- Posts: 1447
- Joined: Wed Aug 18, 2010 4:08 pm
- Location: Worthing, West Sussex
- Been thanked: 1 time
Lower frequencies have a longer wavelength/further apart which makes it more sensitive to higher conductive targets. Lower frequencies tend to do better in mineralized ground, but are not as sensitive to small targets.
Minelab e-trac / Teknetics T2 SE
The ground signal is mainly caused by tiny bits of iron/rust, whose size is such that your detector would need to operate at MegaHertz to pick them up well. But the higher the frequency your machine operates at, the better it gets at responding to the ground, and the harder it becomes to seperate target from ground.
But.... targets have a 'best frequency' for detecting them at. Milled silver/copper/bronze coins, for example would be easiest to find with a 5 KHz machine. Cupro-nickel coins, ringpulls, ladies gold rings would be easier at 20 KHz. Tenth-gram gold nuggets would be best hunted with a 50 - 100 KHz detector. (it's not to do with the wavelength of the detectors signal - that is about 20 miles, not coin-sized).
Take a look on Minelab's website, there are a couple of good technical PDF's explaining detector operation.
Thank You Again
- Posts: 515
- Joined: Sat Aug 20, 2011 2:27 pm
- Location: Derbyshire.
One Ive thought of asking myself.
Brilliant easy to understand replies too from Barnet / Fusion Thanks lads, every little helps. =D>
- Posts: 36
- Joined: Fri Aug 26, 2011 6:37 pm
- Location: Zwaag, The Netherlands
Anyway I used a GMP and other detectors, sensitivy as high as it could go, 0 discrimination, all metal (relic). Searching for mostly iron, and had some very good finds. Even at those settings the detector was quiet most of the time, so I had to use my shovel to see if it was still working. No one was there (besides detectorists) for centuries, so NO junk.
The areas where we searched were old Byzantine forts, which were destroyed by the Turks after they took over the area. Everying was pushed over the sides of the mountains, so there were the finds; difficulty in searching? YES. And that is not including the pointed barbs on the trees and plants, and all the tree ROOTS, and sliding down the sides (some were too steep to hunt).... but fun.
Because I was searching for only really iron artifacts I used as low of a frequency as possible, to go deep. So I would agree with the answers and think about what you want to find. If your want only iron, set you detector for that, if you want only no-iron, set your detector for that. But use your ears first, meter second.. I usually go over a field with a High Frequency and later (if there were good finds) go again over the field with the lowest frequency that the detector can use.
- Posts: 551
- Joined: Tue Apr 19, 2011 5:36 pm
- Location: Lowestoft
- Has thanked: 12 times
- Been thanked: 16 times
Roughneck Micro Shovel / Evolution Dagger
Best finds: Henry VI Annulet Issue Calais Halfgroat & medieval seal matrix
For my youtube detecting videos please go here: