Dieter wrote:
So the question is whether you can make a good PC card digital
oscilloscope for $100.00. You need an oscillator, frequency divider,
PLL, sample & hold, and DAC as well as the PCIe interface. I seriously
doubt that this is possible for $100.00 but it does depend on the
maximum input frequency you wish to use, sample rate, and the accuracy
(and number of bits) needed. Actually, you can spend over $100. on a
good DAC
You can get a 2.4 GHz spectrum analyzer for $129.
http://www.dunehaven.com/lcsa.html
If a 2.4 GHz spectrum analyzer can be sold for $129, why not a lower
frequency unit?
This device isn't really a digital spectrum analyzer. It is a sweeping
RF signal strength meter. Such a device is quite useful but it isn't
going to work for lower frequencies.
Okay, I'll bite. What's the difference between a spectrum analyzer
and a sweeping meter? Don't most (perhaps all) analog spectrum analyzers
work by sweeping a filter through the desired frequency range?
There isn't a great deal of difference between how this thing works and
an *analog* spectrum analyzer. This thing doesn't sweep, it collects
data on individual frequencies.
However, there is a great deal of difference between this thing and a
*digital* spectrum analyzer which computes the Fourier series for a wave
form in software. There is no filter response shape to worry about.
--
JRT
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