Re: Trucks at 10 Feet and New Mag On The Block??

[Mark]

There is a PI design on the market now - The VibraProbe. The selling points for it are:


- It vibrates when near metal, which makes it good for use with headphones (for the main detector), or near surf - so that you need not strain to hear a beep.


- It's waterproof - so again, it's good near the water.


However, the detection range is less than 1 inch.


I think if low cost / simplicity are needed, PI seems like overkill. A design factor I failed to mention the first time around is the need for a small coil. I picture the whole 'coil' fitting into a 1" (or so) diameter PVC pipe, with the coil at one end and the circuitry at the other end (maybe inside the pipe, maybe in a box)...


Carl - You mentioned a VCO design - is there a reference to this type you could point me towards (no pun intended!)?


thanks - Mark

[Mark]

Re: Suggestions for a 'pinpointer' design

There is a PI design on the market now - The VibraProbe. The selling points for it are:


- It vibrates when near metal, which makes it good for use with headphones (for the main detector), or near surf - so that you need not strain to hear a beep.


- It's waterproof - so again, it's good near the water.


However, the detection range is less than 1 inch.


I think if low cost / simplicity are needed, PI seems like overkill. A design factor I failed to mention the first time around is the need for a small coil. I picture the whole 'coil' fitting into a 1" (or so) diameter PVC pipe, with the coil at one end and the circuitry at the other end (maybe inside the pipe, maybe in a box)...


Carl - You mentioned a VCO design - is there a reference to this type you could point me towards (no pun intended!)?


thanks - Mark

[Dale Seppa]

Re: Trucks at 10 Feet and New Mag On The Block??

Terrence:


I STILL thing the most affordable rapid possiblity for your search


is a good two box detector although there is no doubt a good mag


would be better. A lot of time I (me-moi-yo) don't get to use "the


best" and just have to make do with what I can get. If only


(really) ten feet I guess I would have a lot of probing in already.


Anyway, the following, IF AS ADVERTISED would solve your problem.


CST Corporation.


LOCATOR FINDS FERROUS OBJECTS 15 FEET UNDER GROUND: Ideal for


finding steel well casings, iron pipes and valves, re-bar, corner


markers, septic tank handles and more.


Easy way to locate small nails down to 6", large nails down to 8",


marker stakes down to 7', cast iron pipe and manhole covers down to


8' and large iron tanks down to 15'. LCD display has digital and


bar graph plus audio signal. Easy grip handle. Waterproof up to


housing. Of/On, volume and sensitivity controls. MAGNETIC TOROIDAL


sensorS [note plural - das] and patented electronic balancing


circuitry. Low battery voltage indiccator. Shipping weight 4


pounds. Requires 6 AA batteries. Soft padded case. Made in USA.


US$629.99


Also, I note that the Fisher FX-3 is called a differential induction


magnetometer and they CLAIM Civil War 24 pound Cannonball down to 3


- 5 feet. You might look for a review on this unit and see if they


say anything about big targets. (I dug up Stephen Ryland's book on


the Fisher Gemini-3 and in there he shows the Fisher FX-3 good down


to about 12 feet for something the size of an automobile. So MAYBE


truck to 15 - 20 feet???


One idea is that your local utility company may well have some of


these pipe locator type of magnetometers. Based on the depth claim


for the CTS unit and the Fisher unit mentioned above, they may have


a unit which MIGHT work. Also I would think that some of the better


tool rental places might have the CTS and/or Fisher or other makes


for rent.


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