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[TenTec] RE: More About Clix

To: <tentec@contesting.com>
Subject: [TenTec] RE: More About Clix
From: w9ac@arrl.net (Paul Christensen)
Date: Fri, 1 Feb 2002 07:24:06 -0500
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
> 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
> >>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.
> 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
> 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
> display. It's hard to describe.
> Markers can be used to measure delta freq and delta time. This is how
> 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
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