Current WAPP Capabilities

I. Single Pixel Spectral Line

1. 195kHz to 50MHz Bandwidth
   • 2 channel, 3-level autocorrelation, 16384 lags/channel
   • 2 channel, 9-level autocorrelation, 4096 lags/channel
   • 3-level Stokes, 8192 lags/product
   • 9-level Stokes, 2048 lags/product
2. 100MHz Bandwidth
   • 2 channel, 3-level autocorrelation, 8192 lags/channel
   • 2 channel, 9-level autocorrelation, 2048 lags/channel
   • 3-level Stokes, 2048 lags/product

II. ALFA Spectral Line

1. 195kHz to 50MHz Bandwidth
   • 2 channel, 3-level autocorrelation, 8192 lags/channel
   • 2 channel, 9-level autocorrelation, 2048 lags/channel
   • 3-level Stokes, 4096 lags/product
   • 9-level Stokes, 1024 lags/product
2. 100MHz Bandwidth
   • 2 channel, 3-level autocorrelation, 4096 lags/channel
   • 3-level Stokes, 2048 lags/product

III. Pulsar Modes

• 50MBytes/s max for correlator board
• >50MBytes/s max for EDT/computer
• 38MByte/s max data rate to disk

The best resolution for a 100MHz bands, using 16 bits/lag, and summing the polarizations are given by the formulas,

     #lags = (i - 1)* 6.25,  where i = integration time in usecs
     Data rate to disk = 12MBytes/s;  Resolution = 100MHz/#lags

• Direct Sampling

  2 channels,continuous sampling

  Bandwidth(MHz)	Data Rate Mbyte/s	Bit Packing
  50	25	1
  25	25	2
  12.5	25	4
  6.25	12.5	4
  3.125	6.25	4
  1.56	3.12	4
  0.78	1.56	4
  0.390	0.78	4
  0.195	0.39	4