Here's an interesting test, Shows strongly a DD coil will enhance recovery speed, better separation and reduce masking.

[Anonymous]

Using a T-2 and MXT, Here are the distance each detector could separate in both audio and visual ID using a small sheet of pressed paper over a clear grassy area. The T-2 had a slight edge over the MXT using the DD coil. Even more so with the MXT using the concentric coil, Concentric coils actually reduce recover speed and separation.

I set the T-2 with the 3 tone feature, This allowed the copper penny to give a higher tone over the zinc penny. With the MXT, Used the relic mode with full discrimination, This allowed the zinc penny to give a low tone and the copper a higher tone.

Both detectors have a quick recovery speed as long as the MXT is fitted with a DD coil, But the T-2 did have an edge and could get in tighter and respond to the two closest pennies still having an audio and visual ID. The T-2 is quicker and noticeable, It does have an edge.

With the concentric coil, The MXTseen both zinc and copper pennies as one signal. Only when I separated the two pennies further appart as shown with the two lowest pennies did it respond to both in audio and visual ID.

Paul (Ca)

 

[FrankMD]

Hi paul. Thanks for the informative post. That's very interesting.

As the same engineer designed the T2 and the MXT I was thinking that the T2 was designed after the MXT so maybe he advanced the design furthur.

 

[Anonymous]

Thanks Frank,

I feel when Dave Johnson designed the T-2 he new a DD coil would help the unit reach new untapped levels of performance, The T-2 DD coil or circuitry does have an edge over other top end detectors.

Another thing to remember, The MXT DD coils are really designed for the DFX and will work on the MXT so maybe a loss of sensitivity is occurring on the MXT when using the DD DFX coils? Regardless, The MXT with the DD coil is allot better than concentric coils. Which is why it's important for the T-2's future smaller coil to be DD and elliptic would be nice, Maybe an 4" X 6.5" elliptic DD.

Thanks again Frank,
Paul (Ca)

 

[Low-Boy/LCPM]

You are the man Paul and you make it very easy and very hard for me to make up my mind now...You should make a video and I should shoot it and edit it for you. You have to be one step ahead of NASA Tom with all the detectors you use. You should also be helping on the next generation of detectors but I know that would take away from the fun you have doing your history and detecting. I hear there are a few of old towns near Ione that are just sitting on someones land. If you can do some history searching for me I can see if I can get permission to hunt and you can come up and hunt with me????????

 

[JoeR]

Paul,I have noticed that the target separation and recovery time improve as you increase the gain on the MXT.Since DD coils are less troubled by ground minerals than concentrics gain can be increased more.This might account for part of the difference between these coils on the MXT.Does your T-2 exhibit a similar result with increased gain?I also wonder if part of the T-2`s edge might come from a faster microchip;it is several years newer than the MXT.

 

[Anonymous]

Hello Joe,

We have to remember the MXT DD coils were designed for the DFX, Later before the MXT came out they took into account to have the MXT operate off the same coils as the DFX. I feel this may be a disadvantage to the MXT as the DFX coils are not really truly designed for the MXT, I may be wrong here but it does make sense.

Dave Johnson did a fantastic job on both the MXT and T-2, Both detectors having great performance and both having features the other does not have.

I'll try the increased Gain on the MXT and compare them again, Will even increase the T-2 gain and see where the results fall. Could be the T-2 has a slightly edge due to the coil and the faster microchip enhances it even more, Both detectors are still top notch.

Paul (Ca)

 

[Cody]

Good interesting test comparisons. You might consider that a DD coil has a narrow detection "hot strip" so will have a more narrow separation by design. Also, the T2 is a two filter designed detector which also has faster recovery. There are trade offs in that a two filter also has a little more matrix and other external noise so with high gain will get a little unstable in some situations.

 

[FrankMD]

Hi Cody. The MXT is a two-filter unit as well.

http://www.whiteselectronics.com/mxtengineerw.php

 

[Cody]

I was not sure if the MXT was a two filter design or not as I have used several of them. So it pretty much comes down to the coil as far as you are concerned which may be correct.