Northern Airborne Technology AA24 - Manual (Page 10)

AA24/AA25 Series Single User Audio Controller Manual SM18 Rev. 4.00
1.4 Specifications
1.4.1 Electrical Specifications
Power supply
Voltage
28 Vdc (reverse and over voltage protection)
Current
400 ma. max.
Lighting
28 Vdc @ 160 mA.
Headset Power Phone output is nominal 600 Ω load
Short circuit protected
Typical 200 mW into headset
David Clark H10-30/40 series recommended
Microphone
Industry standard ‘carbon equivalent’ type
250 mVrms for full output
Amplified dynamic microphone preferred
David Clark M1/DC, M3, M4 recommended
(For low Z microphones, AA24-801 or AA25-
801 are recommended)
Indicators Transmit (green LED)
VOX ICS triggered by ICS Tie Line (red LED)
Input Signals:
4 aircraft transceiver radio inputs
5 navigational receiver inputs
2.5 V rms for full output
4.7 k Ω input impedance
1 bi-directional ICS tie line
1 Vpp for full output
2.2 k Ω input impedance
Keylines Transmit key is active low (33 ma. of current)
Intercom key is active low (1 ma. of current)
Intercom line NAT ICS tie line compatible 2k input impedance
(340 mVrms level)
Page 1-2 Nov 21, 2003
ENG-FORM: 800-0106.DOT
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