External Devices
And Connections
Nothing Comes Close to a Cobra
®
23
22 English
External Devices
And Connections
External Devices And Connections
•
Your CobraMarine VHF radio is set up to connect auxiliary devices for navigation,
convenience, and added versatility. As is the case with the antenna, choosing these
devices is best done with the advice and guidance of a knowledgeable dealer.
Standard connectors are provided on the front and back of the transceiver.
External Speaker (Not Included)
An
External Speaker
can provide greater volume to hear messages than the speaker
incorporated in the CobraMarine microphone/speaker.
To Install An External Speaker:
1.
Connect the wires to the External Speaker as follows:
Orange wire - +Positive connection
Black wire - -Negative connection (Black wire is common shared -Negative for
the External Speaker and PA output)
2.
Make sure to solder, crimp, or twist the wires together firmly and use shrink
tubing or electrical tape to waterproof the connection.
Public Address Speaker (Not Included)
At times, it may be handy to hail other boats or give instructions to line handlers
on the dock. Your CobraMarine VHF radio can be switched to operate in the
Public
Address
mode through an attached PA speaker.
To Install A Public Address Speaker:
1.
Connect the wires to the External Speaker as follows:
Red wire - +Positive connection
Black wire - -Negative connection (Black wire is common shared -Negative for the
External Speaker and PA output)
2.
Make sure to solder, crimp, or twist the wires together firmly and use shrink
tubing or electrical tape to waterproof the connection.
Installation And Start-Up
Installation And Start-Up
Wiring Located at Back
of Radio
Wiring for External and
Public Address Speakers
Global Positioning System (GPS) Device
Your Cobra Marine radio includes a built-in GPS receiver. Your position will be
continuously indicated on the LCD and, most importantly, it will be included
automatically with any DSC Distress message you may need to send. That will take the
“search” out of “search and rescue”.
An external GPS input connector has been provided to allow connection to a
back-up GPS receiver.
To Install an External GPS Device:
1.
Install the GPS device in a convenient location according to its manufacturer’s
directions.
2.
Plug-in the optional Cobra C.P.S. (Cobra Positioning System) into the provided
2.5mm jack.
3.
Or using the supplied 2-wire adapter wire as follows:
Yellow wire - NMEA 0183 + Data in
Green wire - NMEA 0183 - Data in.
NOTE
Satellite acquisition time is dependent on the antenna mounting location. If the
acquisition takes too long, relocate the radio or use an external GPS receiver.
NOTE
GPS data input is as follows:
• Input voltage (peak to peak): 10V
• Maximum data rate: 4800 baud
• Impedance: 4KΩ
Wiring Located at Back
of Radio
Cobra Positioning
System Plug
GPS Interface Cable
MRF77E_MANL_INSTALL.indd 32-33
5/7/15 2:49 PM
