Greg (E.Tn)
Well-known member
It seems like every time I take my F75 out, regardless of the location, I get some sort of interference that causes my machine to emit a cacophony of short beeps and chirps, accompanied by the target ID numbers jumping around. It lasts from 10-30 seconds in most cases, then stops for various periods of time, then repeats, almost as if the machine is picking up transmitted data or signals from a unknown source. It happens regardless of sensitivity settings. It's nearly impossible to detect while the machine is under this onslaught of interference, because I can't tell the false sounds and numbers from actual detected targets.
I don't carry a cellphone or electronics when I detect, and the interference occurs when I am detecting alone. At Petersburg on a organized hunt, others with F75s experienced the same thing.
The last two occasions this occurred were in two different states--near the site of the Petersburg CW battle in Virginia, and near my house in Tennessee. This doesn't mean it has only happened on two occasions--it happens nearly every time I use the machine, regardless of the location
The Virginia site was a rural timber covered site where the nearest power lines were probably a quarter to a half mile away, and no houses within a half mile.
The Tennessee site was probably a hundred yards from power lines, and the same distance to the nearest houses. * This location is about five miles from a sizeable airport.
Settings were BP/Sensitivity at 85, but lowering the sensitivity had no effect on the interference, or changing from BP to JE to DE and so forth.
What's odd about this is, when it occurs, I change to All Metal Motion, it disappears completely. That helps, of course, but I am not sure my machine gets better or worse depth in All Metal Motion.
Having the interference disappear when I switch to All Metal makes me think that EMI is not the culprit--it is something other, somewhere transmitting a signal in bursts which my machine picks up.
One thing I HAVEN'T done yet is switch frequencies to see if that makes a difference.
Question: Is All Metal Motion as deep as, say BP? When I use it, the machine is set in BP on the disc side, but when I switch to All Metal Motion, do I lose depth as opposed to BP?
Secondly, I don't think this is a quirk with my machine only. At Petersburg, there were others using the F75, and all were experiencing the same interference.
Thanks in advance for any advice, opinions, and assistance.
I don't carry a cellphone or electronics when I detect, and the interference occurs when I am detecting alone. At Petersburg on a organized hunt, others with F75s experienced the same thing.
The last two occasions this occurred were in two different states--near the site of the Petersburg CW battle in Virginia, and near my house in Tennessee. This doesn't mean it has only happened on two occasions--it happens nearly every time I use the machine, regardless of the location
The Virginia site was a rural timber covered site where the nearest power lines were probably a quarter to a half mile away, and no houses within a half mile.
The Tennessee site was probably a hundred yards from power lines, and the same distance to the nearest houses. * This location is about five miles from a sizeable airport.
Settings were BP/Sensitivity at 85, but lowering the sensitivity had no effect on the interference, or changing from BP to JE to DE and so forth.
What's odd about this is, when it occurs, I change to All Metal Motion, it disappears completely. That helps, of course, but I am not sure my machine gets better or worse depth in All Metal Motion.
Having the interference disappear when I switch to All Metal makes me think that EMI is not the culprit--it is something other, somewhere transmitting a signal in bursts which my machine picks up.
One thing I HAVEN'T done yet is switch frequencies to see if that makes a difference.
Question: Is All Metal Motion as deep as, say BP? When I use it, the machine is set in BP on the disc side, but when I switch to All Metal Motion, do I lose depth as opposed to BP?
Secondly, I don't think this is a quirk with my machine only. At Petersburg, there were others using the F75, and all were experiencing the same interference.
Thanks in advance for any advice, opinions, and assistance.