705 falsing question

[tbrom]

The digger is a hot coil. TID tend to be higher. I can run mine around 22-23 most places but I have been running it around 20 with success as of late. I seem to get more depth turning down the sens.

 

[Venner]

I've been using the Digger coil almost exclusively since I got my 705. How sensitive I can run it depends entirely on the soil I am over. Being in a glaciated area (kerns, eskers, kettle lakes and so forth), there is high variability from site to site in terms of mineral deposits. Some places, the auto ground balance reports a single-digit value, other places it is in the low to mid 20s.

I find myself pushing the limits of the coil; I take the sensitivity as high as it will go and then knock it down one step so it makes no false noise. This typically means 24-27 in "normal" soil here, but I've occasionally had to drop it to the low-teens. I found one site I *could* run it balls-out at 30 sensitivity with no falsing, but that was a fluke -- and that high of a sensitivity has real disadvantages too. The moisture content of the soil (dry vs. after a rain) will definitely contribute to a different GB value.

I have found that running it that hot absolutely gives the best depth, but it will often give crazy readings, especially over iron or foil trash targets. (E.g., it will hit at -8 on one pass, 46 on the next, then move from 28, 38, etc, in the middle. This along with a "junky" sliding audio sound.) When that happens, I just bump it down 5-10 sensitivity while hunting that particular target and it gives a more accurate reading. (And always check the spot from multiple directions, of course.)

The same behavior that the OP described also seems to happen if the sensitivity is too high for the local conditions.

 

[tbrom]

The original problem with the falsing was a fractured board. No setting where going to change that.

 

[Digdoggy]

Yeah, that's one for ML. Mine only makes a little soft and short false sound when I run the digger coil around 25 an bump into stuble or roots and its not bothersome. I never need to go above 22 anyway. My soil will read 9, 11 and the highest around where I live was a 21. Once read 30 about 2-3 towns away at a park. No way should yours be unstable at sens of 15 to 20.

 

[Johnp3]

Yeah, that's one for ML. Mine only makes a little soft and short false sound when I run the digger coil around 25 an bump into stuble or roots and its not bothersome. I never need to go above 22 anyway. My soil will read 9, 11 and the highest around where I live was a 21. Once read 30 about 2-3 towns away at a park. No way should yours be unstable at sens of 15 to 20.

Thanks DD for the info (pun intended). Venner's experience helps me, too - knowing what's "normal" helps keep the shorts un-knotted. I went back to my previous post about Coins On Edge, as well as OLH's Digger review, and re-read what you guys said about sens, slower sweep speed, etc. That really helped me. To test it in the yard last night, I lowered the sens to 19 (number chosen using the SWAG method...) and slowed down my sweep speed. I don't sweep very fast in the base-case, but I think my base sweep speed was still juuuust a little too fast for this coil. The coil is definitely better - much better. There's a deep little iron target at about 4-5 arrows deep in my yard that I used to compare the HF DD Elliptical and the Digger, and the first pass was anticlimactic. The HF DD hit it OK, though intermittently and only from one direction, however the Digger just quietly grunted infrequently even with the lower sens. Then, after slowing my sweep speed way down, the target came in much much clearer and was repeatable on the Digger. "Well I'll be..." (sanitized version of I actually said).

This coil actually takes a little practice, patience, and know-how. You guys really know your stuff.