I can't take credit for all the info below as some of it was given to me by an avid F5 user, but I have added some of my own to it as well. It should help out any new user learn the F5 a little quicker especially when combined with what the manual offers. Hope this can help others out as much as it's helped me learn the F5 a little quicker and get you finding the good stuff.
I love my F5, there is a bit of a learning curve on the adjustment of the Gain and Threshold, Don't try to run them both wide open it will result in an erratic display and chatter it's the F5's way of telling you it's overloaded.
If your coin shooting try setting the unit in DIsc mode, d4 (4 tone mode), Gain on 80, Theshold on -9, and Max out your Discrimination. Only recover repeatable high tones. All you'll be hunting is silver and copper and clad dimes/quarters/ etc. Just get use to doing that for awhile. Your treasure to trash ratio will immediately improve. Then when you are comfortable with both the digging and high tone targets, notch in the Nickel range and hunt that way for awhile until you learn that range of targets. Then as you feel comfortable, add in another segment, like the zinc segment. It has has a different tone and you'll be looking at a completely new range of targets.
The deep grunt tones will be iron objects, usually heavily oxidized. Depending on where you have your discrimination set at, these will either repeat or, will hit once and then go quiet as the discriminator kicks in and silences them.
Think of Gain as a magnifier. The higher you raise it, the more it magnifies target signals, making them appear larger.
The Threshold is split into two features:
From settings of -9 to 0, think of the threshold control as a door. The door is shut at -9 and the door is fully open at 0.
From settings of +1 to +9, think of the threshold control as a volume control that makes all the signals that got into the wide open door louder and easier to hear.
That's kind of an over simplified description of the controls but pretty accurate nonetheless. The combination of the three features give the user a lot of control over the detector. Add the 4 different tone modes to it and the F5 has a lot going on with the audio.
When setting up the detector, think, "how big do I want the signal to be (GAIN) and, how large of a signal do I want coming through the door (THRESHOLD)" and if you have the door wide open (threshold at 0), then how loud do I want the tiniest signals (threshold above 0)
Then of course, the actual site conditions laugh at you and say, "sorry buddy, but you're going to have to make the signals smaller or close the door a little." And then the two of you work out the best compromise for the targets you are after.
Hope this helps your learning curve some, Happy detecting.
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