F75 LTD and Me, in My Dirt

[go-rebels]

My original set of batteries (one week old) has the problem and my brand new set of coppertops exhibits the same behavior. I even checked all eight batteries with a tester and they all measure @ 1.56V.

Thanks for the help D&P.

Arghhh...

 

[go-rebels]

This morning the unit works just fine! I just cycled it a dozen times on and off and it seems to be OK.

Now I'm concerned as I can't even send the unit in for a look-see if I can't find a problem today.

 

[BuckeyeBrad]

n/t

 

[go-rebels]

This thing has been in my 'dry as a bone' house for days. We know that EMI can very wildly during a day, and I was trying to power the unit up last night within my house, which has plenty of EMI all around. I wonder if that EMI prevented the LTD's internal computer from properly "booting up"?

 

[digitrich]

6) This is the shocker: As I decreased the sensitivity, from 50 to 30 in BP and 50 to 25 in CL, the background went totally quiet and the LTD rang out on all three dimes, including the elusive 8". The VDI bounced around with an occasional 70+ reading but the audio was clear in both modes. In addition, in CL @ SENS=25, I minimized the false iron tones on the repeat swing. Now 3 of 4 passes over the 8" time produced a nice strong high tone! I could also swing in CL at a respectable rate without missing he signal on any of my targets. ....end quote

That's some interesting and helpful info there, thank you. So from that, one would assume that with the new LTD hits better as you go for stability rather than pushing it. You could hover over an iffy and just start messing with the sensitivity until you got a cleaner signal and then hunt that general area at those settings. Should you get another iffy, try and change it again and so on.

Just got my LTD yesterday, my son's birthday today, so I can't hunt until tomorrow. I can't wait.

 

[BuckeyeBrad]

I noted this years ago on the very first really good site I hunted, and hunted, and hunted .....a good spot will produce using both strategies (high gain/low gain) alternately. In other words, hit it a time or two with as much power as you can stand and then go back and cover it several more times with lower stable settings. Don't worry how low it winds up being in order to be stable, just try it. Doing this the other way around is fine too, just so you try both. It can be a real eye opener what the low road can yield at the right site especially when you've hunted in the past thinking the only way is that you think you have to drive your detector like it's the %$#@ starship Enterprise and and you don't feel right until Scotty is always telling you "I'm givin' 'er all she's got!". This should be done using both concentrics and DD's sized for the needs of the site. The additional flexibility provided in the LTD's just helps the user capitalize better on doing both approaches.

 

[BuckeyeBrad]

It's just a guess. In a lot of the country, we've been having some repeated huge swings in temp and humidity recently. I know of two locals using two different brand/model detectors that have had similar strange behavior show up in their detectors just to be gone a day or so later. Coincidence?

 

[go-rebels]

It's just a guess. In a lot of the country, we've been having some repeated huge swings in temp and humidity recently. I know of two locals using two different brand/model detectors that have had similar strange behavior show up in their detectors just to be gone a day or so later. Coincidence?

Well, it's been 12hr since I powered the unit up this morning and just mounted the 6.5" concentric elliptical; everything is running just fine. I only had about 1/2hr test time and here are my results in my test bed over 6", 7" and 8" buried silver dimes:

DISC=0, Tone=4H

1) Mode=DE with slight chatter, SENS=70, 6' dime hits hard; 7" dime is invisible; 8" dime faintly hits 25% of the time.
2) Mode=JE with slight chatter, SENS=60, 6" dime hits hard; 7" dime hits faintly 25% of the time; 8" dime hits faintly 75% of the time.
3) Mode=BP with no chatter, SENS=45, 6" dime hits hard with VDI in the 80's and 90's; 7" dime hits with a one way response 75% of the time; 8" dime hits hard with a one way response the other direction giving an iron grunt.
4) Mode=CL with no chatter, SENS=35, 6" dime hits hard with VDI in the 90's; 7" dime hits hard with a one way response, VDI in the 90's; 8" dime hits hard with VDI 70's to 90's with a one way response (the other direction giving an iron grunt.)
5) Mode=CL with no chatter, SENS=35, DISC=40: 6" dime hits hard with VDI in the 90's; 7" dime hits hard with a one way response with the other direction silent, VDI in the 90's; 8" dime hits hard with VDI 70's to 90's with a one way response the other direction silent.
6) Mode=Motion all Metal (Boost), SENS=90, Threshold=+1, 6" dime hits hard with VDI=80; 7" & 8" dime give a very weak signal that I would not dig.

I must admit that I'm not comfortable in the All Metal mode as I can't find a setting that performs anywhere near the BP and CL DISC setting.

One thing is for certain, the CL mode is perfectable usable at low sensitivities, in my soil, for coin shooting! The audio is very clean and I really don't have to slow my sweep speed down to an uncomfortable degree.

Next: testing of the 5" DD.

 

[go-rebels]

Well, my LTD is officially dead! It will go back to First Texas tomorrow.

 

[go-rebels]

$31 to just ship the 'head' back Priority mail, Insured.

It would sure be NICE if it came back with a coil cover or t-shirt within the return box!

 

[marcomo]

$31 to just ship the 'head' back Priority mail, Insured.

It would sure be NICE if it came back with a coil cover or t-shirt within the return box!

I guess that would be nice, but keep in mind First Texas isn't getting any of that $31...

 

[BuckeyeBrad]

n/t

 

[freightdawg747]

n/t

 

[Cal_Cobra]

$31 to just ship the 'head' back Priority mail, Insured.

It would sure be NICE if it came back with a coil cover or t-shirt within the return box!

That's a bummer, FT should pick up the shipping both ways, I've seen many others state FT sent FedEx to their home to pick up RMA's.

 

[go-rebels]

I've made a few inquires at First Texas regarding my "dead" F75 LTD, and, as feared, they cannot see a problem yet.

*********

I need a favor of someone who has an F75 LTD...

Can someone put a metallic object under the coil of their LTD and turn on the machine? Does it start up OK?

Thanks in advance.

 

[D&P-OR]

go-rebels------Ask Fisher to keep your LTD & keep checking it till the problem you're describeing occurs.--Sometimes if a problem is intermittent, it's hard to locate.--They should be glad to do that for you (especially on a new machine like the F-75 LTD)--they offered to do that for me once with an issue I had with a detector.--Hope things work out for you, I know it "a bummer" to have to send a new detector in.--------Del

 

[go-rebels]

Yes, I call them nearly daily inquiring and asking them to cycle the detector ON---OFF at every opportunity. Fact is I could only get the unit to boot up correctly less than 25% of the time during that last day I had it, and I tried 20-30 times so they've just got to see the problem... at some time.

I usually turn the unit on in my basement then carry it outside. I'm wondering if the unit will not boot up properly if it initially sees metal under the coil. I don't remember ever trying to turn the unit on outdoors.

I can say for certain that my old 1st-gen F75 never had that issue.

 

[John(Tx)]

I have done the same thing with my F70. Whenever I run on SL mode, I cut the sens back to 40-45 and the F70 goes just about silent and very stable but the depth is still very much there. I have a 10" quarter in my test garden that my F70 will pick up in the DE mode with the sens at 80+ but in SL mode with the sens as low as 30 it will still pick it up, set it up to 40 and it is very loud. Don't know if this is normal on all F70's but I am very happy with mine. I had even thought about selling it at one time because of the unstability but while playing with the settings and cutting the sens, getting it very stable and still going that deep, I have no plans of selling anymore. Thought I'd share what you guys have already found out. Good hunting to all. John

 

[go-rebels]

Yes, I call them nearly daily inquiring and asking them to cycle the detector ON---OFF at every opportunity. Fact is I could only get the unit to boot up correctly less than 25% of the time during that last day I had it, and I tried 20-30 times so they've just got to see the problem... at some time.

I usually turn the unit on in my basement then carry it outside. I'm wondering if the unit will not boot up properly if it initially sees metal under the coil. I don't remember ever trying to turn the unit on outdoors.

I can say for certain that my old 1st-gen F75 never had that issue.

Called Fisher again yesterday and they have decided to send me back a new unit (head only). Unfortunately, they were never able to repeat my problem so I agreed with Felix to call him after a few days to let him know how the new unit is performing. In retrospect, I should have taken a picture of the blank, lit display screen when the unit was in a dark room... oh well.

Both Felix and Sal (my Tech) were very professional in this incident.

 

[D&P-OR]

Glad to hear it worked out for you my friend.--Enjoy your new unit & let us know how this one does for you.--Haven't had any problems with my LTD-in fact the wife likes it so well she has just about taken it away from me. -------Del