homebrew bandido

[mykaitch]

Hi, been out testing another head I made on the beach (con coil). It seems to be very good at picking up rocks about four inches down

Why is that ???

[Qiaozhi]

Hi, been out testing another head I made on the beach (con coil). It seems to be very good at picking up rocks about four inches down

Why is that ???

Did you take any of the rocks home to try detecting them in an air test?
Also, did the signal disappear when you removed the rock?

[Koala]

If your other coil is fine on that beach try adjusting your ground balance. If the coil is larger than the other you my also need to reduce the sensitivity.


I built the Bandido and used it for about a year. With a small coil it's one of the best in fields full of iron. However it's very touchy on the ground balance. One way it will give false signals. The other and you loose a lot of sensitivity.


On my lawn it was better than my IDX. It's always hard to compare as you are never detecting the same fields in the same conditions. But I felt that over the year my finds rates went down. I did consider fixing the ground balance in one position as if you manually ground balance over some bad ground the sensitivity to silver is halved.

[Nexus]

Hi, been out testing another head I made on the beach (con coil). It seems to be very good at picking up rocks about four inches down

Why is that ???

Because salt water on the beach and those hot rocks are two different signals by phase shift. If you reject the salt water the hot rocks stay in detection. If you reject the hot rocks the salt water stay in detection. Removing them both would require more than one notch filter working at the same time.