Noise Cancel and backlighting

[Anonymous]

- While hunting yesterday, I noticed that when I turned on the backlight the machine lost the threshold. I had been hunting with a fairly constant hum and then it was gone. I turned the backlight on and off and got the threshold to come and go. I performed noise cancel with the backlight "on" and the threshold returned.
Has anyone else noticed this? I would have thought the backlight should not effect performance, but I was not sure at that point.
- Had another person hunting with their explorer and did a comparison of the noise cancel settings. Performed the noise cancel at the same spot, and held perfectly still each time. Only one machine on at a time while testing. First machine had a reading of 10, the second read 1. Moved to another spot 15 feet away and did it again, first machine read 10 again, and the second read 3. Should there be this much difference between 2 machines?
Set both machines to same settings, other than noise cancel, and played in my test garden. Found the second machine to be more stable while in auto mode, but it did not have the depth of the first machine in this mode. But I changed to manual mode and the second machine had better depth than the first machine. It went deeper with better sound.

 

[Anonymous]

Carefull with two machines near each other, remember one is picking up interference from the other, so...you should only do a noise cancel on one..if you do them both at same time, one will be jumping frequncys while the other machine is sampling the air, and the other may pick one that was quiet at the time, but the other ended up on a different one...they should end up on a different number. usually ours end up at 5 and the other 11 or 10.. sas for your backlight , its possible that its emiting some sort of interference so maybe if we use it, we should do a noise cancel with it on, and another when turning it off... cant hurt...just dont do 2 machines at the same time <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT="">

 

[Anonymous]

Only the machine I was doing the noise cancel on was turned "on". The other was 20 ft away and "off".
Did not think you should get interference from within the machine. Minelab should have taken care of this issue with EMI testing. But if everyone else experiences this, I will have to do the second noise cancel when the backlight is on.

 

[Anonymous]

sorry, thought you were noise canceling 2 at the same time... I dont think theres too much difference in channels as long as the interference level is low...however I do do a few cancels each time out...cant hurt

 

[Anonymous]

Did you check to see if the other detector lost threshold when the backlight was turned on? and do you lose threshold in other locations when the backlight is turned on? All this checked on each and every Noise Cancel channel manually.
The threshold setting possibilities appear to have a point where they jump from having threshold to not having threshold, and at the setting where you begin to get a tone the threshold is fairly loud. So I would think it takes a great deal of interference to block out that first stage of threshold, much more than that backlight could produce I would think.
Anyway, I checked it out on mine by setting the threshold to the lowest audible setting and turning on the backlight. I then manually switched from Noise Cancel CH-1 through to CH-11 one at at time. No change occured in any way to my threshold level or sound on any of the channels.
I tested with full battery power, and in a low noise environment which may be a factor in my observations.
I believe that the Noise Channels have an effect on depth, I've seen this in one type of test. So, either the Auto Noise Cancel will find the most optimum Channel(at this point it appears to) or you will have to pick one manually and hope it's the right one. The reason I say this is because in the 7 months that I've used the XS I have only needed to use Noise Cancel maybe 4 times, was I just always in the right setting between those 4 times, hard to say.
GL

 

[Anonymous]

as it seems to affect the processer in wierd ways
like what your discribing.

 

[Anonymous]

The second machine did not lose the threshold when the backlight was turned on. I also checked this problem when I changed hunting areas (several miles apart) and it still lost the threshold.
I always hunt with the threshold set at 7. I usually have some threshold unless in high trash. The location I was hunting when I discovered the problem had threshold 80% of the time. My machine has always ran very erratic, with a lot of falsing and noise. The second machine was quite and stable (with or without the backlight) and using the exact settings.
I did not manually set the noise channel, used only auto. I did check both machines using the "same coil", so the only variable was the electronic box. Actually, I changed the shaft and coil from the first to the second machine, then noise cancelled in the exact same spot. Then I checked the noise channel that the machine set itself to. That is when I seen the 1 vs 10 positions, etc.
Wanted to see if anybody could check their machine against another partners machine to see if the noise channels are the same, or like I see, when checked in the same place and using a common coil. I think I have a problem, but wanted more input to support this.
Thanks for any help.