lobo st coinshooting

[Anonymous]

Recently I had the opportunity to test a variety of detectors at our club hunt. I was surprised at how well the Lobo ST performed as a coinshooter using the 5x10 coil. This fellow only had that coil and has gone back to Texas and our local dealers do not stock that detector. Consequently I have no way to find out how much(if any)deeper it would go with the 9x8 or other wider coils. Has anyone tried this experiment and can give me some idea of the performance,relative to the 5x10,of these other coils?It would be very interesting to see how versatile this machine can be. <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">

 

[Anonymous]

and I used the brown, 8" open-center concentric coil on it, and the 3x7 elliptical concentric when in trashier sites.
Yes, the stock elliptical widescan coil can do 'OK' in many applications, but I preferred the brown 8". I went with other models and parted with my Lobo SuperTRAQ, but still hold high respect for it. Just before I sold it I tried out a couple of other coils, to inlcude the 8x9. If I were to get another LST (and it is one of two favorites in their line today and I just might), I would get two coils for it. The 8x9 and either the 3x7 or the new 5¾" round coil. I prefer a concentric coil to a widescan for most coin hunting applications, and so equipped, the Lobo ST is a very good coin, jewlery and relic hunting unit.
It has a superior VCO audio pinpoint than anything else Tesoro offers today, and the Disc. mode operation can be a little 'quieter', too.
<EM><STRONG>Monte

 

[Anonymous]

How much depth is lost if the discrimination on the LST is raised to accept only coins?

 

[Anonymous]

as with most makes and models, will usually reduce the responsiveness to those targets it is closer to rejecting.
That is, if the Disc. level of the LST is set at about the 1½ mark you will have the best responsiveness to ALL coins, from the US 5¢ to the higher-coinductive silver 10¢, 25¢, 50¢ and $1 coins.
If discrimination is increased to reject good-sized foil yet is just-below the acceptance of a nickel, you'll likely see a loss in depth on the nickel but little, if any, on the higher-condutive targets.
By "<span style="background-color:#ffff00;">coins only</span>" are you asking about an acceptance setting that would respond to ALL coins? Perhaps you don't mind sacrificing the 5¢ coin and you want to rejecty pull tabs or screw caps? If the rejection level is increased to reject most pull tabs & pry tabs you will lose the nickels.
If it is a very high setting to knock out the tougher challenge tabs, you will be nearing screw cap rejection and will experience some loss of depth on the modern zinc cents, as well as Indian Head cents and many early 'wheatback' cents from 1909 to the early/mid 1920's.
At a screw cap rejection setting, those zincs and Indian Heads will be discriminated out and you will start to cut in on the detection depth of the copper cent and dimes as they are the next up on the conductivity range.
As you increase the discriminate level you inrease the range of conductivity you'll be responsive to ... and you will also be inreasing the amount of bias rejection to the ground mineral. Higher disc. level means more bias to the ground signal, and that makes it tougher for the circuitry's filters to process and pass along a good target signal.
As to the 'amount' of depth loss, that is going to be more difficult to figure because the level of mineralization (ground phase) plays an important role in this. <STRONG>Rule is this: <EM>For best depth and target responsivness, use the absolute minimum discriminate level you can tolerate.</EM> </STRONG>
One more comment. A lot also depends on how the detector was designed and where the Ground Balance control is set. If set too positive on some makes and models, especially a lot of Tesoro models, you can increase the Disc. level and reject a large silver dollar or half-dollar yet still accept the US quarter. There's just no 'perfect' answer.
<EM><STRONG>Monte

 

[Anonymous]

<FONT COLOR="#ff0000">"One more comment. A lot also depends on how the detector was designed and where the Ground Balance control is set. If set too positive on some makes and models, especially a lot of Tesoro models, you can increase the Disc. level and reject a large silver dollar or half-dollar yet still accept the US quarter. There's just no 'perfect' answer." </FONT>
Is this true on models such as the Eldordo uMax? I thought that on manual GB a slight (1/8-1/4) positive setting was better. Or did I misunderstand?
BW

 

[Anonymous]

I used to have a lot of fun teasing folks using a Bandido or Pantera. I keep a silver Morgan dollar in my pocket because I have, from time to time, encountered some models from a few manufacturers that were factory preset too negative or too positive. I used the dollar when I adjusted the trimmer.
When someone has asked for help, or especially when I am using one model and a 'smarty pants' with a Bandido or Pantera doesn't know that I like those models and tells me his unit is better, I ask to see it.
I drop a zinc cent, dime, quarter and silver dollar on the ground and use whatever I have to sweep over them. I reject the zinc cent and he/she hears the response to the dime, quarter and dollar.
Then I ask to try their unit and, <STRONG>without them noticing me thumb the GB all the way positive</STRONG>, after I have rejected the zinc cent, I sweep over the other coins. <EM>USUALLY</EM> the quarter will respond and sometimes the dime, barley, but the dollar will generally be rejected. Makes for a fun eye opener and a laugh when they respond with something like .. <EM>"Gee, maybe that's why I haven't found a silver dollar yet!"</EM>
Ground Balance and Discrimination are somewhat similar in that they are adjustments that are there to accept or reject or just 'ignore' a signal. A signal that ranges anywhere from a very low level (ground usually produces a signal of about 1Hz to 2 Hz) on up thru high conductors. If you were looking at a sine wave cycle and graphed at where ground signal, iron, and the silver dollar are, you would see that the silver is at the far (let's say almost at 180°) right side of the upper portion of the sine wave. I am not electronics tech or engineer, so I won't try to explain it all, but trust me, what happen with a heavy dose of Discrimination and a maxed GB adjustment (positive) is that it shifts the highly conductive silver dollar, and sometimes silver halves, into what you can consider the "ground" segment and they are rejected.
Some models on the market do not discriminate high enough to even knock out a zinc cent and higher so they <EM>usually</EM> wouldn't have this problem.
It's a fun experiment to try with YOUR manually GB'ed model.
Now, as for setting the GB afield, I USUALLY set it to be right on the money or very, very slightly positive on a manually GB'ed model. However, if I am working a highly mineralized site and only hunting in the Disc. mode (not using AM for pinpointing or searching), then I will sometimes GB just slightly negative. Enough that I enhance the performance of the Disc. mode and reduce the amount of bias to the bad ground signal, but not too negative that I get false signals. I refer to this technique as "Power Balancing" and it is performed in the Discriminate mode with models such as the Bandido series, Eldorado and Tejón.
Have I confused you? Questions? Shoot me an E-mail. MonteVB@comcast.net
<EM><STRONG>Monte

 

[Anonymous]

I used the LST with the 9x8 coil coin shooting for awhile here before I switched to the Cortes. It is a serious coin shooter as well as a great nugget and relic hunter. I switched to the 9x8 coil on it for 2 reasons. A bit more depth and easier pinpointing.
Doug-Iowa

 

[Anonymous]

I've always believed it better to ground balance slightly positive (sound increase very slight as coil moves toward the ground) with my Bandido 2mmax, if I was unable to get a real good balance (no increase or decrease in sound). But, what you say makes sense, if I am understanding it correctly. A slightly negative ground balance allows the machine a slight increase in depth when in Disc mode? I usually hunt in all metal and thumb to disc mode when i get a good signal and center it. I don't know if this would change whats best for ground balancing.

 

[Anonymous]

<FONT COLOR="#ff0000">"Enough that I enhance the performance of the Disc. mode and reduce the amount of bias to the bad ground signal, but not too negative that I get false signals</FONT>."
I guess what I was thinking ivolved false signals. I had thought if the GB was set negative you would be bothered with false signals and therefore by setting the GB slightly positive I could eliminate this problem.
Thanks for the answer, Monte. I'll have to try that experiment.
BW

 

[Anonymous]

Hello Joe <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="">
I am In the uk and use It with the 9x8,,,
This Is a Charles 1st half groat i found last week.I have placed a US 1990 one cent and a UK penny for size.