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PJ 250

FM Power Amplifier

87.5 - 108 MHz Range

TECHNICAL

MANUAL

Содержание PJ 250

Страница 1: ...1 PJ 250 FM Power Amplifier 87 5 108 MHz Range TECHNICAL MANUAL...

Страница 2: ...D POWER 20 FIGURE 7 SCHEMATIC DRIVER AMPLIFIER PJ250 L D ONLY 22 FIGURE 7a IPA RF AMPLIFIER PJ250 L D ONLY 23 FIGURE 8 SCHEMATIC POWER AMPLIFIER 25 FIGURE 9 SCHEMATIC ALARMS CARD 27 FIGURE 10 COMPONEN...

Страница 3: ...h voltage points before servicing 6 Any damage to the goods must be reported to the carrier in writing on the shipment receipt Any discrepancy damage discovered subsequent to delivery shall be reporte...

Страница 4: ...tation process We recommend the use of UPS or similar freight services and would discourage the use of the postal system The customer assumes the risk of loss i e BEXT Inc is not responsible for damag...

Страница 5: ...on of both the amplifier and the exciter Set the exciter to the desired frequency of operation C Connect the RF output of the exciter to the input of the amplifier The input of the amplifier uses a ty...

Страница 6: ...in standby via a momentary contact closure A momentary contact closure will also reactivate the amplifier A second input is provided which will place the amplifier and exciter in standby Two BNC conne...

Страница 7: ...Output Impedance 50 ohm I O Connector Standard N Connector Harmonic and Spurious Signal Suppression meets or exceeds FCC and CCIR regulations Power Consumption 800 w TABLE B DIMENSIONAL AND ENVIRONME...

Страница 8: ...D C Blown Fuse Indicator 9 Temperature Alarm Indicator Lamp 10 Excessive Drive Alarm 11 VSWR Alarm Indicator 12 Remote Disable Indicator B REAR PANEL 1 RF output connector Type N 2 RF input connector...

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Страница 11: ...g l excessive input drive power 4 Fig l and excessive SWR 5 Fig l A green indicator confirms the amplifier is operational 10 Fig 1 PROTECTION CIRCUITS The protection circuits put the amplifier in stan...

Страница 12: ...n the right position as shown in Fig 3 Thanks to this low pass filter the harmonic suppression is greater than 75 dBm DIRECTIONAL COUPLER This circuit is placed on the upper right side of the amplifie...

Страница 13: ...s section contains useful information for card replacement WARNING TO RE INSTALL CARDS SIMPLY FOLLOW THE REVERSE PROCEDURE POWER SUPPLY REPLACEMENT 1 open the top and bottom covers 2 Remove the four s...

Страница 14: ...position 2 Connect 1 Fig 2 a non inductive dummy load 50 ohm 250W to RF output with a through wattmeter e g BIRD mod 43 in series as shown in SETUP 1 3 Set the exciter power to obtain 250W on the thr...

Страница 15: ...5 Fig 1 CALIBRATION OF OVER DRIVE ALARM THRESHOLD 1 Adjust the driver power to minimum and switch on the amplifier 2 Place the DIR REF selector 12 Fig l to the REF position 3 Connect 1 Fig 2 a non in...

Страница 16: ...16 SETUP 1...

Страница 17: ...17 SETUP 2...

Страница 18: ...18...

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Страница 20: ...20 FIGURE 5 SCHEMATIC UNREGULATED POWER...

Страница 21: ...21 FIGURE 6 SCHEMATIC REGULATED POWER...

Страница 22: ...2 ohm 5 watt TRF Transformer Power 31 Vac 20 R6 Resistor 5 6 ohm 1 2 watt amp 18Vac 1 amp tapped R7 Resistor WW 0 22 ohm 5 watt primary R8 Resistor 5 6 ohm 1 2 watt R9 Resistor WW 0 22 ohm 5 watt REGU...

Страница 23: ...23...

Страница 24: ...24 F I G U R E 7a...

Страница 25: ...ca Unelco 1nF C5 Capacitor Ceramic 100nF C6 Capacitor Ceramic group of 8 82pF each C7 Capacitor Ceramic 47nF C8 Capacitor Elec 100 F 35Vdc C9 Capacitor Ceramic 1nF C10 Capacitor Ceramic Group of 4 56p...

Страница 26: ...26...

Страница 27: ...ohm 1 2 watt C5 Not Used R5 Resistor 12 ohm 1 2 watt C6 Capacitor Mica 1nF SEMCO C7 Capacitor Ceramic chip 470pF T1 RF Power Transistor MRF317 C8 Capacitor Ceramic chip 12pF T1 RF Power Transistor MRF...

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Страница 30: ...2K ohm Pot C21 Capacitor Elec 4 7 F 35Vdc R8 Resistor 330 ohm 1 4 watt R9 Resistor 47 ohm 1 4 watt D1 Diode 1 N914 R10 Resistor 100K ohm 1 4 watt D2 Diode 1 N914 R11 Resistor 100K ohm 1 4 watt D3 Diod...

Страница 31: ...t R42 Resistor 10K ohm 1 4 watt R43 Resistor 47K ohm 1 4 watt R44 Resistor 10K ohm 1 4 watt R45 Resistor 10K ohm 1 4 watt R46 Resistor 47K ohm 1 4 watt R47 Resistor 10K ohm 1 4 watt R48 Resistor 47K o...

Страница 32: ...32...

Страница 33: ...Doing so will result in detuning the low pass filter with resulting damage to the RF amplifier due to mismatch PARTS LIST DIRECTIONAL COUPLER C1 Capacitor Ceramic 1 8pF C2 Capacitor Variable 30pF C3...

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Страница 38: ...N4148 R23 Resistor 2 2 Meg ohm 1 4 watt D2 Diode 1 N4148 R24 Resistor 2 2 Meg ohm 1 4 watt D3 Diode 1 N4148 R25 Resistor 2 2 Meg ohm 1 4 watt D4 Diode 1 N4148 R26 Resistor 1 Meg ohm 1 4 watt D5 Diode...

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