be used.
In the hand-pack series, sealed nickel cadmium cells are used. Adding extra cells can almost double the
available power.
Electronic power supplies are frequently used in maintenance shops and fixed installations. A minimum
requirement would be a well regulated supply of 20 – 40 Vdc at 25 A.
1.5.4.1 VR33-002 Power Converter
The VR33-002 is a power conversion device designed to increase the nominal 28 Vdc aircraft voltage to
33 Vdc using high speed switching DC-DC conversion. The VR33-002 is designed to be used with the
PA700 Series Audio Power Amplifier.
Section 1 ends