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Thread: Fisher F-Pulse important finding

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  1. #1
    us
    Garik Fox

    May 2019
    Queen Creek, AZ
    EQUINOX 800, GM1000
    14
    11 times
    Metal Detecting

    Fisher F-Pulse important finding

    Hello everyone, i just bought a F-Pulse and want to share some important findings.

    Alkaline AA (Panasonic Platinum Power)= Sens-3, works perfect.

    Lithium AA (Energizer Lithium Ultimate) = Sens-3, noisy on everything even holding in mid air.

    Hope this helps someone because i've been reading about people thinking there pointer is broken.
    Last edited by garikfox; Jul 10, 2019 at 01:31 PM.

  2. #2
    Charter Member
    us
    Oct 2014
    Massachusetts
    Garrett: AT Pro, AT Gold & Infinium; Minelab: Explorer SE, II & X-terra 705; Tesoro: Tejon & Outlaw; White's: V3i & DFX
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    I checked some of the unloaded voltage values of the Energizer Lithium on my test bench and all were 1.7 volts. Although a bit high, this shouldn't cause much, if any trouble. Interesting problem, I will have to look into the chemistry of the two battery types when time permits.
    Toecutter and garikfox like this.

  3. #3

    Apr 2012
    Tupelo, Ms
    Fisher F2 w3coils - Teknetics T 2 Classic w NEL Sharpshooter coil - Whites TRX pinpointer
    108
    139 times
    All Types Of Treasure Hunting
    Don't take this as a slam against Fisher. I have a F5 and a T2 that I just love.I was going to buy a Tech point when it first came out but it looked like there was some start up problems. Now I read this post and it looks like it is temperamental to batteries. I have a Whites TRX that works fine with any battery I put in it. Looks like Fisher still doesn't have it right. Not a slam just a oplnion.
    chub likes this.

  4. #4
    Charter Member
    us
    Only boaring people get board

    Nov 2018
    The Thumb
    Mine Lab Equinox 800, Mine Lab Pro Find 35, Garrett Pro Pointer 2, Whites ID5 Classic
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    All Types Of Treasure Hunting
    Voltage and discharge rate, between the 2 types of batteries would be my guess as the lithium's may have a higher discharge rate along with the voltage being higher....

    alot of electronics dont recommend lithium's.....
    I'll sleep when I'm dead

  5. #5
    us
    Deep1

    Dec 2018
    Carolina Lowcountry
    Nox 800, Garrett Sea Hunter Mark II, Poor ole wore out Fisher 1266 that still finds stuff.
    199
    475 times
    All Types Of Treasure Hunting
    Pulse induction is not voltage regulated like a VLF.
    The more voltage put into PI the stronger transmit signal.
    I would like to see the results of an air test, using alkaline at sens 3 and lithium at sens 2.
    With the extra voltage, you might be getting the same depth with lower setting and lithium.
    Toecutter likes this.
    If it's old, I'll dig it, dive on it, detect it or sometimes when I get lucky just bend over and pick it up.

  6. #6
    Charter Member
    us
    Nov 2012
    Maryland
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    Something I hadn't heard of before. Interesting.

  7. #7
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
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    The Tek-point/F-pulse transmitter is driven from a step-up regulator, not directly from the battery. So running a higher voltage won't help.

    That very step-up regulator has a problem when driven with more than about 3.4V, and causes falsing. So it works fine with alkalines but not lithiums.
    mh9162013, Deep1, UncleTom and 3 others like this.
    I believe it, therefore it is true.

  8. #8
    us
    Jan 2007
    Gold Canyon AZ
    ML SDC-2300, Fisher F-75, XP Deus,
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    All Types Of Treasure Hunting
    Nice to have the Chief Engineer around to answer the question!
    fishstick likes this.

  9. #9
    us
    Jul 2010
    677
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    Quote Originally Posted by Carl-NC View Post
    The Tek-point/F-pulse transmitter is driven from a step-up regulator, not directly from the battery. So running a higher voltage won't help.

    That very step-up regulator has a problem when driven with more than about 3.4V, and causes falsing. So it works fine with alkalines but not lithiums.
    Wouldn't a last stage ballast resistor have rectified this?

  10. #10
    us
    Feb 2014
    Ohio and Florida
    CTX3030 w 11" and 17" DD coils, Minelab Excalibur II w 10" coil, Equinox 800 w 11" and 15" coils, Troy Shadow x2 w 7" coil, Pro Find 35 Pointer Vibra-Tector 730 w 4" coil, Fisher F-Pulse Pointer
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    Honorable Mentions (1)
    Quote Originally Posted by garikfox View Post
    Hello everyone, i just bought a F-Pulse and want to share some important findings.

    Alkaline AA (Panasonic Platinum Power)= Sens-3, works perfect.

    Lithium AA (Energizer Lithium Ultimate) = Sens-3, noisy on everything even holding in mid air.

    Hope this helps someone because i've been reading about people thinking there pointer is broken.

    I just sent my second F-Pulse in for repair/replacement and they can keep it as far as I care. [Nothing to do w batteries.] The first died after a month, would not turn-off. The second started doing the same thing, not able to turn-off, but it is an intermittent problem. May work fine for a week than go bonkers and not be able to turn off except, as a last resort, by removing the battery. This is one of the most frustrating things to happen in the field - what do you do with a pointer that won't turn-off in the middle of a hunt? I even sent Fisher a video of the unit failing to turning off. Just heard back from Fisher and they're trying to say the problem is how I'm pressing the button - they're fu**** nuts and just looking for an excuse other than that the F-Pulse pointer is a real LEMON. DO NOT BUY THIS POINTER!!! You will be sorry. Really sorry to hear that you bought one. Please let us know when yours decides not to turn off...I'm betting 2-3 months.
    chub likes this.
    Metal Detecting Goal in Life is to Find Wife a 2ct Diamond Ring (so she'll be quiet about all my metal detecting).

  11. #11
    us
    Garik Fox

    May 2019
    Queen Creek, AZ
    EQUINOX 800, GM1000
    14
    11 times
    Metal Detecting
    I actually sent mine back because of this odd voltage behavior, I should've done more testing with the lithium and sensitivity levels.

  12. #12
    ca
    Hawks88

    Aug 2012
    Niagara falls
    Equinox 600, fisher gold bug pro.
    7,052
    9602 times
    All Types Of Treasure Hunting
    Interesting. Thanks for that.

  13. #13

    Apr 2017
    Fisher F75, Minelab Soveriegn XS 2 Nokta pinpointer
    944
    1293 times
    All Types Of Treasure Hunting
    Quote Originally Posted by LawrencetheMDer View Post

    I just sent my second F-Pulse in for repair/replacement and they can keep it as far as I care. [Nothing to do w batteries.] The first died after a month, would not turn-off. The second started doing the same thing, not able to turn-off, but it is an intermittent problem. May work fine for a week than go bonkers and not be able to turn off except, as a last resort, by removing the battery. This is one of the most frustrating things to happen in the field - what do you do with a pointer that won't turn-off in the middle of a hunt? I even sent Fisher a video of the unit failing to turning off. Just heard back from Fisher and they're trying to say the problem is how I'm pressing the button - they're fu**** nuts and just looking for an excuse other than that the F-Pulse pointer is a real LEMON. DO NOT BUY THIS POINTER!!! You will be sorry. Really sorry to hear that you bought one. Please let us know when yours decides not to turn off...I'm betting 2-3 months.
    I like Fisher but it sounds a bit like they are taking shortcuts with the product testing. I remember the F22/ 44 being released with flawed push buttons etc.

    Chub

  14. #14
    us
    Garik Fox

    May 2019
    Queen Creek, AZ
    EQUINOX 800, GM1000
    14
    11 times
    Metal Detecting
    If someone else has a F-Pulse that can confirm using energizer lithium ultimate batteries results in extra sensitivity, would be interesting to see if this happens to all of them. I'm assuming all units display this voltage behavior.

 

 

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