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  #681  
Old 09-10-2017, 05:42 PM
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Nice finds Shari!!!
Today here in the USA, DEEP in the woods I found a Swedish "5 ORE" coin from 1884. We mostly find US coins here. A Swedish coin was odd in the woods here.
It is a Bronze coin...

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  #682  
Old 09-14-2017, 12:45 PM
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Another questions. Can you explain me in simple words - what changes when I change the target ID depth? Only depth level that device display or really depth?

And what do you think about DI 2 and DI 4 search modes? I never used it before, but will try.

Gain. What level do you use? I use 80-85, but MD to noisy sometimes.

Sorry for broken English
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  #683  
Old 09-14-2017, 06:10 PM
tnsharpshooter tnsharpshooter is offline
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Originally Posted by Shari View post
Another questions. Can you explain me in simple words - what changes when I change the target ID depth? Only depth level that device display or really depth?

And what do you think about DI 2 and DI 4 search modes? I never used it before, but will try.

Gain. What level do you use? I use 80-85, but MD to noisy sometimes.

Sorry for broken English
Your first question,,it affects target ID reliability.

DI2 and DI4 both good modes for depth, and higher gain with these can make them noisy depending on area. Especially gain levels 95 plus.

In a heavy emi environment,,a good approach some times is use DI3 and Max the gain to 99... Impact will generally run pretty quiet here even in some bad emi.

Don't forget to try freq offset when your detector gets noisy.
The freq offset on Impact works well.

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  #684  
Old 09-14-2017, 06:27 PM
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Originally Posted by tnsharpshooter View post
Your first question,,it affects target ID reliability.

DI2 and DI4 both good modes for depth, and higher gain with these can make them noisy depending on area. Especially gain levels 95 plus.

In a heavy emi environment,,a good approach some times is use DI3 and Max the gain to 99... Impact will generally run pretty quiet here even in some bad emi.

Don't forget to try freq offset when your detector gets noisy.
The freq offset on Impact works well.
Frequency shift works great. When that failed for me 1 time, COG mode did the trick also. I think I was hunting over a burnt coal dumping area...

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  #685  
Old 10-11-2017, 09:24 AM
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Originally Posted by mudwhale View post
Frequency shift works great. When that failed for me 1 time, COG mode did the trick also. I think I was hunting over a burnt coal dumping area...
I have this one area, where coal pile used to be,,have dig chinks of it.
Makes all my detectors go bonkers when over.

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  #686  
Old 10-11-2017, 06:38 PM
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Originally Posted by tnsharpshooter View post
I have this one area, where coal pile used to be,,have dig chinks of it.
Makes all my detectors go bonkers when over.
Somehow, the process of the actual "burning" of the coal, brings out all the trapped iron into a higher concentration. the microscopic particles are melted into a kind of like a glob if you will. When you hit these spots you know it!!

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  #687  
Old 10-11-2017, 10:43 PM
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Originally Posted by mudwhale View post
a kind of like a glob if you will!
Grew up with a coal furnace. We called them "clinkers"

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  #688  
Old 10-12-2017, 06:27 AM
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Many of my fields are full of coke, it was used for the steam engines that powered farm machinery back in the day.
The likes of FBS machines don't react much to it, single freq machines love it, some like the Deeptech units have coke buttons to ID it.
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  #689  
Old 10-12-2017, 07:28 PM
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Originally Posted by Semtav View post
Grew up with a coal furnace. We called them "clinkers"
The father in "A Christmas Story"...LOL

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Last edited by mudwhale; 10-13-2017 at 08:37 PM.
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  #690  
Old 10-12-2017, 07:30 PM
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Originally Posted by ghound View post
Many of my fields are full of coke, it was used for the steam engines that powered farm machinery back in the day.
The likes of FBS machines don't react much to it, single freq machines love it, some like the Deeptech units have coke buttons to ID it.
Interesting. Most early farm engines here were "Hit and Miss" engines running on gas or kerosene.

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  #691  
Old 10-12-2017, 11:19 PM
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Originally Posted by mudwhale View post
The father in "A Chhristmas Story"...LOL
Had to look it up. Don't think I ever saw the whole show.

Sent from my E6810 using Tapatalk

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  #692  
Old 10-13-2017, 08:39 PM
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Originally Posted by Semtav View post
Had to look it up. Don't think I ever saw the whole show.

Sent from my E6810 using Tapatalk
It's a cult classic Christmas movie and my favorite!

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  #693  
Old 10-21-2017, 03:57 PM
Shari Shari is offline
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Today finds with Impact and 20 GHz. Scythians, 7th century BC and 1-2 AD.
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  #694  
Old 10-21-2017, 08:17 PM
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Originally Posted by Shari View post
Today finds with Impact and 20 GHz. Scythians, 7th century BC and 1-2 AD.
That's an old one.
Hard for me to find something that old.

Congrats

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  #695  
Old 10-21-2017, 10:29 PM
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Shari --

VERY cool digs! Wow!

That is REALLY cool!

Steve

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  #696  
Old 10-22-2017, 05:33 PM
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Saoirse Saoirse is offline
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So I got the IM40 (15" x 14") coil for the Impact and this is my impression from a short hunt with it.

It's heavy! I usually swing the 11" x 7" with the shaft fully extended, not this one.

I tried it on a non trashy beach and used the following settings after a factory reset:

Dry sand -
DI2
Gain 85
Disc 15
Freq 20kHz
Everything else as is

Results - unusable, chirping and falsing, lowered the gain to 75, then 65 and the Disc up to 25 then 35 and while it maybe (hard to tell) quietened down a tiny bit still unusable (yep, it was connected properly and the batteries were good)

Wet sand - (after a factory reset)
COG
Gain 80
Disc 15
Freq 20kHz
Everything else as is

Results were the same as above.

I was very short on time so didn't have the chance to test other settings or frequencies.
This is a fairly clean beach and the 11" x 7" coil runs pretty quiet on it.

My first thought was that the coil is faulty because I'm so used to the 11" x 7" running so quiet but I'll take it out again and see what happens with different settings.

Anybody have any experience with this coil?

Photo is for size comparison
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  #697  
Old 10-22-2017, 11:55 PM
tnsharpshooter tnsharpshooter is offline
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Originally Posted by Saoirse View post
So I got the IM40 (15" x 14") coil for the Impact and this is my impression from a short hunt with it.

It's heavy! I usually swing the 11" x 7" with the shaft fully extended, not this one.

I tried it on a non trashy beach and used the following settings after a factory reset:

Dry sand -
DI2
Gain 85
Disc 15
Freq 20kHz
Everything else as is

Results - unusable, chirping and falsing, lowered the gain to 75, then 65 and the Disc up to 25 then 35 and while it maybe (hard to tell) quietened down a tiny bit still unusable (yep, it was connected properly and the batteries were good)

Wet sand - (after a factory reset)
COG
Gain 80
Disc 15
Freq 20kHz
Everything else as is

Results were the same as above.

I was very short on time so didn't have the chance to test other settings or frequencies.
This is a fairly clean beach and the 11" x 7" coil runs pretty quiet on it.

My first thought was that the coil is faulty because I'm so used to the 11" x 7" running so quiet but I'll take it out again and see what happens with different settings.

Anybody have any experience with this coil?

Photo is for size comparison
Did you try freq shift???
I have zero experience with that monster sized coil.

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  #698  
Old 10-23-2017, 09:41 AM
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Thanks for the info on the big coil. I'm getting a large coil this winter for my Impact and haven't decided which yet.

I used to love the RC40 on my Racer 2. It was heavy though.


You should have tried a frequency shift or complete change before lowering the gain that much.

Page 16 in the manual...

"To obtain maximum depth performance, to eliminate the noise caused by electromagnetic
interference, try shifting the frequency first (F. Shift). If this is not sufficient, change
the operating frequency of the device (5kHz/14kHz/20kHz) before lowering the gain."
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  #699  
Old 10-23-2017, 04:23 PM
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Thanks for the input guys, will give freq shift a try when I take it out again and let you know how it goes.

Originally Posted by tnsharpshooter View post
Did you try freq shift???
I have zero experience with that monster sized coil.

Originally Posted by Dave_e View post
You should have tried a frequency shift or complete change before lowering the gain that much.

Page 16 in the manual...

"To obtain maximum depth performance, to eliminate the noise caused by electromagnetic
interference, try shifting the frequency first (F. Shift). If this is not sufficient, change
the operating frequency of the device (5kHz/14kHz/20kHz) before lowering the gain."
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  #700  
Old 10-24-2017, 10:51 AM
Charly-in-CT-RI Charly-in-CT-RI is offline
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I ran the big coil twice last week with no differences than any of the other coils. Occasionally, I had to do a frequency shift to quiet it down.

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