自制频谱分析仪2.pdf

文档介绍：By Wes Hayward, W7ZOI, and Terry White, K7TAU
A Spectrum Analyzer for
the Radio Amateur—Part 2
Part 1,14 we described the
design and construction of a
simple, yet useful spectrum Here are
In analyzer. This installment pre-
sents some applications and methods that some
extend the underlying concepts. examples of
Amplifier Gain Evaluation
One use for a spectrum analyzer is ampli- procedures
fier evaluation. We can illustrate this with a you can use
small amplifier from the test-equipment
drawer—an old module that has been pressed to become
into service for a variety of experiments. This
circuit, shown in Figure 11, is used for illus- familiar with
tration only and is not presented as an opti-
mum design. It’s a project that grew from your new
available parts and may be familiar to some
readers. The circuit uses four identical