Challenge Completed And Missed Nuggets Found

[geek4gold]

2 hours ago, flakmagnet said:

How do you do that? Interested...

unplug it.?

[jasong]

4 hours ago, Condor said:

Re: EMI with the X-Coil and GPZ7000

Here in Sunny Yuma we have Marine Corps Air Station with training flights every morning.  Nearby we have Yuma Proving Grounds and they have the High Altitude Low Opening parachute training.  They use a C130 plane to haul the paratroopers.  To get to 30,000 ft for the drop they have to circle within their airspace climbing all the while.  When they are up and circling the EMI is awful.  The 17" X-Coil is nearly unusable when that C130 is climbing.  I've switched to the 15x10 X-Coil on those days and the EMI is manageable.  The stock Minelab 14" coil also suffers from the same EMI, Beatup can probably chime in on his experiences with the stock coil.

I think something similar happens here too with all the air traffic. Jets flying in to Vegas all the time and low since they are on landing approach, tons of helicopters doing Grand Canyon tours, planes flying low for tours. Then Nellis Air Force Base nearby. I don't know if the jets make noise like the big old C130 engines but those military choppers I can hear on my detector.

And of course Area 51 north of Vegas, but I can't talk about that and you never saw this post and aliens making noisy devices just to slow my detecting down definitely don't exist. ?

I actually found a string of broken circuit boards and antenna components this year all in a long 2 or 3 mile line like a meteorite strewn field. From the 60's. Near as I can tell it's some sort of missile telemetry system, or from an experimental jet or something which they self destructed in the air? No idea. Found 3 weather balloon sensor thingamajigs too but those are just interesting and not really noisy or odd.

[jasong]

3 hours ago, flakmagnet said:

I would suggest you give an SP01 a try. I honestly think you will be pleased.

 

I'd try one out if they want to send me one. ?

But, I'm hesitant to buy one because it seems to me the SP01 filter is doing something similar to Smoothing in that it's pulling out some information from the audio stream just like Smoothing is. If so, then I might as well just use Low Smoothing for free.

The problem I see is that people insist on running no smoothing because it's a filter. But then they compress or filter the same audio stream with the SP01 to solve that problem. And I'm not convinced enough that's a problem I need to pay $300 or whatever to find a solution for since I personally have no problem running Low Smoothing when I need to.

If you disable the filters, the SP01 is now just an audio booster. But I personally have found the WM12 to be more than sufficient for me, or head phones when it's reaaaaally windy and I'm not wanting for more volume.

[Gerry in Idaho]

10 hours ago, Gold Catcher said:

Complete agree. I can't recall a single time where a target that I heard at gain 18 would not be heard at gain 12 or even 10. In particular with HY/normal/ smoothing off. I hardly ever use smoothing.

I'm a Smoothing Off guy as well.  Usually run GAIN around 10 to 12.  Now I don't recommend this in the Spring at Rye Patch, as the soil is to damp still.

[afreakofnature]

I would not mind using the SPO1 more.  I bought one a along time ago. Back when they were $200 LOL. However I never use it I’m actually thinking about selling it, not because I don’t like it but I just don’t like having all the extra cords. I like the WM12 and it just hooks to my shirt.  If I have to use the SPO1 then I need to have the WM12, that and another speaker. It’s just too much. Now if they made one that just would replace the WM12 all as one I would buy it. I did suggest that a while back, I was hoping maybe they were making one.

[Gold Hound]

12 hours ago, jasong said:

The EMI situation in places close to massive population centers like in California or parts of Arizona is another level compared more remote, less populated parts of Australia, or even places like NNV. Just California has almost double the population of the entire country of Australia. Phoenix metro area has basically the entire population of New Zealand. Just as two relative references. Lots of military, power generation, air travel, and other stuff that produces EMI that travels some distance.

The SP01 is compressing/limiting/expanding the audio. I'm not sure which one exactly since I don't own one. But any kind of compression by definition destroys some part of the audio. So in that way, it's not a whole lot different than what low smoothing and boosting your sensitivity/volume is doing. In fact, before the SP01 came out, I posted about just such a thing on that old 4umer forum and how you could emulate such an idea with threshold and volume controls.

The bottom line to me is that those settings are there for a reason and a place. Where we happen to be is a particularly noisy place. And people should not be afraid to use a setting (or hardware like sp1) or say they never will use it, if the results are more gold and less headache.

That is after all, one of the principal design concepts of the 6000 from what I can tell based on the limited info we have.

I agree with you Jasong.

I tried various boosters and did not find any difference that I could not replicate by using the settings.

The settings are there and I use them...

And all of the extra wiring is a real pain! The detector is wireless and I like it that way!

[GB_Amateur]

On 1/29/2021 at 10:59 AM, strick said:

Thanks for that info as I'd never heard of it before...where does it come from? 

strick 

"That info" being Geof's mention of 2^6 = 64 times as much power to double the depth.  On page 4 of the current thread -- right at the top, Steve provides a link to another forum thread where depth improvements, etc. were discussed.  On page 2 of that thread there is a post by Rick Kempf where he quotes Dave Johnson and then links to an interview with Dave and John Gardiner from which Rick grabbed the quote.  I repeat that link here:

http://fisherlab.com/hobby/davejohnson/davejohnsonjohngardinerinterview.htm

 

 

[jasong]

It comes from the decay of the B field portion of the signal in the near field of an antenna.

https://en.wikipedia.org/wiki/Near_and_far_field

 

[mn90403]

I just read this entire thread for the first time.  I read it backwards!  There is a lot of information here for my pea brain to absorb.

Thanks Jasong.  If I was out and about I'd show up and let you use the 15x10.  I don't know how I can get it to you now.

Mitchel