I have run into some yards that give me interference no matter what channel I use on the noise cancel, it is worse with the 10.5 coil than the stock coil and I was wondering if a smaller coil (my 6") would give me less interference? Since the smaller stock coil gives me less interference over the 10.5 makes me think the "6 would be even easier to use........your thoughts?
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areas with interference
- Thread starter Goes4ever
- Start date
And of course areas differ...Larger coils cover more area and on the whole are more prone to outside interference...Had an XLT Guru friend and all he used on his unit was a 6 or 8 inch coil rather than the stock 9.5 and excelled relative depth and stability in my neck of the woods...your area may differ...
It's all about the frequency and radio harmonics. If changing the NC still doesn't allow you to operate without interference, or lowering the sensitivity, changing coils might. A smaller coil is a smaller antennae. But if it is the same frequency coil as the larger one, it might not help that much. Switching to a different frequency coil has helped me in some situations. But if the interference is from a nearby transmission tower (radio or cellular) or if it is being generated from a nearby source (electric or electronic fence) it may be just one of those sites that nothing seems to help. Even with the benefits of VFLEX. JMHO HH Randy
Mark in S.E. IA
New member
Heres something that I don't understand. Why didn't you put on the 6" coil and see what happens, since this has happen more then once.
Digger said:
Randy is right.
There will be times that interference will prove to be dominant and in those instances one should turn off the detector and walk the area looking up looking down and all around. You 'might see' the cause of the problem? Many times for me the closer I worked to a house structure (if there are houses close by) the culprit usually proved to be a satelite dish for the TV. I proved this on countless occasions by walking towards the house where the interference became greater and then turning and walking away the interference lessened.
Yes, choosing a smaller diameter coil [can help]
Don't forget to use your AUTO GB function on your X-Terra...in many cases it will help to eliminate the problem.
Experiment with different coils, sensitivity levels, noise cancel channels and keep trying to conquer the problem (if one prevails)
Good Hunting
Des Dunne
I used the auto GB, tried different sensitivity levels, and different noise cancel channels, the front yard was fine, back yard was fine. But side yard is where I had trouble, it was just a large open area, powerlines were quite aways off, I looked around and did not see anything that might be causing it. I was about out of time, that is why I did not change coils, I just took off, and wanted to ask the question if it happened again.
Digger wrote, "Switching to a different frequency coil has helped me in some situations." Which LF, MF or HF frequency would be better at handling interference?
Would a Concentric or DD be better at handling interference? Like would the 6" MF Concentric or the 6" HF DD handle interference better?
My X-Terra 70 with V-Flex is better at handling outside interference than my Musketeer Advantage.
Would a Concentric or DD be better at handling interference? Like would the 6" MF Concentric or the 6" HF DD handle interference better?
My X-Terra 70 with V-Flex is better at handling outside interference than my Musketeer Advantage.
By design, the VFLEX engineering utilized in the X-Terra will provide better "insulation" (when passing signals from the coil to the control housing) from random, unwanted, signal variations. This "noise" can be caused by RFI, EMI, electric transformer leakage or many other sources of electrical or magnetic interference. When you think about it, a detector's coil and coil cable act much like an antennae would to a radio. It receives and retransmits signals. With digital signals passing along the "VFLEX cable" those digitized signals do not become distorted (interfered with), as analog signals might. It is a matter of digitally coded "ones and zeroes" sent out in a programmed sequence, as opposed to an analog signal being floated along a copper wire.
The coil frequency that provides the "best" isolation from interference will depend on what the specific interference is. Again, all sites are different. And various sources of interference produce varying frequencies of harmonics. So to be able to say that one frequency is better than another for everyone, would be leading folks astray. However, in comparing the 9-inch concentric coils in several places I hunt, I've determined I have to lower my sensitivity on the higher frequency coil (compared to the 3 kHz or 7.5 kHz), or it chatters. I won't say that indicates it is more "succeptible" to interference. But the signal sent back to the control housing is "noisier" than the signals sent on the two lower frequencies. Without having the schematics of the three coils, I can only guess as to what causes it.
As to size..... If you had two similarly designed coils of differing sizes, but the same frequency, the larger coil would "receive" more interference due to it providing a larger antennae platform. Without having two coils of the same size at the same frequency, with one concentric and one DD, I can only speculate that the concentric would be "noisier" than the DD. This "theory" is based on the fact that the receive winding of concentric coils is located "inside and parallel to" the transmit windings. On a DD, the receive winding and transmit winding are mirror images of one another. As such, there is an inherit ability to neutralize the ground imbalance, resulting in an ability to run your X-Terra with a higher sensitivity setting. Again, without having two coils of the same size and frequency, one DD and one concentric, my thoughts are just based on a theory. JMHO HH Randy
The coil frequency that provides the "best" isolation from interference will depend on what the specific interference is. Again, all sites are different. And various sources of interference produce varying frequencies of harmonics. So to be able to say that one frequency is better than another for everyone, would be leading folks astray. However, in comparing the 9-inch concentric coils in several places I hunt, I've determined I have to lower my sensitivity on the higher frequency coil (compared to the 3 kHz or 7.5 kHz), or it chatters. I won't say that indicates it is more "succeptible" to interference. But the signal sent back to the control housing is "noisier" than the signals sent on the two lower frequencies. Without having the schematics of the three coils, I can only guess as to what causes it.
As to size..... If you had two similarly designed coils of differing sizes, but the same frequency, the larger coil would "receive" more interference due to it providing a larger antennae platform. Without having two coils of the same size at the same frequency, with one concentric and one DD, I can only speculate that the concentric would be "noisier" than the DD. This "theory" is based on the fact that the receive winding of concentric coils is located "inside and parallel to" the transmit windings. On a DD, the receive winding and transmit winding are mirror images of one another. As such, there is an inherit ability to neutralize the ground imbalance, resulting in an ability to run your X-Terra with a higher sensitivity setting. Again, without having two coils of the same size and frequency, one DD and one concentric, my thoughts are just based on a theory. JMHO HH Randy