SURF PI HELP

[joop]

- Offset should be set to maximum sensitivity, without the SURF PI chattering to much.

- For ringing check the output of the first opamp with a scope. If there are multiple pulses then increase the resister value. There should be a single pulse visible.

- No use to increase depth, there is a third order relationship between power and depth. You will quickly drain your battery!

[daverave]

i am trying to set up my surf pi....can anyone tell me how to adjust the offset on the 1st amp...my coil is 18T 30 swg and 400uH...there is no ringing even with the 390 ohm damping resistor...should i change this value ???? should i increase the tx pulse to give me a little better depth if so how do i increase the tx power...pls advise on these problems.