NiCom NT3K Manuale utente
NT3K - NT5K
MEDIUM/HIGH POWER
FM BROADCAST TRANSMITTER
SERVICE MANUAL
1 - RF SAMPLER 1000WOUT = +10dBm
2 - POWER STAGE SUPPLY CORRECT OPERATION YELLOWINDICATOR
3 - PLL LOCK FREQUENCY CONTROL CORRECT OPERATION CIRCUIT GREEN INDICATOR
4 - PRESENCE OF RF POWER AT FREQUENCY SET ON OUTPUT CONNECTOR GREEN INDICATOR
5 - RF OUTPUT POWER ADJUSTING FROM 0 TO OVER 3000W
6- LCD MULTIMETER DISPLAY SHOWING:
- operational frequency
- modulation
- forward rf power
- reflected power
7 - 8 - THESE PUSH BUTTONS ALLOWTO TO SELECT ON LCD DISPLAY THE FOLLOWING MENU:
- display parameter
- password
- change of operational frequency
1 - RF SAMPLER 1000WOUT = +10dBm
2 - POWER STAGE SUPPLY CORRECT OPERATION YELLOWINDICATOR
3 - PLL LOCK FREQUENCY CONTROL CORRECT OPERATION CIRCUIT GREEN INDICATOR
4 - PRESENCE OF RF POWER AT FREQUENCY SET ON OUTPUT CONNECTOR GREEN INDICATOR
5 - RF OUTPUT POWER ADJUSTING FROM 0 TO OVER 3000W
6- LCD MULTIMETER DISPLAY SHOWING:
- operational frequency
- modulation
- forward rf power
- reflected power
7 - 8 - THESE PUSH BUTTONS ALLOWTO TO SELECT ON LCD DISPLAY THE FOLLOWING MENU:
- display parameter
- password
- change of operational frequency
NT3-5K FRONT PANEL LAYOUT
TITLETITLE
DATEDATE DRAWING NO.DRAWING NO.
NT 3K-5K FM TRANSMITTER
front panel layout
NT 3K-5K FM TRANSMITTER
front panel layout
05-201405-2014 NT3-5K Front panel layout 1.cdrNT3-5K Front panel layout 1.cdr
11
2233445566
7788
TITLETITLE
DATEDATE DRAWING NO.DRAWING NO.
NT 3K-5K FM TRANSMITTER
rear panel layout
NT 3K-5K FM TRANSMITTER
rear panel layout
05-201405-2014 NT3-5K 3Phases Rear panel layout.cdrNT3-5K 3Phases Rear panel layout.cdr
1 - MAIN SUPPLY CABLE
2-3 - FANS
4 - EARTH GROUND CONNECTING
5 - DB 9 PIN INPUT / OUTPUT CONNECTOR FOR TELEMETRY ( opt.01 )
6-7- BNC FEMALES FOR SUBCARRIERS GENERATORS INPUTS
8-9- SCA INPUT ADJUSTING LEVELS
10-11 - COUPLE BNC FEMALE BALANCED MODE MONO AUDIO INPUT
12 - MONO INPUT ADJUSTING LEVEL
13 - BNC FEMALE FOR THE COMPOSITE MPX INPUT
14 - MPX INPUT ADJUSTING LEVEL
15 - 7/8” FEMALE FOR RF OUTPUT POWER
16 - THREE PHASES MAINS SWITCH
11
2233
44
55
6677
8899
1010 1111
1212
1313
1414
1515
1616
Environmental Conditions for the Installation
Every piece of equipment manufactured by Nicom has been carefully
designed and tested in order to be in compliance with the International
Normative.
The reported marks placed on the rear panel and in the manual are
relevant to the tests realized on the equipment in accordance with the
rigorous safety criteria advised by the Country where the equipment will
operate.
Some tests require that the equipment be able to withstand specific and
very severe environmental conditions for a brief period of time.
Although the equipment is actually able to operate properly even under
severe conditions, they should not be considered as normal, and
therefore, cannot be applied neither permanently nor for long periods of
time.
The equipment has been designed for lasting duration, provided it
operates under correct/standard environmental conditions.
In other words, the equipment can withstand extreme environmental
conditions for a limited period of time while operating in compliance with
the quality figures advised in the technical data-sheet.
The environment where the equipment operates should be dry and free
of dust; the ambient temperature must be within the range advised by the
manufacturer.
No material such as rope, insulating material, or clothing should cover
the equipment at any time. Make sure that nothing can somehow reduce
the regular cooling air flow through the equipment. Before operating the
equipment, make sure that all the recommendations reported in the
manual in section 04, (“Placing the equipment in operation”) are fully
complied with.
In this section, the data concerning the room size where the equipment
should operate are intended as minimum figures, sufficient to keep the
internal parts of the equipment perfectly cooled.
In case there should be more equipment in the same transmitter
enclosure/room, it will be necessary to install an air conditioning system
to ensure the recommended operational conditions. In case the minimum
operational and safety conditions are not complied with, the
manufacturer will not be liable for any damages or inconveniences that
may occur, and the warranty will be void.
Maintenance and Cleanliness
Routine maintenance and cleaning should only take place when the
equipment is not connected to the mains. Disregarding this caution,
may cause problems and affect your personal safety.
For no reasons, the equipment should come in contact with water or
other liquids.
To clean the equipment, use only a soft cloth. In cases where a lot of
dust accumulates inside the equipment, use a vacuum-cleaner or a dry
soft brush to remove it.
The routine maintenance of the equipment is also intended as the
periodical control of the operational parameters. Please follow the
instructions written in the chapter “Placing in Operation”.
INSTALLATION
The installation of any electrical equipment should be always made
by trained technicians, who are supposed to be aware of the risks related
to the connection to an electrical supply.
Before proceeding to the installation, it is mandatory to verify that the
general electrical supply is fully in compliance with the normative of the
Country where the equipment will operate.
In the rear panel of the equipment, the requested electrical features of
mains are reported.
The utmost attention should be devoted to the grounding system
of the mains: a good grounding system grants the personal
safety of the technical personnel in case of stray currents due to static
voltages accumulated in the equipment.
Before proceeding to any operations, we strongly recommend to make
sure that an adequate and certified grounding system has been set.
In case of disregard of the above mentioned recommendations, the
manufacturer does not take any responsibilities about damages to
persons and materials.
The ambient where the equipment will be situated is very important.
It should be a dry place big enough to allow a good air circulation.
Any materials or objects should be placed at a distance of at least 2 feet
from the cooling air ducts of the equipment. This will assure the regular
cooling conditions of the heat-sink of the equipment.
Disregarding the above recommendations could bring damages to the
internal components and increase the risk of fire.
Make sure that the equipment is placed in a stable and secure position,
to easily allow the access to the front panel and to the rear panel too.
This will permit in the future a simple and fast inspection of the
connections if necessary.
At first connect the transmitting antenna cable to the EIA 7/8 connector
placed in the rear panel; then connect the power cord to the mains.
Verify that the circuit breaker has an appropriate size for the current
required. (220V single phase circuit breaker should be 50A).
After having checked all this you can now put the unit in operation.
Turn on the main switch and allow the unit to cycle till the “enable” light is
on. This means that the unit is ready to deliver power.
We recommend to test the unit on a Dummy load before connecting to
an antenna. This will allow to fully test the unit and verify the parameters.
Once that an hour test has been performed on a Dummy Load, then you
can be confident that the unit has not been damaged during the
transportation and that all the parameters are ok.
Once that you connect the transmitter to the antenna, you must be sure
that the antenna system can handle the power continuously. This means
that if you have a nominal 10 KW antenna system, it would be safe to put
8 KW of power in it. Remember that the antenna system is working
outside in an hostile environment and the time passing will deteriorate
the performances of the system itself. That is why we advise a 20%
margin between the nominal power and the effective power.
Once that everything has been verified, you can slowly increase the
power up to 20% (in case of the NT5000 up to 1000W). Leave this level
of power for about 20 minutes to allow all the parts to warm up and to
verify that in antenna the performances are almost the same that on the
Load. After that time and after verifying that the reflected power is ok,
you can increase the power up to 50% (2500W). Follow the same
procedure for another 20 minutes; if after that period everything look
normal (reflected power, air flow temperature, ambient temperature etc.)
then you can set your unit at the operating power. Wait another 20
minutes before leaving the site.
Safety
Read this chapter carefully before installation and use of the equipment.
Introduction
The equipment described in this manual, has been designed for use
by properly trained personnel only.
Adjustment, maintenance and repair of the exposed equipment should
only be carried out by qualified personnel who are aware of hazards
involved.
Safety Precautions
For the correct and safe use of the equipment, it is essential that both
operating and servicing personnel follow generally accepted safety
procedures in addition to the safety precautions specified in this manual.
Specific warning and caution statements, where applicable, are found
throughout this manual. Note that warning and caution statements and/or
symbols are marked on the equipment as well.
This manual provides technical information important for safe operation
of the equipment.
Please refer to the relevant sections of the manual for technical
specifications, installation and operating instructions.
Special attention must be paid to the following issues:
♦
Protective grounding of the instrument is required for the ac-
cessible terminals to be safe.
(IEC 1010-1 Safety class I instrument)
♦
The actual environmental conditions must be checked
against the specification
♦
Mains voltage must be inside the specified range
The opening of covers or removal of parts, except those to
which access can be gained by hand, is liable to expose live
parts and terminals.
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