Hi guys. This is turning out to be a very interesting post! One of the reasons we go slow with the sweep speed is that it takes the computer a bit of time to reset, and id you have targets in close proximity to each other, then so you don't mask over targets, by carrying the signals from one to another, or avoid the nulling, you sweep very slowly, particularly in trashy ground. This is especially true in relic hunting when you're likely to come across lots of iron rubbish from house sites. I'm speaking from my experience on some of the goldfields here in Australia, and your goldfileds might be a bit different. But where I go, the scrub is dense, there's a lot of undergrowth, and often raking the ground is required before detecting, or you miss targets. In other areas, the ground is relatively clean, but there's so much building rubbish buried, like iron, aluminium, etc, that a small coil, and slow sweep speed to allow the computer time to reset itself is important. I don't know enough about the Explorer to say you can distinguish between round objects, etc. With the Quattro, you can roughly tell the size of an object buried, by coming at the target from different angles with the coil, till your mind's eye gets an idea of the size of the object. To a great degree I have found that when coin hunting, I can tell it's a coin using both the signal and the "size" I've determined from my moving my coil over it. But to go by coil alone, I don't think you can be definite each time. but it is an interesting thought to pursue a bit more, I reckon. You gave me something to think about a little more.
I was thinking Mick, that if you're going for certain relics, then a little discrimination is handy. I don't discriminate anything out because I personally go for everything. I might mention that a lot of our relics here fall into the negative number readings, with a different range of signals from deep, low tones to medium and mellow tones, stuff like buttons, some of the coins, trinkets, buckles. Sometimes the relics also will jump from a postive reading, immediately to a negative one. There is some inconsistancy with the readings, but I found by picking up on the very first initial signal of the target, it's usually the signal and numeric reading I go for as being the 'true' signal of that particular target I'm hunting for. Just one of the nuances of the Quattro I learned over time.
I thought I'd post of photo of one of the relics I found of which it's signal gave me a negative number reading of between -7 and-8. It was found in damp soil conditions, amongst a heap of rubbish. It's something I would have walked away from if I'd ruled out these readings in discriminating. So depending on where you go, maybe try leaving out a discrimination pattern alltogether, and see what you pick up, and dig negative number readings with low or mellow tones.
Angela
