A/d 0831
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Posts: 46,084
Is there a simple way of using the 0831 to measure the output of a
radio receiver and graphing it to stamplot2?
I have the Industrial controls book and the BOE kit?
I made the temp circuit and it worked.
Instead of two traces I only need one and it needs to graph a minimum
of six hours.
Can this be donesimply or what do I have to do? I really need this
for my radio astronomy receiver recording.
Thanks if you can help
Jim
radio receiver and graphing it to stamplot2?
I have the Industrial controls book and the BOE kit?
I made the temp circuit and it worked.
Instead of two traces I only need one and it needs to graph a minimum
of six hours.
Can this be donesimply or what do I have to do? I really need this
for my radio astronomy receiver recording.
Thanks if you can help
Jim
Comments
How fast are the blips you want to capture? I know very little about radio
telescopes, but all DSP projects require first estimating the bandwidth of
the recorded signal, and then sampling at a minimum of twice the highest
frequency of interest (Nyquist theorem). With real-world noisy signals, it
is better to sample at 5-10 times the highest frequency of interest. Other
issues include first low-pass analog filtering the received signal to avoid
distortion due to "aliasing" -- the effect that causes wagon wheels to
appear to be turning backwards in old western films. Also, data streaming
for continuous plotting over 6 hours might require "double buffering" to
avoid missed data. That means sending data to one data array while
simultaneously writing out data from a second array, and then switching the
arrays.
All these tricks of the DSP world have been done for decades with some
pretty slow computers (in my case, event recording from low-energy nuclear
particle detectors), so my best guess is that you can do them better and
easier with the newer generation of Stamps.
Dennis
(A former physics grad student who switched to biophysics.)
Original Message
From: James Hardy [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=QOsdRNUPy6R_jvWVJg4NRKxB0kBAt0KcMb-mOqyabUu0BQyw5dNBtqMApPnembqs_Ka5OHHQWrYjA7FtmoI]jahardy33@h...[/url
Sent: Thursday, December 14, 2000 10:01 AM
To: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] A/D 0831
Is there a simple way of using the 0831 to measure the output of a
radio receiver and graphing it to stamplot2?
I have the Industrial controls book and the BOE kit?
I made the temp circuit and it worked.
Instead of two traces I only need one and it needs to graph a minimum
of six hours.
Can this be donesimply or what do I have to do? I really need this
for my radio astronomy receiver recording.
Thanks if you can help
Jim
downconverted to 1450mhz.THen using a modified Sat detector to an A/D
on the parallel port. Using Ned's software in basic for recording
HEP's from outside the earth environs. It's doing a good job of it.
I'm trying to get the pulses to a more compact situation for
portability. It will record and average, the software will, the
photons no matter how many or how few. I dont have to worry about the
stamp as the speed is taken care of and averaged in the software. I
want to use the stampplot pro as thats on one of my computers and
would seriously want to use it as it saves to a floppy without a
lotta voodoo going on. I currently have been reading the Sun and the
Galaxy center, the moon and certain stars and some other unidentified
sources. This is just the beginning as I want to show some kids how
easy this is and how interesting. I'm a disabled Korean war vet at 67
with Cardiac problems to name a few. I just want to do this. and its
fun. Science is one of most beautiful things when in the right view
point. I went in as a computer lead man for Control DAta Corp, then a
broadcast engineer, then an analytical chemist. Physics is the one
love I have always had and will never give up.
Thanks, Jim
> Jim,
> How fast are the blips you want to capture? I know very little
about radio
> telescopes, but all DSP projects require first estimating the
bandwidth of
> the recorded signal, and then sampling at a minimum of twice the
highest
> frequency of interest (Nyquist theorem). With real-world noisy
signals, it
> is better to sample at 5-10 times the highest frequency of
interest. Other
> issues include first low-pass analog filtering the received signal
to avoid
> distortion due to "aliasing" -- the effect that causes wagon wheels
to
> appear to be turning backwards in old western films. Also, data
streaming
> for continuous plotting over 6 hours might require "double
buffering" to
> avoid missed data. That means sending data to one data array while
> simultaneously writing out data from a second array, and then
switching the
> arrays.
> All these tricks of the DSP world have been done for decades with
some
> pretty slow computers (in my case, event recording from low-energy
nuclear
> particle detectors), so my best guess is that you can do them
better and
> easier with the newer generation of Stamps.
> Dennis
> (A former physics grad student who switched to biophysics.)
>
>
Original Message
> From: James Hardy [noparse][[/noparse]mailto:jahardy33@h...]
> Sent: Thursday, December 14, 2000 10:01 AM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] A/D 0831
>
>
> Is there a simple way of using the 0831 to measure the output of a
> radio receiver and graphing it to stamplot2?
> I have the Industrial controls book and the BOE kit?
> I made the temp circuit and it worked.
> Instead of two traces I only need one and it needs to graph a
minimum
> of six hours.
> Can this be donesimply or what do I have to do? I really need this
> for my radio astronomy receiver recording.
> Thanks if you can help
> Jim