Coil specific question

[Canewrap]

I apologize if I'm rehashing a topic with this one, but I'm trying to figure out if I need to add an 18.75 hz 10.5" DD coil to my stable for relic hunting. I already have the MF 10.5 and it works ok in moderate to bad ground, but I hunt good ground too and I wonder if the higher freq. coil might not work better on deep bullets and small buttons in good ground. I noticed that a higher freq. detector picked up the head of a target arrow better than the 7.5 khz coil. I think that thin metal head is similiar to what a detector would see if over a CW button.

 

[Canewrap]

Wow, a hundred views and nobody with experience has an opinion? I'm thinking I need to pick up a larger HF coil (have the 6" HF), but I'm not sure if I should get the concentric version or the DD coil. Like I said in the earlier post, I will be hunting in good ground with this coil and need to be able to pick up lead at 8+ inches and small buttons at about the same depth. I have the 7.5 khz DD coil, but experience suggests that it won't pick up these targets as well at depth. Anyone with experience relic hunting in good ground?

 

[BarnacleBill]

n/t

 

[Shenandoah Digger]

I don't think you'll see much difference as far as lead goes, because it is more of a mid conductor. Some Civil War buttons are low conductors, and it would make a difference there. I use the 5x10 with good success in areas I've hunted with the 10.5 7.5 frequency.

 

[David]

The higher the frequency the more sensitive to lower conductive metals being iron and gold especially small
targets--small surface areas showing to the coil BUT a higher frequency has less depth than a lower frequency coil.

So it is confusing to me too? Will a higher frequency round 10.5" 18.75 kHz DD pick up the deep bullets and small buttons deeper than the lower medium frequency round 10.5" 7.5 kHz DD"??

You said, "I wonder if the higher freq. coil might not work better on deep bullets and small buttons in good ground."

BUT if bullets are made of lead and not iron "and" if the small buttons made of brass, these are higher conductive SO in my opinion the 10.5" 18.75 kHz (HF)DD will NOT help you go deeper on lead bullets and small brass buttons. But would have be more sensitivity to small gold and iron and would go deeper on these. This coil is better for small gold rings and jewelry on the beach(or anywhere) or for gold prospecting. For relic hunting for iron relics then this HF coil would be better.

For your application the lower the frequency the better for lead or brass relics. You would need a 10.5" 3 kHz (LF)DD to go deeper for these small brass buttons and bullets, which is not made yet.

The MXT and Tesoro Vaquero have higher frequencies. A (LF) 5 kHz Musketeer Advantage with a round CoilTek 15" DD WOT may go deeper for your application and get those deep bullets and button relics the X-Terra 70 misses with the round 10.5" 7.5 kHz DD . The BBS and FBS machines would go deep but they are very slow for ground coverage in very large relic fields and a single frequency VLF will cover about 3 (or more) times more ground.

 

[hogedog]

No expert here but... and yes everyone has an opinion but they all stink. 10.5 HF coil is an excellent coil. You may look for buttons and bullets and it will do fine with that. It's not just the soil type but what your looking for. I have not purchased the 10.5 coil yet but I do have the 6" for gold and just messing around. I used it today and found 2 buttons about 5" deep. They screamed! Good solid hits, I think they are made of brass but not sure as of yet. The only problem I found (and this wouldn't be a problem for you) is they hit on iron more than I would have thought. Please don't get me wrong, I'm not blaming the coil or the detector (I'm still learning). It just seemed to have a good tone for shallow and large iron. I was hunting in #3, sensitivity 22, threshold 7 (need good headphone), noise cancel 0. Good luck either way, I just don't think the coil will be a waste of money. As far as the responses go, it's cold and wintry in many places right now. Some may not check the site as much this time of year. Hmmmmmm, who knows, enjoy and MERRY CHRISTMAS TO ALL! I Politically correct, so be it.

JFK

 

[Digger]

I hunt in moderately mineralized soil. As such, I get more depth out of the concentric coils than I do the DD coils. David is correct, lower frequencies are better suited for higher conductive targets, such as heavy brass. And if you follow that train of thought, the lower frequencies are "less suited" for lower conductive targets, such as iron. That is why I use the 3 kHz coil when I hunt old homesteads and farmsites. In the All Metal, multiple tone mode, iron gives me a very distinctive (harmonic) audio response.
As my "rule of thumb", if the GB can be properly set with a numeric display of 28 or less, your soil conditions warrant the need of a DD coil. However, if you can GB your X-70 with a number greater than 28, your mineralization is low enough that the concentrics will operate well. And in these soils, I believe I get more depth with the concentrics. JMHO HH Randy

 

[Reconmarine1984]

I switched to 10.5 DD 7.5 Feq ovber an year back, and its my hands down deepest coil I use find relic hunting at over 10/12 inches deep in almost all soils., the bad soils you loss down to 8 inches, but still out perfrom most othere bradands. The 10.5 DD coli 7.5 is hands down best coil to find deep bullets and buttons and yes deep plates at over 3 feet!!

 

[Jackpine Savage]

In your good ground areas are you able to run the stock concentric coil wide open with sensitivity settings of 29-30? If so, I would certainly give it some hunting time. Note how it ID's the deeper targets (either upscale or down scale). IMO in true low mineral ground the stock coil is an excellent choice for depth, you just have to learn how it ID's the deeper stuff.

Tracking on... that's the ticket!!

Try out the beach ground balance mode also as it can sometimes add depth in low mineral ground.

Tom

 

[Canewrap]

I saw your pictures of the plate you found and it proves your point. I did ask if it was good ground you were hunting in and I guess you didn't see my question. I have the MF 10.5", but I haven't tried it much. Guess I'll put it on for a while and leave it on to see how well it works. The next site I'm planning on hunting has been hammered for a long time and was the site of a big skirmish. It should be interesting to see if I can find anything with this setup.

 

[Canewrap]

Yep, I've been using the concentric on these sites, running wide open, except for areas where I have turn down the sensitivity because of things like electric fences (happened yesterday on a horse farm). Thing is, I wasn't finding any deep targets, nothing really deeper than 6". I really need to go ahead and do the mod I've been planning and add 6 oz under the arm rest, then mount the 10.5" MF coil. Doing tests with this coil it appears to pick up a penny at 10" in moderate ground. It should do well in the less mineralized ground up in Tennessee.

 

[David]

Jackpine Savage wrote:
"Tracking on... that's the ticket!!

Try out the beach ground balance mode also as it can sometimes add depth in low mineral ground.

Tom"


These are new to me Tom? I do love Tracking have gold prospected for years but how does that give more depth or how is that the ticket, I am curious?

I wonder how beach ground balance could sometimes add depth?

Thanks!

(I also wonder why on Findmall everytime we Edit a post it shows at the bottom how many times we Edited it? I think this is a bad idea and should be changed as why do we have to advertise how many time we have Edited a post? On other forums I was on there is no such notice.)

 

[Jackpine Savage]

Jackpine Savage wrote:
"Tracking on... that's the ticket!!

Try out the beach ground balance mode also as it can sometimes add depth in low mineral ground.

Tom"


These are new to me Tom? I do love Tracking have gold prospected for years but how does that give more depth or how is that the ticket, I am curious?

Here's my thoughts on tracking in low mineral ground:
If in true neutral ground the more important aspect to performance then becomes the grounds conductivity level which can vary just like mineralization levels vary in nasty ground. The size of the soil particles, moisture levels, soil compaction and the absense or presense of silts and clays all enter into determining the net conductivity level. Thats why I recommend tracking on even in neutral ground.

I wonder how beach ground balance could sometimes add depth?

Beach ground balance not only updates faster but it also appears to remap the threshold and gain levels at a given sensitivity setting which may, or may not add some depth in certain situations.


Thanks!

These are just my thoughts based on my experience during use of the X70 trying out various settings.

Tom

 

[ngrelic]

I am using the 10.5 MF DD on my x50 for relic hunting in NW Ga. with great success. The more I learn to listen to what the detector is saying, the deeper my finds are getting. I am digging minie balls at 10"+ and have found a couple at 12"+. This is in moderately mineralized ground.

 

[Canewrap]

Thanks ng, I'm now convinced of the value of the MF 10.5". You hunt ground similiar to mine.

 

[ngrelic]

I hunt in All Metal mode and if the machine even tries to give a good tone I will investigate it further or go ahead and dig. On some of the deeper bullets I will get a low iron like tone at first and then it will jump to a higher tone, sometimes broken. Like I said, the more I learn to listen to it, the deeper, and more numerous, the finds become. I set a goal the other day to find at least 10 bullets, even if I had to hunt all day. In 3 hours I found 11 minies, 3 musket balls, a carved bullet, 2 buck shot, and a peice of a fuse. I was worn out from digging.