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

April 01, 2019 10:02AM
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 154 March 30, 2019 11:05AM

Surprise, surprise! Attachments

glabelle 97 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 68 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) 58 April 01, 2019 08:35PM

Re: Surprise, surprise!

WM6 56 April 01, 2019 06:27PM

Re: Surprise, surprise!

glabelle 48 April 01, 2019 09:55PM

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

glabelle 65 April 01, 2019 10:02AM

Single / Selectable / Multi-Frequency.

Rich (Utah) 77 April 01, 2019 04:00PM

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

WM6 69 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 87 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 92 March 30, 2019 09:11PM

Re: Why i like multi frequency Hey Brian

zincoln 90 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 77 April 01, 2019 02:33AM

Re: Why i like multi frequency Hey Brian

Kickindirt 72 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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