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6
QTR-2/QTR-600 Wireless Portable
Audio Control Switch Modes
The QTR-2/QTR-600 portable has only two operating controls: a combined on/off and
headset volume control, and a push-button audio control switch. The function of this switch is
internally programmable to any of the following three modes:
1) Push-to-mute (transmitter remains "on;" audio is continuous until interrupted by
depressing the switch). This mode allows the user to cancel transmitted audio during a
cough or during a local conversation, while continuing to transmit an unmodulated
signal (to override weaker interfering signals that might be received at the master
station).
2) Push-to-enable (transmitter remains "on;" audio is disabled until the switch is
depressed).
3) Push-to-talk (transmitter and audio are both "off" until the switch is depressed). This
mode allows simplex communications between an unlimited number of portables,
without a master station.
The use of the push-to-talk mode is discouraged for normal applications due to the
high-sensitivity of the system receivers and the possibility of weak interfering signals
being received (which often results in very noisy system output).
Typical sources of interfering signals include: spurious outputs from poorly adjusted
two-way radio transmitters; harmonic output from FM radio transmitters; radiated
harmonic energy from clock signals in computers and other digital equipment; leakage
from CATV and MATV systems; and inadequately shielded RF test equipment.
S1
Intercom
Interface
1
2
3
4
5
Clear-Com*
Clear-Com
(Dry)*
Clear-Com
TW*
RTS*
RTS (Dry)*
Telex*
4-Wire
X X
X X
Carbon Mic
X X
X X
2-Wire**
Carbon Mic
X
3-Wire**
Table 1. QX-6A/QX-600 master station switch settings for standard intercom systems. NOTE: "X"
designates switch is "ON"; a "blank" designates switch is "OFF".
*Turn master station headset "SIDETONE" control (R166) to minimum.
**NOTE: Carbon-mic systems vary widely in technical implementation. If these settings do not
work properly, consult the Vega factory.
S2
6
7
8
9 10 1
2
3
4
5
6
X
X
X
X
X
X
X
X
S3
7
8
1
2
3
4
5
6
7
8
1
X X X
X
X
X
X
X
X
X
X
X
X
X X
X X X X X
Q PLUS
S4
S5
2
3
4
5
6
7
8
1
2
3
4
X X
X X
X
X
X X
X
X
X
X X X
X X
X X X X
X X
X X X X
X X
X X X X
X
X
5
6
7
8
X X
X
X X X X
X X X X
X X X
X X X
X X X
X X X
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