[daip] Re: SDA in VLA datasets

[Tim Hankins]

Douglas,
  A thought and a question about your observations.
1. What was your observing frequency?
2. Several years ago we did a project to obtain single pulses and
average profiles from Vela at many frequencies using the phased array
mode. Vela is so strong that we could never get the off-pulse levels
correct; the Automatic level control started to operate at each pulse.
Its time constant is longer than the pulse width (actually somewhere
between 0.5 and 3 seconds depending upon the antenna, as I recall from
some measurements by Bill Coles about 10 years ago.) Could it be that
the AGC recovery during your off-pulse sampling window could cause
artifacts? 
  Tim Hankins