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

April 01, 2019 09:02AM
Couple of comments. This is from Minelab's site:
"Multi-IQ is Minelab’s next major innovation and can be considered as combining the performance advantages of both FBS and VFLEX in a new fusion of technologies. It isn’t just a rework of single frequency VLF, nor is it merely another name for an iteration of BBS/FBS. By developing a new technology, as well as a new detector ‘from scratch’, we will be providing both multi-frequency and selectable single frequencies in a lightweight platform, at a low cost, with a significantly faster recovery speed that is comparable to or better than competing products."

This is of course marketing speak, but the bottom line is that Multi-IQ is a little different than their FBS/BBS. The signal coming out of the transmit coil has been measured, and it is indeed simultaneous multi-frequency. It appears that FBS/BBS used a square wave (which naturally contains odd harmonics of the fundamental). I think the V3i also worked on this principle. The trick is now how you analyze the received signal at various frequencies. The V3i seems to analyze each of the frequencies, then reports what each returned, and a VDI based on the combination of these. The processor must be very fast in order to do this as you swing the coil. I had one, and the recovery time between targets was too slow for me, compared to a single frequency machine.

Multi-IQ outputs a complex waveform consisting of multiple frequencies in square wave form. It should result in a transmit signal that is just as strong at the low freq., as it is at the high. Whatever they do in analyzing the return signal, it is fast. To start, probably a faster uProcessor. In practice, it is fast enough to give you a satisfactory quick recovery time between targets. They claim to give you better ID of targets at depth. Many are reporting that this is true, I have yet to test it. However, in theory, it makes sense that if you can compare the phase of the return signal at different frequencies that you will at least have more information with which to work than with a single frequency machine.
Subject Author Views Posted

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

Monte 440 March 30, 2019 10:05AM

Surprise, surprise! Attachments

glabelle 310 April 01, 2019 03:55PM

What frequency am i really anyway?

UtahRich 230 April 02, 2019 07:06AM

Re: What frequency am i really anyway? Attachments

glabelle 231 April 02, 2019 10:08AM

Frequencies and Analysis

UtahRich 226 April 02, 2019 02:28PM

OOOOPS N/T

UtahRich 199 April 02, 2019 07:06AM

Surprise!

UtahRich 229 April 01, 2019 07:35PM

Re: Surprise, surprise!

WM6 219 April 01, 2019 05:27PM

Re: Surprise, surprise!

glabelle 191 April 01, 2019 08:55PM

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

glabelle 255 April 01, 2019 09:02AM

Single / Selectable / Multi-Frequency.

UtahRich 305 April 01, 2019 03:00PM

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

WM6 241 April 01, 2019 11:52AM

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

NWCindy 227 April 01, 2019 05:00PM

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

Kickindirt 286 March 30, 2019 08:01PM

Why i like multi frequency

zincoln 279 March 30, 2019 02:07PM

Re: Why i like multi frequency Hey Brian

Kickindirt 286 March 30, 2019 08:11PM

Re: Why i like multi frequency Hey Brian

zincoln 298 March 31, 2019 06:37AM

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

UtahRich 201 March 31, 2019 08:04PM

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

Monte 234 April 01, 2019 01:33AM

Re: Why i like multi frequency Hey Brian

Kickindirt 232 March 31, 2019 10:24AM

Interesting topic N/T

UtahRich 231 March 30, 2019 12:48PM

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

jmaryt 296 March 30, 2019 11:36AM

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

Hombre 254 March 30, 2019 10:39AM



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