Reverse discrimination mod please help!

[dejavuband]

Hi lads i have a redheat lightning and was wondering how reverse discrimination works, as the person who made my machine put this feature on a few of his machines,how does it work and would i be able to add it to my machine,its normally a flick switch that throws in the reverse discrim so would i have to connect it to the disrim pot is this right,ive done mods before on tesoros,ground balance and all metal on cibola so i aint a stranger to the old solder iron,i just need the brains of one of you to put me in the right direction,cheers

[Don Jose de La Mancha]

Good evening DEJA: If I remember correctly, reverse discrinimation was simply placing your coil as close to the detected object as possible, retuning, then lifting your coil away and noting if the sound increased of decreased. It was primarily for "hot rock" discrimination.

Don Jose de La Mancha
"I exist to Live, not live to exist".

[Qiaozhi]

Hi lads i have a redheat lightning and was wondering how reverse discrimination works, as the person who made my machine put this feature on a few of his machines,how does it work and would i be able to add it to my machine,its normally a flick switch that throws in the reverse discrim so would i have to connect it to the disrim pot is this right,ive done mods before on tesoros,ground balance and all metal on cibola so i aint a stranger to the old solder iron,i just need the brains of one of you to put me in the right direction,cheers

"Reverse discrimination" requires you to search in all-metal mode. Usually you are searching for deep targets if you plan to use this technique (i.e. with discrimination switched off). When you find a faint signal, pinpoint it and place the coil over its center. Switch on discrimination and move the coil slightly to one side. The audio signal will increase for good targets and decrease for bad. The exact behavior may vary depending the brand of detector, and it really only works properly in T/R non-motion mode.

[dejavuband]

"Reverse discrimination" requires you to search in all-metal mode. Usually you are searching for deep targets if you plan to use this technique (i.e. with discrimination switched off). When you find a faint signal, pinpoint it and place the coil over its center. Switch on discrimination and move the coil slightly to one side. The audio signal will increase for good targets and decrease for bad. The exact behavior may vary depending the brand of detector, and it really only works properly in T/R non-motion mode.

This is a quote from person who owns the tornado machine with the reverse discrim,these machines are not TR non motion.I was using some Nugget Buster headphones and the audio was very well modulated, not like some recent releases whose audio is over-saturated. The reverse discrimination switch appeared to do it's job quite well with operation as follows. If a target is detected and you believe it might be iron falsing, then you pull the spring-loaded toggle switch. If the target goes silent then you dig, if the target remains solid then it is iron. If the target is iffy then it is a judgement call depending on how scratchy it is in reverse Disc.

[Qiaozhi]

This is a quote from person who owns the tornado machine with the reverse discrim,these machines are not TR non motion.I was using some Nugget Buster headphones and the audio was very well modulated, not like some recent releases whose audio is over-saturated. The reverse discrimination switch appeared to do it's job quite well with operation as follows. If a target is detected and you believe it might be iron falsing, then you pull the spring-loaded toggle switch. If the target goes silent then you dig, if the target remains solid then it is iron. If the target is iffy then it is a judgement call depending on how scratchy it is in reverse Disc.

As you can see from the quote "reverse discrimination" can be performed in various ways, but the overall concept is the same. Hunt in all-metal mode, then switch on discrimination to identify the target. This relies on the fact that the amplitude of the RX signal changes direction depending on whether the target is ferrous or non-ferrous, and which direction depends on the way the coil is balanced.