mbos8a_eng (13.03.2014)
- 10 -
Kompetent für Elektroniksysteme
mbos8a_eng (13.03.2014)
- 11 -
Kompetent für Elektroniksysteme
External Signalling Device
An external signaling device can be connected to
Major BOS 8a
. The sensitivity of the
potential-free inputs can be adjusted with the potentiometer
P11.
By activating the corresponding PTT button input (
PTT3
) the external signal is transmitted
to the selected radio channel(s). Here, an additional external switch contact can be
connected as PTT button.
Transmitter Control
The transmitters of the selected radio channels are activated with one of the PTT buttons
(e.g. handset or headset) and stay activated as long as the PTT button is being pressed.
During transmitting the corresponding transmitters are automatically activated.
It is always possible to transmit on non-activated radio channels by using the red PTT
buttons on the control panel.
The transmitter control can be switched to ground or to +12V. The logic of the PTT button
outputs can be configured separately for each radio with the jumpers
J10
to
J17
. By
using the
open-collector
outputs it is easily possible to connect several Major BOS 8a
in parallel circuit.
Connection to Telephone AF
The audio-frequency connection is not integrated in the
Major BOS 8a
anymore. But
by connecting the external headset-adapter the headset can be used as a combined
communicating device for telephone and radio.
The headset is switched to the telephone by an opto-coupler input, which has to be
programmed accordingly (
see section Opto-Coupler Input
).
Microphone Selection
For each of the 3 PTT inputs it is possible to program the corresponding microphone
individually in register 052. Additionally there are
two
ways of automatic headset
detection:
- the PTT2 input can be programmed as headset detection (programming
register 04C
)
- the Major BOS 8a can detect if a headset is connected by measuring the headset
supply voltage (programming
register 051/052
).
The threshold level in register 051 has to be set so that the measured supply voltage
(at ST10 between Pin 2 and 5) without headset is higher and with headset is lower than
the threshold level. If the PTT2 input is used as headset detection the Major BOS 8a
detects the headset when the input is activated (bridge to ground (GND)). If the Major
BOS 4a has detected a headset then all buttons programmed as SH/HS-PTT use the
headset microphone. Otherwise they use the gooseneck microphone.
Channel Selection
(additionally)
In register 04E you can program whether the loudspeaker is turned on simultaneously
when activating the radio circuit. In register 04F you can program whether the loudspeaker
is turned off simultaneously when deactivating the radio circuit.
Summary of Contents for Major BOS 8a
Page 1: ...Major BOS 8a...