:usaflag: Help!! Just What Is White's Dual Field Pulse Delay For???:detecting:

[Cupajo]

I have found enough keepers with the DF to pay for it with a little left over!!

I really like the machine and hope to find many more goodies with it before the DF or I "cash in our chips"!!

One thing that is still puzzeling me is how the pulse delay feature is used and why it is necessary.

When I started hunting with the DF I had years of experience with PI units and have done well with them.

I had read that the pulse delay was to be clicked "on", but not turned beyond that position and all of my finds were located using that setting.

Recently I read a post from an experienced hunter who told of doing very well by leaving the pulse delay turned off, perhaps twice as well as when he clicked it on.

Will someone please clear this up for me?

Many thanks,

CJ

 

[therover]

CJ,

In reading over the DF manual, I believe that when you 'click' the Pulse Timing/Delay knob on, you are now able to adjust the delay timing to compensate for the conditions, if necessary. If it's off, I think it is at it's optimal delay timing for low conductors.

If the range is 15uS - 25uS, then off would be 15uS...the best delay setting and the most sensitive for gold on the DF...as well as salt water conductivity. So if the unit is not running smoothly, the delay can be upped to 16-25uS by adjusting the knob. In addition, since the unit also has a Gain adjustment, you could also lower the gain a bit first prior to adjusting the delay speed. I would think that would be the preferred way...start off adjusting the Gain.

You could also experiment by running the unit in the off position, and when you hit a target, increase the delay all the way to the other end, and listen for any differences. Supposedly small gold will almost be eliminated or sound weak at the other end ( ie, 25uS) where it would hit stronger in the off position, where as iron would sound strong in both settings. I think this is how the Infinium works when turning the 'discrimination' knob to the Iron Check position...it is changing the delay speed from 15uS to 25uS ( not 100% sure if that is the actual pulse delay range on the Infinium, but I read somewhere someone put one on a scope and found the range).

Hope this helped.

Caveat....all the above knowledge has been learned via reading posts by Eric Foster, Reg and other PI experts. I hope I didn't state anything incorrectly !

JC

 

[Cupajo]

Many Thanks JC,

You have cleared away a lot of confusion and now I realize that I have covered a lot of ground that may have hidden gold in it that because of improper tuning of the DF I missed!!!!!!!!!!!

Oh well, it's not going anywhere and no one else is looking where I hunt. so when I can get out there again I'll run the DF in pulse delay off and retrieve those missed targets!!

Once again JC, many thanks,

CJ

 

[therover]

Do you run your threshold barely silent or more where you can continuously hear it ? I know on my HH PI, I like to run it where I can almost not hear it, yet on my Goldquest, a tad louder and adjust the SAT to stablize it and on my Infinium, a lot louder so I can distinguish the hi/lo and lo/hi sounds from the single beeps that are either falses or chatter.

Wondering how you run the DF.

 

[Cupajo]

Jc,

I usually tweek the threshold so that it is just below a steady signal or perhaps a little more than a faint signal.

louder, constant drones of threshold signal annoy me and I think I miss subtle changes that I catch when I set up with a lower volume threshold.

I have come to think of the faint "was it there or am I imagining it" signals as the ones that often put deep gold in the bag!!

I don't move the setting threshold once I am hearing the signal I am happy with.

I may try different gain settings, but usually end up in the one oclock to three oclock range.

I'm looking forward to trying the DF with pulse delay off, but winter is landing hard on the north east coast and it will be a while before I can wade in Long Island Sound again!!

My best wishes to you and yours for the Holiday Season,

CJ

 

[therover]

Wishing you the same to you and your family. I will be trying to hunt the NJ beaches all Winter long, but no wading for me ! Wet sanding it and hoping a few storms come by to erode some sand and expose some oldies.

 

[UK Brian]

You could find that performance will not improve as advancing the control helps minimize ground response by creating a longer period between shut-off and sample point. You have to balance with these cheaper pulse machines the loss of sensitivity to the most wanted metals as the control is advanced, against the fact the detector will cope better with the ground conditions if you do advance it.

The person who found he was doing better with the control in the off position must have been on none mineralised beaches similar to those in Florida. I've just come back from Italy where the control on the DF needed to be off to get down to the good finds but on to deal with the black sand. I switched to a Deepstar as I could use the adjustable SAT control to deal with the blacksand instead of the pulse delay.

 

[Cupajo]

Thanks Brian,

Another gap in my knowledge filled!

CJ