Quartzlock A5-12 Operation & Service Manual Download Page 11

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Model

-12 Operation & Service Manual

A5-12 Manual A5 21 January 2005

Page 11

1.  Remove the lid.
2.  Connect desired input between 0 and 13 dBm.
3.  Connect a spectrum analyser, oscilloscope with 50

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.

5. Replace the lid.

4.2.9

Note:

All the amplifiers are class A linear amplifiers. The gain may be set to provide any
output level up to clipping if desired.

Summary of Contents for A5-12

Page 1: ...Model A5 12 Operation Service Manual A5 12 Manual A5 21 January 2005 Page 1 A5 12 12 Way Distribution Amplifier OPERATION SERVICE MANUAL...

Page 2: ...eplaceable Fusing Characteristics 5 1 5 Cleaning Instructions 5 2 Operating Procedure 6 2 1 Introduction 6 2 2 Input 6 2 3 Outputs 6 3 Circuit Descriptions 7 3 1 Output Amplifier 7 3 2 Mother Board 7...

Page 3: ...re to heed a warning Do not proceed beyond a warning until the indicated conditions are fully understood and met CAUTION Damage to equipment or incorrect measurement data may result from failure to he...

Page 4: ...erative and be secured against any unintended operation If the instrument is to be energised via an autotransformer for voltage reduction make sure the common terminal is connected to the earthed pole...

Page 5: ...uctions To ensure long and trouble operation keep the unit free from dust and use care with liquids around the unit Be careful not to spill liquids onto the unit If the unit does get wet turn the powe...

Page 6: ...plifiers in the following description A modified version of the output amplifier with a gain control called the input amplifier drives a twelve way passive power splitter This divides the signal with...

Page 7: ...d R3 set 100 output impedance for each transistor When combined in T1 a 50 output impedance results Due to the output impedance the gain of the output stages is 6 dB when the amplifier is loaded with...

Page 8: ...n The 50 output impedance of the input amplifier provides a good match to the passive splitter PS1 The main board is supplied from a 24V DC supply An off board regulator provides 18V R41 and R42 set t...

Page 9: ...l to 10 dBm and the spectrum analyser to sweep between 1 MHz and 100 MHz Adjust the A5 12 gain control VR1 to give an output level of 13 dBm at 10 MHz Measure the frequency response and verify against...

Page 10: ...mbinations of outputs choosing adjacent and remote outputs and verify against the specifications 4 2 5 Maximum Output Connect the 10 MHz signal source to the input of the A5 12 and the spectrum analys...

Page 11: ...dBm 3 Connect a spectrum analyser oscilloscope with 50 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 5 Replace the lid...

Page 12: ...m nominal into 50 1V RMS Output SWR 1 2 1 Maximum output 16dBm at 10 MHz typical 14dBm at 100 MHz typical Frequency Response 2 MHz to 100 MHz 1 5dB 500 kHz to 100 MHz 3dB Harmonics 10 MHz Source harmo...

Page 13: ...c 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...

Page 14: ...Model A5 12 Operation Service Manual A5 12 Manual A5 21 January 2005 Page 14...

Page 15: ...Model A5 12 Operation Service Manual A5 12 Manual A5 21 January 2005 Page 15...

Page 16: ...Model A5 12 Operation Service Manual A5 12 Manual A5 21 January 2005 Page 16...