Fisher Impulse AQ (formerly Aqua Manta) Pulse Induction Metal Detector
By The Seeker
This was my 3rd and last hunt. I went out for a low tide hunt and I was the only one at the beach. I think it’s mostly because people are going at night and leaving when the sun goes up.
Things were looking good, I was pulling the correct targets that should lead to some gold. Within 1.5 hrs I had pulled the 5 rings and ear ring. I continued hunting but the next half hour I wasn’t getting any targets anymore so I decided to throw a nickel on the ground. I was running all metal and max sensitivity. I ran the coil about an inch from the nickel and I could hear it but not that strong. I decided to start raising the coil and kept swinging until I couldn’t hear it anymore. At about 8-9 inches I couldn’t hear the nickel anymore. The battery was still good but I decided to try my backup that was fully charged. I got the same results on the wet and dry with the fully charged battery. I have no idea what happened with the AQ after only 3 hunts but I did noticed the back of the control pod was rather warm. I don’t know if it was warm because this is a high powered detector or some other reason.
P I shot an email to Rick which he forwarded to Fisher and I got a call back within two hours. I spoke to Felix and he sent me a shipping label so the detector is heading back to FT. I am bummed that this happened specially when I was on a roll but sh*t happens. I hope they are able to figured out what happened quickly so that I can get back to swinging and learning it some more. Good luck out there, HH. The 3 rings and ear ring are silver. The other two rings, one is tungsten and the other is junk. When I was about to dig the junk ring in my head I was like this is a big ring, pulled it out and I’m like 🤯 The pictures show all the targets I dug this hunt.
By Joe Beechnut OBN
Above being said.................. the one problem I have with the "AQ" it's audio blasts when I move the detector to the side to dig and there is another shallow target under/near the coil........ I mean it is loud, and since I use the head phones I make (skullies) which the DB rating (sound level) is 15 plus over anything out there..............I get blasted if the "AQ" comes near the scoop, moving it a side to dig.... hitting another target..Or the AQ going back into the water......Not complaining, just one of my things that I've not seen anyone else talk of.... that I can fix..while I am making a battery for it.
IP68, Bulgin On/Off...
Joe, are you using a bms module inside the 4s1p tube?I hope not because....
I actually don't know if I'm correct but seems to be the easier combination for a self balanced recharge without the need of multiple solder and little cables around cells, not to mention the module itself presence inside the pod...
I'm developing a similar pack for the Tdi and can be the base for the future of my dreamed AQ...
So I wanted to go back to my favorite beach since this time I would hit it at low tide. Not a great low tide, but enough to expose a good stretch of wet sand where I am dying to try the Tone (and Mute) modes where there is a decent amount of iron present. Today was not that day. Completely sanded in so I will have to wait until this beach gets ripped up a bit. It does not help that they groom the beach every morning. Last time the grooming guy came out of his way to circle me, trying to intimidate me into leaving I heard almost no iron, so I knew it was deeply hidden. 2 1/2 hours flies by and I'll probably have to wait until my good season hits this fall. I guess I'll have to cough up some cash and buy that Xtreme scoop so I can maybe hit some lakes with it. I'm not strong enough to handle those rough waves at these exposed beaches like you veteran water guys are The surfing dudes will be scraping me up out of the water. I'm not disappointed in the machine, just in the beach conditions and of course the short time allowable to hunt.
By Steve Herschbach
First off, I want to point out that what I am about to describe is not uncommon with high power detectors that have a coil that can be disconnected. The only way to really eliminate the problem is to hard wire the coil, which is another reason for why this option is chosen by so many manufacturers of underwater metal detectors. The White's TDI Beachhunter is a good example. The problem has its root in coil capacitance and the high voltages involved, and the difficulty of getting good shielding using a removable connector.
If the Impulse AQ is submerged halfway, so that the water level is anywhere in roughly the area indicated in the photo below, you will get continuous false signals. Just holding the unit stationary in the water at this level will cause signals as the water moves around the connection area. If you are not aware of what is happening it is every easy to mistake this for electromagnetic interference (EMI).
The problem is worst in the Tones mode, which I just happen to be using a lot. It is accentuated by a short pulse delay, high sensitivity settings, and low ATS settings. If you want to reduce the false signals, here are some solutions:
Use the All Metal or Volcanic modes instead of Tones Increase the Pulse Delay to 9 or higher Reduce the Sensitivity to 4 or lower Increase the ATS to 8 or above Or some combination of the above.
In practice this only occurs when wading, and only at a certain depth. My solution was simply to stay either deeper or shallower. This does leave a strip or area unhunted. You can either switch the settings as suggested above, or do something to change the height. Like hunt that strip with mask and snorkel, for instance.
Anyway, hopefully this is put in the manual as it is something inherent in the operation of the detector, and can drive you nuts if you run into it and do not know what is going on. It took me several hours of detecting to put two and two together, and it was then confirmed that yes, that is the way it is.