Alternate Microphones Installation | Cobra Electronics 150GTLDX

Maintenance and Government

Regulatory Information

Your Mobile Radio

Maintenance

•

The transceiver is specifically designed for the environment encountered in mobile installations. The use of all solid-state circuitry and its light weight result in high reliability. Should a failure occur, however, replace parts only with identical parts. Do not substitute.

NOTE

If the performance described in the operation sections is not obtained, review the installation instructions to insure that proper procedures were followed. If a problem still exists, refer to the product service section on page 23.

Government Regulatory Information

•

This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference.

Transmitting using this radio requires an Amateur Radio License. If you live in the United States, visit http://www.fcc.gov or http://www.arrl.org for further licensing information. In Canada, visit http://strategis.ic.gc.ca or http://www.rac.ca/.

Alternate Microphones

and Installation

Your Mobile Radio

Alternate Microphones and Installation

•

For best results, the user should select a low-impedance dynamic type microphone or a transistorized microphone. Transistorized-type microphones have a low output impedance characteristic. The microphone must be provided with a four-lead cable. The audio conductor and its shielded lead comprise two of the leads. The third lead is for receive control, the fourth is for transmit control.

The microphone should provide the functions shown in the schematic below. - -44 Wire Mic Cable

Pin Number	Mic Cable Lead
1	Grounding

2	Audio Lead

3	Transmit Control

4	Receive Control

Fig. 1 Cobra microphone schematic

If the microphone to be used is provided with pre-cut leads, they must be revised as follows.

1.Cut leads so that they extend 7⁄16" beyond the plastic insulating jacket of the microphone cable (see Fig. 2).

2.All leads should be cut to the same length. Strip the ends of each wire 1⁄8" and tin the exposed wire.

Before beginning the actual wiring, read carefully the circuit and wiring information provided with the microphone you select. Use the minimum heat required in soldering the connections. Keep the exposed wire lengths to a minimum to avoid shorting when the microphone plug is reassembled.


16 English		Nothing comes close to a Cobra® 17