Question about filters 1 & 2 in GoldQuest SS V2

[kt315]

you mean Goldquest Aquasearch, pcb ID PPD4, it is different than GQ SS.

[GeoMax]

Here is some additional information and pictures about the GQ SS V2 Filter 1 & 2 that I found on the Internet.

SAT Control
Set the SAT control, (Self Adjusting Threshold), to medium speed. A slight tremble on the audio note is normal and is due to residual IF pick-up on the search loop. This control is adjusted to maintain the re-set speed of the Threshold. Clockwise settings slow the SAT down, allowing for a longer time for target annalist, and circuit re-set. These slower settings will also allow a slower sweep speed of the coil. Conversely, turning it clockwise will speed the SAT up. This may be needed in areas of noise, or interference from ground affects. It is best to sweep faster at these higher SAT settings. Given the choice, go for the lower SAT.

Filter 1 & 2
Filter Switch: Is a control that will allow the user the option of using a stronger ground filter if needed, due to bad, noisy ground, such as found in nugget hunting areas. The Filter switch is tied in directly with the S.A.T. circuit control. Position #1 would be the place to put the switch for most detecting. Position #2 would be used in heavy iron laden soil, to help smooth out the unit.

Detector Images

[Detectorist#1]

Maybe the name "Filter 1&2" of the switch is not exact. Maybe the thinks are more simple and this switch just enable or disable the control of gate of J113 by feedback in SAT stage (like in CS6PI schematic). Enabling of this control make fast SAT - disabling (grounding of the gate) -make slow SAT.

[GeoMax]

Hello Detectorist #1,

You may be right that it's not a real filter stage, but something very simple. I thought it might just be a matter of changing the SAT resistor value via the filter switch. Eric was a fan of simple solutions, and changing the SAT resistor value via a switch is one of the easiest options. I'm sure he used the same (old) boards (PPD4 Issue 2) for the GoldQuest SS V2 as for the GoldQuest SS and just modified them. He only made a new PCB for the latest GoldQuest Version 3. I've seen that before, too.

Maybe someone has other information or a detector with a Filter 1 & 2 circuit and can take a look.