Equipment information

Electronic Navigation Industries 1040L Amplifier
Electronic Navigation Industries
Model 1040L
Date 1996
Category: Radio, Communication
Group Amplifier
Description Power Amplifier
                                    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.

These manuals are available for the above equipment:

Manual Type Service and User Manual ENI-7562-Manual-Page-1-Picture
Pages 42
Size 1.08 Mbytes (1127419 Bytes)
Language english
Revision C2
Manual-ID/Number 1040L-100
Date 1996
Quality Scanned document, all readable.
Upload date
MD5 596534cb6fefac40784b83cc64908e38
Downloads 125 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
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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