3
I. Basic Description
The DAB-300 is a dual 4-channel audio switch intended for simultaneously
switching parallel program audio feeding analog and digital broadcast transmitters
where synchronous timing such as in IBOC operations is important to maintain. It
functions similar to a 4 position dual pole switch in that when audio to the analog
transmitter is switched, the output feeding the digital transmitter is switched to the
corresponding program source for the analog transmitter. Automatic silence detection
may be enabled to switch both analog and digital program feeds if either becomes silent
for a period which exceeds the user defined interval.
The DAB-300 can be ordered for four or eight inputs. The inputs can be AES3 digital
and/or analog L/R and composite base band depending on model.
II. DAB-300 Operational Description
The DAB-300 may be placed in the manual switching mode by pressing either the left or
right arrow key. The source selected will begin to flash. Select the desired input using
the up and down arrow keys. When the desired input channel is flashing press the
green enter key to accept the selection and switch to the selected input. If a channel is
not selected within 1 minute the DAB-300 will exit the manual switching mode
automatically. Note that the inputs will be selected in pairs. If Input 1 is selected to feed
the analog transmitter, Input 5 will be directed to the digital transmitter. The other inputs
(2/6, 3/7 and 4/8) are paired similarly.
III. REMOTE CONTROLLED OPERATION
The DAB-300 provides remote control to select between inputs and to enable/disable
remote operation. Open collector status outputs are provided to indicate the currently
selected input channel. These outputs are capable of sinking up to 100ma and are rated
at a maximum of 30v DC.
Remote Channel Selection:
The DAB-300 DAS provides 4 channel selection inputs and 4 channel status outputs on
the remote control DB-25 connector. Each output channel pair (1-4) is controlled via its
respective channel select pin (GPI 0-3) and provides a status output (GPO 0-3) which
reflects which of the 4 input pairs (1/5 through 4/8) is currently selected. A momentary
(12 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals