Mick
Member
Hello! Saw this explanation at the Yahoo socalscan group today:
The LASD radio system basically operates in "half-duplex" mode where-in the
mobiles can not hear each other over the "downlink" transmitter. This system
has been utilized for about as long as I can remember (a very long time) and is
very traditional for the Sheriff's Dept. The reason is that it is thought that
the dispatchers can maintain better control over situations as they unfold,
especially those of an emergent or high adreneline nature. If ANY Deputy
requests, the dispatcher can activate the system into full duplex repeat mode at
their console with the push of a button. During normal operations, the
dispatcher basically "parrots" what the transmitting unit says so the other
units know what and where things are happening. The dispatchers are highly
trained and experienced in this proceedure and it generally works very well.
The "beep" tone is used, as has been noted previously, by the dispatcher to
indicate that A: there is a unit transmitting on one of the input channels the
dispatcher has up on the console ( often up to 3 or more different station
districts at the same time) and therefore ALL other units must not transmit
unless it's emergent. This is also the reason you may hear the same dispatcher
talking on more than one dispatch channel at the same time (all transmitters in
all the station districts that are up on the console are ALL put into simulcast
transmission whenever they key the push to talk switch). B: The dispatcher is
busy with something (running a plate, telephone to a station desk, etc) and is
not listening critically at that moment. C: the "busy" tone can be activated
to come on automatically whenever there is a unit transmitting on an input
channel.
Hope this helps to clairify the query.
Gene Thielman
Communications Technician
Los Angeles County Sheriff
Radio Services Section
The LASD radio system basically operates in "half-duplex" mode where-in the
mobiles can not hear each other over the "downlink" transmitter. This system
has been utilized for about as long as I can remember (a very long time) and is
very traditional for the Sheriff's Dept. The reason is that it is thought that
the dispatchers can maintain better control over situations as they unfold,
especially those of an emergent or high adreneline nature. If ANY Deputy
requests, the dispatcher can activate the system into full duplex repeat mode at
their console with the push of a button. During normal operations, the
dispatcher basically "parrots" what the transmitting unit says so the other
units know what and where things are happening. The dispatchers are highly
trained and experienced in this proceedure and it generally works very well.
The "beep" tone is used, as has been noted previously, by the dispatcher to
indicate that A: there is a unit transmitting on one of the input channels the
dispatcher has up on the console ( often up to 3 or more different station
districts at the same time) and therefore ALL other units must not transmit
unless it's emergent. This is also the reason you may hear the same dispatcher
talking on more than one dispatch channel at the same time (all transmitters in
all the station districts that are up on the console are ALL put into simulcast
transmission whenever they key the push to talk switch). B: The dispatcher is
busy with something (running a plate, telephone to a station desk, etc) and is
not listening critically at that moment. C: the "busy" tone can be activated
to come on automatically whenever there is a unit transmitting on an input
channel.
Hope this helps to clairify the query.
Gene Thielman
Communications Technician
Los Angeles County Sheriff
Radio Services Section
iepoker said:
