Specifications

5/2/13 888-2500-001 2-21
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
DAX-1/DAX-3
2.3.6.3.3 Bessel Filter Input Bandwidth Select
For digital operation be sure S2, S3, and S4 switches, located on the Exciter/Controller
board, all have the #1 switch in the up position, and the rest down. This is for full 50
kHz bandwidth operation required for domestic IBOC broadcast. Narrow-mode AM
utilized in countries other than the USA will find the other filter settings useful to match
their system.
NOTE:
In Table 2-3 below, the number indicates the only switch to be in the UP position.
The other 3 positions on each switch will all be in the DOWN position.
2.3.6.3.1 RMT Digital Present Input
For digital operation the DAX transmitter will need verification that the digital exciter
is indeed online. If your system includes the optional DEXSTAR and ePAL
combination, this will be a +5V signal from the ePAL Exciter Interface output A1J2-10
applied to J7-7 on the External I/O board. DIGITAL PRES RETURN, J7-6, must be
used as the return for the +5V from the ePAL, and be connected directly to an ePAL
ground.
If this signal is not available for your installation, the RMT Digital Present, J7-7, must
be tied to "+5V" at J12-6 on the External I/O board, and the Digital Present Return line
must be connected to a GNDC on the External I/O.
NOTE:
If this line is not held high, the DAX transmitter will revert to Analog mode, and
Digital mode will not be allowed. If this line goes low temporarily, Digital mode
must be re-selected (see "3.3.4 Digital Mode Selection" on page 3-8).
Table 2-3 Bessel Filter Bandwidth Switch Settings
Desired Input
Bandwidth
S2 S3 S4
50 kHz111
10 kHz222
9 kHz333
4.5 kHz 4 4 4