Coils for modified GPX

[filternozzle17]

I have a selection of coils built up over the last six years.   Most are DD or Anti Interference,  as I hunt in the UK for small hammered silver coins I often need to be able to discriminate iron.  I also have a small selection of monos'.
My questions are:

Will a fully modified GPX using either Coiltek/Minelab DDs or Coiltek AI coils give extra noticeable performance?   I guess the Coiltek/Minelabe mono coils will benefit but I am not sure about the DD & AI.

My biggest problem is not ground noise but EMI from suburbia/power lines/mobile phone transmitters etc. Sometimes, I cannot get a completely smooth threshold.  Will a full modification enable smooth threshold most times?

Is there an optimum coil size for a modified GPX?   I use both the 4500 & 5000.

[filternozzle17]

I have a selection of coils built up over the last six years.   Most are DD or Anti Interference,  as I hunt in the UK for small hammered silver coins I often need to be able to discriminate iron.  I also have a small selection of monos'.
My questions are:

Will a fully modified GPX using either Coiltek/Minelab DDs or Coiltek AI coils give extra noticeable performance?   I guess the Coiltek/Minelabe mono coils will benefit but I am not sure about the DD & AI.

My biggest problem is not ground noise but EMI from suburbia/power lines/mobile phone transmitters etc. Sometimes, I cannot get a completely smooth threshold.  Will a full modification enable smooth threshold most times?

Is there an optimum coil size for a modified GPX?   I use both the 4500 & 5000.

Any answers for this one Woody?   

[filternozzle17]

I have a selection of coils built up over the last six years.   Most are DD or Anti Interference,  as I hunt in the UK for small hammered silver coins I often need to be able to discriminate iron.  I also have a small selection of monos'.
My questions are:

Will a fully modified GPX using either Coiltek/Minelab DDs or Coiltek AI coils give extra noticeable performance?   I guess the Coiltek/Minelabe mono coils will benefit but I am not sure about the DD & AI.

My biggest problem is not ground noise but EMI from suburbia/power lines/mobile phone transmitters etc. Sometimes, I cannot get a completely smooth threshold.  Will a full modification enable smooth threshold most times?

Is there an optimum coil size for a modified GPX?   I use both the 4500 & 5000.

Hello Woody, appreciate your opinion, thanks.

[debongos]

Hi filternozzle17,

Check the available products on the DetectorMods web page. There is an interference filter that may help.

Peter

[filternozzle17]

Hi filternozzle17,

Check the available products on the DetectorMods web page. There is an interference filter that may help.

Peter

Thanks Peter.    Just checking if the interference filter is also part of a full modification?

Richard

[filternozzle17]

Hi filternozzle17,

Check the available products on the DetectorMods web page. There is an interference filter that may help.

Peter

Thanks Peter.    Just checking if the interference filter is also part of a full modification?

I see the filter is out of stock at the moment.   What is the modification that is required to the stock battery Peter?
Richard