what frequencies does the Explorers use?

[mgtmadness]

If this is the range of the Frequencies, 1.5kHz - 100 kHz.
why not use 98.5 of these , instead of the 28 it uses?
Does it skip frequencies?
Guess what I am trying to ask is what frequencies do they use out of the Possible 98.5 + possible frequencies available?

 

[howlow666]

Well from what I understand at the time you noise cancel the detector will pick the best 28 between min and max that best suites the site you are on. Thats what I am lead to believe, hope this helps.


Jay

 

[stasys]

it use all the time all 28 frequencies! its not related to noise cancel, its what I understood.

 

[Chris(SoCenWI)]

You are correct on the frequency range, but there is an infinite number of frequencies in this range, not just 98.5. 1.5 khz is a frequency and so is 1.500001 khz.

What the minelabs do is send a couple(maybe it is three) different frequency square waves to the transmit coil. These square waves are used to generate signals across the frequency range. Different metals and different soil conditions favor certain frequencies; a detector might see a target in some instances better at a lower frequency, while other conditions will give a better response at a higher frequency. Analyzing many close together frequencies, i.e. 1.5 khz and 1.6 khz isn't going to tell you much.

If you hold the search coil close to your headphones and press noise cancel you can hear the machine shift through the channels. What it is doing is slightly shifting the frequency of one of the base square waves which in turn slightly shifts the value of the higher frequencies. If I remember correctly the machine doesn't always analyze 28 frequencies for all noise channels, frequencies that end up close to harmonics of power lines are ignored.

Chris.

There are some patents and white papers that are findable on the internet that explain the theory of this in great detail. Not a real easy read.

 

[howlow666]

Wow that sounds very interesting indeed. Will have to go find it if I can thanks for the info.

 

[mgtmadness]

I didn't feel like putting that many numbers in the post, so I just did the 98.5 thing.

 

[dewcon4414]

Chris did a good explination ill add my 2 cents. There are 11 channels that produce 28 harmonics or Frez. Unlike the Sov where these are pre set at 1.5 kHz the 28 are random for each channel. It appears that the three stronger frez are used to get a good average as well as ground balance. One of the experts i know said for the most part the average freq used is around 3 kHz. I read some of the patents that they recently were updating alledgely for a new machine. I wished we could get someone like a Jeff Foster to write a book on the Explorer for us techno kind of guys. His books on the white machines are a great read for anyone using a detector.

Dew

 

[BarnacleBill]

http://www.minelab.com/__files/f/11043/METAL%20DETECTOR%20BASICS%20AND%20THEORY.pdf

 

[Chris(SoCenWI)]

n/t

 

[Monte]

Chris (SoCenWI) gave you enough to do some "head scratching."

It can really be a struggle trying to sort out some of the marketing stuff (hype??) from virtually all manufacturers from time to time, and I'd have to say that Minelab has accomplished the art of maximum confusion on the topic of operating frequencies.

There isn't a single detector manufacturer that has gained my 100% loyal following for their entire product line. I like Garrett for an excellent pin-pointer and a budget TID entry in the Ace 250 w/4