Northern Airborne Technology 250 - Manual (Page 13)

EQUIPMENT MANUAL 250-16-1
250/250-16-1 Page 4
RECEIVER
VOLUME:
Controls level of ADF, PSC and TV audio inputs to the Left and Right
Speaker outputs. Range and control same as Paging Volume
specification.
OUTPUTS:
RIGHT SPEAKER:
The Right Speaker Amplifier is designed for speech and music signals.
Rated Power spec. is the maximum power the amplifier can continuously
deliver into the maximum rated load without clipping.
Load
Rated Power Load
1 ohm 49 W 1 ohms (40 Watts typical)
2 ohm 28 W 2 ohms (30 Watts typical)
4 ohm 15 W 4 ohms (18 Watts typical)
LEFT SPEAKER:
Same as Right Speaker specification
PA SDTN:
This output will deliver 6.7 milliwatts into 600 ohms, continuously. Rated
and continuous power ratings are the same.
CHIME TONE:
Generated and supplied to left and right speaker outputs when 12 to 32
VDC is applied to and removed from connector pins P50-31 or P50-32. A
790 +20 Hz tone. Factory set for 3.5 VP-P into 2 ohms, is adjustable from
1.0 to VP-P.
RINGER TONE:
Generated and supplied to left and right speaker outputs when a ground
signal is applied to connector pin P50-33. Ringer tone is 700 +75 Hz tone,
ON for 1.8 +0.1 second, then OFF for 3.2 +0.1 second, repeating, and is
factory set for 1.5 VP-P (700 Hz component) into 2 ohms, adjustable from
0 to 5.2 VP-P.
FREQUENCY
RESPONSE:
Upper and lower frequency limits are adjustable. Stereo, ADF, TV, PSC
inputs to speaker outputs are flat within 3 dB from 25 Hz to 20,000 Hz. All
other inputs to speaker or PA sidetone outputs are flat within 3 dB from 350
Hz to 6,000 Hz.
HARMONIC
DISTORTION
(THD+N):
Less than 0.25 percent distortion, for stereo and less than 1% for ADF, TV
and PSC to all outputs (25 Hz to 20 Khz). Less than 3% for PA and briefer
to all outputs (350 Hz to 6 Khz).