I mentioned that my "V" is out being modified with a ten turn ground balance potentiometer replacing the original five turn ..If I had a bigger pot put in, say, twice the value in ohms..Does the possibility exist that we could ground balance even in a wet salt environment?? If ground balance is a null point, could it be metered? ...A meter, negative on one side, positive on the other..And, ground balance could be kept dead on, or adjusted to suit your style of hunting..Worked very well on a !966 Fisher T20 style circuit, don't know if the "V" circuit could be adapted..Would like to apologize, have all these crazy ideas, but know nothing about electronics .If I even pick up a soldering iron, the local power company goes on alert..So ,I have to depend on you all ,to keep me out of trouble..,Slowly, but surely, I will reinvent the TD paper money finder.... cordially NAD
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Sorry, another Question about Ground Balance
- Thread starter nad
- Start date
Mike Hillis
Well-known member
Hi Nad,
Ground has two ends; one being magnetic and the other being conductive. There is a whole lot of room inside. What are you wanting the meter to measure? There are detectors produced today that can tell you the conductive or magnetic property of the ground. This is usually reported as a "phase number". Models off the top of my head that can tell you the phase number (how conductive or magnetic the ground is) include the DFX, F75, T2, and F5. I'm sure there are others those are just the ones I have personal experience with.
Its not just the ground phase you need to be concerned about but also the strength of the mineralization. The phase number of the ground doesn't indicate how strong the minerals or conductive properties of the ground are, only the degree to which they are conductive or mineralized. You need a different gage for that. The F75, T2, and F5 tell you both the ground phase and the strength of the mineralization.
When you balance your detector to the ground, you are balancing to the ground's conductive or magnetic properties or phase number. To balance to the strength of the ground is a different activity. To balance to the strength of the ground is done with your sensitivity or gain control, coil height above the ground and by coil control. The only way you can monitor both the ground phase and it's strength while hunting is in a threshold based no-motion all metal mode of operation. The minute you switch over to a discriminating mode you have lost that monitoring ability. The meters/gage of the F5, F75 and T2 make it easier to notice when things change when in a disc mode but they don't really replace that full time audio monitoring you get in the threshold based all metal mode.
Regardless of your ground phase number, If your ground strength is low, no big deal. Tune to the ground phase, tune to the electrical conditions of the site, put the coil flat on the ground and go. However if your ground strength is moderate to high to extreme it now becomes a very big deal.
When the ground strength passes that low to moderate level and goes toward moderate high to high to extreme the user has to tune to the ground phase, tune to the electrical conditions, find the proper sens level, find the proper coil height and then practice coil control to keep it there. You only learn this from learning from others, past experience, or a combination of the two. Add a quick changing ground phase, and/or a quick changing ground strength and the picture gets a bit more color in it.
Find your ground settings in the threshold based all metal mode and set up your machine there and then move into your disc mode, if your ground warrants that much activity. Some of the guys posting on Findmall have air for dirt insofar as ground minerals go and it's hard to screw up badly enough to notice. For those with the harder stuff, you'll find this useful.
Good luck,
Mike
Ground has two ends; one being magnetic and the other being conductive. There is a whole lot of room inside. What are you wanting the meter to measure? There are detectors produced today that can tell you the conductive or magnetic property of the ground. This is usually reported as a "phase number". Models off the top of my head that can tell you the phase number (how conductive or magnetic the ground is) include the DFX, F75, T2, and F5. I'm sure there are others those are just the ones I have personal experience with.
Its not just the ground phase you need to be concerned about but also the strength of the mineralization. The phase number of the ground doesn't indicate how strong the minerals or conductive properties of the ground are, only the degree to which they are conductive or mineralized. You need a different gage for that. The F75, T2, and F5 tell you both the ground phase and the strength of the mineralization.
When you balance your detector to the ground, you are balancing to the ground's conductive or magnetic properties or phase number. To balance to the strength of the ground is a different activity. To balance to the strength of the ground is done with your sensitivity or gain control, coil height above the ground and by coil control. The only way you can monitor both the ground phase and it's strength while hunting is in a threshold based no-motion all metal mode of operation. The minute you switch over to a discriminating mode you have lost that monitoring ability. The meters/gage of the F5, F75 and T2 make it easier to notice when things change when in a disc mode but they don't really replace that full time audio monitoring you get in the threshold based all metal mode.
Regardless of your ground phase number, If your ground strength is low, no big deal. Tune to the ground phase, tune to the electrical conditions of the site, put the coil flat on the ground and go. However if your ground strength is moderate to high to extreme it now becomes a very big deal.
When the ground strength passes that low to moderate level and goes toward moderate high to high to extreme the user has to tune to the ground phase, tune to the electrical conditions, find the proper sens level, find the proper coil height and then practice coil control to keep it there. You only learn this from learning from others, past experience, or a combination of the two. Add a quick changing ground phase, and/or a quick changing ground strength and the picture gets a bit more color in it.
Find your ground settings in the threshold based all metal mode and set up your machine there and then move into your disc mode, if your ground warrants that much activity. Some of the guys posting on Findmall have air for dirt insofar as ground minerals go and it's hard to screw up badly enough to notice. For those with the harder stuff, you'll find this useful.
Good luck,
Mike
Mike Hillis
Well-known member
Jabbo, you are right. DD coils can help a lot since the coil's footprint see's a smaller volumn of soil at any one time. That in itself equates to deeper signals in the stronger ground since there is less ground signal to overcome. I need to say something about "rate of change" and DD coils but I'm out of time.
HH
Mike
HH
Mike