Hydrophone hunting tutorial for GWX - D/L links here

[Dantenoc]

excellent, will give it a try

[Keelbuster]

OMG YES. I've always wanted to do this!

Quick question: in the rpm chart it says that rpm values are _almost_ always rounded down, with the exception of high values like 27.9 -> 28. I don't really know what it's referring to, but I wonder: why not round fairly on all numbers? Was this done to better fit the data you collected?

[raduz]

Originally Posted by Keelbuster

OMG YES. I've always wanted to do this!

Quick question: in the rpm chart it says that rpm values are _almost_ always rounded down, with the exception of high values like 27.9 -> 28. I don't really know what it's referring to, but I wonder: why not round fairly on all numbers? Was this done to better fit the data you collected?

Each turn count has always been measured for 60 seconds. Often, the number of revs per minute did not represent the whole number: there was a certain amount of complete revs + part of the last one.

Example: I was measuring the turn count for one minute. Let's say at 00:58, the RPM was 27, that means 27 complete revolutions. Two seconds before one minute has passed, 28th rev started. At 01:00 this 28th rev was still not complete. It was completed at 01:02. Now how was I supposed to record this situation? I had to round the RPM either down, either up, because it was something between 27 and 28. (this is just an example, the numbers are imagined).

If there was 27.5 revs in 60 seconds, I recorded 27. The only case when I rounded up was when it was like 27.9, that means ALMOST 28 complete revs. I hope you understand what I mean

[Keelbuster]

Originally Posted by raduz

Each turn count has always been measured for 60 seconds. Often, the number of revs per minute did not represent the whole number: there was a certain amount of complete revs + part of the last one.

Example: I was measuring the turn count for one minute. Let's say at 00:58, the RPM was 27, that means 27 complete revolutions. Two seconds before one minute has passed, 28th rev started. At 01:00 this 28th rev was still not complete. It was completed at 01:02. Now how was I supposed to record this situation? I had to round the RPM either down, either up, because it was something between 27 and 28. (this is just an example, the numbers are imagined).

If there was 27.5 revs in 60 seconds, I recorded 27. The only case when I rounded up was when it was like 27.9, that means ALMOST 28 complete revs. I hope you understand what I mean

Gotcha - precision on the estimate of the rev-count was low, and prevented fair rounding, so you tended to round down unless it was obviously very close to the next number?

Kb

P.S. Sorry to be a measuring stickler!

[raduz]

Originally Posted by Keelbuster

Gotcha - precision on the estimate of the rev-count was low, and prevented fair rounding, so you tended to round down unless it was obviously very close to the next number?

Kb

P.S. Sorry to be a measuring stickler!

Exactly! No need to be sorry. My English is sometimes not clear enough.

[Canovaro]

Thank you so much for the hard work, I have been searching for a new hydro table for GWX!

[raduz]

Originally Posted by Canovaro

Thank you so much for the hard work, I have been searching for a new hydro table for GWX!

you are welcome