Frequency discrimination?

[Mick in Dubbo]

I'm quite impressed with what I'm reading about the V3 and would be interested to know how using the 3 different frequencies are at IDing targets, ie pull tabs and gold rings eta. Is using the dominate frequency, plus watching how the other 2 frequencies behave, a more reliable system of figuring out targets than compared to the numeric display?(assuming that you don't have adjacent targets.) What I am saying, is it more stable?
Thanks.
Mick Evans.

 

[mickfin]

Yes Mick the V is more stable, I had mine 4R four months N i just sent it off to Whites 4R the 1.3 Upgrade Nice Name, Mickey Lewis

 

[Mick in Dubbo]

Thanks for your reply Mick. I realised that I didn't define what I'm asking very well. I meant, is a more reliable system than the numeric system? While it is a totally different form of discrimination than what is normally used, I'm curious as to how reliable it is in comparison to the numeric display. Given that different frequencies behave differently to targets made of different materials, is it something that you can trust more than the numeric display, or is it skewed as easily? I suspect that it would behave in a very similar manner as a Garrett Ininium. That is it's method of it's discrimination, but gives you the feed back via a mixture of high and low tones. Having a numeric display combined with the frequency info would seem to make this to be a very powerful discrimination combination. I'm interested to know if that is in fact is what is happening in the real world or not.
Mick Evans.

 

[jgedde]

The V3 doesn't use the three frequencies as another layer of discrimination. It uses one of two modes to process the three freqs: best data or correlate. In best data, the best signal of the three is used to display the VDI. In correlate, it uses all three in a manner that I haven't studied in detail. I haven't used correlate extensively as it is clear that depth is lost: on deep coins, the 22.5 kHz signal is faint or nonexistent and correlate seems to reject targets in this case. Correlate does, however, work rather well in iron fields where most deep targets are masked anyway.

In general, it's up to the operator to view the analyze screen and note the relative amplitudes of the three signals to determine the likely target.

I mentioned the idea of using the amplitudes and non-normalized VDI from the three frequencies as another layer of discrimination to Carl a few weeks ago and I got the impression that White's is already working on it and may employ three frequency type discrimination in a future model.

Oddly enough, despite owning the most advanced detector on the market, I find myself using the VDI display and analyze less and less as I get more adept at using the detector. Tone ID, and the sound of the audio tell me most everything I need to know. I mainly use analyze at this point to discriminate between bottlecaps and coins when using DD coils.

I will say this: a Dankowski style test garden with deep objects, close trash, and iron masking thrown in goes a long way in getting the most from the V3. As we well know, there are a multitude of settings and adjustments; experimentation is the rule of the day to finding what works and what doesn't.

 

[mickfin]

Hi Mick Iv ben Detecting for 21 years now N have had alot of Whites units , The Vision can Lock on a VDI # better then the DFX did , But Like all Detectors the Deeper the target the more the VDI # Varies , If i compare my
Eagle II SL 90 and my Vision with the VDI #s will that anser your Question???? Mickey Lewis

 

[Mick in Dubbo]

Hi Mick and Jgedde.
I think we're starting to get there. It's hard to communicate your thoughts into words sometimes so that the meaning is understood. You can't beat face to face. It's interesting Jgedde how after having the best visual cues on a detector, that it's the ears that work better. I found the same with my old Explorer. Despite having the smartfind screen, it's actually setting it up to hear the long tones that make the Explorer more able to tell you what's going on under the coil. It comes down to just knowing the detector that you are using.
I'm thinking about using the information that you get off the 3 frequencies when you have the pinpoint trigger locked in the forward position as well as the normal pinpoint mode when all 3 frequencies move accross the screen at different strengths, to show which frequency is dominate on that particular target. When the trigger is forward (alternate search mode) and say the low frequency is the dominate one on a silver coin, but if you go over a gold target, the high frequency is the dominate frequency, that is what I'm referring to as frequency discrimination. Whites may have another term for it, so I'm pleading ignorance here. THIS, is the information that I'm interested in and knowing about how reliable it is compared to the numeric display. Numeric display are fairly generic in their reliability regardless of brand or make. Using the analyse screen with the three frequencies displayed on it as well as being used in the normal pinpoint mode, is however a completely new type of information that is now available and it's this information that I'm interested to know how reliable it is. Yes I know that other near by targets are going to interfere with it, but how does it go on a target that is on edge, deeper or in wet sand?
Thanks for your patience.
Mick Evans.