Damn thos screw caps! They have been my bane since getting my Safari. I have been working on learning the sounds of the FE mode and for me they are a little easier to distinguish than the Conductivity mode. Of course all of this was with air testing since it has either rained or snowed all week! I gathered up a variety of targets and placed them in groups according the the pitch of the sound I hear for each group. I was able to distinguish 4 different, distinct sounds and each of the test targets were sorted accordingly. I have a low frequency hearing loss and if I can make out 4 different sounds, anyone can with some work.These are the sounds the best I can describe them and what targets I was able to fit in each tone. Yours may be different because of the difference in hearing ability.
1. "Tweet" , very high pitched repeatable signal: Quarters ( clad and silver), 1972 Kennedy half dollar, 1923 silver dollar, silver rings, coin size silver objects. Showing silver on the linear scale, 36 to 38 on the conductivity scale.
2. "Twitter" , not quite as high pitched as #1 and with a slight warble or twitter sound: Clad and silver dimes, wheat cents, copper pennies. Showing in the far left side of the silver scale, 38 on the conductivity scale.
3. "Whistle" medium high pitch, sounds like someone blowing a whistle to me: Can slaw, aluminum pulltabs, nickels, lead with high tin content disc. In the Gold and aluminum range showing a 14 on the conductivity scale.
4. "Toot" Much lower sounding pitch than any of the others: Brass shell casings, jacketed rifle bullets, 14k gold ring mans ring. Showing 22 on the conductivity scale, gold/aluminum range.**Noted exception is the zinc penny that had the same sound but showed a 34 on the conductivity scale and copper range on the other. This one kinda' puzzled me so I ran it several times and still got the same sound, just different readings.
Don't know how helpful this may be to you who are having problems. Now I need to take this scale out into the field and see how accurate the air tests are. And as a final note, the detector was set on the coin scale but cross programed to the FE mode, auto sensitivity and noise cancelled after making the change to the program. The 6" DD coil was installed. I could pick up clear repeatable air signals at 7+ inches depending on the size of the target. Monty