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FRONT AND REAR PANEL CONTROLS 

 

A. FRONT PANEL 

 

1.  Fuse 6.3 amps 220 Vac or 15 amps 120Vac 

 

2.  On/Off A.C. power switch 

 

3.  A.C. Blown Fuse Indicator 

 

4.  A.C. Power Indicator 

 5. 

Multimeter 

 6. 

Multimeter 

Switch 

 

7.  D.C. Fuse 20 amps 

 

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 Type "N" 

 

3.  Accessory AC plug for exciter (max 3 amps) 

 

4.  Remote protection connector Type "BNC", ground to activate 

 

5.  Remote protection connector Type "BNC". ground to activate 

 6. 

Telemetry 

Connections 

 7. 

Air 

Duct 

 

8.  A.C. Line Input 

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...

Страница 9: ...9...

Страница 10: ...10...

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...

Страница 19: ...19...

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...

Страница 28: ...28...

Страница 29: ...29...

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...

Страница 34: ...34...

Страница 35: ...35...

Страница 36: ...36...

Страница 37: ...37...

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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