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EMI/RFI Choke???????
- Thread starter danrom
- Start date
Hokum seems to be the general consensus as I started in this sport...dont think you need one at all with that F70...I hunt some pretty heavy EMI areas, either dropping the sens, or switching the freq settles everything down. The only EMI that shuts me down is an approaching lightening storm, funny thing is, your detector will hear it coming a long way off without you having to look at the sky all the time..
Mud
Mud
detectingMO
New member
Them seem to help some on poorly shielded cables like lower end f2 coil cables.
Snap-on inline cable chokes won't degrade machine performance as long as you keep them away from the searchcoil.
The optimum place to put them (if you do), is close to the searchoil cable connector. The downside is that the weight hanging on the cable can eventually damage the cable or connector inasmuch as metal detector usage involves a lot of movement.
Next best place to put them (if you do), is at the headphone plug, if you use headphones. Downside, the weight may eventually damage the cable, plug, or phone jack.
They won't help with power line electrical interference or electric fences, that's low frequency stuff. Inline cable chokes work in the VHF and UHF frequency ranges (television, cellphones, wi-fi, radar, etc.) Whether they will help in a given situation depends on the specific model of machine and what the specific interference source is.
That's the theory behind it, and field experience pretty much tells the same story. May help, may not, and you may never know why one way or another.
*****************
Y'all may wonder why metal detector manufacturers don't include them. After all, they're not uncommon on computer equipment.
1. Computer equipment sits at a desk and the weight on the cable is not constantly shaking back and forth wearing out anything it's attached to. Metal detector manufacturers are not going to install a component which may help sometimes but which is likely to lead to mechanical failures and warranty repairs.
2. The thing adds cost and weight to every customer, but the benefits are spotty. The value added probably isn't worth the value subtracted.
3. The customer can always try one out and see if it helps under that customer's particular situation, for cheap, and they don't even have to get it from the factory, in the USA there's a Radio Shack almost everywhere. If it doesn't help, the customer can remove it, and no harm done to the cable or connector. That is a solution which the customer is in a better position to provide than is the factory.
The bottom line is that electrical interference is not a new problem for metal detectors, I was fighting it 32 years ago while developing the Fisher 1260-X. We've got machines nowadays that are on the order of 50 times as sensitive as the 1260-X, and in the meantime the number and type of sources of electrical interference has skyrocketed, especially with cellphones and wi-fi and we have no control over whatever comes next. Electrical interference will always be a problem for metal detectors.
For further information on dealing with electrical interference, I recommend the essay on the subject which is available on the Fisher and Teknetics websites.
--Dave J.
The optimum place to put them (if you do), is close to the searchoil cable connector. The downside is that the weight hanging on the cable can eventually damage the cable or connector inasmuch as metal detector usage involves a lot of movement.
Next best place to put them (if you do), is at the headphone plug, if you use headphones. Downside, the weight may eventually damage the cable, plug, or phone jack.
They won't help with power line electrical interference or electric fences, that's low frequency stuff. Inline cable chokes work in the VHF and UHF frequency ranges (television, cellphones, wi-fi, radar, etc.) Whether they will help in a given situation depends on the specific model of machine and what the specific interference source is.
That's the theory behind it, and field experience pretty much tells the same story. May help, may not, and you may never know why one way or another.
*****************
Y'all may wonder why metal detector manufacturers don't include them. After all, they're not uncommon on computer equipment.
1. Computer equipment sits at a desk and the weight on the cable is not constantly shaking back and forth wearing out anything it's attached to. Metal detector manufacturers are not going to install a component which may help sometimes but which is likely to lead to mechanical failures and warranty repairs.
2. The thing adds cost and weight to every customer, but the benefits are spotty. The value added probably isn't worth the value subtracted.
3. The customer can always try one out and see if it helps under that customer's particular situation, for cheap, and they don't even have to get it from the factory, in the USA there's a Radio Shack almost everywhere. If it doesn't help, the customer can remove it, and no harm done to the cable or connector. That is a solution which the customer is in a better position to provide than is the factory.
The bottom line is that electrical interference is not a new problem for metal detectors, I was fighting it 32 years ago while developing the Fisher 1260-X. We've got machines nowadays that are on the order of 50 times as sensitive as the 1260-X, and in the meantime the number and type of sources of electrical interference has skyrocketed, especially with cellphones and wi-fi and we have no control over whatever comes next. Electrical interference will always be a problem for metal detectors.
For further information on dealing with electrical interference, I recommend the essay on the subject which is available on the Fisher and Teknetics websites.
--Dave J.