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5 silver ~ 19 wheatie day! F-75 pillages turf.
- Thread starter ziphius
- Start date
There is still more silver and wheaties there. Such spots can never be hunted out. WTG! HH jim tnAh yes, some clarification! This is a cross-post from the California Kinzli forum, where a majority of the deep turf silver seekers use Minelab Explorers. So, it's kind of an inside joke between me and them about the F-75 being the "2nd best in the world." There has been a lot of discussion over on that forum about the merits of the F75. People are catching on! I exclusively use the F75 in turf hunting. - Jim
Cal_Cobra said:
Brian,
I'm running sensitivity at 85 on a scale of 0 to 99, using Delta Pitch tones. Sens = 70 gets the job done as well, but the real iffy ones aren't as loud. To me, threshold = volume and on the F75, I just vary the threshold, depending on my listening-to-junk-tolerance at a given site. Not sure if I answered the latter part of your question there. - Jim
ziphius said:
Hi Jim,
Yep that answers my question. I'm trying to equate the F75 settings into F70 settings (which appear to be identical, with the exception of some of the "modes", although the JE mode is the same as the slow mode on the F70, so their a lot more alike then not.
I hope Fisher fixes my F70, as I max out around 35 sensitivity before the machine gets erratic and unstable (any place I've hunted). If I can run with your settings, I think it would detect the deepies.
What do you hear on the F75 when you get a 10" deep coin? Is the TID accurate ?
Thanks,
Brian
Brian,
So far, my deepest coin is a 9 inch silver quarter. But I've dug other similar-sized things 2 inches deeper in the turf. The main audible difference between shallow and deep coins on the F75 is that shallow to mid-depth coins sound machine-like. Think of a doorbell: ding-dong! Or ding-ding! Deep coins have a more natural, squeaky sound, like a tiny songbird, or someone squeezing the life out of a mouse. Sorry for that analogy, I've never squeezed the life out of a mouse, I just imagine it would sound the same. - Jim
So far, my deepest coin is a 9 inch silver quarter. But I've dug other similar-sized things 2 inches deeper in the turf. The main audible difference between shallow and deep coins on the F75 is that shallow to mid-depth coins sound machine-like. Think of a doorbell: ding-dong! Or ding-ding! Deep coins have a more natural, squeaky sound, like a tiny songbird, or someone squeezing the life out of a mouse. Sorry for that analogy, I've never squeezed the life out of a mouse, I just imagine it would sound the same. - Jim
Cal_Cobra said:
Brian, I forgot to answer the TID part of your question. On a typical deep wheat cent or silver dime, the TID will bounce around, but the tone will be high and squeaky throughout. TID might bounce 10 or more levels (ie 65 to 75 for a wheat). I've dug wheats that were on edge or very deep that ID'd as mid-conductors (high 50s), but the tone told me to keep digging. I've also dug extremely oxidized wheats that rang up in the high 80s to low 90s, more like a piece of iron. If I'm in a turf environment and it's deep, I'm digging it regardless of the TID. But it is the high tones that make me pause most. Probably passing up an occasional deep gold ring as a result.
Wow, was it a real deep nickel, or was there some other piece of trash near the nickel? I've dug about a dozen war nickels with my F 75 and with but a couple of exceptions, all id'ed 30-31. The couple of exceptions did read higher, but sounded good, but near the nickels in the clod was a pieces of can slaw in one and a small screw nut in the other. Just curious. HH jim tn
jim tn said:
Interesting Jim. I've dug about 7 war nickels between 7 and 8 inches deep, and they've all shown some consistent readings at least in the low 60s, occasionally to the high 50s. I figured the silver content of them is what was driving the high tones. Shallow clad nickels definitely ID at 30-31 on my machine. I recently dug a deep (7-8 inches) 1947 nickel that read in the 40s. I've also dug a clipped section of a war nickel at depth. It was about 1/8th of the entire coin, just the section with the large "S" mintmark above the building. This too read in the 60s. All this was while using Delta Pitch tones, but since the ID readout is a separate process from the tone process, that shouldn't matter.
Jim
gmanlight said:
War nickels should read considerably higher than non-war nickels, because the war nickels have a 35% silver, 56% copper, 9% manganese content:
http://coinfacts.com/nickels/jefferson_nickels/1942p_jefferson_nickel.htm
Non- war nickels, on the other hand, are 75% copper and 25% nickel, so I would expect them to read much lower. Depth of the coin sometimes a fairly significant effect on the visual ID with the F75, so I mainly listen to the tones and peek at the depth gauge in making my decision on what to dig.
Ziphius:
Not sure what you meant by; "I.D. readout is a separate process from the tone process", but according to the manual on Page 22 in the 2nd paragraph (dP) Delta Pitch "This setting produces a tone whose pitch varies in relation to the visual I.D. number". By using dP you are losing the ability for the audio and visual systems to process the target individually, thus losing the ability to look for a cross reference on the target. Page 22, bottom paragraph (What you see vs. What you hear.) has the story.
Ron
Not sure what you meant by; "I.D. readout is a separate process from the tone process", but according to the manual on Page 22 in the 2nd paragraph (dP) Delta Pitch "This setting produces a tone whose pitch varies in relation to the visual I.D. number". By using dP you are losing the ability for the audio and visual systems to process the target individually, thus losing the ability to look for a cross reference on the target. Page 22, bottom paragraph (What you see vs. What you hear.) has the story.
Ron
Jim, I just threw 5 war nickels on the ground and also air tested them (outside) and the readings were a lock on 30-31. One even read 29. I'm not sure, however, that I have dug any much deeper then 5 or so inches. Throw a couple on the ground and see what they read. HH jim tn