Cobra Electronics Cobra 148 GTL User Manual
Page 10
18
Section V Maintenance and Adjustment
The COBRA 148GTL transceiver is specifically designed for the environment en-
countered 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. Refer to the schematic diagram and
parts list.
NOTE
If the performance described in the OPERATION and MAINTENANCE
AND ADJUSTMENT sections is not obtained, review the operating instru-
ctions to insure that proper procedures were followed. If a problem still
exists, refer to WARRANTY SERVICE INSTRUCTIONS elsewhere in
this manual.
FCC WARNING
Replacement or substitution of transistors, regular diodes or other parts of
a unique nature, with parts other than those recommended by Cobra,
may cause violation of the technical regulations of Part 95 of the FCC
Rules, or violation of Type Acceptance requirements of Part 2 of the Rules.
Citizens Band (CB) Radio operators are no longer required to obtain an FCC
license to operate their CB equipment or provide station identification.
Nevertheless, an operator of a CB radio station is still required to comply
with the communications act and with the rules of CB Radio Operation.
Section IV Operation (Continued)
Fig. 4. Microphone plug pin numbers viewed from rear of pin receptacle.
Be sure that the housing and the knurled ring of Fig. 3 are pushed back onto the
microphone cable before starting to solder. If the washer is not captive to the pin
receptacle body, make sure that it is placed on the threaded portion of the pin
receptacle body before soldering.
If the microphone jack is used to hold the pin receptacle during soldering opera-
tion, best results are obtained when the connections to pins 1 and 3 are made first
and then the connections to pins 2 and 4. Use a minimum amount of solder and
be careful to prevent excessive solder accumulation on pins, which could cause a
short between the pin and the microphone plug housing.
6.
When all soldering connections to the pins of the microphone are complete,
push the knurled ring and the housing forward and screw the housing onto
the threaded portion of the pin receptacle body. Note the location of the
screw clearance hole in the plug housing with respect to the threaded hole
in the pin receptacle body. When the housing is completely threaded into
the pin receptacle body, a final fraction of a turn either clockwise or coun-
terclockwise may be required to align the screw hole with the threaded hole
in the pin receptacle body. When these are aligned, the retaining screw is
then screwed into place to secure the housing to the pin receptacle body.
7.
The two cable clamp retainer screws should now be tightened to secure the
housing to the microphone cord. If the cutting directions have been carefully
followed, the cable clamp should secure to the insulation jacket of the mi-
crophone cable.
8.
Upon completion of the microphone plug wiring, connect and secure the
microphone plug in the transceiver.
17
3
2
4
1