fftcall.pro - IDL data aquisition procedure for the Leuschner Dish
NOTE:  before executing fftcall, you must type "quadpulsar" in an xterm

fftcall syntax:
fftcall, filename, fsamp, nsamp, window, loops, /nlo, /noiseon

fftcall example:
fftcall, 'data/test',  5000000L,  262144L, 1024, 100

fftcall data file:
For the example above, 'data/test.tar.gz' will be saved.
The file is custom formated and must be read with dataopen.pro, see below

fftcall variables and keywords
fsamp
 sampling frequency in Hz, must be a long integer type, 10MHz maximum
nsamp
 number of samples = 2L^n, up to 2L^18=262144, must be a long integer type
window
 The number of frequency channels to save, typically 1024
loops
 The number of times that sampling will be repeated (to reduce noise)
/noiseon
 Optional keyword to turn on the calibration noise diode
Default = The noise diode is off
/nlo
 Low Voltage setting, use this if the voltage level on the sampler is within +/- 1 V
Default = The Voltage range is +/- 5 Volts

Efficiency of fftcall.pro =  {(loops*nsamp/fsamp)/(time_required)}*100
Efficiency of fftcall.pro
 time_required (second)
 fsamp (MHz)
 nsamp
 window
 loops
81.5 %
 32.2
 0.1
 262144
 1024
 10
42.5 %
 12.3
 0.5
 262144 1024
 10
30.8 %
 8.5
 1.0
 262144 1024
 10
7.8 %
 6.7
 5
 262144 1024
 10
4.1 %
 6.3
 10
 262144
 1024
 10

5.0 %
 5.2
 5
 131072
 1024
 10
7.8 %
 6.7
 5
 262144
 1024
 10

7.1 %
 7.3
 5
 262144 512
 10
7.8 %
 6.7
 5
 262144 1024
 10
5.5 %
 9.6
 5
 262144 2048
 10

7.8 %
 6.7
 5
 262144 1024
 10
9.5 %
 55.4
5
 262144 1024
 100

datopen.pro - IDL data reading function for data aquired by fftcall.pro

datopen() example:
power=datopen('data/test.tar.gz', /square)
 Efficiency - time required for datopen.pro to process a file with (nsamp=218, window=1024, loops=100):
nyles:           6 second
aquarius:    35 second
All programs are in nyles:/home/global/ay121/leuschner/
UGAstro      UC Berkeley Astronomy      UC Berkeley