On many discrimination detectors (notch type) you will hear broken or clipped signals. The more trash present, the more prevalent these signals will be. These clipped signals indicate the detector’s attempt to analyze what it’s “seeing” in the ground. Remember that good targets produce acceptable audio signals in both directions of your sweep. If you receive an acceptable target signal in one direction only, slow down and attack it from different angles. Try to come up with that solid, acceptable signal from left to right, and from right to left. It may well be a good target that is being masked by a junk target close by.
A very common occurrence in trashy areas is the signal that sends your meter far to the right, indicating a “dollar coin.” More than likely this will mean that you have detected a large trash item. Crushed aluminum cans just beneath the surface will often be the cause. If this happens, lift your coil off the ground about one foot. If the signal is still strong, pass it over. If the signal decreases or disappears, retrieve the target. Aluminum cans simply overpower the detector’s circuit (because of their size) producing a signal similar to an acceptable object, but remembering to raise the coil in instances such as this will save you needless digging.
Let’s briefly review again how to attack those overlooked trashy sites.
1. Reduce your detector’s sensitivity and depth of signal.
2. Use manual tuning if possible.
3. Use a sniper-type coil.
4. Analyze the signal produced by the prominent trash in an area.
5. Keep your coil approximately 1 to 2 inches above the surface.
6. Learn to identify the targets indicated on the meter with accuracy.
7. Move slowly and deliberately.
Another option for your consideration is; of course, to clean out all the trash from the site, then go after the valuables. It will certainly work, but I don’t know many individuals who have the time to do it. I firmly believe that a simple understanding of your detector’s capabilities and a little common sense will also do the trick.
It’s easy to rush to a site and label it worthless – it’s the smart treasure hunter who studies it and plans an attack. Besides coins, the rewards are mastery of your detector and the satisfaction of succeeding under the most adverse circumstances.