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Why i like multi frequency

March 30, 2019 03:07PM
My experience is with the V3i (2.5kHz - 7.5kHz - 22.5kHz). I hunt 90% of the time with all 3 frequencies turned on. While it eliminates a little bit of depth, it tells me quite a lot.

When I'm hunting school, parks and yards, and digging from surface to about 7", i find it extremely helpful. Those 3 frequences are represented by independent VDI's and on my spectrograph, i can see how the frequences break down on a scale of -95 to +95. Very rarely do i dig a desired target where at least 2 frequences don't indicate a VDI that closely groups on the spectrograph, creating a bell curve - generally all 3. Sometimes, i'll see a bimodal display - two humps on the spectrograph where one might be well into iron, and the other in nonferous. It's very easy to have a single frequency get confused by a target, but i find it rare that all 3 are confused...when in that 0-7" range and not masked. I use stereo audio where one ear hears all signals (positive or negative) while the other hears only those i've selected in discrimination. I can hear everything in the ground and if i have both ferrous and nonferrous, i can hear them at the same time.

I can tell when i have a bottle cap 90% of the time, simply by how those 3 frequencies respond, but i can't do that with a single frequency. I typically dont use bottle cap reject. Monte's quick pass is pretty effective on this case for single frequency, but i knew the answer before going to quick pass with 3 frequency spectrograph.

There are times that EMI or mineralization cause me to choose a single frequency, but it isn't common. I can also select my filter frequencies and choose between 2 settings between on each of 5 (but that is a different, more detailed discussion and one i've not mastered). White's offers beach mode which is helpful in both wet sand or farm fields, but also alkali conditions which solves mineralization sufficiently when ghost towning.

So, when might this break down and cause me to look to single frequencies?

Limitations:
1. Iron - the lower frequencies are certainly more attractive to iron and i do dig a lot of square nails that give off good single direction VDIs. At times, i'll choose to eliminate 2.5kHz to limit my response to iron after my first pass.

2. Max depth VDIs. when reaching the max depth of having any meaningful VDI data, it becomes less helpful. A deep nickel (6-10") may ring up with a decent VDI at 22.5kHz, but ring up in a negative range at lower frequencies. When this happens, the response is less attractive to the ear and more likely to cause me to think i'm hitting iron - both the audio response and the VDI/Specrograph are indicating i may not like this target. However, when switching to just 22.5kiHz or even 7.5kHz, i now get jumpy, but mostly positive VDI's where 2.5kHz is soundly negative. I have come to learn when i have a deep nickel, when the VDI may be in the 60-80's (Penny/dime/quarter) even though i'm expecting a VDI of around 20. Same is true of deep gold. I proved this to myself by rehunting a place i've hit many times with my V3i, and picking it pretty clean, and then hunting it with my single frequency MX sport. I was able to find half a dozen low conductors, most deep nickels and a token and a gold ring that i had missed before probably because my 3 frequency response was not consistent enough at depth limits.

3. Modern pull tabs - afraid it doesn't help here. These often look like nickels or rings - while they generally ring up 2-10 higher on the White's VDI scale, i am certain i'm leaving some nickels, gold and occassionally small silver jewelry if i don't dig these.

Hopefully this is useful!

Brian
Subject Author Views Posted

Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

Monte 157 March 30, 2019 11:05AM

Surprise, surprise! Attachments

glabelle 100 April 01, 2019 04:55PM

What frequency am i really anyway?

Rich (Utah) 72 April 02, 2019 08:06AM

Re: What frequency am i really anyway? Attachments

glabelle 69 April 02, 2019 11:08AM

Frequencies and Analysis

Rich (Utah) 70 April 02, 2019 03:28PM

OOOOPS N/T

Rich (Utah) 53 April 02, 2019 08:06AM

Surprise!

Rich (Utah) 59 April 01, 2019 08:35PM

Re: Surprise, surprise!

WM6 58 April 01, 2019 06:27PM

Re: Surprise, surprise!

glabelle 49 April 01, 2019 09:55PM

Re: Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

glabelle 66 April 01, 2019 10:02AM

Single / Selectable / Multi-Frequency.

Rich (Utah) 78 April 01, 2019 04:00PM

Re: Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

WM6 70 April 01, 2019 12:52PM

Re: Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

NWCindy 59 April 01, 2019 06:00PM

Re: Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

Kickindirt 88 March 30, 2019 09:01PM

Why i like multi frequency

zincoln 104 March 30, 2019 03:07PM

Re: Why i like multi frequency Hey Brian

Kickindirt 94 March 30, 2019 09:11PM

Re: Why i like multi frequency Hey Brian

zincoln 91 March 31, 2019 07:37AM

My name is Rich and I’m a multi-freq’r. thumbs up N/T

Rich (Utah) 59 March 31, 2019 09:04PM

My name is Monte and I'm a multi-frequency user, too!

Monte 78 April 01, 2019 02:33AM

Re: Why i like multi frequency Hey Brian

Kickindirt 74 March 31, 2019 11:24AM

Interesting topic N/T

Rich (Utah) 66 March 30, 2019 01:48PM

Re: Some 'traveling thoughts' on Single or Selectable Frequency Vs Simultaneous Multi-Frequency.

jmaryt 96 March 30, 2019 12:36PM

My old standby of single freak 6.59 kHz works for meWhite's Electronics N/T

Hombre 85 March 30, 2019 11:39AM



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