Tejon air tests -interesting results

[dan b]

I set up a simple rig to do some air testing with my Tejon, seeing as how it's too cold and miserable to do much else. I will post some pictures of my results.

The first test was in all metal, running a barely audible threshold, with the tone set high (3 o'clock). The sensitivity was at 6, as anything higher caused an erratic threshold in the house. Interestingly (or should I say surprisingly), setting the sensitivity from minimum to maxed in the red seemed to have no effect on the depth results. It only effected the threshold and the amount of chatter. You will notice a pop can in the pictures. As we all run across these, admittedly in worse shape than this one, I thought I would include it. I was amazed at the depth that the Tejon could "see" the pop can. I didn't anticipate that, as you can tell by the scale only going to 18". Coin and ring depth was impressive.

The next test had everything else equal, with the exception that the discrimination was turned on and set at minimum. The results surprised me. I knew that depth is sacrificed with disc, but I didn't expect to see this big of a difference.

There are certainly some variables here that will effect real world detecting, but I think this is a fair assessment of what this machine will do (I would think that any skewed results because of being an air test in the house should be equal for both modes)

My conclusion is that if you want impressive results with your Tejon, use it in all metal. Otherwise, it's probably on the same level as everything else out there.

I have a new GTI 2500 coming, so I will repeat this test with that machine. Watch for it next month in the Garrett forum

Dan

 

[rmptr]

Nice little rig Dan,

I'll make one up this weekend and see how my machines do.

R M P T R

 

[KCK]

Great details and explanation thanks for all your work and detailed information! Pics were great!

KCK

 

[hsjrev]

A couple of weeks ago I did an air test outside on a mercury dime with the sens turned way up and the difference between all metal and disc wasn't nearly that much. All metal gave a signal on the dime at 13" and with the disc set to tab I got 12". That was with the sens turned as far as it would go into the red zone and outside away from any metal or electrical interference. I set the coil up on a large styrofoam ice chest and used a plastic ruler to measure.

 

[kdc]

[quote hsjrev]A couple of weeks ago I did an air test outside on a mercury dime with the sens turned way up and the difference between all metal and disc wasn't nearly that much. All metal gave a signal on the dime at 13" and with the disc set to tab I got 12". That was with the sens turned as far as it would go into the red zone and outside away from any metal or electrical interference. I set the coil up on a large styrofoam ice chest and used a plastic ruler to measure.[/quote]

i had the same result when i did my test. i got 11 to 11.5 on a nickel and that was with min disc. used and sensitivity a little in the max zone with the stock coil . and i done this inside the house weather was to bad to go out doors. i believe if i had the depth would have increased a little. this is the deepest detector i have ever owned personally. i have not checked it in the all metal mode yet, but will so i can keep track of its operating performance.

 

[markg]

Try straightening the coil upright so when you test it will be from side to side like in the field. My results were very impressive on the various targets used. At sen 0 I got a solid beep on all us coins to about 5-6". At sen 10 they were over 10" and my gold wedding band beeped at 14". I might add I gb like the manual stated. View my setup from a few days ago.
http://www.findmall.com/read.php?17,634411,634411#msg-634411

 

[dan b]

How do you ground balance when the ground is not a factor?

By the way, I repeated my tests today with the coil straightened out, and the results were the same.

One thing that I have always noticed since my Tejon was new, is that the threshold is never a steady even hum. It always pulsates, almost like waves. This isn't just in the house, but also in the middle of nowhere. I've seen this concern raised in the past, but I assumed that was normal for the Tejon. Is it?

Every machine I've owned, including my short stint with the Sov GT had a steady even threshold tone, except for the Tejon.

Thanks,

Dan