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Quartzlock UK Ltd
Gothic,
Plymouth Road,
Totnes,
Devon
TQ9 5LH,
England.
Tel:
+44 (0) 1803 862062
Fax:
+44 (0) 1803 867962
Web:
www.quartzlock.com
E-mail: quartzlock@quartzlock.com
A5-24 Manual 20 March 2002
Model A5-24 Operation And Service Manual
MODEL A5-24
24 Way Distribution Amplifier
USER'S HANDBOOK
Page 1 of 10
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Summary of Contents for Quartzlock A5-24
- Page 1 Model A5-24 Operation And Service Manual MODEL A5-24 24 Way Distribution Amplifier USER’S HANDBOOK Quartzlock UK Ltd Gothic, Plymouth Road, Totnes, Devon TQ9 5LH, England. Tel: +44 (0) 1803 862062 Fax: +44 (0) 1803 867962 Web: www.quartzlock.com E-mail: quartzlock@quartzlock.com A5-24 Manual 20 March 2002...
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Page 2: Table Of Contents
Model A5-24 Operation And Service Manual Contents Safety Considerations......................3 Voltage, Frequency and Power Characteristics ..............4 Environmental Conditions ....................4 Replaceable Fusing Characteristics..................4 Cleaning Instructions ......................4 Distribution Amplifier A5-24 ....................5 Operating Procedure ......................5 Output Amplifier ......................6 Mother Board........................6 Performance Verification ....................6 Equipment Required .....................6 Procedures ........................7... -
Page 3: Safety Considerations
Model A5-24 Operation And Service Manual Safety Considerations General This product and related documentation must be reviewed for familiarisation before operation. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the instrument may be impaired. -
Page 4: Voltage, Frequency And Power Characteristics
Model A5-24 Operation And Service Manual For continued protections against fire, replace the line fuse(s) with fuses of the same current rating and type (for example, normal blow time delay). Do not use repaired fuses of short-circuited fuse holders. Voltage, Frequency and Power Characteristics... -
Page 5: Distribution Amplifier A5-24
Operating Procedure Introduction The Quartzlock model A5-24 is a linear distribution amplifier designed for standard frequency distribution between 1 MHz and 100 MHz. The circuit is based on a number of balanced linear amplifiers with high reverse isolation and low phase noise. Twelve of these amplifiers are used to drive the twelve 50Ω... -
Page 6: Output Amplifier
Model A5-24 Operation And Service Manual Circuit Descriptions Output Amplifier The output amplifier is a differential amplifier based on a common emitter, common base, and common collector cascade circuit. TR7 and TR8 are the common emitter input stages. The emitter resistors R11 and R23, and R12 set the transconductance. -
Page 7: Procedures
Connect the tracking source to the input of the Model A5-24, and the spectrum analyser to any output. Set the tracking generator output level to 10 dBm, and the spectrum analyser to sweep between 1 MHz and 100 MHz. Adjust the A5-24 gain control (VR1) to give an output level of 13 dBm at 10 MHz. - Page 8 Model A5-24 Operation And Service Manual analysers’ noise figure, correct for measurement bandwidth, log amplifier, and detector. Alternatively use a noise figure meter. Input and Output SWR Measure using a reflection bridge or network analyser Setting Up The only user adjustment required is to set the output levels. To do this proceed as follows: 1) Remove the lid.
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Page 9: Specification
Model A5-24 Operation And Service Manual Specification 1. No of outputs: 2. No of inputs: 1 or 2 3. Input Characteristics: 50 Ω nominal a. Impedance: b. Level: 0 dBm to +13 dBm adjustable, sine wave c. Input SWR: <1.2: 1 at 10 MHz <1.5: 1 at 100MHz 4. -
Page 10: Appendix
Model A5-24 Operation And Service Manual Appendix A5-24 Manual 20 March 2002 Page 10 of 10...
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