Northern Airborne Technology 245 - Manual (Page 11)

SM245 Rev. 4.10 Model 245 Speaker Amplifier Manual
Section 1 Description
1.1 Introduction
This manual contains information on the Model 245 Speaker Amplifier. Information on
the 245-001 and 245-002 is included; all other derivative products (245-xxx) will be
covered by manual supplements, which can be obtained from NAT as required.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The Model 245 is a Speaker Amplifier that is capable of driving a 4-ohm cockpit
speaker. It is intended to be a direct replacement for the Collins model 356F-3.
1.3 Features
The Model 245 is rated at 18 watts into a 4 ohm load. This is a peak rating intended for
speech and music. The continuous rating of the amplifier is 10 watts into 4 ohms, sine
wave.
For proper heat dissipation, the unit should be mounted to a metal surface of at least
100 square inches.
1.4 Specifications
1.4.1 Electrical Specifications
Power Supply 2.5 amps max @ 27.5 Vdc.
A 5 A circuit breaker is recommended
Input:
7.75 Vrms into 600 ohms ( 245 base unit only)
Speaker Output 18 Watts into 4 ohms @ <1 % distortion (rated power)
25 Watts into 8 ohms @ <1 % distortion (rated power)
Output Noise
-70 dB below 10 watts
Jun 23, 2005 Page 1-1
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.