SM34 Rev. 4.00
AA21-400 Cabin PA System Manual
Output Signals
Speaker:
Impedance and short circuit protected.
≤
10% THD
20 W single tone into 8
Ω
@ 50% duty cycle. Continuous.
20 W voice/music into 8
Ω
@ 100% duty cycle. Continuous.
Note: Distortion is
≤
3% THD at 10% of continuous
output power rating.
> 10% THD
35 W max. into 8
Ω
with 2.5 Vrms into Radio (Receive) input.
Non-continuous
(short
term).
Audio bandwidth: Mic input:
≤
3 dB roll-off from 350 Hz to 3 kHz
Radio (Receive)/CD input:
≤
3 dB roll-off from 350 Hz to 6 kHz
PA:
Selectable by internal jumper for either
PA110/220 (6.5 Vrms
±
10% into 600
Ω
) or
PA250/700 (0.5 Vrms
±
10% into 600
Ω
) for rated output.
Distortion:
≤
3% THD at rated output.
Audio bandwidth: Mic input:
≤
3 dB roll-off from 350 Hz to 3 kHz
Radio (Receive)/CD input:
≤
3 dB roll-off from 350 Hz to 6 kHz
Siren:
Only available on PA output (735 to 1620 Hz). Yelp
and wail modes with adjustable rates. Siren level
control provided for yelp/wail by one internal trimpot.
Sidetone:
Adjustable 0-100 mW into 600
Ω
with
≤
10% THD
Audio
bandwidth:
≤
3 dB roll-off from 350 Hz to 3 kHz
Input to Output
≤
-50 dB from rated output.
Crosstalk:
Audio Noise Level:
≤
-50 dB from rated output.
(without
signal)
Switched Power:
+27.5 Vdc @ 0.40 Amps max.
Over current protected.
Temperature Sensor
The unit contains a temperature sensor IC which
when triggered reduces the input signals by 3 dB.
The IC threshold is set to approximately 130
°
C.
Annunciator
Power On (illuminates green when active)
Nov 10, 2003
Page 1-3
ENG-FORM: 800-0106.DOT
Amendment #2
May 24, 2006
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The document reference is online, please check the correspondence between the online documentation and the printed version.
