Sig Pro Signum Pro: A-Gain and Amperage Trigger Guide

There is a forum "Signum MFD/MFT Modification "Pro"" we discuss upgraded Signums.

This quide explains in details how to use A-Gain (knob), Amperage Trigger (Trigger) and benefits they bring. Both Signum MFT and Signum MFD could be upgraded with A-Gain and Amperage Trigger.


Saranskii:
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As far as I understood, A-Gain doubles the function of Gain (menu). Am I right?
If I'm right, then why new GB should be done every time A-Gain knob is adjusted?

Many guys advise to do GB this way: low Gain down (E.g.: Gain on 2), do GB, then raise Gain to a comfort level (no falsings).
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asgo:
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A-Gain, as well as amperage trigger, do not double Gain (menu), it expands Gain range from 0,1 to 2xGain. New GB should be done every time you adjust A-Gain (SuchMuch Remark: if you own upgrade versions 1.0 or 2.0 then new GB should be done every time knob is rotated, in case of upgrade version 3.0 and later versions new GB could be skipped). Trigger doesn't impact GB at all.
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Saranskii:
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What does it mean "it expands Gain range from 0,1 to 2xGain"?
Does it mean:

• If Gain (menu) is set on 1 I will be able to set it lower than 1?
• If Gain (menu) is set on max, would I be able to add more Gain on top of Gain (menu)?

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asgo:
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Yes, your spotted it right Saranskii.
Cases when adding more Gain could be favorable for hunting:

• Grass is tall and coil should be kept higher above ground
  
• Hunting with phase reversed and keeping coil at height of a knee (SuchMuch Remark: so-called "knee method", check this thread: "Hoard Hunting with the Sorex", DEEP Mode had not been invented by that time and this method was widely used by Signum owners to hunt for large objects)
• Light/extra light grounds

Cases when Gain set lower than Gain (menu) 1 could be favorable for hunting:

• Completely removes non ferrous "side" signlas produced by iron on trashy sites
• Highly mineralized/mineralized grounds.

In this case depth is forsaken for non chatty metal detector behaviour and for right identification.
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needle:
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Is there a middle position for A-Gain? It would be usefull to have it.
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asgo:
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There is a mark (dot) on control box that points the middle position of knob. The position of mark is individual for each metal detector.
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Delv:
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Pls point the spot the mark is set on this picture:

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Zemleroyk
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As far as I understand, the mark is a dot located at 2 o'clocks:

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asgo:
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RE: As far as I understand, the mark is a dot located at 2 o'clocks.​

Yes, your right Zemleroyk. Position of the mark is specific for each detector
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jnior:
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As far as I understood, knob and Gain (menu) are independent settings. If Gain (menu) is set on 10 (that is exsessive I think) detectorist can add more Gain by a knob on top of Gain (menu), doesn't he? Or is Gain just limited withing the range of stock Signum?
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asgo:
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A-Gain allows to set overall Gain twice bigger than stock Gain (menu). In other words with A-Gain you can set Signum to run with Gain on 20+. With A-Gain detectorist is able set Gain lower than Gain (menu) on 1
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Rusya:
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As to Gain 20... What is the sense to have it on MFT, ain't it exsessive?

Let's say, Signum SFT (SuchMuch Remark: Signum MFT is a further development of Signum SFT) equipped with 5" coil would require more than stock Gain to be run flat, but even in this case Gain on 20 would be axsessive too.

With Gain set on 20 signal should be abnormally strong, I can hardly imagine such kind of Gain...
Is Signum MFT capable to handle such a signal, doesn't it tend to explode?
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asgo:
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Control box won't explode . However any capability should be used wisely and reasonably. I think, lots of Gain will be of need with Economy Mode switched on rather than with Turbo mode activated. . Anyway avoid adding lots of Gain when Turbo mode is switched on: signal will be strong and depth will be lost.
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SuchMuch Remark: Every time amperage (economy/normal/turbo modes) is changed new GB should be done. Every time Gain is changed a new GB should be done. That would be ideal.

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Fomicheff:
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With all these knobs, triggers and additional "power" how long would batteries last? Signum in turbo mode runs 5-6 hours, with super-turbo mode it will run 2 hours, will not it? It's obvious Signum will not be run in super-turbo mode all the time, but it would be interesting to know how long it will last on single batteries load?
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asgo:
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Knob do not impact Signum's power consumption. If turbo mode is activated and trigger is set to position "Maxi" (SuchMuch's Remark: trigger is position outwards of detectorist) then power consumption will be increased. Frankly speaking, I barely switch turbo mode on - this mode has lots of underwater rocks. If I want to add more amperage, I just set trigger to position Maxi in normal mode. It works fine and detector remain in normal mode
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SuchMuch Remark: with trigger Signum has 6 steps of amperage:

1. Economy mode Mini (Trigger is positioned inwards of detectorist)
2. Economy mode Maxi (Trigger is positioned outwards of detectorist)
3. Normal mode Mini
4. Normal mode Maxi
5. Turbo mode Mini
6. Turbo mode Maxi

PS.
asgo is working on version 4.0 that includes adjustable reactivity (4 steps). Right at the moment the latest upgrade version is 3F ("F" means "Fast")