Hi Charlie -

I have attached 3 jpg files:
1) OS38 that goes bad half way through.  No data file sent for this, but the OS150 data was collecect in the 1st hale (good data area)
2) OS150 showing the interference from the 38kHz
3) OS150 detail showing the 38kHz interference.

The interference occures when the OS30 (master) and the OS150 (slave) are run in non-triggered mode.  
This asynchronous ping mode is preferred because we get much more Os150 data when not slowed to the OS38 ping rate.

Question is can this interference be identified and either marked bad (NAN) or delete the single ping ensemble entirely?

Peter and I would appreciate your comments and guidence.

Many thanks,

Shailer