SAC SS-800AVS Manual page 11

SPECIFICATIONS FOR ELECTRICAL CONNECTION BETWEEN AUDIO SOURCE AND
TRANSMITTER SITE: For short distances of up to 300 feet, direct
connection of the audio drive source to the transmitter audio input
may be made through a twisted wire pair or 600 ohm open wire pair.
For greater distances, equalization of the audio line may be required
to prevent loss of the higher audio frequencies.
For installation requiring the use of leased telephone circuits
from the audio source to the transmitter site, the following should
be specified when ordering the circuit:
i. Line impedance 600 ohms, balanced, audio only.
2. Line equalization for frequencies 400 Hz to 2800 Hz.
3. Maximum line input +5 dBm.
4. Normal equipment input -8 dBm.
5. Maximum line loss -12 dBm.
If DC current is present on the telephone pair, the DC current
shall be isolated from the transmitter audio input. Maximum DC
component to the transmitter audio input is 3 mA DC.
Line coupling devices installed at the transmitter shall not be
such that RF energy emitted from the transmitting antenna will
be demodulated in the coupling device with the demodulated audio
appearing as an audio input to the transmitter. Coupling devices
containing varistors should not be used unless RF energy is
bypassed.
SS-800AVS Southern Avionics
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