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:fisher: Upgraded F70 Performance :twodetecting:

M

Mr.Bill

New member
Received the software reprogrammed F70's a few days ago, but just had a chance today to set one up, and try it out.

There is a difference in depth, favoring the new one, over the other F70's I returned. I have some real deep targets that this new unit hits on easy. I set it up default discrimination, (15), Slow circuit reset, 2F tone mode, "0" threshold, #99 on the sens. Fast Grab GB. First slow sweep over a very deep coin, strong signal with a #95 target reading.

I changed the sens. setting to #75, still a good strong response. Re-set the circuit speed to "DE", lost target. Forgot, needed to increase sweep speed. With a fast sweep speed came a response from the target coin, and it ID'ed at #75. That's close to what it should be. Playing around just as it started raining, it was quite apparent that slow circuit does require a slow sweep speed, and the fast circuit, (DE), likes a brisk sweep speed.

I choose a real deep coin to test with, because that's when little differences in sweep speed, and other small adjustments, show up as to what they can or can not do.

Well just as I was starting to have a little fun it started raining hard, so that brought things to a end.

Yes, the ground balance setting sets up for both Autotune, or Discriminate mode.

More when the weather gets better.
 
How would you compare the depth of detection using a slow sweep in the SL mode, compared to a fast sweep in the dE mode? I know this sounds nuts, but the older I get, the faster I sweep. :detecting: I know a couple of my detectors (XLPRo, XLT) will hunt deeper with a fast sweep. I don't know (or care) if a fast sweep in dE mode is deeper. I'd just like to know that when I am using it, I'm not sacrificing depth if I were to make myself use SL mode and sweep slow. I know the literature says the SL mode is deeper on higher conductive targets. But if you find it to be a "wash", that would be good news! Thanks. HH Randy
 
The De and slow settings are the recovery speed and not the sweep speed. You can swing as fast as you want in both speeds.
In DE (fast) you loose some depth and gain target separation and in slow you gain depth and loose some separation.

Andy,NM
 
which I was responding to, sweep speed does play a role.......

"I changed the sens. setting to #75, still a good strong response. Re-set the circuit speed to "DE", lost target. Forgot, needed to increase sweep speed. With a fast sweep speed came a response from the target coin, and it ID'ed at #75. That's close to what it should be. Playing around just as it started raining, it was quite apparent that slow circuit does require a slow sweep speed, and the fast circuit, (DE), likes a brisk sweep speed."


I recognize the difference between fast and slow recovery speeds, compared to fast and slow sweep speeds. Frankly, in many instances, they do parallel one another. Again, I was wondering if Mr. Bill could determine any marked depth differences between the two scenerios, fast sweep at dEfault speed and slow sweep at SLow speed? HH Randy
 
n/t
 
Digger

It is the circuit re-set speed that we are adjusting, but the use of a faster circuit speed also may allow the use of a faster sweep speed. The reason being is the circuit can now keep up with the faster coil speed. Having a slow circuit reset speed, and sweeping fast would cause the coil to be a step of so ahead of the circuit. The circuit always trying to play catch up, and reporting things too late.

I didn't do any scientific testing, I just had the unit in slow mode, noticed the response depth, and when I switched over to DE mode, using the same sweep speed, I lost the target, (target at 12"). I picked up the sweep speed without making any other changes, and bingo, there was the target loud & clear. Detectors do act different on deep target than they do on shallow ones. Testing with fringe targets, allows one to see results of adjustments made easier, faster. I doubt that one would hardly notice the circuit speed differences on a shallow quarter target. The target strength would just be too strong in either mode.

The main reason your XL Pro & your XLT do so well with a fast sweep speed is because there 4 filter circuits, and they require a fast sweep to gain any appreciable depth. On the F70 the slow circuit speed is giving the electronics a tad bit longer to analyze whats below the coil. It would be just like adjusting the S.A.,T. if it had such an adjustment. Mind you this thing is microprocessor controlled, and I'm a more analog oriented guy. With microprocessors you can make it do almost any combination of functions at the same time.

It's just like the old adage. One should always set up a test garden to check out any new detector their going to use, so you have an idea whats happen when you use it in the real world. I always suggest to my customers if you make an adjustment, make only one at a time, and don't go on to another adjustment until you fully understand what the adjustment did you are leaving. Doing it this way and one always will have a good idea what goes on with their detector, and that spells more finds. :)
 
I generally don't mention the depth, because the depth I get here in my soil you may never achieve in your soil. So it would be a moot point.

In this case I will, because I forgot, and mentioned it in my post to Digger. It was a quarter at 12" that I planted 6 or 7 years ago.
 
making adjustments one at a time. The Explorer, DFX and XLT have all proven that to me, over the years. I do like the four filter units, for the reason you mentioned. And like you, I am more of an analog guy. Guess that is why I still like to use my XLPro. It's not that I don't appreciate the technology of our digital age. But there is still something about watching a needle make those every so slight deflections, that I can't learn from a digital display.
I built a very good test garden in my yard in 89. Coins, jewelry and various trash items. I use it extensively with every detector I have! As you suggest, nothing like first hand experience when learning a detector. Thanks again. HH Randy
 
I am curious as to what other machines you have ran over this coin and did a good job of IDing it correctly.

One more question. I had a F-75 for about 6 months before I got rid of it. Liked everything about it but it was a little to noisy for me. Is the F-70 a quieter machine than the F-75 and less prone to interference? Your input is always appreciated.

Thank you.

KurtB.
 
n/t
 
BILL,I HAVE A QUESTION FOR YOU.I GOT TO TRY AN F70 THE OTHER DAY FOR A FEW MINUTES. IT'S ABOUT THE LIGHTEST MACHINE I'VE SEEN. THE PROBLEM I ENCOUNTERED WAS THE MACHINE WOULD NOT LOCK ON A TARGET.EVEN WHEN WE PUT A QUARTER ON TOP OF THE GROUND,THE ID SAID 81 BUT EVERY TIME THE COIL WAS MOVED BACK OVER IT ,IT WOULD GO BETWEEN 64 AND 87.IS IT SUPPOSED TO DO THIS?ON MY CZ-5 WHEN IT LOCKS ON AN ICON IT STAYS THERE. THANKS FOR YOUR INPUT.
 
Not certain exactly whats going on there, but it sounds like perhaps the sweep speed was too slow, and shallow. A brisk sweep about the width of your shoulders give the best results for lock on ID. It's in the owners manual. If you did a little short wiggle of the coil over the target, it would give you a not so good reading.
 
n/t
 
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