User`s manual
28
Doppler MPT Users Manual
Revision A
IN THIS CHAPTER
Power and Speaker Connection ................................................................... 28
Receiver Connection ......................................................................................... 28
Computer Connection ..................................................................................... 30
NMEA Devices ..................................................................................................... 33
POWER AND SPEAKER CONNECTION
A power and speaker cable is furnished with the DDF7001. The speaker output supports a
standard 8 ohm speaker. The unit is to be powered with an 11 - 14 V dc source. A schematic
of the power cable is shown below.
1
2
CON212
+12VDC
Black
Red
Ground
5 ft end to end
CAB171 (AWG22 GRN)
SPKRhigh
SPKRlow
3
4
1
2
CON271/CON264
1
2CON282
CAB116 (AWG20 RED)
Twisted pair
CAB117 (AWG20 BLK)
CAB172 (AWG22 YEL)
Twisted pair
View from Wiring End.
CON271 is Molex 39012045 receptacle.
CON264 are Molex 39000182 female terminal.
CON212 is Anderson PP15
power pole connector pair.
CON282 is Kobicon 16PJ225-EX
3.5mm mono inline jack.
As shipped, the audio output is configured for a single ended drive with the SPKRlow at
ground. If desired, the output may be reconfigured for bridge drive by moving the jumpers
on headers J13 and J14 to pins 2-3 instead of pins 1-2. The advantage of bridge drive is that
the power output is doubled, but the disadvantage is that approximately 2.5 VDC is present
on both SPKRhigh and SPKRlow and these leads must be kept isolated from ground. J13 and
J14 are located adjacent to the input power connector inside the DDF7001 processor.
RECEIVER CONNECTION
The receiver cable supplied with the DDF7001 is connected to the 6 pin connector labeled
Receiver. The phone plug on the end of this cable connects to the external speaker output of
the receiver. This input is DC isolated from ground so either a single ended or a bridge type
receiver audio output may be connected to the DDF7001. The input impedance is 10 ohms as
supplied. However, if you need a high impedance input, remove the jumper on J1 adjacent to
the receiver connector inside the DDF7001 processor.
Figure 25: Power and Speaker Connections