Fisher Impulse AQ (formerly Aqua Manta) Pulse Induction Metal Detector
By Steve Herschbach
I will be using my Impulse with the battery end well out of the water while shallow wading or on the beach, etc. I wanted to get away from wired phones and save the waterproof phones for when I actually need to submerge the machine. No sense putting any more wear and tear on the cable than I need to.
So I found a source of relatively inexpensive M8 pigtails and cables, AutomationDirect. Never ordered from them before, but it was easy and cables arrived in two days. I got two pigtails for the headphone 5-pin connector, one straight, and one 90 degree. And I ordered a couple longer 4-pin cables for the power connection, to work with a high capacity power pack I have on order. More on that later when it arrives.
I decided to use the 90 degree cable to make an adapter for my new TaoTronics transmitter/receiver box so I can use my Minelab phones, which I like, with all my detectors. There is also a less expensive transmitter only version.
M8 5 pin 90 degree pigtail
I dug through my pile of adapters and found a spare mono 1/8" extension cable and cut it off, saving the female end for this project. The TaoTronics comes with a RCA to 1/8” female cable that would also probably work for this. I hooked up the 90 degree cable and powered up the Impulse. I randomly hooked up the two wires from the 1/8" socket to the five while having some stereo earbuds plugged in, and found that the brown and gray wires gave me audio in both ears. According to the chart below brown is #1 and gray is #5. I wanted to make very sure there was audio in both ears using the mono socket but with stereo phones plugged in, so good to go there.
I cut the cable down short, spliced and covered with shrink tube, and wrapped a little electrical tape on to add some beef. Not pretty but it will work - a typical Herschbach job. I bent the cable under the armrest, and added a stick on square of Velcro to back of the TaoTronics transmitter and the leg stand. I'll add more squares to my other detectors so I can move this transmitter around to whatever I am using. A little tie wrap secures things.
Fired it up, paired easily with my Equinox 800 headphones, better audio than the Fisher phones, and frankly the Equinox phones are not the best in that regard. Cheap, super easy... I'm quite pleased with this. I can of course use 1/8" type wired phones or ear buds if I want. I'll make another adapter with the straight connector but go to 1/4" with it, so I can use my Sun Ray Pro Gold headphones without an extra adapter. I'll probably make that cable a little longer than this one, which I wanted as short as possible.
If you got the TaoTronics transmitter only box for $20 and this cable for $8.50... well, this is pretty cheap and easy, and will work with a huge number of headphone options.
Ironically my new Tarsacci MDT 8000 comes with am M8 to 1/8" adapter with one little problem. Fisher uses a 4-pin connector for the power/headphone combo cable, but then for some reason they use a 5-pin M8 for the headphone only connector. The MDT 8000 headphone adapter is of course 4-pin. I swear they must all have secret meetings to make sure nothing from one detector ever works with another.
Click or double click photo for high res version.
AutomationDirect M8 Cable Specs pdf
By The Seeker
I have no idea where to start since most of the things I saw have been said already. I have done only two hunts so far. My first hunt was 2.5 hrs and my second one (today) was about 3.5hrs.
Every new detector I get I start from scratch like a new detectorist and just learn it as I go. My first hunt was not good at all since I dug a lot of iron and less than a dollar in coinage. My settings were all metal, ats 0 , sensitivity 8-9, volume/threshold 4. With these settings I was digging anything I heard in the wet and the holes I was making were just too deep so when the 1st battery died I followed suit and called it quits. While swinging I noticed I was getting quite a bit of noise/falsing and I don’t know if it was because I was running it hot.
My hunt today was a little better and I managed to pull some decent targets. Setting this time were all metal, ats 2, sensitivity 7, volume/threshold 4. The AQ ran way better, no falsing unless I was running parallel to the water on a slope. Even with the falsing running parallel I managed to hear the small yellow ring and the big gray tungsten. The yellow ring was quite deep too.
Today’s hunt I wasn’t 100% into it due to the beach closures going on in Socal. I read online that the beach I went to was supposed to be open today but when I got there it said it was closed. I drove a long way to get there so I wasn’t going to drive back without giving it a try. Luckily during my time there nobody came by to kick me out. There were a handful of people at the beach so that helped some I guess. I am very pleased with the performance/outcome and I’m sure with a little practice things will only get better.
The pictures below are from all the targets I recovered today. The fishing lure was an eyeball find. HH
I received my AQ 1-1/2 weeks ago and have been out with it twice so far, my first hunt was last week Sunday for a combined 5.5 hours between 2 batteries (I purchased an extra battery). I hunted at a beach where I detected the previous weekend with my TDI BH so didn't expect much as far as finds but just wanted to get a feel for the new detector, I hunted in the water from shoreline to chest deep with the AQ in all metal mode and presets on the rest of the knobs except for the pulse delay which I tried out from 7 - 11.5. Running with the pulse delay at 7 was a bit noisy especially when swinging the coil away from the shoreline into deeper water but was actually quite stable with minimal falsing on the return swing toward shore, increasing the pulse delay resulted in as expected less falsing/chatter, I ended up at 10 microseconds. I was able to find a bit of change, fishing lead, tent spikes and a stainless steel ring I estimate was dug in the 10" range.
My second hunt was yesterday in Waikiki in the bigger of the 2 ponds for those familiar with Waikiki, again strictly in the water and in all metal mode but was able to run the pulse delay at the marked preset 8 with minimal falsing, found some change, pull tabs and a titanium ring. My battery lasted 2 hours 40 minutes which was 10 minutes longer than its first run last weekend, I opted not to swap batteries to hunt longer as the tide was really coming up and ended up calling it a day. As mentioned I also detect with a TDI BH and find the AQ to be very similar so far in performance and audio but again have only 8 hours of detecting time with the AQ water hunting, I have yet to try any dry/wet sand hunting and modes other than all metal. In the pic are the SS and titanium rings, hopefully some precious metals are right around the corner.:)
Physical observations - The AQ seems well built quality wise and feels well balanced, I find it easy to swing in the water even with its 12" coil. I'm 6'1" tall and am okay so far with the stock rod length fully extended - I can see where hunting the wet/dry sand a longer rod would give a wider swath while hunting. Others have mentioned the arm strap being short, the strap that came with my AQ seems fine too me. I also secured the headphone cable to the top of the detector shaft with a small Velcro strap as a strain relief as suggested by OBN and others.
Tried a dry sand hunt today with the Impulse AQ. Being the 4th of July, the beaches were PACKED! Started with plan A, went to plan B, but, ultimately ended up with plan F. Ended up on a bay beach where in the past, I've found a little jewelry, a few older (40's up) coins, and LOTS of trash. This is definitely one of the trashiest beaches in my area. I'm not sure the name of this beach, or it it even has one, but, I call it "Nail and Nugget Beach" for the slew of nails and melted aluminum can "nuggets" that are all over the place. Probably not a great place to try out a new PI machine, but, one of the few places I could get to today and actually find parking. I tried hunting in all metal, but, that lasted maybe two minutes when the realization of the site hit my ears. In all metal, I wouldn't leave a 10 foot square area. Ok, tone then. Not much better, but, a little. Time for some testing. I brought with me some of the iron junk I had found on my first adventure with the AQ. On the surface, I could actually get the discrimination to work pretty good on rusty nails if I put the reject control to at least 8. It would sometimes work at 7, but, 8 seemed pretty consistent. That was with the ATS at the preset. I also tried the ATS at both ends of it's range, but, it didn't seem to make any difference, so, I kept it at 8 for the first hour or so. Well, it did I.D. some iron, but, not all for sure. It seemed the wetter the sand, the better the discriminator worked, but, it wasn't anywhere near 100% accurate. 50% at best, and that was just real rusty nails. No way could I find a setting that would keep me from digging bottle caps or hair pins. I ran ATS and Reject from one extreme to the other and everywhere in between and couldn't find anywhere it would give any hint of a low tone. Both those items rang loud and clear with a high tone regardless of depth.....and some were very deep. I then settled on putting the reject knob on 10 to maybe help with them and the iron. Hunting around the fire rings was impossible. Just too many targets ringing in your ears. I dug a lot of low tone and mixed tone targets just to get a feel for what the machine was telling me. Most of the time it was telling me there was a good target there, but, alas, most of the time, it lied. Lots of false positives, but, I didn't get any false negatives. If it said it was bad, (or at least had a low tone in there somewhere), nothing good came out of the sand. Good targets, if you can call them that, sounded good, with no iron low tone mixed in. These were the 4 nickels I found, along with the butter knife and other "normal" items in that range. This includes the foil, slaw, and pull tabs too, unfortunately. Too many times the iron sounded just as good though. I also ran the sensitivity up and down in my testing, and found it affected the depth quite a bit, but, not the discrimination, which I expected. So far, this machine IMO is a great beep and dig machine if you need depth. If you're looking for good discrimination, forget it. It's not nearly reliable enough in my book, at least, not yet. I'll give it many more outings at various beaches before I come to any firm conclusions. I plan on hitting another beach at a minus tide early tomorrow morning at a beach that's a whole lot cleaner, so, we'll see. This outing lasted 2 hours and 45 minutes before the battery died. At least that's headed in the right direction from the 2 1/2 hour episode the first time out. Here's the take for the day.
By Joe Beechnut OBN
Out with the AQ Thursday 3 hours....... Skipping shallows and digging faints only at this location seems to be the best way to control the amount of trash. The one big piece of iron I did dig was shallow... The Buffalo, (191?) was as deep as I've dug in the place for anything, I would say in the 20 inch range.... It sure likes Nickels...And remember I hunt in All metal only..never switched over to mute this time..straight PI hunt only........... Gold ring is small, just under 2 grams 14k , 3 scoops deep..maybe in the 13 /14 inch range.. Ring never really gave a good solid hit so maybe it was on it's side? 10 gold with the AQ, 9 rings and 1 misc..Can't wait till fall hits and the NW winds kick in...☠️
Side note, This is the beach I'm so confident about the AQ being the best I had invited anyone that want to meet, over on the other forum. So far no local takers but did get a few from a distant that wanted to give it a go. Anyone is welcome.......... A very tough spot, Been hammered for years by just about ever machine made. Been dredged, mined, and Has High Power lines about 100 yards away. And if you noticed in the video I'm wearing a drysuit with dry gloves, during the summer. Water quality is not the best either so playing it safe. Merritt Park in Baltimore Maryland..Still waiting for the Cygnus invite challenge also...nothing yet. Let me know, the door is open..
Second set of pictures are from the batteries I'm working on..should have something working mid July, still waiting on a few detail things. The main thing is battery life and fix the connector issues.
I really could do a much better battery setup if I were to change the shaft to a carbon fiber then mold a carbon fiber battery pack into the rear like the MDT...