Northern Airborne Technology CC250 - Manual (Page 15)

CC450-0V2 Communications Controller
Installation and Operation Manual
j) Ensure proper Squelch Disable operation by pushing the squelch test button for the transceiver. The
RX/TX annunciator on the CC450-0V2 should light ORANGE.
k) Repeat the above procedure for all active low disable transceivers connected to the CC450.
2.5.1.2
'Active Hi' Squelch Disable Signal (Wulfsberg FF40)
a) Put all the CC450-0V2 Transceiver Select switches in the down (inactive) position.
b) Power up the CC450-0V2 by putting the Power switch in the up (ON) position.
c) Turn the Squelch Logic Threshold Adjustment fully cw.
d) Slowly turn the adjustment ccw until the stops are reached or the RX/TX annunciator on the CC450-
0V2 lights ORANGE.
e) Take note of the adjustment position
f) While depressing the Squelch Test button for the respective transceiver, rotate the adjustment cw until
the stops are reached or the RX/TX annunciator goes out.
g) Take note of the adjustment position.
h) Release the squelch test button.
i) Position the adjustment half way between the two positions reached in steps e) and g).
j) Ensure proper Squelch Disable operation by pushing the squelch test button for the transceiver. The
RX/TX annunciator on the CC450-0V2 should light ORANGE.
k) Repeat the above procedure for all active high disable transceivers connected to the CC450.
2.5.2 Squelch VOX level Adjustments
The Squelch VOX circuitry must be enabled for use with transceivers that do not have a squelch disable
signal (such as a handheld or portable). See Section 2.5 for further details on enabling the Squelch VOX
circuitry.
The Squelch VOX adjustment is used to set the audio level required for the CC450-0V2 to recognize that
the transceiver is receiving. Normally this adjustment is set to the fully cw position, and the Squelch VOX is
disabled internally. The adjustment is rotated ccw to make the Squelch VOX trip on smaller signals, and cw
to trip on larger audio signals. (This feature is only available for the RT1 and RT2 positions of the -xV1
models.)
If the Squelch VOX is enabled internally, then setting the Squelch VOX Level (SVL) can be performed by
the following procedure:
a) Connect a communications monitor, or use another radio to transmit audio to the transceiver that is
connected to the VOX circuit of the CC450.
b) Put all the CC450-0V2 Transceiver Select switches in the down (inactive) position.
c) Power up the CC450-0V2 by putting the Power switch in the up (ON) position
d) Transmit to the CC450-0V2 RT, and adjust the receive audio volume to a comfortable level that would
be used during flight.
e) Adjust the setting of the SVL pot so that when there is an audio signal on the receive audio line, the
TX/RX annunciator on the CC450-0V2 will light ORANGE. When there is no audio being received the
TX/RX annunciator should not be lit.
Section 2 Rev: 1.00 Issue 1 Page 2-5
ENG-FORM: 805-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.