Quartzlock A5-12 Operation & Service Manual - 2 Operating
Model
A5
-12 Operation & Service Manual
A5-12 Manual A5 21 January 2005
Page 6
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. Twelve of these amplifiers are used to drive the twelve 50
Ω outputs.
They are called the output amplifiers 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 an
insertion loss of about 12 dB, and provides isolation of about 20 dB. The output
amplifiers each have an output signal monitor circuit, which is used as part of the
output fail monitoring.
2.2 Input
One input is provided. This has input impedance of 50
Ω. The input level should be
between 0 and +13 dBm.
2.3 Outputs
Up to twelve outputs are provided. These have source impedance of 50
Ω, and will
provide 13 dBm nominal into a 50
Ω load. Maximum output is up to 16 dBm.