I’m certainly not saying that it flat out CANNOT BE DONE,but an operators ears would have to be absolutely UBER TUNED to pick out the variances of a CONSISTENTLY REPEATING COIN vs a CONSISTENTLY REPEATING “something else” that is close,but the tone is slightly too high. Of course,the very highest of tones that coincide with 30 or 31 on the Conductive reading are not usually good targets, but they can blip up to 30 if the target is deep and it can’t get a good bead on it. At least,that’s what IVE found.
Everyone has an opinion on this,but I’ll give you exactly what I use in many places. These places have varying degrees of Conductive trash AND nails,so I had to come up with something that would give me a chance at coins up to 8-9” in the cleaner areas on a pretty regular basis and NOT have me digging trash all day because everything,with settings which are too “hot”,can sound like an “iffy signal”!
AUDIO...VOLUME....Max limits where it needs to be for you be able to hear it clearly. GAIN at 10 if in Semi-Auto,7 or 8 if using Manual.
AUDiO...TONES....Threshold tone 5. VARIABILITY at 10. LIMITS at 10
AUDIO...SOUNDS....FERROUS
OPTIONS...RESPONSE...NORMAL
OPTIONS....RECOVER....FAST and DEEP both OFF
Hunt using the Smart Screen. To begin with,dig anything that shows up in the upper right quadrant of the screen. If you want to dig COINS...don’t waiver on this for now,stick to the rule!
Set the SENSITIVITY to either Semi-Auto 26 or Manual 18-22. This will be completely EMI dependent. DO NOT allow the machine to sit motionless with the coil on the ground not moving and STILL have erratic operation(blipping,cursor jumping around the screen). If it does this even with Semi-Auto chosen,you’ll have to go to Manual Sensitivty and run it lower than 18,but don’t if you don’t HAVE to. Performance starts to fall off quickly below 18.
When I do run wide open(most always) I’ll clear the screen in Discrimination and hunt with that. Then I’ll have the Iron Mask screen set to -6 and if I want to check something,I’ll go to that.
My own personal success has come from having a STABLE MACHINE. Take the time to modify your settings with the above and just give it 10 hours. Going above Manual 22 in almost ALL of my sites,no matter if in the city or country,is detrimental. Most of my work can be done in Semi-Auto 26. Just give it an honest chance. It sounds like although you’ve had the machine for a certain amount of time,you are not the highest level expert. Neither am I,so I don’t try to be. The machine will find it. YOU have to know what it’s telling you,and with the above changes I believe you will do very well...AS LONG AS THE COINS ARE THERE TO BEGIN WITH!
For someone who is having trouble finding coins,this is a starting point. Good luck Ted!