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RF A 300, Instruction Manual, Page: 9 / 13

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RF A 300 Instruction Manual Download Page 9

 

The material contained in this document is the property of Electronics & Innovation Ltd., it is 
subject to change without notice.  
 
Ocotber 2008 

9 

Revision D 

 

 

 

 
 

 

Chapter 4 Maintenance 

 
4.1 INTRODUCTION 
 
The E&I A300 RF amplifier requires no periodic maintenance. The instrument is 
unconditionally stable and is fail-safe under all load conditions. Damage can only 
be externally caused by the incorrect selection of the AC supply voltage or by an 
input  signal  in  excess  of  the  specified  1  volt  rms  equivalent  to  a  power  level  of 
13dBm. 
 
This  chapter  therefore,  deals  only  with  certain  fundamental  procedures  for  fault 
location. 
 

AC IN 

SMPS 48 Volt 

SMPS 48 Volt 

SMPS 48 Volt 

SMPS 48 /24 Volt 

To page 1 a 

24 Volt 

To page 1 b 

Controller 

To page 1 c 

TTL Control 

Front Panel LCD 

To Rear 
Panel RS232 

Fans 

CKT 
BRK 

Line 

Filter 

Summary of Contents for A 300

Page 1: ...hout notice Ocotber 2008 Revision D 1 A 300 Broadband Power Amplifier HIGH RF VOLTAGES MAY BE PRESENT AT THE OUTPUT OF THIS UNIT All operating personnel should use extreme caution in handling these voltages and be thoroughly familiar with this manual Do not attempt to operate this unit prior to reading this manual ...

Page 2: ...l specifications free of charge to the original purchaser Should warranty service be required the unit must be returned to E I freight cost to be borne by the owner If in our opinion the unit has been damaged by use outside the limits prescribed in this manual or by accident then the warranty shall not be honored In such a case E I will provide an estimate for repair assuming repair is possible an...

Page 3: ...SSB pulse and any complex modulation signals The amplifier has 56 dB gain it is unconditionally stable and will not oscillate even with combinations of mismatched source and load impedance It is protected against failure due to output load mismatch and or overdrive RMS forward and reverse powers are monitored by a front panel meter An integral power supply permits operation from 100 240 VAC 47 63 ...

Page 4: ...put signal 1 0 Volts RMS for all output load conditions without damage POWER OUTPUT METER True RMS power detection 3 of full scale accuracy POWER REQUIREMENTS 100 240 VAC 47 63 Hz SIZE 13 X 16 75 X 20 inches 330 X 425 x 508 mm WEIGHT 95 pounds 43 kg CONNECTORS N OPERATING TEMPERATURE 0 40 C RACK MOUNTING Chapter 2 Operation 2 1 INTRODUCTION The A300 RF amplifier is used to amplify the RF level of ...

Page 5: ...s 5 times the level of the input signal required to achieve maximum output Input voltages in excess of 2 volts peak may permanently damage the instrument iii Connect the output via a 50 ohm coaxial lead and N plug to the load iv Connect the input signal via a 50 ohm coaxial lead and N plug to the input connector 2 3 2 Front Panel Display The A300 front panel has a passive LCD display designed for ...

Page 6: ...ce suitable for connection to a PC or host system The communication protocol is extremely simple to facilitate readback and control with readily available terminal programs such as Hyperterm The RS 232 link has the following parameters Baud rate 19200 Data bits 8 Parity none Stop bits 1 Flow control none An example configuration using HyperTerminal on a PC is shown in figure 2 2 In the default sta...

Page 7: ...ransformed to 50 Ω and fed to the driver output BNC port The driver output signal is fed through a length of coaxial cable to the input of the power splitter the four outputs of this are each fed to the four amplifier modules In each PA module the signal is split into two equal phase and amplitude signals These signals are fed to the inputs of transistors Q1 and Q2 The amplified signals appearing ...

Page 8: ...r 2008 8 Revision D total of 24 amps The main power supply also has a 5 VDC output which feeds the control board Combiner Splitter Gating Board Option 403 LA A075 PA Coupler TTL Input 24 Volt To Page 2 a RF IN RF OUT To Page 2 b To Page 2 c To Page 2 b 48 Volt 48 Volt RF Detect A075 PA A075 PA A075 PA A300 RF Amplifier A300 SCH 01 ...

Page 9: ...fail safe under all load conditions Damage can only be externally caused by the incorrect selection of the AC supply voltage or by an input signal in excess of the specified 1 volt rms equivalent to a power level of 13dBm This chapter therefore deals only with certain fundamental procedures for fault location AC IN SMPS 48 Volt SMPS 48 Volt SMPS 48 Volt SMPS 48 24 Volt To page 1 a 24 Volt To page ...

Page 10: ...tor c Adjust the output level of the sweep generator so that a 50 ohm video detector connected at the output of the unit will not be damaged by excessive power output Reference section 4 4 1 for set up d Observe the gain versus frequency ripple on an oscilloscope calibrated in decibels The gain variation must be not more than 1 5 dB over the frequency range e Connect a calorimetric power meter HP4...

Page 11: ...k D151 e Attenuator 30 dB 500 Watts Bird Figure 4 1 Gain Measurement 2 Connect the equipment as shown in Figure 4 1 then proceed as follows a Set the oscilloscope to DC Time cm to Ext X and gain to l0mv cm b Set the sweep generator to the video sweep mode with the start frequency at 300 kHz and the sweep width to 35 MHz c Disconnect the A300 from the set up and connect the sweep generator RF outpu...

Page 12: ...vel to full deflection Rotate the step attenuator CCW so that the output is reduced by 50 dB g Reconnect the A300 into the test set up of Figure 4 1 h Place the A300 power switch to the ON position i Observe the gain versus frequency sweep on the oscilloscope The average gain should be greater 55 dB The gain variation should be within the 3 dB as shown on the oscilloscope 4 4 2 Measurement of Harm...

Page 13: ...wrap the instrument in heavy paper or plastic and place in a rigid outer box of wood fiberboard or very strong corrugated cardboard Use ample soft packing to prevent movement Provide additional support for projecting parts to relieve these of unnecessary shock Close the carton securely and seal with durable tape Mark the shipping container FRAGILE to ensure careful handling Chapter 5 Safety Do not...

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