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Appendix B: Connecting stereo encoder
You will almost certainly want to upgrade to stereo capability at some point. Using our stereo encoders is a great idea as you
can control all parameters through the same LCD unit used for FM exciter. Since the introduction of the new MaxLink
interconnect system this is really easy to do, you do not have to fiddle with wires and soldering iron anymore. The
MaxLink
TM
is a 6-wire flat cable interconnect system that is simply plugged into appropriate connector on the stereo encoder
board and the other end into connector on FM exciter board. See fig. 19 below for wiring directions. You don’t even have to
wire a separate supply (12V) wire to the stereo encoder as the MaxLink cable delivers supply voltage as well. You still have to
connect audio cable (MPX out to audio input of the FM exciter), but that is really easy to do. It is best to use shielded
microphone cable.
Remember to set the following:
Set the Auto/LCD jumper (J10) on the SE5000 board to LCD (Remove it).
Remove the STEREO/MONO jumper as this is now controlled via FM exciter’s LCD module. If stereo mode LED is
illuminated, you are in STEREO mode.
Disable pre-emphasis in the MAX PRO 50xx+ exciter board (jumper in position “None”). Pre-emphasis is now handled by
stereo encoder(se5000 or other), you can set it there either to 50uS or 75uS.
Set the audio level (P1) on MAX PRO 50xx+ so that the stereo indicator on the radio just turns on, than increase it slightly
more (make sure you are in stereo mode when you do this alignment).
Fig. 20: Connecting stereo encoder to FM exciter.
Appendix
B
