Ever used this

[Rossiter25]

I found this on a website I was wondering if anyone has used anything like this for emi?

 

[Frankn]

There's no use for that on a detector. It is an RF choke. You might have one on your computer power input cord. Frank

 

[Rossiter25]

There's no use for that on a detector. It is an RF choke. You might have one on your computer power input cord. Frank

Okay I didn't know that but is there a device that clips on to your detector somewhere emi or rfi filter. For emi interference. Some kind of aftermarket device. I have heard about them on some forums.thank you

 

[Ism]

That is the device you see mentioned from time to time. Some people are believers but science doesn't support the claims.

 

[Chug And Red]

That is the device you see mentioned from time to time. Some people are believers but science doesn't support the claims.

You Might want to open your printer, computer, and electronic devices to See for your self they Have been Used for Many years HH Chug

 

[Tom Slick]

I believe that if they added anything to the performance of a detector, the manufacturers would spend the $2.00 to include them on all new detectors. Yes, they work on computer screens and printers, but they do nothing for metal detectors. But like P.T. Barnum said " " .

 

[woof!]

Once upon a time, electrical interference was a relatively simple subject, but most engineers weren't up to date on it. While the electric companies were trying to get light dimmer and electric motor interference cleaned up in the VLF spectrum, the world exploded in the UHF spectrum. In the UHF spectrum, circuits large enough to look at with the naked eye don't exist: everything's either a transmission line or an antenna. Electronic components designed for the VLF spectrum where metal detectors work, the data sheets don't even tell you what those components will do under the influence of a UHF signal. Rational design for high performance is impossible.

The clip-on chokes do nothing for VLF interference, they work (if they do) in the UHF range where trying to predict what will happen is in the realm of voodoo and black majick.

The beep business is competitive, but to my knowledge no manufacturer includes clip-on ferrite common-mode chokes. There are reasons for this.

1. They help sometimes, but the manufacturer is unable to say when or how often or how much. Doesn't matter which manufacturer, we're all in the same boat on this one.

2. In the beep business, regardless of manufacturer, one of the most common points of failure is the searchcoil connector. Clamp 50 grams (about 2 ounces) of dead weight on the cable right next to the connector, and you've just invited a warranty repair.

3. Clip-on chokes are a consumer commodity item you can buy at Radio Shack (in the USA), and I suppose they're widely available elsewhere for reasons having nothing to do with metal detectors. The way a metal detector manufacturer can avoid the headaches of clip-on chokes is to dump the problem onto the customer. If a warranty repair results, the smart customer says nothing about the clip-on choke.

4. Beep companies get quantity discounts, but not like what mass market computer products get. We're small potatoes and the manufacturers of components don't like the effort required to spud us out of the ground. Tom suggested $2 as a representative price tag, and that's about right, I've got examples sitting on my desk right now.

5. Two bucks is not throwaway money for a beep manufacturer, it cuts directly into the after-tax profit margin of the entire operation, and those margins are slim. In the USA which is regarded as having a comparatively strong economy compared to most other countries, the interest rate is nearly zero because there are so few ways to invest that can show a profit. It's an easy test to take: provide the answer to the following question: "If someone gave you $100,000 and would kill you if you didn't return it with profit a year from now, would you take it?" If you can't answer that question, you shouldn't be in business, and neither should we. (I'm not saying that the answer has to make the first year look good, only that the answer has to make enough sense to stave off the investor whose perception of reality otherwise ends one year from now.)

*************

SUMMARIZING:

1. If you've got problems with electrical interference that you can't resolve through "the customary methods", spend a couple of $US or whatever ya got on a clip-on choke, and try the damn thing out.

2. If it works, tell us. If the choke wrecks the connector, tell us that too, but privately por favor. This whole situation is evolving and we'd rather solve real real problems than to defend publicly against complaints that we have no means of solving. As a matter of international law, metal detectorists have to put with the havoc created by licensed transmitters.


--Dave J.

 

[Rossiter25]

I got one today I will test it out tomorrow. The football field by my house I can turn the gain up on my mxt right after the triangle before it shifts into the crosshatched section. Even a hair more than that the emi kills me. I set my gain up at that spot the same every time lets see if I can get anymore. Just a thought I could buy 50 of these and run them down the whole cable!!!!!!

 

[Rossiter25]

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=697161"/>

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=697162"/>

I got one today I will test it out tomorrow. The football field by my house I can turn the gain up on my mxt right after the triangle before it shifts into the crosshatched section. Even a hair more than that the emi kills me. I set my gain up at that spot the same every time lets see if I can get anymore. Just a thought I could buy 50 of these and run them down the whole cable!!!!!!

I hooked it up today and it does improve performance. I will stand behind this device 110%!!!!!!!!

 

[63bkpkr]

Rossiter25, Thank you for the question and input.

Woof/Dave J., thank you for your ummh succinct final comment.

IMHO, good question/good answers.....63bkpkr

 

[Tom_in_CA]

reply

I hooked it up today and it does improve performance. I will stand behind this device 110%!!!!!!!!

Psychosomatic results ?

 

[Sandman]

Say what Tom? Anyway that's what I was thinking.

 

[Rossiter25]

Psychosomatic results ?

Some people don't like change. I can understand that. It works for me. If you want you can come to my home and I'll show you. It's a very easy demonstration.

 

[FriscoT06]

This is a very interesting thread! Congrats on your results!!