Paul--
Man, you are absolutely right. I really just wanted people to know that you
can measure just about anything given the right test equipment. I don't
really appreciate it enough, but one of the great advantages of my job is
that I do have the unbelieveable luxury of getting my hands on this stuff
whenever I need it. My problem is I don't have the time to play around with
it.
R,
Al
> -----Original Message-----
> From: Paul Christensen [mailto:paulc@mediaone.net]
> Sent: Friday, 01 February 2002 5:10 AM
> To: Ten Tec
> Subject: Re: [TenTec] RE: More About Clix
>
>
> The operative word here is "reasonable." Al, I don't
> disagree with your
> statement in the least, but for most of us, securing a vector signal
> analyzer simply isn't an option for our measurements.
>
> -Paul, W9AC
>
> ----- Original Message -----
> From: "LORONA,AL (A-USA,ex3)" <al_lorona@agilent.com>
> To: "Ten Tec" <tentec@contesting.com>
> Sent: Friday, February 01, 2002 0:59 AM
> Subject: [TenTec] RE: More About Clix
>
>
> >
> > I posted a reply about measuring "microchirp" yesterday but
> it never made
> it
> > to the list. Here's my second try:
> >
> --------------------------------------------------------------
> ------------
> -
> >
> > >>You can't. In fact, I know of no electronic instrument capable of
> > >>reasonably detecting it. Sometimes the ear is the best
> judge. The
> keyed
> > >>waveform oscilloscope display has no association with
> frequency shift.
> >
> > >>-Paul, W9AC
> >
> >
> > In fact, you can. You need an instrument that can capture a
> signal without
> > missing any data and then play it back while displaying
> frequency vs.
> time.
> > Such an instrument is called a vector signal analyzer.
> >
> > The VSA scrolls through a display of the spectrum of the
> signal. In this
> > way, the horizontal axis is frequency and the vertical
> axis is time. If
> the
> > plot is in color, the color can represent amplitude. This
> type of display
> > format is called a "spectrogram". I think some PSK-31
> programs (like
> > Digipan?) show the spectrum; just imagine successive
> spectra scrolled in
> the
> > display. It's hard to describe.
> >
> > Markers can be used to measure delta freq and delta time.
> This is how
> folks
> > measure the start-up transient behavior of PLLs and other
> oscillators,
> and
> > how law enforcement agencies positively identify a
> specific transmitter
> by
> > it's start-up "fingerprint".
> >
> > Al W6LX
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
|