Combine CHAPTER 3 INSTALLATION 3.1 INTRODUCTION This chapter contains the information required for installation of the NT 20 exciter and for preliminary checks. 3.2 UNPACKING Remove the unit from ifs packaging and before any other operation, check for any damage that the unit may have suffered in transit and that all front and rear pans! controls are functioning. 3.3 INSTALLATION 1 2) You don't need to select the AC power input because the power supply accepts all voltages between 90 and 240 Volts.
Nicobar 3.4 PER-INSTALLATION Before the installation of the equipment, we suggest to execute a complete check on #, to avoid problems during the installation itself. Power Output Checking 1 Now ensure that the PWR ADJ control is turned fully counter clockwise, using a small screwdriver. Units are usually shipped with this control already at 10 W. WARNING: When the unit is switched on with the control at its minimum position, power output is about TW.
Dominic a power level of about TW. To check this reading, select FORWARD POWER, and then read the power on the 25W full scale meter. 8) Using a small screwdriver, rotate the PWR ADJ control clockwise; the power . output should increase progressively to a maximum of 20-25W. Check the value with the bypass watt meter which should be within 210%. Deviation reading check 1) Put the selector in the DEV position. Connect a low-distortion audio generator to the MONO and/or MPX inputs.
Dominic CHAPTER 4 MAINTENANCE 4.1 SAFETY REQUIREMENTS WARNING WARNING WARNING WARNING WARNING WARNING WARNING Removing the top cover when the exciter is operational, will expose the operator to lethal voltages on the main AC line and heavy currents on the power supply filter terminals and power transistors. Use insulated tools for any type of maintenance work and do not touch any internal components when the exciter is switched on.
1 MAIN SWITCH 2 POWER SUPPLY INDICATOR 3 ON AIR INDICATOR (OPERATIVE STATUS ) 4 PLL LOCK INDICATOR 5 OVEREMPHASIS CIRCUIT SWITCH 6 MULTI METER SELECT FUNCTION 7 MULTI METER & POWER ADJUSTING TRIMMER 9 INTERLOCK BNC CONNECTOR NI COM NT FM EXCITER-TRANSMITTER -FRONT PANEL GATE JAWING NO, NOV, 2003 CHINTZ B FRONT LAYOUT.
LINE SOCKET MPX COMPOSITE INPUT CONNECTOR MODULATION LEVEL ADJUSTING RF OUTPUT CONNECTOR SCA INPUT FAN NI COM TIE" NT FM EXCITER-TRANSMITTER -REAR
I= T FREQUENCY SETTING Example for 88.1 Mhz Example for 101.