M
Mjolinor
Guest
I need a battery operated device for measuring signal and /or noise, sort of
like a very basic spectrum analyser and would like some thoughts from you
educated people (you can decide who the educated people are).
As follows
1 to 40 MHz, resolution bandwidth is not desperately narrow, could probably
get away with 2.5 MHz but 1 MHz would be good. I can't connect directly to
the wire so I would use a split toroid to grab the signal/noise.
From the other end a wifi card in an IPAQ, data in through the serial port
on the bottom. This bit is fairly easy.
-60dBm would do but -80 dBm would be better. I realise that this is what
costs the money and would like it to be cheap. Absolute measurements are
probably not needed as I could "calibrate" it before each use with a signal
generator.
What suggestions for the bit in between the toroid secondary and the
(probably PIC based) serial output stream to the IPAQ. First thoughts are to
use correlation to select the input window and do the whole thing with some
basic DSP algorithms and it has been years since I went there so maybe that
is way off.
This is something I am just thinking about, I don't know if it is feasable
at a reasonable cost and am certainly nowhere near the "building it" point.
I would just like some input and possible methods. Maybe there is something
out there that does this more or less off the shelf but it would need to be
small. Laptop, National Instruments cards are probably not an option, too
heavy.
like a very basic spectrum analyser and would like some thoughts from you
educated people (you can decide who the educated people are).
As follows
1 to 40 MHz, resolution bandwidth is not desperately narrow, could probably
get away with 2.5 MHz but 1 MHz would be good. I can't connect directly to
the wire so I would use a split toroid to grab the signal/noise.
From the other end a wifi card in an IPAQ, data in through the serial port
on the bottom. This bit is fairly easy.
-60dBm would do but -80 dBm would be better. I realise that this is what
costs the money and would like it to be cheap. Absolute measurements are
probably not needed as I could "calibrate" it before each use with a signal
generator.
What suggestions for the bit in between the toroid secondary and the
(probably PIC based) serial output stream to the IPAQ. First thoughts are to
use correlation to select the input window and do the whole thing with some
basic DSP algorithms and it has been years since I went there so maybe that
is way off.
This is something I am just thinking about, I don't know if it is feasable
at a reasonable cost and am certainly nowhere near the "building it" point.
I would just like some input and possible methods. Maybe there is something
out there that does this more or less off the shelf but it would need to be
small. Laptop, National Instruments cards are probably not an option, too
heavy.