psdayama wrote:

What is bandwidth required? There is good 'winscope' available free
for frequencies upto 20Khz.

Bandwidth required is whatever the sound card can provide....so 20 kHz
is fine. But the WINSCOPE I have found (by Konstantin Zeldovich) is
limited to a 50ms scan time. I want to measure time differences of up
to at least 100ms so this is not adequate.

But thanks for your suggestion.

Steve