m4a5a_v320_eng (14.02.2013)
- 46 -
Kompetent für Elektroniksysteme
m4a5a_v320_eng (14.02.2013)
- 47 -
Kompetent für Elektroniksysteme
Mode of Operation
Major 4a with TIM supports 3 different modes of operation for transmitter control:
simplex (vox)
,
simplex (carrier)
and
duplex
.
In
simplex (vox)
mode the voice from the telephone and the radio is analyzed. If transmission is
active in one way, it remains activated as long as a voice is present. Only after a certain time without
voice, transmission in the other way can be activated. Levels and delay times for vox are preset, but
they can also be adjusted in the TIM.
In
simplex (carrier)
mode the carrier input of the radio is analyzed, not the voice. For telephone still
the voice is analyzed. The rest of the procedure remains unchanged compared to simlpex (vox). In
simplex mode a maximum time for non-stop transmission or reception can be defined. Exceeding
the time leads to the breakup of the conversation.
In
duplex
mode the transmitter is keyed permanently until the end of the connection. In both simplex
modes the transmitter is keyed via voice control from the telephone. For detecting the voice and keying
the transmitter a certain time is necessary. As a consequence, part of the first word is lost. In order
to prevent this, the ULE can delay the voice transmission from the telephone to the radio. If a longer
delay time is needed, the voice can also be compressed during the delay. There are two different ways
of compression: A-Law cuts in half the resolution from 16 to 8 bit. Furthermore the baud rate can also
be cut in half from 28.8 to 14.4 kHz. For particularly long delays, it is also possible to combine both
types of compression. Ex factory, the mode of operation is “simplex (vox)“ without a delay time.
Reg.
Function
366 1
st
- 3
rd
digit: max. transmission time in simplex mode: nnn * 1s
366 5
th
digit: mode of operation 0=simplex (vox), 1=duplex, 2=simplex (carrier)
367 1
st
- 3
rd
digit: max. reception time in simplex mode nnn * 1s
417 1
st
- 3
rd
digit: voice delay telephone => radio nnn * 1ms
417 4
th
digit: compression:
0 = none (delay time: max. 55ms)
1 = A-law (delay time: max. 110ms)
2 = half the baud rate (delay time: max. 110ms)
3 = A-law and half the baud rate (delay time: max. 220ms)
Voice Message
If the TIM is additionally equipped with the option VMM, the voice messages necessary for connections
to the public telephone network can be transmitted to the telephone participant.
Recording Voice Messages
Recording is controlled via the RS232 interface and can be done from the radio or the telephone.
In the terminal the monitor command including the number of the text and the recording source is
entered. If recording of the voice message is performed from the telephone, the telephone connection
must be established beforehand. The recording is then started and stopped at the terminal using the
space bar.
In theory, a maximum of 240 voice messages can be stored. The total storage capacity is limited to
4 minutes (240s). However, the ULE uses only messages 1 and 2. Ex factory, the following texts are
recorded:
Text 1 (establishing connection: telephone => radio):
„Bitte warten - der gewünschte Teilnehmer wurde über das öffentliche Funknetz gerufen !“
Text 2 (establishing connection: radio => telephone):
„Sie sind jetzt über das öffentliche Funknetz mit dem Teilnehmer verbunden !“
Summary of Contents for Major 4a
Page 1: ...Major 4a Major 5a ...