Model A5-32 Operation And Service Manual MODEL A5-32 32 Way Distribution Amplifier USER’S HANDBOOK Quartzlock UK Ltd Gothic, Plymouth Road, Totnes, Devon TQ9 5LH, England. Tel: Fax: Web: E-mail: +44 (0) 1803 862062 +44 (0) 1803 867962 www.quartzlock.com quartzlock@quartzlock.
Model A5-32 Operation And Service Manual Contents Safety Considerations..........................................................................................................3 Voltage, Frequency and Power Characteristics ...................................................................4 Environmental Conditions ....................................................................................................4 Replaceable Fusing Characteristics.........................................................
Model A5-32 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. Before Applying Power Verify that the product is set to match the available line voltage and the correct fuse is installed. Before Cleaning Disconnect the product from operating power before cleaning.
Model A5-32 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.
Model A5-32 Operation And Service Manual Distribution Amplifier A5-12 Operating Procedure 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. Twelve of these amplifiers are used to drive the twelve 50Ω outputs. They are called the output amplifiers in the following description.
Model A5-32 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. A feedback circuit comprising TR4/TR5 and TR9/TR10 sets the DC collector current in each transistor. The voltage across the emitter resistors is set equal to a 2.
Model A5-32 Operation And Service Manual Performance Verification Equipment Required a) Spectrum analyser and tracking generator, 1 MHz to 100 MHz. b) Sine wave signal generator or function generator, 10 MHz c) RF Power meter d) Low pass filter, Mini-circuits BLP 10.7 e) 50Ω BNC load In addition, if input and output load and source impedance’s are to be checked, a network analyser will be required.
Model A5-32 Operation And Service Manual Maximum Output Connect the 10 MHz signal source to the input of the A5-12, and the spectrum analyser to any output. Increase the input level until the third harmonic rises abruptly, showing that clipping is occurring. Alternatively an oscilloscope may be used to adjust to maximum output. Transfer the output to the RF power meter and read the maximum output level. Repeat at 10 MHz if required. Spurious Outputs and Wideband Noise.
Model A5-32 Operation And Service Manual Specification 1. No of outputs: 12 2. No of inputs: 1 3. Input Characteristics: a. Impedance: b. Level: c. Input SWR: 4. Output Characteristics: a. Impedance: b. Level: c. Output SWR: d. Maximum output: 5. Frequency Response: a. 2 MHz to 100 MHz b. 500 kHz to 100 MHz 50 Ω nominal 0 dBm to +13 dBm adjustable, sine wave <1.2: 1 at 10 MHz <1.5: 1 at 100MHz 50 Ω nominal 13 dBm nominal into 50 Ω (1 volt RMS) <1.2:1 16 dBm at 10 MHz typical 14 dBm at 100 MHz typical ±1.
Model A5-32 Operation And Service Manual Appendix A5-32 Manual 29 April 2002 Page 10 of 10
