Greetings,

I have a new SDR release ready. Since I don't have a working PC-Lab 711S A/D
card I can't test the new release with this board. If you are a SDR user
using this A/D card please give it a try and let me no if it works or
doesn't work with your board.

The new release can be downloaded here:
http://www.seismicnet.com/sdrdocs/sdr.htm. I have also update the
documentation (the part I hate the most!) reflecting the new changes to the
program. Since I have made some changes to SDR, mostly on how it handles the
interrupt from the A/D card and memory management, I'm calling this version
4.0b. The changes I made allow SDR to record up to 8 channels at 100 samples
per second (or less) or up to 4 channels at 200 SPS. Before SDR would only
use up to 6 of the 8 channels on the A/D card and it didn't have the 200 SPS
mode.

Also new with this release are two new menu items controlling the new
STA/LTA triggering. I added a LTA Minimum field that controls how low the
LTA (Long Term Average) number can go. This controls the overall trigger
sensitivity for the channel. The larger the number the larger the event (or
noise) will have to be to trigger the channel.

I also added a field that controls how long the channel stays in the
pre-trigger condition. The default is 10 seconds.

Before upgrading, replay and extract any event files. The new version can
not use the old daily record files. New ones will be created when you run
the new SDR release.

As always let me know if you run into any problems.

-Larry Cochrane
Redwood City, PSN







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