Teknetics Mark 1 air test on several coils,

[Old California]

Here are some air test results on various coils with the Mark 1, Please bear with me using a cell phone is a tough cookie keying in data on such a small key pad.

These are air test not buried test results, but will give you an idea which coils fare better for certain applications.

J-Rob mentioned his 7.25" coil air tested a quarter at 10-11" inches, my test results using the same coil and a quarter were very similar. Off by an inch but that doesn't mean one detector fared better than the other, ones hearing or minor differences may effect the outcome of test results. Regardless, These are to help inform a Teknetics user which coil they may like to purchase in the future for certain types of hunting.

Starting with the stock 7.25" coil, here are the test results.

7.25" Teknetics coil......(Penny..10-11") (Nickel..11-12") (Quarter..11-12")
8" Bountyhunter coil, ..(Penny..9-10") (Nickel..9-10") (Quarter..10-11")
10" Teknetics coil,...(Penny..12-13") (Nickel..12-13") (Quarter..13-14)
12" Teknetics Hothead..(Penny ..13-14") Nickel..13-14") (Quarter..14-15")
7"X10" Fisher F-2/F-4 DD coil,..(Penny..9-10) (Nickel..10-11") (Quarter..10-11")

Overall, The stock 7.25 Teknetics coil is a good coil for both separation and decent depth. Plus, Less acceptable to EMI over the other coils. Also, Suprisely the 12" Hothead fared a good inch over the 10" Teknetics coil, so some truth to what's said on larger coils they will detect deeper.

Paul (Ca)

 

[J-ROB]

Thanks for that database of coil info, Paul!

Yeah an inch plus or minus is nothing to fret about in an air test. I have a bunch of electronic equipment on in the room where I did that test and that might be enough to throw it off. ~10" with a 7 inch coil is not bad in any case.

Here are a few pics of two of my Marks. The Mark 1 is on a White's pole and the Mark III has an interesting aftermarket accessory mount for the meter that raises it up and out beyond the handle for easier visibility. Great addition for the old "U" pole.

I should note that the 7 inch coil pictured does not balance as well as the 10" on the White's pole. Too nose light.

On the other hand, the 7 inch balances great with the stock pole...perfectly balanced right at the end of the handle near the toggle switch. With the big coil, you have to hold the coil up a litttle bit and that makes the whole exercise more fatiguing on the old wrist. Really, with the 7" the original pole isn't that bad.

 

[Old California]

Those are beauties J-Rob, I like the raised meter assembly on the Mark III, never seen one of those sure makes viewing allot easier.

Used to have the same type Mark 1 as yours, same color and it too was modified. With that model, I added a Whites female coil connector to the backside of the meter housing so the unit would accept both Whites and Teknetics coils without an adaptor. Actually both coil connectors were mounted behind the meter housing above the handrest.

You have two neat detectors there, I'm envious wish my Mark III mod was completed. Won't be at least 2-3 months down the road before I can get to it.

Did you ever figure out how to bypass all surface finds from foil to clad down 4-5" inches yet be able to detect deep coins only. The Mark 1 can do this, if not I'll share here on the forum how to setup the Mark 1 on this neat setup.

Thanks for sharing two of your hottest detectors, real jewels for sure.
Paul (Ca)

 

[J-ROB]

OK Paul, let's hear the "surface blanking" trick!

Blocking out the first 4-5" sounds scary...Some of the older stuff i've found was only a few inches deep but I can see how this tactic could be quite useful in a known fill dirt area or where lots of landmowing or tree droppings have caused soil buildup.

In fact that trashy woods right next to my house if full of junk in the first two-three inches but there is a church at least 100 years old 150 feet away. It would be nice to pick up some Barbers from the 1905 church picnic while skipping the 1970s bum wine screwcaps!

Let's hear it! I'll give it a shot and report back.

PS: Ever try the 4" from the F2? Theres some on ebay for $40 shipped. Apparently there were two generations of F2 machines and the later ones use a different 5 pin connector-- looks like a mic connector rather than the 5 pin DIN arrangement on the Tek, A Mark with a 4 incher would be a good trash machine I think.

 

[Old California]

Cool! I'll share that trick in a day or so, going to be a decent size thread let me rest my fingers got to punch in one key at time with this silly cell phone.

The 4" Bountyhunter coil is not very sensitivity when used with the Mark 1, trust me you'll loose sensitivity on smaller targets. I gave my last one away, its an ok coil for beginners but for veterans like you it's a toy. Save your money, continue using the 7.25" coil or Whites 6" shooter coil if you can find one.

Ok, you're going to be amazed with the Surface Blanket trick on the Mark 1. Great setup going after deep silver bypassing all surface finds including surface clad.

I figured this out with the Mark 1 and Treasure Baron CoinTrax many years ago, You'll bust a gut when you see how easy the setup is

Paul (Ca)

 

[J-ROB]

Typing on a cell phone??? What?

Get yourself an ANALOG keyboard, Man!!

 

[Old California]

Don't know why I never added a Blanker mod to the Mark 1, Instead made the proper adjustments to get the blanker feature when needed for deep silver in trashy areas.

Going over the Mark 1 this morning and decided to add on a Blanker mod this coming weekend, very simple mod already have the components and see were I can safely tuck them inside the bottom housing.

The cool thing about this Blanker mod is I'll be able to adjust it to ignore any depth of trash, so if I want to ignore the top three inches no problem or even go down to six inches no problem I can quickly make that adjustment.

What separates this from making the adjustments on the stock setup is now all I will need to do is flip a switch going from regular setup to blanker setup, I beleive the Big Bud has this capability but is preset for ignoring the top 3" inches, my mod will allow me to ignore any depth I desire for all types of hunting conditions.

Never seen a Big Bud up close but the Blanker feature is probitily based on what I'm going to add to the Mark 1, only my blanker mod will have the capabities of ignoring surface trash at any depth.

Bear with me, I'll post the mod end of this weekend. And share how anyone can adjust the Mark 1 to have blanker capabities. Most likely you and others will have already figured out how to Do it by then, if not bear with me and I'll share at the end of the weekend.

Paul (Ca)

 

[J-ROB]

Hey Old Cali,

Found this Mark conversion pic and I wonder if this more forward postiion for the control box might not balance better with the 7.25".

http://www.geotech1.com/forums/showthread.php?12427-Teknetics-Mark-1&p=49241#post49241

Worth thinking about before you mount your Mark on a modern pole, especially if like me you love that stock 7" coil.

 

[Old California]

Thanks for sharing the link J-Rob,

I think Doug from Oregon did the cool looking mod on the Red LTD, great guy talented individual too.

Many years ago 15 or so did a mod on a Teknetics 8500 in fact my first Teknetics mod, instead of the usual mod flipped the housing upside down. The bump from the speaker housing kept the controls from touching the ground. Worked great, eventually gave the detector to a friend.

Found a picture of it the other day, looks funny with the housing upside-down put it worked well.

Thanks again for the link,
Paul (Ca)

 

[Tom_in_CA]

thanx paul !

 

[Old California]

A pleasure Tom,

I think you were first introduced to the Mark 1 at a club meeting you had attended when the Mark 1 first came out, a dealer was there demonstrating the unit.

The Mark 1 being a two filter gets great depth but limited to good ground for top performance and iron masking really hurts separation, not my detector of choice for older sites laced with iron but for an old park still a top contender.

On another note, would be a treat seeing you and the old gang at a future park hunt rondvo. See you and the gang this year

Take care,
Paul (Ca)

 

[duggr]

Hey Old Cali,

Found this Mark conversion pic and I wonder if this more forward postiion for the control box might not balance better with the 7.25".

http://www.geotech1.com/forums/showthread.php?12427-Teknetics-Mark-1&p=49241#post49241

Worth thinking about before you mount your Mark on a modern pole, especially if like me you love that stock 7" coil.

I just got through doing a google search on the Mark-1 and found this Post!
The Geotech Mark-1 LTD Mod was one I did years back. Rob you are correct
about the balancing the different size coils for the mark-1.... I mounted the LTD
control box at a point where you could hold the handle with only your index finger
to get a Near perfect as I could get Balance for the stock 7-1/4 tek coil..
Below is a photo of my first mark-1 Mod along with some photos of most of my Teks
and some other beauties I had at one time or another...Below Is a photo of me with
the Fisher F75 back around 06...Paul it's Good to see that your still at it....
DOUG FROM ILLINOIS AKA Duggr

 

[Old California]

Hi Doug,

I remember that mod you did on the Mark 1, Very nice modification you always were good at it O'yes, I remember using the Whites Six Shooter coil too with my Mark 1 very good coil still have this coil.

Still have my Mark 1, have a Mark III too but it's still taken apart haven't had time to finish modifying it so it's laying inside a box at the moment.

Good to hear from your Doug, Hope you have a wonderful year looking forward to seeing your next mod

Paul (Ca)

 

[beau61]

Hi Doug,good looking mods you've done.I'm glad I got the "Ltd" from you.Still in MINT shape.GH in the new year.Beau

 

[duggr]

Hi Beau!
Don't ever let that LTD Go!
I'll bet there isn't another one in as good of condition as the one I sold You!!!
Good to here from you.....Doug

 

[HaroldILL.]

Hey duggar good to see you back on the forum. I tried calling you ,But lost your number. I was wondering if you noticed the XL-PRO had modulated audio in the SAT MODE? Since winter hit I was playing with it inside and noticed it air testing. I didn't get a chance to try it in the field till ground thaws. I was using the GEB DISC until I got use to the detector then winter hit hard. As you know GEB DISC. all targets sound the same so you have to stare at the meter which is a pain. I figure in the SAT MODE with modulated audio you could just listen for the softer hits then look at the meter for verification and not have to stare? Also you had one with the tone mod so I was wondering if the audio in the SAT MODE stayed modulated with the tone I.D.? I saw your video and others with the tone I.D.,But it was only shown in GEB DISC. MODE? Thanks.

 

[duggr]

Hi harold...sent you my number...Yes I noticed the Modulated audio....
[b I was wondering if the audio in the SAT MODE stayed modulated with the tone I.D.?][/b]

Harold Pay attention to 42 seconds and 1.47 seconds into the video posted below....this should help,,

Tone mod

 

[HaroldILL.]

It seems the Tone I.D. isn't that deep maybe down to 6''?

 

[duggr]

It's nothing like my old mark-1....A deep coin on the mark would send the Meter pegged to the right
and a small peep on the audio....I had a freshly buried quarter 12" deep in the yard and was able to pick
it up with the XL Pro with the Bullseye coil, sensitivity set at max, zero disc. in the disc. mode....The meter would peg
to the right as well....The Depth meter would read around 5-6 inches in the all metal mode if I remember correctly
(because of the Power setting) and It picked it up with no problem
in the AM as well....this surprised me....I imagine The Mark-1 would just barely have heard it in all metal with the standard
7-1/4 coil....The Gain control on the whites works with the all metal mode as well....These machines Particularly the
5900 with the manual G.B. would be excellent Relic cache hunters with the appropriate coil combination