omega sensitivity with emi

[digsgti]

Ive been to about 7-8 different locations with my omega and maybe could turn my sensitivity up high at one of them. Mostly hunt at houses and parks that have powerlines with in eye site but I dont think Im close to them.( I dont know what to consider close since I am still a newb.) I put my omega in AT mode then turn it on and turn the sensitivity up to I hear some beeping, then I ground balance which always is close to 55. After that I put it in disc mode set to 16 and turn the sensitivity up and get to about 60 when the display jumps back and forth and beeps. If I start to swing the detector It calms down but I get a pretty good amount of falsing. I read the posts on here about everyones finds and they almost always have a 90's sens. setting. Do you guys have the same issues as me and run your omega with high sensitivity anyway or is that where your omega starts to "jump".

 

[Cache Man]

I don't have much any problem with mine any more Do a search on my posts. this was reported on the fisher F-70-75 forum and I done a lot of research and you will find what helps a lot, I have done this to all my detectors that suffered from EMI I always run all my detectors
with the sens turned up wide open, I always ground balance with them turned up all the way, as I don't look for surface coins all old silver I have ever found in 25+ years is 6" deep with 90% of it 8" to 11" and beyond. The Omega is a very very good detector with the 11" DD coil
The omega is the Fastest way to clean out the silver dimes down to 8" and quarters to 10". Good Luck HH

 

[Monte]

Ive been to about 7-8 different locations with my omega and maybe could turn my sensitivity up high at one of them.

In time you will work more sites with your Omega and have fewer or no problems with a higher Sensitivity setting. If you've only hunted 7 or 8 locations with only one allowing a higher Sensitivity setting, then maybe you just need to work more places.

On a typical day when I set out in search of 'stuff' I will stop and detect anywhere from 5 to 8 or 9 places, and on the next day I head out I hunt the same number of different places. Some I need to reduce the Omega to about 55 to 65 on the Sensitivity, but at others I'll run it at maximum, or very close to it, and not be bothered.

Mostly hunt at houses and parks that have powerlines with in eye site but I dont think Im close to them.( I dont know what to consider close since I am still a newb.)

Sometimes I hunt parking strips and yards close to power lines and they can often be a problem. I also hunt many schools and at maybe 50% of them I have some unstable operation and need to reduce it. Maybe a park or other site that is close to power lines or some other source calls for adjustment. That's just the way it is. There have been and are, many detector models available that can operate at or near the maximum setting but you never hear any interference. Reason? Even at their 'max' setting they still don't have the performance of some other makes/models. I'd rather have a detector in my hands that allows me to adjust for increased performance when conditions allow. That would be increasing from something like 58 to the maximum of 99 on the Omega.

I put my omega in AT mode then turn it on and turn the sensitivity up to I hear some beeping, then I ground balance which always is close to 55. After that I put it in disc mode set to 16 and turn the sensitivity up and get to about 60 when the display jumps back and forth and beeps.

I often run with my Discrimination at '1' but do increase it to 16/17 if iron nails are a problem. You have mellower ground to search than I do as I'm usually in the 70's with my Ground Balance set, and sometimes I need a Ground Phase setting in the low 80s. In milder ground as you sweep the coil you'll have less bad iron signal to deal,with. In higher mineralized environments you can sweep the coil at a normal pace and it will ignore the interference better because there is more pronounced ground signal being filtered (processed).

If I start to swing the detector It calms down but I get a pretty good amount of falsing. I read the posts on here about everyones finds and they almost always have a 90's sens. setting. Do you guys have the same issues as me and run your omega with high sensitivity anyway or is that where your omega starts to "jump".

Even when set at about

 

[sekypaleo]

Yes, The Omega is very sensitive to EMI. Unless I am CW relic hunting way out in the woods then about half the places I go I cannot get my sensitivity over about 60 also, even if I am a LONG ways away from high tension power lines. I have heard this is a problem with all the new First Texas digital machines (F70/75, F series and the Tek machines). Supposedly putting EMI chokes available from Radio Shack on the coil cable will help with this. So, no you are not alone.Bill

 

[digsgti]

Thanks for all the replies everyone. I guess Im not getting anything unusual. The EMI collars from radio shack sound interesting...
I

 

[earthmansurfer]

I think max sensitivity on the Omega is at 70 and from that point on it's a threshold or something like that? Can somebody chime in here? I do know they combined two controls into one.

So, if you can get to 60, you are probably at around a good 80% of depth. Do some testing when you find a target to really get an idea.

 

[jbow]

the sens is linear until 70. Above 70 it increases more geometrically (maybe not exactly geometrically but it is no longer linear).

In other words from 1 to70 the sensitivity increases by the same ammount each time you increase a number. Above 70 it increases more with each number than it did below 70... above 70, one number may be like a three number increase of the sens below 70... I hope I am being clear enough, i'm not sure how to explain it and FWIW in this statement, "one number may be like a three number increase of the sens below 70" the number three is completely arbitrary, I just pulled it out of the air.

J

 

[chillyhiker]

Ive used one and there seems to be some improvement but not completely

 

[Cache Man]

Above 70 is the (Gain) target size, if you don't turn it all the way up you will not find dime sized targets at 7"-8" with the DD coil, the other coil is just about worthless for finding old silver. HH

 

[Smooth23]

Anyone have a part number for this so called EMI Collar? I'd like to pick one up to try. I've got an area that I know will produce if I could fight through the EMI

 

[sekypaleo]

Search the Fisher F series forum for EMI choke