CableWorld CW-3130 User manual

A HUNGARIAN - AMERICAN LTD. COMPANY FOR MANUFACTURE AND SALES OF CABLE TV EQUIPMENT
CW-3000 PROFESSIONAL
PROGRAMMABLE CABLE TV HEADEND
USER'S GUIDE
TV SOUND MODULATOR
CW-3130
KÁBEL-TV RENDSZEREKET GYÁRTÓ ÉS FORGALMAZÓ MAGYAR-AMERIKAI KFT
CableWorld Ltd. H-1116 Budapest, Tel + 36 1 204 7815
Kondorfa u. 6/B. Fax + 36 1 204 7839
Hungary E-mail: [email protected]
Internet: www.cableworld.hu

1
TV SOUND MODULATOR CW-3130
Dear User!
Thank you for your trust in our company, ex-
pressed by buying our product. We believe your new
equipment will meet your requirements and it will jus-
tify your decision through trouble-free operation.
We would like to support you in your work, by
summarizing all the instructions connected with the
installation and use of the unit.
MECHANICAL CONSTRUCTION
The TV SOUND MODULATOR is accomodated
in a standard 1 unit high 19" rack cabinet. The unit is
delivered along with the following accessoires:
1. Cabinet leg 4 ea
2. Fuses T0.4 A (slow) 1 ea
M0.63 A (medium) 1 ea
If the unit is to be built into a rack cabinet, the legs
would impede, therefore they should not be mount.
In the rack cabinet, the TV SOUND
MODULATOR should be placed above the respective
TV MODULATOR. Both units together build a stan-
dard TV modulator with two sound carrier system. In
order to assure the proper ventilation, the channel proc-
essor unit pairs should always be separated by a vented
front plate.
When using as a table-top unit, snap the cabinet
legs into the four holes in the bottom plate. The legs
also prevent the units from slipping down when put
onto each other.
To replace the internal fuse or to remove the legs,
after unscrewing the fixing screws, the cover plate can
be taken off.
ELECTRICAL CONSTRUCTION
Input signals of the TV SOUND MODULATOR:
• L, A (left channel or program A), RCA socket
• R, B (right channel or program B), RCA socket
• video, BNC socket
• external vision IF signal, F-type socket
Output signal of the TV SOUND MODULATOR:
• Standard IF signal with two sound carriers and a
pilot signal locked in phase to the video line sync.
The output connector is an F-type socket.
The connections have to be made with high quality,
low attenuation cables. These cables and cable sets are
included in our product range, too.
In the basic configuration, the unit is composed of:
• mains power supply,
• control unit,
• A2 encoder and modulator unit.
All the units of the CW-3000 series headend incor-
porate an own switched mode power supply. This
power supply is accomodated in the right side of the
unit, under a shielding cover and delivers six supply
voltages: +5V, +8V, +12V, +24V, +40V and -12V. The
mains fuse is mounted on the unit's rear plate.
The secondary fuse is accessible within the unit,
after removing the fuse cover. When replacing a fuse,
the replacement must be of the specified type and rat-
ing!
The simple way of operation and the easy setting of
the parameters is facilitated through a microprocessor
based control unit. To this control unit, the
PROGRAMMER (CW-3081) can be connected
through a front plate socket. The PROGRAMMER
permits checking and/or programming the parameters
of the unit.
On the front plate, two rows of LEDs give informa-
tion on the operation of the unit and the actual settings.
More detailed see in the section "PROGRAMMING".

2
TV SOUND MODULATOR CW-3130
PROGRAMMING
After having installed the unit, programming can
be started. Connect the PROGRAMMER to the 6-pin
socket on the front plate. After the short display of "no
co" (no connection), the operation mode of the unit is
displayed. Any other display or flashing indicates some
fault in functioning. In this case consult the PRO-
GRAMMER's manual that gives further useful informa-
tion on programming, too.
• With the PROGRAMMER, the programmable pa-
rameters, as menu items, can be stepped round. This
guide describes the setting of the parameters in the
sequence of their appearance in the menu. (The TV
SOUND MODULATOR has only one porgramma-
ble parameter.)
• The desired numeric values can be set by stepping
fast or slowly, or they can be set directly from the
numeric keyboard. In this latter case the command
has to be closed by pushing the ENTER button.
• The values having been set in the programming
procedure, can be stored by pushing the STORE
button. Without this, after disconnecting the
PROGRAMMER, these values go lost and the for-
mer values become valid.
SETTING THE OPERATIONAL
PARAMETERS OF THE TV SOUND
MODULATOR
1. Combining the IF signals and adjusting their levels
The vision IF signal (not including the sound car-
rier) of 102 dBmV nominal level on 75 ohms is to be
led to input IF IN on the rear panel. The sound carrier
of the TV MODULATOR must be switched off. With
CW-3000 series TV MODULATORs, this can be done
from the PROGRAMMER: choose the function SCA
(Sound CArrier) in the menu, set its value to 0 then
STORE this setting.
The external IF vision carrier and the internal two
sound carriers will be combined in a directional coupler
within the TV SOUND MODULATOR. In the IF sig-
nal at output IF OUT, the main sound carrier will be
included at -13 dB level and the second sound carrier at
-20 dB, related to the peak value of the vision carrier. In
some cases the user cannot supply the vision IF signal
at its nominal level to the TV SOUND MODULATOR.
If the difference is not more than several dB, both
sound carriers can be adjusted together, using an inter-
nal potentiometer. There is also provision for the indi-
vidual adjustment of the sound carriers for larger differ-
ences of the vision carrier to its nominal value.
These settings should only be made with proper meas-
uring equipment available. In other case please contact
the manufacturer. The locations of the internal adjusting
potentiometers are shown in table 1.
2. Choosing the operational mode
The two sound carrier type modulators can be operated
in one of three modes. In the PROGRAMMER menu,
they appear as follows:
SEL (SOUND SELECT)
1 - MONO
2 - STEREO
3 - DUAL SOUND
You only need to key in the proper value and to
STORE it. The STEREO and DUAL SOUND modes
are indicated by separate LEDs in the front plate LED
row.
3. Adjusting the FM deviations
The deviations of the FM channels can be adjusted with
screw-driver potentiometers on the front plate. The
deviations can be read from the LED row with suffi-
cient accuracy. Possible overmodulation (dF ≥35 kHz)
is signalized with a red LED.
4. Options
The CW-3130 TV SOUND MODULATOR (along
with the respective TV MODULATOR) outputs an IF
tv signal with stereo sound according to the B/G-
version German two sound carrier system.
On request, the unit can be delivered in versions for
other two sound carrier systems (6.5/6.26 MHz Czech
system, etc.), too.
GENERAL INFORMATION
In the course of using the unit, the identification of
type number and/or the serial number of the unit may
be required. These data can be read in the sticker on the
unit's bottom side or can be queried by the
PROGRAMMER. To display the type number push F1,
to display the serial number push F2.
The unit needs no particular servicing.

3
TV SOUND MODULATOR CW-3130
SPECIAL INFORMATION
The circuitry of the CW-3130 TV SOUND
MODULATOR is controlled by I2C bus. In order to
avoid troubles due to possible power cuts or other dis-
turbances, the required data are fed to the integrated
circuits in regular intervalls. The refreshing frequency
can also be programmed according to the followings:
- push buttons ERROR and CLEAR simulta-
neously, to enter the second menu system. This mode is
signalized with underscored characters in the display.
- Choose item "rt" (REFRESH TIME).
- The refreshment time is 2.5 s at value 8. On
decreasing this value by one, the refreshment time be-
comes double. With value 1, it is more than 5 minutes.
- Push buttons ERROR and CLEAR simulta-
neously, to leave the second menu system.
The units of the CW-3000 series are suitable
of being remote controlled by personal computer. In
this case, each of the units must have an individual
address. This address can be set in the second menu at
menu item "Ad" (ADDRESS), between 1 and 99. The
address permits also the identification of the individual
unit.
The PROGRAMMER can also be used for
quick location of possible faults of the unit. Push
ERROR to display the error code, then locate the fault
using the manual of the PROGRAMMER.
Attention: the circuitry of the unit is protected against
copying. Therefore, modifications in the internal con-
trol may cause the normal operation being inhibited.
Dear User!
The necessary skill in programming this unit can only
be achieved through trying the particular functions in
practice. We hope this guide will be helpful to you in
this effort.
Should you face any problems at using the unit, our
experts are at your disposal any time.
Table 1
Locations of the potentiometers for adjusting the carrier levels

4
TV SOUND MODULATOR CW-3130
Technical data
Input data
IF INPUT
Input impedance 75 ohms
Nominal frequency 38.9 MHz
Input connector F-type socket
Nominal input level 102 dBµV
Video input bridged (high impedance input)
Nominal input level 1 Vp-p
Connector type BNC socket
Output data
IF OUTPUT
Output impedance 75 ohms
Nominal frequency (38.9) / 33.4 / 33.158 MHz
(B/G-version German two carrier system)
Connector F-type socket
Nominal output level (102) / 89 / 82 dBµV
Video output bridged (high impedance output)
Nominal terminating impedance 75 ohms (external terminator to be used)
Connector type BNC socket
Operating modes
STEREO CH1= (L+R)/2
CH2= R + pilot
Pilot modulation 117.5 Hz / 50% AM
DUAL SOUND CH1= program A
CH2= program B
Pilot modulation 274.1 Hz / 50% AM
MONO CH1= program A
CH2= program B
Pilot modulation unmodulated
Pilot signal
Frequency (54.6875 kHz) 3.5 fH, locked to the input video
Transmission on the second sound carrier (CH2)
Modulation FM / 2.5 kHz deviation
Nominal deviations of the sound carriers
Factory setting 30 kHz / 0 dBm
At operation 30 kHz or 50 kHz
(according to user setting)

5
TV SOUND MODULATOR CW-3130
Displays
Deviations in CH1 and CH2 two LED rows
accuracy at 30 kHz deviation + 3 kHz
Mode stereo, dual sound
Programmable parameter operational mode (MONO, STEREO, DUAL)
Options On request, the unit can be delivered in versions for other two sound
carrier systems (6.5/6.26 MHz Czech system, etc.)
General data
Service period continuous
Mains voltage 230 V / +10 ... -15 %
50/60 Hz
Power consumption max. 50 V
Dimensions
Width 483 mm
Height 43.6 mm
Depth 473 mm
Mass appr. 4 kg
Operational temperature range
to fulfil the specs +10.....+35 oC
to maintain operation 0.....+40 oC
Interconnection of the TV modulator and the CW-3130 TV SOUND MODULATOR