View Full Version : 2.4 GHz Spec An Obj

12-13-2009, 04:45 AM
I have been looking around for a reasonably priced spectrum analyzer, but first wanted to learn more about them to be a more informed consumer. This object (2nd pg of·Signal... in the OBEX)·is interesting, but seems to be unuseable for isolating a single frequency - especially with Wi-Fi around.

Is there anyone who has played around with it and sped up or cleaned up any of it's functionality or who has ideas of how to do so? Perhaps some extra circuitry is needed to filter before it gets processed?

Its a really cool object, but it needs some sprucing up.

BH http://forums.parallax.com/images/smilies/skull.gif

12-13-2009, 06:50 AM
I don't know this object but right from the hip
I ask isn't 2.4 GIGA-Hz way above what the counters of the prop can count properly ???

best regards


12-13-2009, 08:54 AM
I'm sure it is. 128 MHz is max if runnin @ 80MHz, no?

The Cypress module probably does most of the work, but I do not know.

BH http://forums.parallax.com/images/smilies/skull.gif

12-13-2009, 01:33 PM
If I remember the prewords right then
MHz is 1.000.000 10^6
GHz is 10^9

so 128MHz is 0.128 GHz and on your screen you wrote 2.4GHz = 2400 MHz

Wich Cypressmodule ?

best regards


12-13-2009, 03:44 PM
I recommend talking to a ham radio operator who is a member of a club and probably knows a microwave technician
or engineer in the radio club, whose day job is working with digital microwave radio signals, and may have a microwave
spectrum analyzer to show you and answer your questions about it. (Digital radio can get weird enough to be
unrecognizable on common test equipment, considering that it is already mixed with all the analog channels
and you probably can't even hear the difference, and that 64 cell phone calls can simultaneously go over the
same frequency and sound the same as white noise always, whether there are 0, 1, or 64 calls in progress.)

Programming the Propeller to do the job IS POSSIBLE but is involves a black (magic) box of math called Fast Fourier
Transform that you can even look inside and still not know what is going on, and even the engineers bow to the math wizards
who do understand it and write the code for it. But before that you have to "hack" a UHF TV tuner or a used Wifi router
to tune in those frequencies in the microwave band spectrum and move them way down within reach of sampling,
either on an Intermediate Frequency (IF) or "Baseband" (Frequency Zero), where they are easily measured.

P.S. Don't be a "Consumer". Consumers buy crap, eat it, and then flush it. http://forums.parallax.com/images/smilies/burger.gif http://forums.parallax.com/images/smilies/nono.gif
(But a Microwave Spectrum Analyzer is highly respected Professional Equipment, and
If you have one and you know how to use it, there are lots of high paying jobs looking for you.)