Category Archives for Fisher

Fisher F75 SE on deep silver dime

F75large-popUpeditHi everyone…here is the next in my ongoing series of metal detector tests on the same deep silver dime.  Up to bat is the Fisher F75 SE.  So far, this one knocks it out of the park as “best” at giving me a “DIG ME!” signal on the dime.  Like I’ve said before though, lots of variables to consider from ground moisture to undetectable RF noise.

Fisher CZ3D on a deep silver dime

Fisher CZ3D

So, my current mission to test all the metal detectors in my stable against a deep silver dime in my test garden continues.  Now…remember…variables is a key word here.  Meaning, time constraints won’t let me test all of the machines on the same day…and I have witnessed numerous times that the exact same metal detector can NOT get the dime one day and then (with identical settings) can get it the next.  The variables I’m talking about are ground moisture, “invisible” RF interference, etc….heck, it could even be moon phases, gov’t conspiracies and UFO’s for all I know.

So, this take this test for what it is…different detectors on the same targets but on different days.  Up to bat today is the venerable Fisher CZ3D.  The original CZ design is dual frequency and originally the brain child of Dave Johnson.  It has had many iterations since with the last being the 3D.  This is a design that goes back to the late 80’s/early 90’s!  Amazing that it still holds it own against the modern crop of metal detectors.

Ethics and the art of recovery

*reprinted with permission of First Texas Products*

ETHICS AND THE ART OF RECOVERY
First Texas Products takes pride in the industry we serve, and ask you to join us in observing and promoting ethical and legal detecting practices, and in supporting dealers and organizations that do the same.

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Fisher Gold Pan kit!

Do you have a case of “Yellow Fever”?  With gold prices consistently high, more and more people are out searching for that wondrous yellow metal.  Gold has always captured the imagination of mankind.  Read more about gold and its history HERE (link to wikipedia).  Fisher (of metal detecting fame) recently released several gold prospecting/panning kits.  Now, I’m first to admit it, I’m a TOTAL NOVICE when it comes to gold panning!  However, like most who first venture into prospecting, I’ve done a ton of research about how to “get started”.  Youtube can be a wonderful thing for learning panning techniques!  Below, you will find my review of Fisher’s new Gold Prospecting Kits and my experiences as a new guy trying to learn a new art… (Click “read more” to…well, read more!)

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New Gold Prospecting book by Fisher’s Dave Johnson

Fisher and Teknetics Chief Designer Dave Johnson has written an AWESOME book on gold prospecting with a VLF metal detector!  Tons of great information for prospectors and potential prospectors…as well as folks who just want to “learn more” about metal detectors!   Special thanks to Dave Johnson and Mike Scott for allowing me to reprint the book in it’s entirety here on www.detectorstuff.com !

VISIT the brand new Teknetics website HERE!  http://www.tekneticst2.com/

*reprinted with permission of First Texas Products*
www.fisherlab.com

Gold Prospecting
with a
VLF Metal Detector

Dave Johnson, Chief Designer
First Texas Products & Fisher Research Labs

This book explains how to use a VLF induction balance metal detector for gold prospecting. The author has nearly 30 years’ metal detector design engineering experience and has designed machines in every major metal detection technology category.

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Fisher to release new Gold Bug metal detector!

I just got my hands on a sales flyer for a new Gold Bug gold hunting metal detector from Fisher Labs.  Very, very interesting set of specs.!  One thing that definitely has my attention… 19 kHz frequency and the mention of relic hunting possibilities!  (think lead and brass!)…also check out the last item under “Controls and Features”…an optional 11” DD coil!  Could this be an awesome nugget buster and a monster relic machine?  Can’t wait to start hearing field reports!  Discuss in our FORUMS HERE

-Mark

Gold Bug

Gold Bug

Electrical Interference Essay by First Texas Lead Engineer Dave Johnson

Electrical Interference

First Texas Products & Fisher Labs August 2009

Dave Johnson, Chief Designer @ FTP & Fisher

Dave Johnson, Chief Designer @ FTP & Fisher

Because of the high sensitivity of modern metal detectors coupled with the proliferation of sources of electromagnetic interference, you are likely to encounter electrical interference at times during the use of your metal detector. It is important that you recognize electrical interference when present, and take appropriate measures to deal with it. This will prevent you from giving up on a worthwhile site unnecessarily, or from sending in for a repair a machine which is working properly.

Symptoms of electrical interference

Electrical interference can cause a metal detector to “chatter” spontaneously, to lose sensitivity for no apparent reason, or to cause periodic audio “wobble” or slow waves of spontaneous sound. What you’ll hear will depend on what model of metal detector you’re using, what operating mode you’re using it in, how you have the adjustments set, and what the source of the electrical interference is. The most common manifestation is spontaneous chatter.

All metal detectors are susceptible to electrical interference, but they vary in what kinds of electrical interference affect them. In a given environment some metal detectors may be affected by electrical interference whereas others may not.

Two metal detectors of the same model in the same environment may be affected differently, because of minor differences in operating frequency or because the controls have been adjusted differently.

Common sources of electrical interference

Common sources of electrical interference include: overhead electric power lines, underground power lines, other metal detectors, telephone lines carrying electronic data, computer systems, electric fences, old CRT-based televisions, cell phones, thunderstorms, fluorescent lights, metal vapor lamps, military aircraft with electronic warfare countermeasures turned on, electric motors, VLF military communications systems, and automobile ignition systems. It will sometimes be the case at home, in the showroom, or in an urban environment that there are several different sources of electrical interference present simultaneously.

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