Connex 4600 TURBO User manual

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CONNEX — 4600 TURBO
OWNER'S MANUAL
Full Channel AM/FM
Amateur Mobile Transceiver
Printed in Malaysia
AT 1 48N030B

TABLE OF CONTENTS
PAGE
SPECIFICATIONS 
2
INSTALLATION 
3
LOCATION 
3
MOUNTING THE RADIO 
3
IGNITION NOISE INTERFERENCE

4
ANTENNA 
4
TUNING THE ANTENNA FOR OPTIMUM S.W.R..
5
EXTERNAL SPEAKER

6
OPERATION 
7
CONTROLS AND INDICATORS

7
Front Panel 
7
Rear Panel Connectors

9
Microphone 
10
Procedure to Receive

11
Procedure to Transmit 
11

TRANSMITTER
RF Power Output

AM/FM:
SOW
Spurious Emission

-50dB
Audio Distortion

10%
Fre°uency Response

300 to 2500Hz
Microphone

Dynamic
RECEIVER
Sensitivity
AM 0.5 uV for 10dB S+N/N
FM 0.25 uV for 12dB S+N/N
S°uelch Sensitivity

0.5uV
Selectivity

-50dB
Image Rejection

-50dB
Hum & Noise

40dB
Audio Output Power

2.5W at 10%THD
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
SPECIFICATION

INSTALLATION
GENERAL
Model
Frequency Range
Modes
Frequency Control
Frequency Stability
Temperature Range
Input Voltage
Antenna Impedance
Size
CX-4600TURBO
28.015 28.585 MHz
AM/FM
Phase-Locked-Loop Synthesizer
0.001%
0°C to +50
C C
DC 13.8V
50 Ohms
7 7/8"(W) x 10 3/4"(D) x 2 3/8"(H)
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 drive or passengers in the automobiles, the transceiver
is usually mounted the dash panel with the microphone bracket beside it.
MOUNTING THE RADIO
The transceiver 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:
Weight

5.Olbs
1.
After you have determined the most convenient location in your vehicle,
hold the transceiver 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 transceiver 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 prevent 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 the right side of the transceiver, using
two screws supplied. When mounting in an automobile, place the
bracket under the dash so that microphone is readily accessible.

IGNITION NOISE INTERFERENCE
Use of a mobile receiver at low signal levels is normally limited by the
presence of electrical noise. The primary source in automobile installation is
from the generator and ignition system in the vehicle. Under most operating
conditions, when signal level is adequate, the background noise does not
present a serious problem. Also, when extremely low level signals are being
received, the transceiver may be operated with vehicles engine turned off.
The unit requires very little current and therefore will not significantly
discharge the vehicle battery.
In some installation ignition interference may be high enough to make
good communications impossible. The electrical noise may come from
several sources. Many possibilities exist, as variations between vehicles
require different solutions to reduce the noise.
ANTENNA
A vertically polarized, quarter-wavelength whip antenna provides the most
reliable operation and greatest range. Shorter, loaded-type whip antennas are
more attractive, compact and adequate for applications where the maximum
possible distance is not required. Also, loaded whips do not present the
problems of high wind resistant imposed by a full quarter-wavelength whip.
Mobile whip antennas utilize the metal body of the vehicle as a ground
plane. When mounted at a corner of the vehicle they are slightly directional,
in the direction of the body of the vehicle. For all practical purpose,
however, the radiation pattern is nondirectional. The slight directional
characteristic will be observed only at extreme distances. A standard
antenna connector (type So-239) is provided on the transceiver for easy
connection to a standard PL-259 cable termination.
If the transceiver is not mounted on a metal surface, it is necessary to run a
separate ground wire from the unit to good metal electrical ground in the
vehicle. When installed in a boat, the transceiver will not operate at
maximum efficiency without a ground plate, unless the vessel has a steel
hull.
Before installing the transceiver in a boat, consult your dealer for
information regarding an adequate grounding system and prevention of
electrolysis between fittings in the hull and water.
TUNING THE ANTENNA FOR OPTIMUM S.W.R
Since there is such a wide variety of base and mobile antennas, this section
will strictly concern itself to the various types of mobile adjustable antennas.
Because the antenna length is directly related to the channel frequency, it
must be tuned to resonate optimally on all channels of the transceiver.
Channel 1 requires a longer antenna than Channel 40 because it is lower in
its frequency of operation. Due to the various methods of adjusting antennas
for proper S.W.R. we have chosen what we think is the optimum method:
A. Antenna with adjustment screws (set screws).
1.
Starts with the antenna extended and tighten the set screw lightly enough
so that the antenna can be lightly tapped with your finger for easy
adjustment.
2.
Set your transceiver to Channel 20. Press the PTT (push-to-talk) switch,
and tap the antenna (making it shorter). The S.W.R meter will show a
lower reading each time the antenna is tapped. By continuing to shorten
the antenna, you will notice the S.W.R reading will reach a low point
and then start rising again. This means that you have passed the
optimum point for Channel 20.
Extend the antenna a short distance and again follow the procedure above.
When the lowest point has been reached, switch to Channel 1 and then to
Channel 40 and compare S.W.R
readings. They should be almost equal.
B. Antennas which must be cut to proper length
1.
Follow the same procedure as above but adjust the length by cutting in
1/8" increments until a good match is obtained.
2.
Be very careful not to cut too much at one time, as one it is cut, it can no
longer be lengthed.

I -
NOTE
The proper setting is achieved when the SWR is 1.5 or
below, and when it has the same reading for channels
land 40.
r
NOTE
The transceiver will operate into an SWR
of 2 to 1
indefinitely and sustain an SWR
of
20 1
for a
maximum
of
5 minutes at rated operating conditions.
3. The whip is easily cut by filing a notch all the way around and breaking
the piece off with pliers.
If you're having difficulties in adjusting your antenna, check the following:
a.
All doors must be closed when adjusting the antenna
b.
Make sure the antenna base is grounded.
c.
Check your coaxial cable routing (it may be pinched when routed into
the car)
d.
Try a different location in your ca r (keeping in mind the radiation
pattern you wish.)
e.
Is the antenna perfectly vertical?
f.
Try a different location in your neighborhood. Stay away from large
metal objects when adjusting (metal telephone polls or light post, fences,
etc.)
EXTERNAL SPEAKER
The external speaker jack (EXT SP.) on the rear panel is used for remote
receiver monitoring. The external speaker should have 8 ohms impedance
and be able to handle at least 4 watts. When the external speaker is plugged
in, the internal speaker is disconnected.
OPERATION
CONTROLS AND INDICATORS
Front Panel
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1. MICROPHONE JACK
: Used to connect microphone for voice source.
2. ON/OFF VOLUME CONTROL:
Turn clockwise to apply power to
the radio and to set the desired listening level.
3.
SQUELCH CONTROL: This control is used to eliminate background
noise being heard through the receiver which can be disturbing when no
signal is being received. To use this feature of your radio, gently turn the
switch fully counterclockwise and then turn clockwise until the
background noise is just eliminated. Further clockwise rotation will
increase the threshold level so that only strong signals will be heard.
4. MIC GAIN CONTROL: Adjust the microphone gain in the transmit
and PA modes. This controls the gain to the extent that full talk power is
available several inches away from the microphone. In the Public
Address (PA) mode, the control functions as the volume control.
-6-

-7-

5. RF GAIN CONTROL: This control is used to reduce the gain of the
RF amplifier under strong signal conditions.
6. RF POWER CONTROL: This control enables adjustment of RF
power output continuously up to the rated out power.
7.
BAND SELECTOR:
This switch selects A, B, C, D, E or F band of
operation.
8. E-TONE CONTROL
: This control is used for echo effect and
intervals of echo sound.
9. CHANNEL SELECTOR
: This control is used to select a desired
transmit and receive channel.
10. FRONT PANEL METER:
The front panel meter allows the user to
monitor signal strength and RF output power level.
11. MODE SWITCH
: This switch allows you to select one of the
following operating modes: AM/FM/PA.
12.
NB/ANL /OFF SWITCH
: In the NB/ANL position, the RF Noise
Blanker and the automatic Noise Limiter in the audio circuits are also
activated. The Noise Blanker is very effective in eliminating repetitive
impulse noise such as ignition interference.
13. +10Khz/OFF SWITCH
: In the +10KHz position, the transmit and
receive frequency is shifted 10KHz up.
14. T.B./OFF SWITCH
: This switch is used to monitor the sound
feedback effects.
15. TX/RX LED:
The red LED indicates the units is in the transmit mode.
The green indicates the units is in the receive mode.
16. CHANNEL DISPLAY:
This channel display indicates the current
selected channel.
Rear Panel Connectors
000
00
1. ANTENNA: This jack accepts
50
ohms coaxial cable with a PL-259
type plug.
2.
PA. SP.:
This jack is used for PA operation. Before operating, you must
first connect a PA speaker (8 ohms, 4W) to this jack.
3. POWER : This accepts 13.8V DC power cable with built-in fuse. The
power cord provided with the radio has a black and red wire. The black
goes to negative and the red goes to positive.
4. EXT SP.: This jack accepts 4 to 8 ohm, 5
watts external speaker. When
the external speaker is connected to this jack, the built-in speaker will be
disabled.
5. F.C.: This jack is used to connect the optional Galaxy FC-390 six-digit
frequency counter. All connections, including DC power, are provided
to the Galaxy FC-390 through this jack.
-8--

-9-

Pin Number
1
2
3
4
Mic Cable Lead
Audio Shield
Audio Lead
Transmit Control
Receive Control
PROCEDURE TO RECEIVE AND TRANSMIT
A.
MICROPHONE
The receiver and transmitter are controlled by the push-to-talk switch on
the microphone. Press the switch and the transmitter is activated, release
switch to receive. When transmitting hold the microphone two inch from the
mouth and speak clearly in a norma 1 "voice". The transceiver come
complete with low-impedance dynamic microphone.
For best result, the user should select a low-impedance dynamic type
microphone or a transistorized microphone.
The microphone should provide the functions shown in schematic below.
4 WIRE MIC CABLE
B. PROCEDURE TO RECEIVE
1.
Be sure that power source, microphone and antenna are connected to the
proper connectors before going to the next step.
2.
Turn VOL knob clockwise to apply power to the radio.
3. Set the VOL for a comfortable listening level.
4. Set the MODE switch to the desire mode.
5. Listen to the background noise from the speaker. Turn the SQ knob
slowly clockwise until the noi se just disappears. This SQ is now
properly adjusted. The receiver will remain quiet until a signal is
actually received. Do not advance the control too far or some of weaker
signals will not be heard.
6.
Set the CHANNEL selector switch to the desired channel.
7.
Set the RF GAIN control filly clockwise for maximum RF gain.
C. PROCEDURE TO TRANSMIT
1. Select the desired channel of transmission.
2. Set the MIC GAIN control fully clockwise.
3.
If the channel is clear, depress the push-to-talk switch on the
microphone and speak in a normal voice.
Microphone Schematic Diagram