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Dual Frequency on V3i?
- Thread starter JV
- Start date
Larry (IL)
Well-known member
You can select three frequency (Best Data) or any one of the three frequencies or Correlate Mode which is the best two frequencies of the three for any given target, 22.5 and 7.5 or 7.5 and 2.5. So yes, you have one, two or three frequency modes. Correlate Mode hunts in three frequencies but automatically chooses the best two frequencies to compare the return signal.
Rob is correct though, you can not select two of the three frequencies and hunt in just those two.
Rob is correct though, you can not select two of the three frequencies and hunt in just those two.
Larry (IL)
Well-known member
7.5 is the best frequency to use with the Bigfoot, but 2.5 will also work, just not as well on low conductors.
On recent drops for coins & jewelry I much prefer using 3 frequencies with the BF. Play with it some. It does this weird thing where it pushes the low conductors way up the vid scale and that makes it easier to develope programs that help to eliminate the tabs while still getting a majority of the gold rings.
johnedoe said:
This is a photo of pull tabs I detected . I wanted to see how they would respond to the BigFoot using the different frequencies so I set the detector up using 3 frequencies, the 7 kHz, and 22 kHz frequencies and then checked their VDI using an eclipse coil and that's how this chart is set up. The first column is the 3 freq. with the BF, 2nd col. is 7 kHz with BF, 3rd col. is 22 kHz with BF, and the 4th col. is the eclipse coil using 3 frequencies and the VDI's for it. You'll notice how high the VDI's are using the 22 kHz frequency with the BF. The first tab VDI's at 37 using 3 freq. and the eclipse coil while the BigFoot running at 22 kHz VDI's the same tab at 80. You'll also notice that using 3 freq. with the BF VDI's a number of the tabs at 54. This is the same VDI that a Zinc penny and a nickle VDI at using the BigFoot and 3 frequencies. This is because the VDI numbers get skewed on the lower Conductors when using the 3 frequencies on the BigFoot. Fortunately there's not very many of the tabs that VDI 54 in the field so using the spectragraph it's easy to tell the zincs from the nickels as the 22 kHz freq. hits the hardest on the Nickels while the 2.5 kHz hits hardest on the zincs. Using the fact that the tab VDI's get Skewed it has allowed me to develop a coin and jewelry program that eliminates most of the tabs while still getting most of the 95 gold rings that I've found over the years. Try these as a start. Using the BigFoot coil and 3 frequencies accept these VDI's. +10 to +36, +40 to +46, +48 to +54, +57 to +64, +68 to +93. Good Luck! Disclaimer: Pull Tabs in your area may vary from mine so test your local tabs and design a program that works best in your area.
You can Ground Balance the BigFoot in 3 frequencies and do it just like you would on any other detector, (at a 45 degree angle). You don't always get the single beeps when doing the GB but it doesn't effect it much anyways as it doesn't get much depth and it's not looking at that much ground due to it's narrow design. To be honest, I usually don't bother ground balancing the BF on my V3i. I just start hunting and let it track and balance itself as I'm just looking for shallow, recent drops. .
Larry (IL)
Well-known member
It is no more distinctive than any other coil. The secret to digging gold rings is to devote your time to places more likely to have lost gold rings and dig every signal in the gold range. The advantage to the BF is more coverage per swing at the expense of less depth.
If you are looking for an advantage to finding more gold rings, you will have to get a waterproof detector and hunt the beaches in chest to neck depths, be willing to hunt where most other water hunters avoid.
If you are looking for an advantage to finding more gold rings, you will have to get a waterproof detector and hunt the beaches in chest to neck depths, be willing to hunt where most other water hunters avoid.
