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Omega 8500 Initial Observations
Posted by: RLOH
Date: January 21, 2018 10:09AM
I have always been a big fan of the Omega series and have found it to love silver coins. I had version 4 and version 5 and used each of them for an entire summer. The silver coins in the places I detect are generally in the 7 to 8 inch deep range so it is important for any detector to have this capability. Both previous Omegas would do this, but with extremely faint audio at these depths. At first, I did not like this weak proportional audio, but quickly came to recognize the sound of these deep coins.

I have a test garden with coins buried from 5 to 8 inches deep. I have a silver dime and a silver quarter both buried at 8 inches. My Fisher F5 with the NEL Sharpshooter coil can hit all targets, but with very weak audio on the 8 inch coins. I pre-programmed the 8500 in the house to lower the audio on junk targets with the copper-silver coins maxed out on volume. I started with disc 10, deep 1, master volume 7, and tones 3(proportional audio.

I breezed through the shallow coins with perfect audio. When I hit my 5 inch nickel, it was almost nonexistant. I was shocked. When I came to the deep silver coins, I could only hit them occasionally. I was now concerned. I forgot to mention that I had the 11 inch dd coil on the 8500. I can hit these coins perfectly with the F5 at 70 sens, but with weak but repeatable audio.

What now I thought. I kept the settings the same and upped the sens to 80. I got every target just about exactly like I could with the F5 at sens of 70. Now for the weirdest target I experimented with. The 5 inch nickel got an audio signal that sounded more like a static buzz. As I swept this nickel from all angles, I came to realize this was the audio signal for nickel in three tone, four tone, and 5 tone. It could easily be dismissed as static, but it is the real tone id for nickel. I don't like that sound at all, but will get used to it as I spend more time with the 8500.

I experimented with the deep settings and found deep 2 and deep 3 to do nothing to enhance the deep target audio. I have some three-four bar ground so maybe this is why these settings don't help. I tried deep 2 and 3 with a multitude of sensitivity settings and nothing changed.

Now for the eye opener. I went from three tone to 5 tone with eliminated proportional audio. I have used every Explorer series for many years and I never ran them with wide open gain which is what the 8500 in 5 tones does. With the sens on 70 in 5 tone, every target hit like it was two inches deep! I like to hear deep coins with weak, but repeatable audio, but this setting 'wakes up the ground". I did find it also causes many high tone pops and clicks, but deeper targets will repeat perfectly.


With a somewhat base of knowledge, I found a south facing hill in my backyard to try it "in real life" My first settings sens75, deep 1, 5 tone, disc 8. I have hunted my yard many times and was hoping for at least one clad coin. After 5 minutes of this five tone, I was quickly tiring of all the surface pops and clicks which are very loud. I upped the sens to 85, tone to 4 and kept all other settings the same. I found a 6 inch deep quarter next to a piece of wire. I found a 7 inch deep dime with weak but perfect audio. I was just about ready to quit when I heard a double high tone that read 86-87, i was expecting a shallow quarter which many time will give a double beep. When I pinpointed, I realized there were two targets about 4 inches apart and they were reading 5-6 inches deep in pinpoint. First came aclad quarter 7 inches deep and then a clad dime at about the same depth. This was a picture of perfection at separating two close targets and they were both fairly deep which was impressive.

Today it was 37 and misting so I headed to my favorite park and hunted a hill that was south facing. It was about half snow covered so I hit the clear spots. I opted for sens of 85, deep 1, four tones, and 0 disc. I got many one way high tones and ignored them as I had to chisel through frozen ground. I finally got a static buzz that high toned from a 90 degree angle. The buzz is that pesky nickel tone, but with the high tone, I dug it. For some reason, this type of audio has proven to be deep nickels with just about any single frequency Fisher detector I have ever used. Today's target confirmed my previous findings. It was a 7 inch deep 1954 nickel. I was quickly running out of desire to detect as my hands were starting to get cold. I wanted to hear one more deep target before I packed it in. Finally I got a 84-86 faint, repeatable target that pinpointed like a coin. It turned out to be an eight inch deep wheat penny.

With only a short time with the 8500 in my hands, I think I can grow to like and do well with this detector. As Mike said, it is a different detector from the 8000, but a very nice detector at that. I don't care for the nickel range audio, but the silver-copper audio is clear enough for me to do well. It will probably be several months before I can do more testing. I am hopeful that the deep 2 and 3 settings might come into play for some deeper coins, but only time will tell. At any rate, the 8500 is a solid bargain at 399.00

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A nice review RLOH
Posted by: Elton
Date: January 21, 2018 10:21AM
If you could only have one..Would it be the F5 or the 8500 at this point in your testing..



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Re: A nice review RLOH
Posted by: RLOH
Date: January 21, 2018 12:12PM
Elton, I have spent so much time with the F5 that I know exactly what it will do with depth and accuracy. I have always thought that the Omega was a digital version of the F5 and their capabilities were nearly identical. As I think back to my last Omega 8000, I seem to think it was a deeper detector than the F5. I will confirm this with the 8500 and the F5 that I currently own. I think there are some settings that might unlock some depth increases on the 8500.

I am thinking the the unmodulated 5 tone setting with volume and sensitivity settings might be the key to the 8500. The audio is not the same between the 8000 and 8500, but if you approach the 8500 as a new, different type of detector, you will get use to it.

What I might do is keep the Sharpshooter on the F5 and the 11 inch on the 8500 and carry both, but only time will tell if this is the way I will do things.

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Re: Omega 8500 Initial Observations
Posted by: Quisp
Date: January 22, 2018 10:49AM
Quote
RLOH
...with wide open gain which is what the 8500 in 5 tones does.

Hey RLOH. Wow, thanks for the great write up. Can you explain your comment above? Reading up on the modes in the users manual, I see the statement about the Deep Modes affecting the gain but nothing about the 5 Tones mode changing the gain. I'm new to the 8500 and I have not had a chance to try it out yet because of the frozen ground. It looks like I have a lot to learn.

Thanks,
Dan



Equinox 600, Teknetics Omega 8500, NEL Sharpshooter & Tornado coils, Garrett GTA-1000, Garrett Pinpointer

Re: Omega 8500 Initial Observations
Posted by: RLOH
Date: January 22, 2018 02:57PM
Dan, the 5 tone amplifies the volume of every signal, even the smallest piece of iron, can slaw, minute rust, and etc. In my test garden,using four tone I was getting a very weak signal on my 8 inch deep silver coins and when in 5 tone, these weak signals got amplified to the point that they sounded like two or three inches deep. Since I cleared my test bed of all metal, the loudness really jumped out with no other metal to distract me. I will probably not use the 5 tone option because of the huge amount of trash in the spots I hunt. It is just too loud and noisy for my liking.

Today I got to see exactly how the Deep 2 and 3 works. In my test garden, there did not appear to be any distinct difference when I tried 2 and 3 over 1. I have read that deep 1 is more like the original Omegas. Today I got a signal that was either very small or very deep. I heard this in deep 1 with four tones. I left the detector in four tone and repeatedly swept the target in deep 2 and it got clearer-slightly louder. I tried it in deep 3 and it got even slightly better. The target was in the mid 80's and had a repeating high tone. I was hoping for a deep coin,but it turned out to be a very small rivet from about 5 inches deep.

I believe deep 2 and 3 draws out the signal making it longer. I also found that you must slow up your sweep speed for deep 2 nand 3 to work best. I originally thought that I would have no real use for deep 2 and 3, but today I saw what these setting can do. I will definitely play around with deep 2 and 3 come spring.

I am only beginning to learn the 8500 and as I spend more time using it, my findings-opinions will probably change even more.

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Re: Omega 8500 Initial Observations
Posted by: Quisp
Date: January 22, 2018 07:16PM
Thanks for the quick response. A test garden. That's something I've never done but probably should. Besides a set of coins, do you include any other objects in your garden? Not sure I want to part with a silver coin. I did find two silver dimes in a Coinstar a few weeks back so I may sacrifice one of those for the good of the cause.

Dan



Equinox 600, Teknetics Omega 8500, NEL Sharpshooter & Tornado coils, Garrett GTA-1000, Garrett Pinpointer

Re: Omega 8500 Initial Observations
Posted by: RLOH
Date: January 23, 2018 05:31AM
Dan, I have had a test garden at all the places I have lived since I started detecting. I set mine up with zinc, copper penny, clad dime,nickel, clad quarter, silver dime, silver quarter. I place each denomination at four inches and eight inches. I do not put silver coins at four inches, only at the eight inch mark. I also scatter various junk targets(every type of pull tab, beaver tail, bottle caps, rusty washers) at various depths. One bit of advice. Before planting(burying) run your detector over the area you are going to use in all metal and dig out all targets that you can. I had one pesky piece that I could not find in the area of my clad dime. I did not remove it, but choose to use it to my advantage as a natural masking target. My Safari struggles with it, but the 8500 hits it perfectly, better than any of my previous detectors.

Putting in a half hour in a test garden is better than hours in the field with a new detector. You can compare settings and see for yourself rather than trying to remember what different settings do.

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Re: Omega 8500 Initial Observations
Posted by: Quisp
Date: January 23, 2018 06:46AM
Thanks for the test garden insight. Once the ground thaws, I'll have to get to some planting.



Equinox 600, Teknetics Omega 8500, NEL Sharpshooter & Tornado coils, Garrett GTA-1000, Garrett Pinpointer

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