Section Iii Installation - Cobra HH36ST Operating Instructions Manual

Section II Specifications (Cont.)
RECEIVER
Sensitivity
Selectivity
Image Rejection
IF Frequency
Adjacent-Channel Rejection
AM and SSB RF Gain Control
Automatic Gain Control (AGC)
Squelch
ANL
Noise Blanker
Voice Lock Range
Audio Output Power
Frequency Response
Built-in Speaker
External Speaker (Not Supplied)
PA SYSTEM
Power Output
External Speaker for PA
(Not Supplied)
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
SSB: 0.25 µV for 10dB (S+N)/N at greater than
1/2-watt of audio output.
AM: 0.5 µV for 10 dB (S+N)/ at greater than 1/2-
watt of audio output.
AM: 6dB @ 3 KHz, 50 dB @ 9 KHz.
SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz.
More than 65 dB.
AM: 7.8 MHz 1st IF, 455 KHz 2nd IF.
SSB: 7.8 MHz.
60 dB AM & 70 dB SSB.
40 dB adjustable for optimum signal reception.
Less than 10 dB change in audio output for
inputs from 10 to 100,000 microvolts.
Adjustable; threshold less than 0.25 µV.
Switchable.
RF type, effective on AM and SSB.
±2.5 KHz.
4 watts into 8 ohms.
300 to 2500 Hz.
4 ohms, round.
8 ohms; disables internal speaker when
connected.
4 watts into external speaker.
8 ohms.
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Section III Installation

LOCATION
Plan the location of the transceiver and microphone bracket before starting the
installation. Select a location that is convenient for operation and does not
interfere with the driver or passengers in the vehicle. In automobiles, the
transceiver is usually mounted below the dash panel, with the microphone
bracket beside it.
MOUNTING THE CONNECTION
The COBRA 148GTL is supplied with a universal mounting bracket. When
mounting the bracket and radio to your car, make sure it is mechanically strong.
Also provide a good electrical connection to the chassis of the vehicle. Proceed as
follows to mount the transceiver:
1. After you have determined the most convenient location in your vehicle, hold
the COBRA 148GTL with mounting bracket in the exact location desired. If
nothing will interfere with mounting it in the desired position, remove the
mounting bolts. Before drilling the holes, make sure nothing will interfere with
the installation of the mounting bolts.
2. Connect the antenna cable plug to the standard receptacle on the rear panel.
Most CB antennas are terminated with a type PL-259 plug and mate with the
receptacle.
3. Connect the red DC power input wire (with the fuse) to +13.8V DC. This wire
extends from the rear panel. In automobile installation, +13.8V DC is usually
obtained from the accessory contact on the ignition switch. This prevents the
set being left on accidentally when the driver leaves the car and also permits
operating the unit without the engine running. Locate the accessory contact on
most ignition switches by tracing the power wire from the AM broadcast
receiver in the car.
4. Connect the black lead to -13.8V DC. This is usually the chassis of the car. Any
convenient location with good electrical contact (remove paint) may be used.
5. Mount the microphone bracket on either side of the transceiver, using the two
screws supplied. When mounting in an automobile, place the bracket under
the dash so the microphone is readily accessible.
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