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Pushed the 505 to find drain field collector box
Posted by: salmonriverhotrock
Date: November 15, 2015 09:20PM
:usmc:

The septic tank drain field sewer system here is old and finally is in need of replacing the old pipe and drain field. Without any real drawings to go by, it was dig out the 505 time. I was not around when they backhoe dug from a known septic tank out to where the non metallic pipe joined a larger one but we knew from there to however far had to be a collector box where the drain field begins. I fired up the 505, placed it in the all metal mode with no discrimination, full sensitivity, raised the standard concentric coil above the ground about 5 feet and ground balanced it, then slowly lowered it back down to about 2 or so feet until just breaking the audio threshold with headphones on.

After swinging for a ways, I noticed a location about in line with the exposed run that was giving me a slight increase of activity. It seemed to be repeatable no matter what direction I worked into it. I began to make marks with my shoe in the dirt and gravel and it began to form up a visual area about 4 foot by about 8 foot long. When I detected down it's length, the sound swinging in would slightly increase and then around the middle would have a little more increase with some lite crackling and then passing to the other side would go back to that slight increase like the other side and then it would drop. My coil swings were not fast at all. I made sure I could repeat this about 3 times and then told the guys dig here, Sure enough as I suspected, an old iron pipe maybe 6 inch diameter by about 8 foot long running into a concrete collector box for the start of the drain field.

I've used this same technique finding highway culverts though bigger and deeper. This pipe was 3 foot deep plus I ran about 2 foot give or take above ground. Ground balancing at ground level or 2 inches above was useless in trying to hear it. Not until I eliminated physical earth or the ground from the coil could I repeatedly hear the target.

This may not be digging for coins and rings but it could be useful in searches for buried caches or can be used if your ground is a bit too hot or trashed out for coin hunting. I have had some successes with this in trashed areas that I did not have my 4" coil with me. Just keep in mind swinging low to the ground is not your only option and I really doubt there are many who have played with getting earth away from their concentric coils.



Robert of Idaho
Veteran U.S. Marine Corporal

Fisher F2 w/ 4" & 8" , and 11" DD Bi-Axial 5.9 kHz coils
BH Pioneer 505 w/ 4"& 8" 6.8 kHz coils
Garrett Freedom II Coin Commander w/ 7-1/2" Deepseeker 5.5 kHz coil
Falcon MD-20 Gold Tracker 300 kHz 1" coil
White's GoldMaster V/SAT w/ 6" X 10" Long Scan, 6" X 10" Twin DD, & GM Shooter 4" X 6" DD 48-50 kHz coils
White's GMT w/ 6" X 10" Twin DD 48 kHz coil
Keene A52 Sluice Box
Keene Classifiers
Garrett Gold Pan/Classifier kit
Blue Bowl concentrator
Two very old iron Mortar & Pestles

Re: Pushed the 505 to find drain field collector box
Posted by: Digginghound
Date: November 27, 2015 03:35AM
Quote
salmonriverhotrock
:usmc:

The septic tank drain field sewer system here is old and finally is in need of replacing the old pipe and drain field. Without any real drawings to go by, it was dig out the 505 time. I was not around when they backhoe dug from a known septic tank out to where the non metallic pipe joined a larger one but we knew from there to however far had to be a collector box where the drain field begins. I fired up the 505, placed it in the all metal mode with no discrimination, full sensitivity, raised the standard concentric coil above the ground about 5 feet and ground balanced it, then slowly lowered it back down to about 2 or so feet until just breaking the audio threshold with headphones on.

After swinging for a ways, I noticed a location about in line with the exposed run that was giving me a slight increase of activity. It seemed to be repeatable no matter what direction I worked into it. I began to make marks with my shoe in the dirt and gravel and it began to form up a visual area about 4 foot by about 8 foot long. When I detected down it's length, the sound swinging in would slightly increase and then around the middle would have a little more increase with some lite crackling and then passing to the other side would go back to that slight increase like the other side and then it would drop. My coil swings were not fast at all. I made sure I could repeat this about 3 times and then told the guys dig here, Sure enough as I suspected, an old iron pipe maybe 6 inch diameter by about 8 foot long running into a concrete collector box for the start of the drain field.

I've used this same technique finding highway culverts though bigger and deeper. This pipe was 3 foot deep plus I ran about 2 foot give or take above ground. Ground balancing at ground level or 2 inches above was useless in trying to hear it. Not until I eliminated physical earth or the ground from the coil could I repeatedly hear the target.

This may not be digging for coins and rings but it could be useful in searches for buried caches or can be used if your ground is a bit too hot or trashed out for coin hunting. I have had some successes with this in trashed areas that I did not have my 4" coil with me. Just keep in mind swinging low to the ground is not your only option and I really doubt there are many who have played with getting earth away from their concentric coils.

I have a BH 505 as a back up for my AT Pro.
I'm not certain that you can truly GB the BH 505.
I know it has an all metal no motion mode.
How are you ground balancing the 505 ?
I am by know means an expert on the BH 505 and if it truly has ground balancing capabilities I would love to know how to do it for future reference . Thanks for your help.



Edited 1 time(s). Last edit at 11/27/2015 03:38AM by Digginghound.

Ground Track only works in AM mode.N/T
Posted by: Hightone
Date: November 27, 2015 02:29PM

(This message does not contain any text.)



Coin and Jewelry hunter.
BH Land Ranger Pro
BH Quick Draw Pro
Deteknix XPointer
Have owned different Garretts,
Fishers, Tesoros, Whites and MineLab
in the past 12 years.

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Re: Pushed the 505 to find drain field collector box
Posted by: salmonriverhotrock
Date: November 28, 2015 09:34PM
:usmc:

Hightone is correct, the Ground Track as I maybe should have called it only operates in the ALL METAL mode. It is the manual Ground Balance for the 505 but is adjusted electronically by the machine, not the operator when activated. This can have some advantages and disadvantages but there are some people who desire having the ability to enter their own flavor of ground balance than to have a machine decide it for them and others desire less knowledge required to operate a machine so want a machine that does it for them. I much prefer to set my own GB precisely as I want it on my gold machines and so I can on those but hunting Gold is entirely different than coins and rings and so when I bought my 505, I only needed it to have a manual ground balance though when selected, the machine adjusted it. Remember, ALL METAL is your most powerful detecting mode. Your 505 has all the other features to follow up behind it.



Robert of Idaho
Veteran U.S. Marine Corporal

Fisher F2 w/ 4" & 8" , and 11" DD Bi-Axial 5.9 kHz coils
BH Pioneer 505 w/ 4"& 8" 6.8 kHz coils
Garrett Freedom II Coin Commander w/ 7-1/2" Deepseeker 5.5 kHz coil
Falcon MD-20 Gold Tracker 300 kHz 1" coil
White's GoldMaster V/SAT w/ 6" X 10" Long Scan, 6" X 10" Twin DD, & GM Shooter 4" X 6" DD 48-50 kHz coils
White's GMT w/ 6" X 10" Twin DD 48 kHz coil
Keene A52 Sluice Box
Keene Classifiers
Garrett Gold Pan/Classifier kit
Blue Bowl concentrator
Two very old iron Mortar & Pestles

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