Jump to content

Recommended Posts

Hello Guys,

I'm new on this forum and like Alexandre Tartar, I live in north of France.

I was a young prospector in the 90's and asked my father (electronic engineer with good knowledge in magnetic field theory) to build a PI to hunt the beaches. So we have made, in a few months, an home-made PI metal detector 25 years ago, based on the technology of the old White's Surfmaster PI (mono coil). I remember the use of FETs (Field Effects Transistors to make 200 volts pulses). It worked, but unfortunately, my father was afraid by a so powerful magnetic fields and has continued his research on VLF detectors, until today !

After this short presentation, here's my question :

Is the Impulse AQ a bipolar detector ?

Le Jag has explained us on the french forum "detecteur.net"  this technology developped by Alexandre :

Positive and Negative pulse are alternatively sent.

The positive one light the gold ring but magnetize the soil.

The negative one demagnetize the soil.

What about it ?


Link to post
Share on other sites

Subject of course, to correction by Alexandre, The short answer is no, the AQ is not bi-polar. Alexandre has developed bi-polar platforms, but not at this time for the AQ. 

Link to post
Share on other sites

I will bet a sizable Mexican dinner at La Casita in Globe Arizona that “VE” has nothing to worry about on the possibility of a bi-polar AQ version shortly after AQ going on sale. Fisher is the Tortoise in the fable of the Hare and the Tortoise vs. Alexandre who is the Hare (and a speedy bunny he is indeed!)

If you wait for the BP version, I hope your beaches aren’t visited by too many AQ owners! Lol 

  • Like 1
Link to post
Share on other sites

Hi Rick , if I understood well, you are the owner of an AQ , did you do some tests with it ?

thx , Alain

Link to post
Share on other sites

Damned ! No chance to see a Fisher Bipolar PI detector on the market until 2032.

...Indeed, my father just sent me the White's US patent 20110316541A1

You can read it at this link (pdf file) :


(...) Consecutive truncated half sines of current are of opposite polarity as efficiency is enhanced by the bipolar resonance proceeding past the peak of current, providing bipolar waves allowing for earth magnetic field cancellation with as little as one sample of both polarities during the pulse mode sampling time following the truncated half sines of current. (...)


Link to post
Share on other sites

Nice try JEKO - but no cigar for you. The patent is for using half sine current to produce the bipolar response. There are lots of ways to generate a bipolar signal - Minelab’s mine detectors and probably others do it already without infringing the Whites patent.

  • Like 1
Link to post
Share on other sites

That half sine patent has been discussed here as far back as six years ago and still no product in sight. Various prototypes have been developed at White’s over the ensuing years, but so far getting something to work well enough to bring to market has obviously not happened. I keep hoping for a surprise out of left field from White’s based on this patent that somehow turns the market upside down. White’s certainly needs a real winner at this point if they want to remain relevant. The truth is however many patents and great ideas just don’t work out in the real world. The Fisher CZX/Mosca was just one of many, and the Pulse Devil an even better example of a great idea that never happened. An ironic name in retrospect. The devil is, as they say, in the details. :smile:


  • Like 7
Link to post
Share on other sites

Thank for your answers and for the link ! 😉

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Similar Content

    • By Joe Beechnut OBN
      Got in 4 hours Tuesday AM, started out with rough water but by 11 am things were calming down. Took me about 30 minutes of messing with the controls before I got it to run stable and under control, then I slowly adjusted the setting as the water calmed. Started out with the settings ....delay 11.5 (15) Sensitivity 6, ATS 8, All metal , volume I ran high the whole time with the threshold just audible.. ( The settings that really seem to calm the AQ in rough water is the delay and ATS ) And by end of day I cut the delay down to 11, sensitivity 4, ATS 6, all metal, volume 9, and threshold 4/5 just audible.  It was purring like a kitten. Dug a lot of nickels, no silver coins, one nickel / silver ring (my first marked that) and one 1.5 gram 10k..
      This spot I have passed thru with the excalibur a few times of late, I've yet to find targets the way the AQ does. Shallow targets here are trash so I keep on walking on those..I only dig faints here...and the ring was maybe 12/14 inch's? The AQ loves the small gold rings.  
      First time out this year with the drysuit, It was 60 degrees with winds early am. I hate being cold...Plus on one of the other forums some one posted about some flesh eat bacteria and I had cuts on me from working in the yard Monday so best to be safe. All worked out good and glad I went that route.
      Video of..........cam has been on the blink of late, I think the problem is moisture inside of the Go Pro. As you can tell by the frosty video. I checked to see if i got the gold ring on video, it did, then I stopped the recording..... then it would not restart. Once home I checked and it started to work again. I just dropped it in a bag of rice to see if that will draw some of the moisture out.

    • By Tony
      I’m sure I read somewhere that all of these common connectors (typically for headphones) such as the 8 pin style have a limited amount of mating cycles. Connector integrity cannot be assured after this. I guess there is a small amount of wear and tear on the male/female metal contact points as well as the plastic/rubber moulding that keeps water out.
      Any views on this? 
    • By Carolina
      Just a short note on Joe’s “shorty” AQ battery. It fits well under the cuff and balance was not noticeably effected from the lighter than stock battery. Run time for me in “tone mode” was 6 hours 20 minutes. It is my understanding that in all metal it is approximately one hour less. The M12 (CTX) phones connector was a welcomed change and the power cable with a small loop and ninety degree connector also worked well. Get one of his battery set ups and avoid changing batteries in mid hunt, while they are available. I believe he has other set ups with even longer run times. Knocked it out of the park again Joe, thanks.

    • By schoolofhardNox
      Finally I  was able to get to a beach after their season ended. I used the AQ in all metal and mute modes. I could not use the tone mode since I was way too close to the Acela high speed train. Most of the trains that run that rail don't affect my pulse machines too much, but when the Acela hits the rails, it's a no go for any machine. The AQ handled it a bit better than my GPX does. But you still have to hear the interference and at times you just can't hunt. I hunted for 5 1/2 hours with the AQ  (2 3/4 hrs per each battery). The low tide was exceptionally "high" at +0.9. This did not allow me to get much wet sand, so most of the hunt is in dry sand and any wet sand I could find. This is just the first part of the hunt involving the AQ. I hunted another 3 1/2 hours with the GPX not shown here.  I have a lot to learn, so I am digging every target. I am getting better at knowing hair pins, as I could call most of them before I dug them. Bottle caps are a different story, as the only idea they might be bottle caps was the extremely strong and wider signal. But I think a gold ring a 2" would sound the same? I should be able to get out again soon and hit a very good low tide, so I will have better information on how I do in the iron and wet sand. I did manage to get a small silver ring, some bling jewelry and a lot of exercise! Settings were Carolina's settings. Thanks man! I ran at 7.5us most of the time. I still like how the AQ responds and feels generally. Only real drawback is swapping out a battery making sure no sand gets into the connections. For those that have way more experience on the AQ than I do, have you found the depth on dry sand to be equal or less than wet sand?

    • By GB_Amateur
      Out with the Minelab Equinox yesterday and getting frustrated with the difficulty of switching to the user 'profile' (plenty of complaints on that since its release) but then wondering why we have only one memory slot.  Sure, many detectors have zero....
      Are there detectors on the market (or even from the past -- no longer manufacturered) that have more than one user memory slot?  It's hard to believe in 2020 with gigabytes of memory in so many small packages/products that we can't have 2 or (am I asking for too much?) 4 places to put user custom set search modes.
    • By Joe Beechnut OBN
      Small gold ring from Last Friday using the AQ....Got 2 more gold Saturday but they were at a different beach and the excalibur. I'll post them later this week. Hit a bump in the road Sunday night, had to take a family member to the hospital ..she was in for few days and came home today... Thank God..all went very well. 
      I was out twice last week with the shorty battery and it is now packed up and ready to go a few rounds with my friend Carolina...Give him a week with it and see what he has to say...I want his confirmation on the run time of 5 hours and 30 minutes and see if I need to make any adjustments...before I sell a few. Got rid of the m-8 headphone fitting and the battery is fitted with a M-12 8 pin CTX head phone fitting..(Very Common) and replaced the M-8 4 pin on the battery with a 90 degree molded cable that goes right to the end of the white shaft 4 pin power/headphone plug...So we got it down to One M-8 fitting..which the 90 degree is a Bulgin molded SS fitting..so it does not stick out like the stock...

  • Create New...