Related Manuals for Quartzlock A5-12
Summary of Contents for Quartzlock A5-12
- Page 1 Model A5-12 Operation & Service Manual A5-12 12 Way Distribution Amplifier OPERATION & SERVICE MANUAL A5-12 Manual A5 21 January 2005 Page 1...
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Page 2: Table Of Contents
Model A5-12 Operation & Service Manual Contents Safety Considerations............3 General ..............3 1.1.1 Before Applying Power ........3 1.1.2 Before Cleaning..........3 1.1.3 This equipment must be earthed ......3 Voltage, Frequency and Power Characteristics ..4 Environmental Conditions ..........4 1.3.1 Temperature ............4 1.3.2 Magnetic Field ............5 Replaceable Fusing Characteristics ......5... -
Page 3: Safety Considerations
Model A5-12 Operation & Service Manual 1 Safety Considerations 1.1 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 A5-12 Operation & Service Manual WARNING Instructions for adjustments when covers are removed and for servicing are for use by service-trained personnel only. To avoid dangerous electrical shock, do not perform such adjustments or servicing unless qualified to do so. -
Page 5: Magnetic Field
Model A5-12 Operation & Service Manual 1.3.2 Magnetic Field Sensitivity ≤2x10 / Gauss Atmospheric Pressure -60m to 4000m <1x10 / mbar 1.4 Replaceable Fusing Characteristics 800mA time-lag HBC 1.5 Cleaning Instructions To ensure long and trouble operation, keep the unit free from dust and use care with liquids around the unit. -
Page 6: Operating Procedure
2 Operating Procedure 2.1 Introduction The Quartzlock model A5-12 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. -
Page 7: Circuit Descriptions
Model A5-12 Operation & Service Manual 3 Circuit Descriptions 3.1 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 8 Model A5-12 Operation & Service Manual The input amplifier is very similar to an output amplifier module, except variable gain is provided. The gain control is VR1, which varies the transconductance of TR6 and TR7. C12 provides high frequency compensation. The 50Ω output impedance of the input amplifier provides a good match to the passive splitter, PS1.
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Page 9: Performance Verification
4.2.2 Harmonic Distortion Connect the 10 MHz signal source to the Model A5-12 input using the low pass filter to remove source harmonics to less than -60 dBc. Set the output level to +10 dBm. Connect the spectrum analyser to any output and adjust the A5-12 gain control to give +13 dBm output. -
Page 10: Output To Input Isolation
4.2.6 Spurious Outputs and Wideband Noise. With the gain of the A5-12 adjusted for 13 dBm output with 10 dBm input at 10 MHz, disconnect the signal source and terminate the input with the 50Ω load. Connect the spectrum analyser to any input and search for discrete spurii. -
Page 11: Note
Model A5-12 Operation & Service Manual 1. Remove the lid. 2. Connect desired input between 0 and 13 dBm. 3. Connect a spectrum analyser, oscilloscope with 50Ω input impedance, or RF power meter to any output. 4. Adjust output level to 13dBm (1V RMS) using the pre-set (VR1) on the main board. -
Page 12: Specification
Model A5-12 Operation & Service Manual 5 Specification Input Characteristics No of inputs Impedance 50Ω nominal Level 0dBm to +13dBm adjustable, sine wave Input SWR <1.2: 1 at 10 MHz <1.5: 1 at 100MHz Output Characteristics No of outputs Impedance 50Ω... - Page 13 Model A5-12 Operation & Service Manual < -110 dBc (above 1 MHz) Broadband Noise < -150 dBm/Hz Delay Match Between Outputs < 1ns Temperature Stability of Delay 10ps/°C Phase change at output due to open or short at any other output (Calculated from isolation): <0.5ps (at 10MHz)
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