gpx 4000 and Electrical Interference

1. Was it a hot sunny day?
2. Did you bring your DD coil with you as a backup?

Many detectorists find that certain mineralized areas become too difficult to work on a hot, sunny day and they return at night to get the job done with minimal interference. They get some work done during the cooler hours of the morning and later, after the sun sets. Victoria is prone to some very 'hot' ground.

Too many detectorists today rely on Monoloop coils - especially those with GPX detectors. Some detector sellers even tell GPX owners to "Throw away their DD coils". But in the end, this is exactly why you should take it with you, even if you leave the DD coil in the car.

Better luck tomorrow.

Thanks for that Nero_design. What I was really meaning was electrical interference or atmospheric interference or distant electrical storms. Not ground mineralisation. The noise you get when you hold your coil waist height and try to find the loudest point to try to tune it. I don't think it is ground mineralisation. Would like to find a way of reducing or eliminating atmospheric or electrical interference. If there is such a way. I will try a DD coil on hot overcast days to see if it will reduce electrical interference.
Cheers Golddog.

Use a DD coil in Cancel mode with the response set to Inverted and the timings on Smooth mode (Enhance for 4500 users) and lastly crank the gain up a bit. Cancel deals with the interference, inverting the response makes the signals sound normal again (high/low for small targets etc) and the Smooth timings deal with the extra ground noise generated by the Cancel mode behavior which is a little like the Mono mode with a DD coil attached (pseudo monoloop mode). The bigger the coil the better the depth as Cancel mode does cut back on the depth but at least you can keep detecting.

Years ago, every afternoon late in the season in WA we would get fast moving dry thunderstorm pass through (all rumble high in the clouds and no real substance) using an 18" DD coil in Cancel mode I was able to keep detecting and managed to score some nice gold in the shallower wandery areas rather than packing it in for the day, now with the advent of Smooth and Enhance you can also ignore the vast majority of hot rocks and ground noise. Please note I would not recommend using a DD coil in DD mode with Smooth or Enhance, too much performance loss, Mono mode and Cancel mode are OK though due the extra sensitivity.

Hope this helps,

JP

Thanks for that excellent information JP, that's exactly the kind of information that I was looking for.

Cheers Golddog.