Bob, Geoff

This was quite helpful as it was a question I had been wondering about as
well.



PauLC
W1VLF



 -----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@.................
Behalf Of Bobhelenmcclure@.......
Sent: Tuesday, July 03, 2007 9:41 PM
To: psn-l@..............
Cc: gmvoeth@...........
Subject: Re: Period


  On 3 Jul 2007 03:44:57 gmvoeth@....... wrote:
  Winquake needs a FFT waterfall display to see a movie like of shifting
frequencies over time.
  Possibly in 1024 sample chunks advancing one sample for the next 1024.
  Nothing fancy, Black and white and shades of gray,  totally suitable.

  Hi Geoff,

    WinQuake does not have a waterfall display, but it does have a useful
procedure for viewing a scanning spectrogram. Here is how:

  (1) Set "X Scale" to the time interval window you want to use for an FFT.
You will get a slider button on the bottom of the screen which will allow
you to view any portion of the event record.

  (2) From the menu bar, select "Calculate", "FFT...", "View Only". An FFT
plot will appear.

  (3) From the menu bar, select "Window", "Arrange". You can then
simultaneously view the windowed event data and the FFT for the window.

  (4) Use the slider button to scan through the file. As the event data
slides through the window, the FFT display will update almost continuously
to display the spectrum for the data displayed in the window.
(Unfortunately, the scale for the FFT may change as well.)

  Bob
  PSN Station REM
  Locust Valley, NY





----------------------------------------------------------------------------
--
  See what's free at AOL.com.





Bob, Geoff
 
This was quite helpful as it was a =
question=20
I had been wondering about as well.
 
 
 
PauLC
W1VLF
 
 
 
 -----Original=20
Message-----
From: psn-l-request@.................
[mailto:psn-l-request@...............On Behalf Of=20
Bobhelenmcclure@.......
Sent: Tuesday, July 03, 2007 9:41=20
PM
To: psn-l@..............
Cc:=20
gmvoeth@...........
Subject: Re: Period



  
On 3 Jul 2007 03:44:57 gmvoeth@....... wrote:
Winquake needs a =
FFT=20
  waterfall display to see a movie like of shifting frequencies over=20
  time.
Possibly in 1024 sample chunks advancing one sample for the =
next=20
  1024.
Nothing fancy, Black and white and shades of gray,  =
totally=20
  suitable.
  
 
  
Hi Geoff,
  
 
  
  WinQuake does not have a waterfall display, but it does =
have a=20
  useful procedure for viewing a scanning spectrogram. Here is =
how:
  
 
  
(1) Set "X Scale" to the time interval window you want to use for =
an FFT.=20
  You will get a slider button on the bottom of the screen which will =
allow you=20
  to view any portion of the event record.
  
 
  
(2) From the menu bar, select "Calculate", "FFT...", "View Only". =
An FFT=20
  plot will appear.
  
 
  
(3) From the menu bar, select "Window", "Arrange". You can then=20
  simultaneously view the windowed event data and the FFT for the =
window.
  
 
  
(4) Use the slider button to scan through the file. As the event =
data=20
  slides through the window, the FFT display will update almost =
continuously to=20
  display the spectrum for the data displayed in the window. =
(Unfortunately, the=20
  scale for the FFT may change as well.)
  
 
  
Bob
  
PSN Station REM
  
Locust Valley, NY



  

  

  See what's free at AOL.com.=20