Genius NT 250 manual

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 1 T ABLE OF CONTENTS CHAPTER 1 Transmitter General Description And Installation Procedures Page 2 Remote Control Feature Page 3 Programming the NT 250 Page 5 CHAPTER 2 Electrical & Mechanical Specifications Page 10 Front Panel Description Page 13 Rear Panel Description Page 14 CHAPTER 3 [...]

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 2 CHAPTER 1 GENERAL DESCRIPTION NT 250 T ransmitter Exciter INTRODUCTION The NT 250 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.[...]

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 3 REMOTE CONTROL FEATURE The NT 250 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 250 on the computer's screen[...]

NT 250 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 appe[...]

NT 250 PROGRAMMING Connect a 50 ohm load or 50 ohm antenna to the RF output, c onnect 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: After 3 seconds the gree n PLL LOCK led will lig ht and the Display will show an increasin[...]

The default frequency is 98.000 MHz. To display the frequency pus h the SETTING k ey. In order to display the para meter 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 pa ssword is the following: • Press the PROGRAM[...]

If the password is not correc t an error is displayed: After a few seconds the display will show the parameters again. • When the password is correc t, th e display will show: To change the password pr ess the SETTING key. To change the frequ ency press the PROGRAM key. • For changing the password proceed with the same method for the required p[...]

If the password is correc t the display will show: If the confirmation password is wrong the display will show: IMPORTANT NOTE ! BE CAREFUL ! Once the password is set, it mu st be remembered, otherwise neither the frequency nor the passwo rd can be reset and the unit will have to be returned to Nicom for resetting. Display Change of Frequency. • [...]

The underscore character indic ates which digit can be change. To move the underscore char acter hit the PROGRAM key. When the new frequency is chos en, then press the SETTING key confirm it. After a “WAIT CYCLE”, the disp lay will show the parameters: After 7 minutes the display light will sw itch off and the di splay will show: MOD > FRW 5[...]

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 10 CHAPTER 2 ELECTRICAL SPECIFICATIONS NT 250 TECHNICAL DATA Power output: 2 to 270 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 H[...]

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 11 COMPOSITE OPERATION Composite inputs four total, 1 for MPX and 3 for SCA MPX input 1 unbalanced bnc connector MPX input impedance 2 K ohms MPX input level 3,5 V p-p (1,237 Vrms/3.64 dBm) Composite FM unweighed S/N ratio > 78 dB below ± 75 Khz deviation at 400 Hz measured in a 30 Hz - [...]

NT 250 Technical and Maintenance Manual NicomUsa Inc Page 12 MECHANICAL SPECIFICATIONS Chassis Dimensions: 132 mm (5.1") H 326 mm (12.83")D 445 mm (17.51) W Front panel dimensions: 483 mm (19") W 132 mm (5.1") H Ambient operating temperature: from 0 to + 50 C (+32 to +122 F) Humidity: 90% maximum, non condensing. Weight: 32 Lbs [...]

NICOM TITLE DATE DRAWING NO . NT250 FRONT P ANEL JUL Y 2001 Nt250 Front P anel.CDR 1- 2 - POWER ST AGE SUPPL Y CORRECT OPERA TION YELLOW INDICA TOR 3 - PLL LOCK FREQUENCY CONTROL CORRECT OPERA TION CIRCUIT GREEN INDICA TOR 4 - PRESENCE OF RF POWER A T FREQUENCY SET ON OUTPUT CONNECT OR GREEN INDICA TOR 5 - RF OUTPUT POWER ADJUSTING FROM 0 TO OVER 2[...]

NICOM TITLE DA TE DRAWING NO. 1 - MAIN SUPPL Y CONNECT OR 2 - AC FUSE 3A 3-F A N 4 - DB 9 PIN INPUT / OUTPUT CONNECTOR FOR TELEMETR Y ( opt.01 ) 5 - BNC FEMALE FOR CONNECTION OF THE INTERLOCK LOOP - A CONNECTION TO GROUND INHIBIT RF POWER 6-7-8- BNC FEMALES FOR SUBCARRIERS GENERA TORS INPUTS 9-10-1 1- SCA INPUT ADJUSTING LEVELS 12 - XLR FEMALE BALA[...]

VCO AUDIO INPUT RF DRIVER RF AMPLIFIER PLL LIMITER TCXO 12.8 MHz LPF DIRECTIONAL COUPLER POWER SUPPLY SIGNAL INTERFACE MICROCONTROLLER DISPLAY NICOM MPX MONO SCA ADJ RS232 VDC VAC RF OUTPUT MHz 98.000 Mod. NT 250 1.0 FUNCTIONAL SCHEMAT IC B 1 1 Friday, October 24, 2003 Titl e Si ze Document Number Rev Date: She et of N COM[...]

VAC 110V - 230V L N NICOM MPX MONO SCA 1 SCA 2 SCA 3 INT ERLOCK RS2 32 L L N N MHz 98.000 with EMC FILTER Mod. NT 250 1.0 GENERAL SCHEMATIC A3 1 8 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N COM 15V POWER SUPPLY +15V GND L N GND EARTH RF FILTER RF INPUT RF OUTPUT GND RF FORWARD RF REFLECTED POWER SUPPLY +48V GND L N GN[...]

Mod. EMC-03 1.0 EMC FILTER A 1 1 Friday, January 31, 2003 Titl e Size Document Number Rev Date: Sheet of N CO M TERM 1 L IN TERM 2 GND HEART TERM 3 N IN TERM4 FUSE A TERM 5 FUSE B TERM 6 L OUT TERM 7 N OUT C2 1uF / 350V L8 0.8mH L9 0.8mH C1 2.2nF / 350V C3 2.2nF / 350V RV2 275V SW1 RV1 275V RV3 275V[...]

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TX GND RX Mod. ESVA-1C 1.0 Mather Board ESVA-1C C 1 1 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N CO M Microcontroller VU Meter ENABLE RX RS232 TX RS23 2 PLL LOCK SW2 DATA RF ON/OFF GND CLOCK Temperature Reflected PW SW1 Forward PW +5V Protection & Meter +5V +15V GND -15V FORWARD POWER REFLECT POWER V. GATE RF FWD [...]

CMRR LIMITER STEREO 75uS 50uS MON O MODULATION Mod. ESVA-1C 1.0 Audio Output C 1 1 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N CO M VC VD VA VB +15 V +15 V -15 V VA VC VB VD -15 V +15 V -15 V R38 10 0 R19 3K9 R18 1K2 J14 DJ3 + C30 100MF / 16V R30 560 K + C37 2.2MF / 50V R179 20K R40 1K2 D6 3V3 + - U2B LM3 58 5 6 7 R32 [...]

Mod. ESVA-1C 1.0 Microcontroller B 1 1 Friday, October 24, 2003 Title Size Document Number Rev Date: Sheet of N COM PLL_DTA CH3 PLL_EN EN RW ADC_EN RX SW1 TXD RXD SW1 RW TX D CH0 RS SW1 RXD PLL_LOCK PLL_CLK SDTA SETUP RS EN CH2 PLL_EN RF_ONOFF PLL_LOCK SCLK ADC_EN SETUP SDTA CH1 PROG. TX RF_ONOFF SCLK LAMP D1 LAMP D4 D3 D1 D5 D0 D6 D2 D4 D7 D[0:7] [...]

Mod. ESVA-1C 1.0 Power Supply A3 1 1 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N COM C78 0.1MF + C76 100MF / 35V D13 MBRS34 0 + C80 100MF / 25V L14 150uH U10 LM2575/S1 5 1 2 3 4 5 V IN OUTPUT GND FB ON/OFF + C79 1000MF / 25V + C81 47MF / 16V L13 22uH C77 0.1MF D12 N.C. L15 22uH + C64 47MF / 16V U11 UA7905 2 1 3 IN GND [...]

Rext 2 5K RF A DJ. RF L FWD SW R PWR Mod. ESVA-1C 1.0 Protection & Meter C 1 1 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N CO M +15 V +5V +15 V -15 V +5V +5V -15 V +5V -15 V +5V +24 V -15 V -15 V +24 V -15 V +15 V +24 V + C91 10MF / 35V + - U12B LM3 58 5 6 7 R89 15 0 R88 150 Q4 BC327 R106 1K2 R110 12K R117 12K R90 [...]

Mod. ESVA-1C 1.0 VCO B 1 1 Friday, October 24, 2003 Title Size Document Number Rev Date: Sheet of N COM R121 47 C122 100pF + C114 10MF / 35V R129 10 C120 100pF R120 22 U15 UA7808 1 2 3 IN GND OUT + C107 2.2MF / 50V C110 0.1MF + C108 2.2MF / 50V R122 22 D25 MV20 9 R133 470K + C109 1000MF / 16V + C106 1000MF / 16V D22 MV20 9 COAX1 RG178 D24 MV20 9 D2[...]

Mod. ESVA-1C 1.0 PLL B 1 1 Friday, October 24, 2003 Title Size Document Number Rev Date: Sheet of N COM + C124 10MF / 35V R150 47K J18 TEST Fref. D30 LL4148 R138 18K R135 56K C129 1nF R153 47K R161 1K R140 4K7 R146 3K9 + C136 47MF / 16V R156 47K R158 100K + C125 22MF / 16V Q10 BC327 R157 470 R159 560 + C139 22MF / 16V R142 100 + C140 2.2MF / 50V Q1[...]

Mod. ESVA-1C 1.0 RF Driver B 1 1 Friday, October 24, 2003 Title Size Document Number Rev Date: Sheet of N COM C156 NC C155 NC D32 LL4148 L24 3T/.6D C152 220pF R167 470 C145 1nF R173 39 Q12 PD55003 R162 22K R165 10K R166 18K C143 0.1MF R169 12 R176 12 R168 390 L20 18T/0.4D C149 NC C148 33pF L21 3T/.6D C147 4.7nF C157 22pF Q13 BFR96 C150 10pF L22 3T/[...]

NICOM Rif. Value Remarks Description Code C103 2.2MF / 50V SMD Aluminium Electrolytic Capacitor C104 10MF / 35V SMD Aluminium Electrolytic Capacitor C105 0.1MF SMD Multilayer Ceramic Capacitor C106 1000MF / 16V Aluminium Electrolytic Capacitor C107 2.2MF / 50V SMD Aluminium Electrolytic Capacitor C108 2.2MF / 50V SMD Aluminium Electrolytic Capacito[...]

NICOM Rif. Value Remarks Description Code C156 NC C157 22pF SMD Multilayer Ceramic Capacitor C158 22pF SMD Multilayer Ceramic Capacitor C159 0.1MF SMD Multilayer Ceramic Capacitor C160 1nF SMD Multilayer Ceramic Capacitor L1 22uH SMD Inductor L2 22uH SMD Inductor L3 22uH SMD Inductor L4 22uH SMD Inductor L5 22uH SMD Inductor L6 22uH SMD Inductor L7[...]

NICOM Rif. Value Remarks Description Code R23 12K 1/4W SMD Thick Film Resistor R24 33 1/4W SMD Thick Film Resistor R25 220K 1/4W SMD Thick Film Resistor R26 100K 1/4W SMD Thick Film Resistor R27 1K 1/4W Multi Turn Cermet Trimmer Resistor Panel Mount R28 4K7 1/4W SMD Thick Film Resistor R29 10K 1/4W SMD Thick Film Resistor R30 560K 1/4W SMD Thick Fi[...]

NICOM Rif. Value Remarks Description Code R76 33 1/4W SMD Thick Film Resistor R77 390 1/4W SMD Thick Film Resistor R78 33 1/4W SMD Thick Film Resistor R79 33 1/4W SMD Thick Film Resistor R80 1K2 1/4W SMD Thick Film Resistor R81 47K 1/4W SMD Thick Film Resistor R82 47K 1/4W SMD Thick Film Resistor R83 100K 1/4W SMD Thick Film Resistor R84 47K 1/4W S[...]

NICOM Rif. Value Remarks Description Code R129 10 1/4W SMD Thick Film Resistor R130 470 1/4W SMD Thick Film Resistor R131 6K8 1/4W SMD Thick Film Resistor R132 47K 1/4W SMD Thick Film Resistor R133 470K 1/4W SMD Thick Film Resistor R134 180 1/4W SMD Thick Film Resistor R135 56K 1/4W SMD Thick Film Resistor R136 10K 1/4W SMD Thick Film Resistor R137[...]

NICOM Rif. Value Remarks Description Code R182 470K 1/4W SMD Thick Film Resistor R183 4K7 1/4W SMD Thick Film Resistor R184 4K7 1/4W SMD Thick Film Resistor D1 LL4148 SMD Low Power Signal Diode D2 LL4148 SMD Low Power Signal Diode D3 BAT43 Diode Schottky D4 BAT43 Diode Schottky D5 LL4148 SMD Low Power Signal Diode D6 3V3 SMD Diode Zener D7 LL4148 S[...]

NICOM Rif. Value Remarks Description Code U1 OP275 Operational Amplifier U2 LM358 Operational Amplifier U3 LF353 Operational Amplifier U4 ADC0834 A/D Converter U5 MAX810L Special Function Integrated Circuit U6 T89C51RD2 Microcontroller U7 MAX232 Special Function Integrated Circuit U8 N.C. U9 MC78M05CDT Fixed Voltage Regulator U10 LM2575/S15 Operati[...]

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Mod. MIFP01 1.0 Frontal Panel A 1 1 Thursday, October 23, 2003 Tit le Siz e Document Number Rev Date: Sheet of N COM D4 ENABLE D5 LOCK PLL D2 +24V J2 RJ45 4 5 6 7 8 3 2 1 D1 +15V R7 ADJ-FM/ADJ-TX 1 3 2 R2 0 R23 0 R18 0 R6 0 R22 0-FM R20 0-FM R5 0 R4 0 R10 0-FM R8 0[...]

NICOM Rif. Value Remarks Description Code C1 N.C. C2 N.C. C3 N.C. C4 N.C. C5 N.C. R1 N.C. R2 0 1/4W Carbon Film Resistor R3 N.C. R4 0 1/4W Carbon Film Resistor R5 0 1/4W Carbon Film Resistor R6 0 1/4W Carbon Film Resistor R7 5K 1/4W Multi Turn Cermet Trimmer Resistor Panel Mount R8 0 1/4W Carbon Film Resistor R9 N.C. R10 0 1/4W Carbon Film Resistor[...]

RF OUTPUT RF INPUT Mod. RFAMP25 0W 1.0 RF AMPLIFIER 250W B 1 4 Friday, October 24, 2003 Titl e Si ze Document Number Rev Date: She et of N COM RF MODUL E 250W RF OUTPUT GA TE RF INPUT +4 8V RF FILTER & Power Meter SCHEMA TIC3 RF OUPUT RF INPUT J1 BNC C1 1n F C2 1n F C3 1n F COAX 1 RG303 D1 LM3 35 C4 10n F C5 10 0nF L2 4.7uH TERM 1 +48V TERM 2 G[...]

Mod. 250FM01 1.0 RF MODULE 250W B 2 4 Friday, October 24, 2003 Titl e Si ze Document Number Rev Date: She et of N COM TR 3 C2 7 4.7n F C2 0 10 0pF C2 2 10 pF C2 5 33p F TR2 TR5 R1 0 10 / 1W R7 100K Q1 SD 2932 R9 10 R8 10 R12 10 R1 1 10 C1 2 10n F C1 7 10n F C3 0 10n F C2 4 2.2n F R4 10 K C2 1 4.7n F C2 6 4.7n F C2 3 47 0pF + C8 10MF / 100V R2 10 K [...]

Mod. Filter250W03 1.0 RF Filter + Power Meter A3 3 4 Friday, October 24, 2003 Titl e Size Document Number Rev Date: Sheet of N COM Power Met er RF IN RF OUT C33 22pF C32 10pF C34 10pF C35 22pF L9 4T/1.5mm L10 4T/1.5mm L7 2T/1.5mm L8 4T/1.5mm C44 6.8pF C43 6.8pF C42 27pF C31 10pF C37 39pF C36 10pF C39 27pF C38 27pF C40 27pF C41 27pF RF OUPUT RF INPU[...]

Mod. Power-Meter 03 1.0 Forward and Reflected Power Meter A 4 4 Friday, October 24, 2003 Tit le Siz e Document Number Rev Date: Sheet of N COM C45 1.8pF C46 1.8pF CT 1 L11 4.7uH R13 1K C47 22pF R14 150 / 3W R15 150 / 3W D5 BAT 43 D6 BAT 43 C49 1nF C50 1nF R17 1K2 R18 1K2 C48 10nF C51 10nF R16 15K R19 6K8 C52 22pF RF IN RF OUT Forward Pow er Reflect[...]

NICOM Rif. Value Remarks Description Code C1 1nF Ceramic Lead Through Capacitor C2 1nF Ceramic Lead Through Capacitor C3 1nF Ceramic Lead Through Capacitor C4 10nF Ceramic Disc Capacitor C5 100nF Ceramic Disc Capacitor C6 100MF 63V Aluminium Electrolytic Capacitor C7 10MF 100V Aluminium Electrolytic Capacitor C8 10MF 100V Aluminium Electrolytic Cap[...]

NICOM Rif. Value Remarks Description Code C50 1nF Ceramic Disc Capacitor NPO C51 10nF Ceramic Disc Capacitor NPO C52 22pF Ceramic Disc Capacitor NPO L1 0.5T / 1.5D Tinned Copper Wire L2 4.7uH Suppression Choke L3 RF-CHOKE Suppression Choke L4 4.7uH Suppression Choke L5 3T / 1D Tinned Copper Wire L6 0.5T / 1.5D Tinned Copper Wire L7 2T/1.5mm Tinned [...]

NICOM Rif. Value Remarks Description Code Q1 SD2932 RF MOSFET J1 BNC BNC Bulkhead Connector - 50 Ohm J2 N N Panel Connector - 50 Ohm[...]