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Two independant signal amplifiers...WAY TO GO FISHER

A

Anonymous

Guest
I think I understand now. The Senstivity control and the Threshold controls are independantly controlled signal amplifiers.
I know the in the past, I and others have referenced a squelch control, but my air test is showing different.
Looking at the chart, you will see that Threshold affects depth more than Sensitivity.
Sensitivity is the base amp, much like a pre-amp, and Threshold is the primary amp.
To explain the chart:
At each Sensitivity setting, beginning with 0 and stepping up to 10, I tested multiple Threshold settings, beginning at -95 and stepping up to +4. A clad quarter was used as the target. The depth is not revelant to the ground, it is only revelant to looking the Sensitivity/Threshold relationship. Test was conducted in my living room with lights and the TV on. <img src="/metal/html/glasses.gif" border=0 width=15 height=15 alt=":geek:">
Sensitivity at a -95 Threshold is the signal base with the Threshold amp activated.
I may be technically incorrect, but the theory makes sense to me and helps me to understand how the two controls relate to each other, which will help me set up in the field, and how to trade off settings due to interference, trash, etc.
Happy CoinStriking <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol">
 
Sure saves me a lot of testing. This bar graph is great as well as your other Charts. What do you do in your spare time. <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol">
 
Well....He's gonna be doing a LOT of reading in his spare time! <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol">
 
Since I am lucky to get out 2 hours a week, I won't get much dirt experience very fast, so I got to fiqure out as much as I can inside the house in order to make the outside trips more productive. Plus I bought the CoinStrike for very specialized hunting. My testing just proves I made the right choice. This past week, I had to do my taxes, so no hunting for me <img src="/metal/html/cry.gif" border=0 width=40 height=15 alt=":cry">
You ever hunted a site that the first few inches were full of modern aluminum trash? The CS has a setting to beat that. Ever wanted to hunt gold rings in a park without having to dig all the aluminum foil? The CS has a setting to beat that too, But you'll never find it unless you test.
Happy CoinStriking <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol">
 
Man that's a passel o work, dang if i did alla that i wouldn't have time to detect, == I think you did a nice job tho, looks good to me, I just know glass stuff.
Hang in there <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D"> <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D"> <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D">
 
That is VERY complete!
For grins I tested a small yellow gold childs ring (found with the 1270) at various settings on the C$
While I didn't go into detail like you and don't have a graph <img src="/metal/html/wink.gif" border=0 width=15 height=15 alt=";)"> here are the results. Basically I was trying to find various settings of sens & thres that produced the same results. A complete graph would be very similar to yours as far as linearity of distance to settings.
Small yellow gold childs ring about 1 gram in weight
<UL><LI>Sens-10 thres -65 = 5 1/2"
<LI>Sens-8 thres -35 = 5 1/2"
<LI>Sens-5 thres -5 = 5 1/2"</UL>
FWIW Tom
 
I am unable to print out the entire bar chart you posted;the four right side columns keep getting cut off.Any ideas?? <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">
 
When I tried to print it out, it prints in "portrait". When I changed it to print in "landscape" it still dropped the last column.
It may be easier for me to email the jpg file or the excel spreadsheet.
Let me know which?
Happy CoinStriking <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol">
 
I expected to see that! Thanks for validating it.
This is one machine where stability should not equate to a major loss of depth <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D">
This is what I see happening.
The Sensitivity control affects all the targets signals. As I raise it, all targets "look" bigger. Not stronger, but bigger. As I lower it, all targets "look" smaller. Not less strong, but smaller.
The Threshold settings from -99 to 0, raise the signal strength by lifting it against a preset limit. Close to zero, the higher it is raised, the closer to -99, the less it is raised.
Thus I can take a weak or "small looking" signal at low sensitivity and "raise" it up or strengthen it to respond better, or I can take a "large looking" signal and reduce it's strength and lower it in regards to that internal level.
Bill's 525 setting works so well in trash because:
With Lots of targets in the ground-a high sensitivity setting makes all of them look bigger, and they tend to merge into even larger signals that want to mask whats beside and beneath them.
By lowering sensivity setting, he is able to make the trash "look" smaller, so its easier to see the other signals beside and below them, even the ones that don't yet register because they are too small to overcome that internal limit. And yes they are made smaller as well.
Then he is able to use the Threshold setting to "raise" or increase the strength (not size) of all the target responses, so that even the ones that couldn't be heard due to what ever reason, depth, or too small etc, have now been lifted above that internal level and now can be seen and heard.
Coupled with the super fast response speed, its a killer combination.
I still need to word smith this some more to get it just right, but thats whats going on.
A +1 setting raises the tiniest of targets into the audio range.
At +2 and up, the Threshold changes, and begins to chop off the lower conductivive and weaker (smaller) signal. At this point, you can use the threshold settings as a "blanker" feature. At +2, micro aluminim trash is removed. At +3, most foil range targets are blanked, but nickel range stays. At a +4 setting, all Foil and Nickel range targets are blanked out.
So...there is alot of power contained within these two controls. The defining criteria seems to be how many targets are in the ground, including trash, electrical interference present, and what you are looking for specifically.
Example, modern park full of alum trash and I am looking for those diamond rings. If I disc out foil, I loose the diamonds. If I dig all the foil, I loose enjoyment. But if I make the targets look small, then raise the sensitivity to a +2 to raise the signal <STRONG>and</STRONG> blank out the small foil trash, and look for those solid sounding foil/nickel reading...viola..I am diamond ring hunting. Same thing, for those large gold rings, set small, raise threshold to a +3 to raise the signals and blank the foil and dig the strong nickel and tab targets...
Ok...typed out.
The CoinStrike is a pretty exciting machine and I get pretty excited about it:lol
 
Save the pic to your puter then when you open it you can rotate it clockwise 180 deg then print it. Should fit that way.
Tom
 
I've never noticed any blanking of targets with positive threshold settings, but I've never tried it either. I will as soon as I can.
Thanks and keep posting what you learn.
HH'n
 
with the foil/ring settings you recommend, I can't stand to use the + threshold settings. I have tried for over a year to come up with a setting to eliminate small shallow foil bits and get rings in the range below nickel. A lot of foil likes to read around 7 and thats where also where small rings can land (the ones with rocks). <img src="/metal/html/frown.gif" border=0 width=15 height=15 alt=":(">
Tom
 
Thanks fellas!I printed it out in "landscape" and just sketched in the data for the last column.Good enough for someone mainly interested in the information.You did a nice job on the graphics anyway Mike;everything took a lot of work. <img src="/metal/html/shocked.gif" border=0 width=15 height=15 alt=":shock"> Perhaps with the next larger size paper the whole thing would come out with the "landscape" setting.Many thanks. <img src="/metal/html/please.gif" border=0 width=29 height=15 alt=":please">
 
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