NiCom NT 150 Manuel utilisateur
NT 150 Technical and Maintenance Manual NicomUsa Inc
Page 1
TABLE OF CONTENTS
CHAPTER 1
Transmitter General Description And Installation Procedures Page 2
Remote Control Feature Page 3
Programming the NT 150 Page 5
CHAPTER 2
Electrical & Mechanical Specifications Page 10
Front Panel Description Page 13
Rear Panel Description Page 14
CHAPTER 3
150 W schematics and components list Page 15
NT 150 Technical and Maintenance Manual NicomUsa Inc
Page 2
CHAPTER 1
GENERAL DESCRIPTION
NT 150 Transmitter Exciter
INTRODUCTION
The NT 150 FM Exciter is the latest in state of the art products available from Nicom. This
Transmitter is designed with high reliability components and is intended to give many years of
trouble free continuous service. This unit incorporates many features including a switching power
supply and a PLL frequency synthesizer.
The latest SMD technology has allowed to make a more compact unit (only 2 rack spaces) and
at the same time a very light unit (only 20 lbs).
INSTALLATION
After unpacking the module, check for any mechanical damage or loose parts inside.If there is
any transportation damage, inform the supplier immediately and do not put the module into
operation.
The voltage is applicable from 100 to 240 Volts without needing any change.
Ensure that the station’s ground system connections have a ground resistance of less than 5
ohms. The equipment’s rack or cabinet must be effectively grounded.
Check that the transmitter’s main switch is off.
Connect the power cord to the AC plug.
STARTING PROCEDURE
Connect the antenna cable to the ‘N’ connector on the back of the unit. The antenna system must
be set up to operate at the transmitter’s working frequency.
ATTENTION
Antenna matching is extremely crucial for FM transmitters. Operate this unit only after verifying
good matching. Mismatching will decrease the communication distance and unduly stress the
semiconductors.
Turn on the transmitter.
After 1 or 2 seconds the green LED “PLL LOCK” should turn on. This indicates that the frequency
is locked on the programmed value.
After 1 more second the “RF ENABLE” green LED will come on. This indicates that RF power is
being delivered to the output connector on the back.
Now you can input modulation. For MONO operation connect your signal to the XLR connector
following the connecting instructions printed on the back of the transmitter and then regulate the
input level with the apposite trimmer. For stereo input, use the BNC connector labeled “MPX”.
Regulate the audio with the apposite trimmer.
Note:Be sure that the modulation level is close to but not more than 75KHz. 75KHz is 100%
modulation. Lower modulation level will decrease the S/N value while over-modulation (>100%)
will cause distortion at the receiver and it is against current regulations.
NT 150 Technical and Maintenance Manual NicomUsa Inc
Page 3
REMOTECONTROLFEATURE
The NT 150 is equipped with a 9 pin RS 232 connector that allows all the mains telemetry
functions. The software is supplied with the unit and with this CD rom it's possible to monitor
and to change the main parameters ot the NT 150 on the computer's screen.
The NT 150 is also supplied with the interlock connector that allows to switch the power on and
off simply by grounding the inner conductor of the BNC.
NOTE:
The CD Rom supplied contains the remote control software of the NT 150.
REMOTECONTROLSOFTWARE
INSTALLATION
The NT 150 comes with a Serial port RS 232. This port allows a Bi-Directional remote control of
the unit from a PC.
INSTALLING THE SOFTWARE
1. Insert the NT 150 CD-ROM into the CD drive.
2. Run Setup.exe file found in the main folder of the CD-ROM. The installation will continue
automatically asking only for the name of the folder of the hard drive where the program will
be installed. It will be necessary to reboot the computer.
3. Once installed, the Tx_Nicom program icon can be recalled by clicking : Start - Programs -
Tx_Nicom icon.
CONNECTING THE NT 150
The NT 150 is equipped with a Serial Port (RS232) in the rear panel. To connect the computer
with the NT 150 we recommend standard serial cables Pin-to-Pin; the lenght of the cable must
stay within 60 feet.
REMEMBERTOCLOSETHEPROGRAMBEFORE REMOVINGTHE CONNECTINGCABLE
NT 150 Technical and Maintenance Manual NicomUsa Inc
Page 4
RUNNING THE PROGRAM
Once the program is running, from the main screen it is necessary to click the POWER ON
button; the screen will light up and a message" COMMUNICATION IN PROGRESS" will appear.
After few seconds, on the left side of the screen, the operating frequency will appear together
with all the other parameters. If not, check the Communication port setting (COM1-COM 2).
To change it, click the File menu and then select "set Port".
The other parameters shown on the screen are the following:
1. Temperature in Celsius ( remember that Farheneit is Celsius x 1.8 + 20)
2. Lock Indicator showing that PLL circuit of the unit is locked
3. On the Air showing that the unit is transmitting
4. RF Forward giving the amount of Watts radiated
5. RF Reflected giving the amount of reflected power
On the right side of the screen there are four buttons that allow to modify the parameters:
a. Send Button to be used after a change of frequency is made
b. Set Frequency allows the change of frequency by clicking the new frequency on
the keyboard on the left side of the screen
c. Disconnect allows to disconnect the system
d. RF On turns up and down the power
NT 150 PROGRAMMING
Connect a 50 ohm load or 50 ohm antenna to the RF output, connect the
equipment into a mains supply (100÷240 VAC). The equipment is factory
pre-set to 50 W.
Switch ON the power and the yellow V POWER LED will light.
The Display will show:
SETTING
PROGRAM
WAIT
After 3 seconds the green PLL LOCK led will light and the Display will
show an increasing bar. After a further 5 seconds the green ENABLE will
light and there will be output power.
SETTING
PROGRAM
WAIT
At this point the Display will show the next parameter:
• Level Modulation (MOD > );
• Forward Power (FRW 50.0W);
• Reflected Power (RFL 0.4W).
SETTING
PROGRAM
MOD >
FRW 50W RFL 0.4W
The default frequency is 98.000 MHz.
To display the frequency push the SETTING key.
In order to display the parameter push the SELECT key.
Display Password
The Password mode is factory set to enable, and is not possible change
this setting.
The default password is 1 2 3.
The way for changing the password is the following:
• Press the PROGRAM key for 3 seconds;
• Press the PROGRAM key to move the underscore character position
at the required digit, and press the SETTING key to confirm the digit.
SETTING
PROGRAM
PASSWORD
01 2 3 4 5 6 7 8 9
SETTING
PROGRAM
PASSWORD
0 1 2 3 4 5 6 7 8 9
*
Repeat the same for the two remaining digits.
SETTING
PROGRAM
PASSWORD
0 1 2 3 4 5 6 7 8 9
*
*
*
• If the password is correct press the SETTING key to confirm,
otherwise press the PROGRAM key to select again.
SETTING
PROGRAM
CONFIRM (Y/N) ?
N=SEL. Y=SET.
If the password is not correct an error is displayed:
SETTING
PROGRAM
ERROR
PASSWORD
After a few seconds the display will show the parameters again.
• When the password is correct, the display will show:
SETTING
PROGRAM
NEW PASS . = SET.
NEW FREQ . = PRG
To change the password press the SETTING key.
To change the frequency press the PROGRAM key.
• For changing the password proceed with the same method for the
required password:
SETTING
PROGRAM
NEW PASSWORD
01 2 3 4 5 6 7 8 9
The confirmation password will be required.
SETTING
PROGRAM
CONFIRMATION
01 2 3 4 5 6 7 8 9
If the password is correct the display will show:
If the confirmation password is wrong the display will show:
SETTING
PROGRAM
STORED
NEW PASSWORD
SETTING
PROGRAM
ERROR
CONFIRMATION
IMPORTANT NOTE
! BE CAREFUL !
Once the password is set, it must be remembered, otherwise
neither the frequency nor the password can be reset and the unit
will have to be returned to Nicom for resetting.
Display Change of Frequency.
• Press the PROGRAM key for 3 seconds and enter the correct
password. At this point press again the SELECT key:
SETTING
PROGRAM
NEW PASS . = SET.
NEW FREQ . = PRG
• Press the PROGRAM key to change the desired digit and press the
SETTING key to confirm it.
SETTING
PROGRAM
FREQUENCY ?
MHz 103.900
The underscore character indicates which digit can be change.
To move the underscore character hit the PROGRAM key.
When the new frequency is chosen, then press the SETTING key
confirm it.
After a “WAIT CYCLE”, the display will show the parameters:
SETTING
PROGRAM
MOD >
FRW 50W RFL 0.4W
After 7 minutes the display light will switch off and the display will show:
SETTING
PROGRAM
NICOM
MHz 103.900
NT 150 Technical and Maintenance Manual NicomUsa Inc
Page 10
CHAPTER 2
ELECTRICALSPECIFICATIONS
NT 150 TECHNICAL DATA
Power output: 2 to 150 Watts continuously variable
Frequency of operation: Sinthesized with TXCO crystal reference
RF output connector/ Impedance: Type "N" Female / 50 Ohms
Frequency Stability: Better than 5ppm (
±
500 Hz) , 0 to 50° C.
Frequency Range: 87.5 - 108 Mhz
Frequency programming: Digitally in 10 Khz increments.
Modulation type: Direct FM at the carrier frequency
S/N Ratio (ref. to 50 Khz / 1000 Hz): Mono > 70dB - Stereo > 65 dB.
Distortion, THD: < 0.1 %, Typ. 0.05 %
Asyncronous AM S/N ratio: 65 dB below reference carrier with 100% AM
modulation, 75 usec de-emphasis (no FM
modulation present).
Syncronous AM S/N ratio: 60 dB below reference carrier with 100% AM
modulation (FM modulation
±
75 Khz).
DC input power: 24 V VDC 6 A
AC input power: Single phase 100 - 240 V
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