10
SYSTEM OPERATION
Once the radios are selected, pilot or observer can transmit at any
time simply by pressing their PTT switch. When one position
transmits, several things take place automatically to the
transmitting side of the SPCC:
•
The intercom between the two positions is turned off.
•
The Auxiliary audio, if selected, is muted.
•
The receive audio of the radio not selected by the XMIT
SELECT switch is muted, regardless of the position of the
AUTO/OFF/BOTH switch.
•
The selected radio is put into transmit mode.
•
The headset microphone audio (your voice) is sent to
the selected transmitter.
•
Sidetone is generated and sent to your headphones.*
* Sidetone is a portion of the transmitted voice signal sent back
into your headset, so that you can hear what you are saying while
transmitting. The RECeive VOLume control adjusts the volume level of
the sidetone that you hear in your headset. If the AUTO/OFF/BOTH
switch is in the "OFF" position however, you will not hear this
sidetone.
The non-transmitting side is not affected (except for intercom) when
the other side transmits. The non-transmitting side can monitor the
transmissions of the other side by simply selecting the same radio on
his side of the SPCC. Of course, when the PTT switch is released,
(stop transmitting) all functions return to normal, instantly and
automatically.
Simultaneous Transmit is the most attractive and powerful feature of
the SPCC. Both pilot and observer can transmit at the same time -
either on separate radios or on the same radio transmitter! When on
different radios, the pilot and observer will not interfere with each
other's communications. For example, the pilot can talk to air
traffic control while the observer talks on the FM radio to the
ground crew, or vice versa. On the other hand, they can also transmit
on the same radio transmitter. If, for example, the observer is
talking on one of the radios, the pilot can jump right in and add to
the conversation simply by pressing his PTT switch. Both voices will
be heard by the receiving station.
NOTE: Only the aircraft radios and the FM radio can be transmitted
on. The AUXiliary input is for listening only. It can be used for
listening to a police scanner, monitoring the audio portion of a
video camera, listening to background music, and many other
possibilities.
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