Whites Classic, II, III, ID, and IDX Modifications

[Qiaozhi]

Can anyone tell me what SAT means?
I am very interested in modification of classic 3 sl
My detector was made in 2002 in the UK.
Labeled on the inside battery compartment

Thanks, I'm Theo from the Netherlands.

SAT means Self-Adjusting Threshold.
This helps to keep the audio threshold constant so that the user doesn't have to keep changing it manually to correct for drift.

[wiellie]

SAT means Self-Adjusting Threshold.
This helps to keep the audio threshold constant so that the user doesn't have to keep changing it manually to correct for drift.

Thank you very much for your answer.
It is now clear to me.
Greetings Theo

[wiellie]

Missed one pic!!!
[ATTACH]24147[/ATTACH]

If I have understood correctly, is the mod with the micro switch for more depth in the boost mode?
(Norm sat Boost)

Sincerely Theo

Klik on missed pic for the pic

[wiellie]

So what exactly is the "boost circuit" Bill advertised? I understand the external GB and Threshold and all, but is the replacement of a couple resistor values the extent of the work needed along with the addition of a couple pots?

I have the same questions too!

And as the SAT mode means, Self-Adjusting Threshold.
And if the function is to keep the audio threshold constant so that the user doesn't have to keep changing it manually to correct for drift,
whats the use of the two positions microswitch?
This is a little bit confusing for me.

Can someone explain this please?

Thank you verry much,
Theo from the Netherlands

[Qiaozhi]

I have the same questions too!

And as the SAT mode means, Self-Adjusting Threshold.
And if the function is to keep the audio threshold constant so that the user doesn't have to keep changing it manually to correct for drift,
whats the use of the two positions microswitch?
This is a little bit confusing for me.

Can someone explain this please?

Thank you verry much,
Theo from the Netherlands

I suspect the 2-position switch changes the speed of the auto adjustment.

[wiellie]

I suspect the 2-position switch changes the speed of the auto adjustment.

I do not know, normally when the modification is done by Mr.Bill you have a switch with normal and boost. ( in de Netherlands call it Turbo switch)
I know if you use the boost mode, the batteries have only half life time, but more depth! therefore, the switch is also important. (You have a choice)
Therefore I do not see the benefit of the switch self adjusting treshold? Whether this should give more depth!
I hope someone can explain the boost circuit, and so that you can switch between them. (battery life)
If you look at the photo of Mr. Coin Chaser in this trade, you will see a switch with NORM SAT BOOST, could this perhaps be due to the depth?

Can someone help me with these questions?
I would like to fully understand it.

Best regards Theo from the Netherlands.

[Tial57]

Hello

These mods are they compatible with the Classic 3 SLX ?

Thanks

[Qiaozhi]

If you look at the photo of Mr. Coin Chaser in this trade, you will see a switch with NORM SAT BOOST, could this perhaps be due to the depth?

Are you certain that it's a 2-position switch?
Is that not 3-positions ... NORM, SAT and BOOST?
NORM could be the non-motion (manually adjusted threshold) setting.
SAT is the self-adjusting threshold.
BOOST is something else, such as increased TX power (which would explain the reduced battery life).

However, this does seem to be a strange combination of settings.

[wiellie]

Hello Qiaozhi.
Yes I am certain that it's a 2-position switch!
And yes I agree with you, it is a strange cobination of settings.
In the Neterlands they make only the ground balance and the turbo switch, and that costs 125 to 150 euros and that is a lot of money for this little modification.
See the link and then the last small picture! http://www.metaaldetectors.nl/testen/classic3.html
So I hope Mr. Bill look again at this trade and can tell us how we can make the boost mode switchable.
Because there is a boost that you can read in the last part of the instructions, since you have to make an adjustment for the IDX display dept meter.

Best regards Theo.

[Qiaozhi]

Here's a quote from Mr Bill ->
------------------------------------------------------------------------------------------------------------------
S.A.T changes. R32 220k resistor can be changed out. Raising the value slows the SAT. I have been installing a 375k running it through a toggle switch with the 220k. Giving a high & low setting of the SAT. One could use a potentiometer for variable results.
------------------------------------------------------------------------------------------------------------------
So it looks like my initial assessment was correct. The switch simply changes the SAT speed.

[wiellie]

Hello Qiaozhi,

Look wat i have found on the internet, we have both rigt.
The SAT is the boost mode, slower sat is more dept!
We are learning day to day.

Best regards Theo from the Netherlands.

With the adjustable S.A.T. control, one can set up the threshold re-set speed for the different hunting conditions encountered while detecting. With slower S.A.T. speeds, one can detect targets deeper than they can in the same instance with a fast S.A.T., because your giving the circuit more time to analyze the signal. The trade off is that the ground will also have an affect. Tougher ground generally requires a faster S.A.T.

[Davor]

IMHO the "ground effect" here is simply the 1/f noise that becomes more pronounced with slower motion compensation. My experiments with motion compensation say also that you have much smoother transitions, better recovery speed, and more meaningful pinpointing with slower motion compensation. As most of the detectors still are the refurbished old designs, many of these have a potential to go slower than their ancestors, simply because some of the op amps used now have less pronounced 1/f noise, and will not end in chatters and tears if slowed down a bit.

[Qiaozhi]

With the adjustable S.A.T. control, one can set up the threshold re-set speed for the different hunting conditions encountered while detecting. With slower S.A.T. speeds, one can detect targets deeper than they can in the same instance with a fast S.A.T., because your giving the circuit more time to analyze the signal. The trade off is that the ground will also have an affect. Tougher ground generally requires a faster S.A.T.

Yes, I'm certain that's the correct answer.
Unfortunately it doesn't explain your previous statement:

I know if you use the boost mode, the batteries have only half life time, but more depth! therefore, the switch is also important. (You have a choice).

Are you sure this is true?
Simply reducing the SAT speed should have no effect on battery usage.

[wiellie]

Yes, I've read on dutch forum, and also at the link I sent you with the turbo switch. http://www.metaaldetectors.nl/testen/classic3.html last litle picture, (translate de text.)
Perhaps the longer calculations, consumes more power, like a laptop that long calculate the battery faster empty. (play a game or so)

[wiellie]

IMHO the "ground effect" here is simply the 1/f noise that becomes more pronounced with slower motion compensation. My experiments with motion compensation say also that you have much smoother transitions, better recovery speed, and more meaningful pinpointing with slower motion compensation. As most of the detectors still are the refurbished old designs, many of these have a potential to go slower than their ancestors, simply because some of the op amps used now have less pronounced 1/f noise, and will not end in chatters and tears if slowed down a bit.

I think that it may work how you explain it.