|Electronic Navigation Industries 1040L Amplifier|
Electronic Navigation Industries
The Mode! 1040L is designed to amplify signals by 55dB in the frequency range of 10 to 500kHz. The signal from the front panel connector is fed via a length of 50Ω coaxial cable to K3, Pin 3 on the relay control module (1040L-4254; see schematics). Relay K3, Pins 3 and 9 are in the normally closed position when K3 is not energized, thus allowing the input signal to pass through the power supply/driver module (1040L-4252). The input signal at J4 is coupled by C1 to the base of low noise transistor, Q4. The amplified signal at the collector of Q4 is matched, split and phase reversed by transformer T1. Two equal-amplitude phase reversed signals are fed to the bases of Q5 and Q6. The power outputs of Q5 and Q6 are combined and matched in phase reversing transformer T2, The power at T2 is then fed via a length of 50Ω coaxial cable to transformer T7. The signal at transformer T7 is matched, split and phase reversed into two equal amplitude signals. These signals are then fed to the inputs of the two power amplifier modules. At each of the two power amplifier modules (1040L-4253), hybrid transformers T1 ,T2 and T3 split the signal into four equal-phase and amplitude signals. These signals are fed to the bases of eight final power amplifier transistors (Q14-G21). These transistors are arranged to form four parallel sets of two. The outputs at the collectors of each pair are fed through their associated fuses to combining hybrids T4, T5, and T6, Fuses (F1-F4) protect the DC power supply should a transistor failure occur. The outputs from the two power amplifier modules are fed to phase reversing transformer T6 where they are combined and matched to form a 50Ω output at J8. The meter control circuit (1040L-4257) which is connected to the output of the 1040L measures both forward and load power. A front panel switch (S3) selects either the forward or actual load power on the meter display. This is accomplished passively by a three transformer matrix (T1-T3) which uses a broadband ferrite loaded transmission line coupling mechanism. The output of this matrix is divided into two channels for final computation in an integrated circuit multiplier. The output of the multiplier drives the meter display. The 1040L is designed to withstand 70W of reflected power. Should the reflected power exceed 70W, a +1VDC potential is developed across R8 on the meter control module. This +1VDC is sent to Pin 1 on Relay K2. This energizes K2 which, in turn, energizes K3. With K3 energized, DS2 illuminates and the input signal path is broken, placing the unit into an overload condition. Reducing the input drive level and depressing the overload reset switch (S2) will make the unit operational once again. In an overheat condition, normally open thermal switch TS1 will close which also opens the input signal path and illuminates DS2. Depressing overload reset switch S2 will have no effect in the overheat mode. After approximately two minutes the unit will automatically reset itself. The amplifier power requirements are 115 or 230VAC at 1500W. Regulated DC is supplied by series pass transistors Q9-13 (1040L· 4255), driven by Q8 in a Darlington arrangement. Voltage control and feedback are provided by Q1, Q7 (1040L-4252) and their associated components. The power supply voltage is adjusted to +96VDC by R20. The regulated +96VDC output of the power supply is also fed to Q2 and Q3 which, in turn, provide the lower working voltage for the driver amplifier.
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|Electronic Navigation Industries -- 1040L -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||1.08 Mbytes (1127419 Bytes)|
|Quality||Scanned document, all readable.|
|Upload date||25 January 2016|
|Downloads||115 since 25 January 2016|
This manual is divided into six chapters and two appendices. Please refer to the following descriptions to help you locate the information you need. Chapter 1 Deals with precautionary details. Please read this section if you are unfamiliar with the 1040L or ENI's warranty procedures. Chapter 2 Tells you how to install and power up the system for the first time. Chapter 3 Describes operational details of the 1040L. Chapter 4 This chapter provides a complete technical description of all the major components in 1040L. Chapter 5 Provides maintenance and calibration procedures for 1040L. Chapter 6 This chapter provides troubleshooting solutions to common problems in operating the 1040L. Appendix A This appendix provides complete operating specifications for the 1040L. Appendix B This appendix provides a drawings of the major circuit boards, schematics, and parts list used in 1040L.
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