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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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

Visit our Forums HERE to download the owners manual for the new F75 LTD!

First Texas Products is launching 2 hot new versions of their flagships…the T2 ltd and the F75 ltd…limited edition versions with additional modes… Cache and Boost! Read the rest of the story for the full flyer…

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Electrical Interference

First Texas Products & Fisher Labs August 2009

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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I knew that Engineers at First Texas Products have been working on several new accessory coils for their Fisher and Teknetics line.  Here’s the list of either what’s “out” or soon will be…

I’ve had a lot of questions about the innovative F5 over the past few months.  This is a feature break down I did that was posted on Kellyco’s site.  Hopefully you’ll find it useful

Fisher F5 Field Test

Mark Ellington

Fisher F5 Face

I was given the wonderful opportunity to do some field testing with Fisher’s amazing new F5. The F5 is one of the most unique detectors I’ve put my hands on in a very long time! The perfect blend of cutting edge, software driven power meshed with the feel of good old fashioned knobs. I find it very interesting that the “oldest name in metal detecting” is utilizing the newest technology! The F5 is the result of Fisher’s self proclaimed “war on bad user interfaces”. The lead Engineer on the F5 was Jorge A. Saad.

Since Fisher Laboratories came under new management, the Company has not been resting on their laurels! First out of the gate came the incredible F75, followed by the mid-range F4. Next up was the affordable F2, then recently the incredibly deep F70. That leads us up to the innovative F5!

The F5 is situated in the familiar F2/F4 housing, but the electronics are entirely different. This platform was designed by Engineers Jorge Saad and Dave Johnson (with John Gardiner and Mark Krieger additionally lending their talents) to offer outstanding discrimination, depth and ID capabilities. You’ll find the F5 mounted on the familiar gold and black “S” rod which has proven its ergonomics and durability throughout the years.

*Click below to see the rest of the review*

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Thanks to Mike Scott and First Texas Products, you’ll have your choice of:

A Fisher detector bag or a Teknetics detector bag!

Fisher Detector Bag

Teknetics Detector Bag

How to win: Simple!  I’m going to do this the “old-fashioned” way!  Post your name in the “Win a free metal detector bag!” post and I’ll have my 5 year old niece randomly draw one from a hat on June 1st!  I’ll contact the winner via the email in their registration (to keep emails hidden on the forum).  Follow the link below to visit the forum.  You MUST be a detectorstuff member to post.  Have fun, and good luck!

Fisher’s World Treasure News 2009! 

Fisher was kind enough to send it our way for distribution…if our servers can take the downloads!  By the way, overlook the mediocre writer in there named “mark”

*Update* WTN is now posted for download on Fisher Labs Website…get it HERE!

*reprinted by permission of First Texas and Dave Johnson

File: El Paso Chapter GPAA talk 12 Feb 08 Dave Johnson minor update 25 march 09

The History of Metal Detectors, with Emphasis on Gold Prospecting

Dave Johnson, Chief Designer @ FTP & Fisher

Good evening! My name is Dave Johnson, and I’m the Chief Design Engineer for the world’s largest manufacturer of hobby type metal detectors located right here in El Paso. The brand names we manufacture include Fisher Research Lab, Bounty Hunter, Teknetics, and a number of private labels. I’ve been designing metal detectors for 27 years for several different companies, so there’s half a chance that if you swing a metal detector, I had something to do with it.

My presentation this evening is on the history of metal detectors, with an emphasis on gold machines. I’m not here to sell my company’s products, but it’d be downright discourteous of me to show up and not bring some literature and a Gold Bug 2 to demo. So after the meeting if anyone is interested I’ll be happy to talk with you.

* * * * *

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