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Who is your phone contact at First Texas if you want to discuss anything regarding the AQ you own? Edit: never mind, I finally got Felix by asking for "service". He explained there is no warranty carryover - which I expected. Let me know if any of you open this thing up (take photos!). I fully expect to maintain this all on my own if I can.

Has anyone had their control pod come lose on this detector? Pressed my thumb aganst the panel and noitced that it was moving and not secured. Doesen't seem to be any obvious fix although there's a screw visible at the side of the handle when you roll the foam down. Still works but only an impact away from disaster... cjc

Turned it on and All Metal mode was dead, Tone mode works, 12.5” coil. Tried8” coil and it works on both. Will show video later. Looked at connector pins and see some loose ones. Is this ok?

Curious if anyone knows the out of warranty repair cost for the AQ. As they probably just toss it (hermetically sealed) there likely is just one cost… I’m wondering how they test the delay settings function as I haven’t been able to see much difference and another user I talked with expressed the same opinion.

A reference collection of threads about the Fisher Impulse AQ, grouped into rough categories. Fisher Impulse AQ Limited Launch & Buyers Disclosure Fisher Impulse AQ Ltd Owner's Manual Official Impulse AQ Limited Color Flyer Official Facebook & Website Links Fisher Impulse AQ Ltd Data & Reviews Fisher Impulse AQ Data & Reviews Fisher Impulse Gold Data & Reviews Genuine Fisher AQ Ltd Spare Battery Part Number & Price Fisher Impulse AQ Rod Length Measurements Impulse AQ Rod Extension False Signals From Coil Connector Fisher Impulse AQ Discrimination Explanation Impulse AQ Audio Responses Impulse Tones & Discrimination Notes Impulse AQ and "No Holes" Impulse AQ and Mineralization Fisher Impulse Small Gold Sensitivity Impulse AQ First Field Report Homemade Batteries For Impulse AQ More On Homemade Batteries Homemade Headphone Dongle / Add Wireless How To Relax The Headphone Cable Fisher Impulse AQ - The Next Version Quick Link To ALL Impulse Threads - Latest User Reviews and Reports Fisher Impulse AQ Calibration Information

Do you guys experience a big difference in target response for delay settings? I’m trying to see if mine has an issue as on small air targets I just don’t see much difference with delay variation. It might have a loose wire to it. I tried an earring back and a 5 grain gold nugget. When using it for EMI optimization I do notice changes as I rotate it but I can’t say if the resulting behavior is optimized or not in normal modes.

Today I noticed on an air test I don’t here a faint target on the perimeter of the coil. I here a faint target in the center of the coil where it attaches to the lower rod. when it’s a surface target(loud target) I here it on the outside perimeter of the coil. is this normal. how do you guys have your coil cable coming off the coil to the lower rod. is it tight (straight) or do you have slack. I am trying to understand and learn this machine. But I still have not gotten a good deep target over a foot. Today I used the whites tdi pulse scan and got a deep target. Had to remove 2-3 inches of sand before the AQ herd it it was a clad nickel. Depth unknown guess 12-14 in

There are lots of notes on this thread about changes that are being made in the next version of the Impulse AQ. Key items: Battery system replaced entirely with four drop in 18650 rechargeable Li-Ion batteries Depth rating to be increased Lower rod made longer to accommodate taller users Headphone connection being relocated to back of pod An 8” accessory coil is in the works Refer to the thread above for details.

On my first full week's salt water hunt with a working AQ and Im quite impressed with what this machine can do. I've always been a proponent of the "sifting" approach to gold hunting--that is --starting with being able to accurately separate ferrous from non-ferrous. The AQ does this quite well and hunting in an environment with lots of rusted out coins and iron shards its an effective weapon for alerting you to anything not pure iron. Still working on the tuning but overall this detector will stabilize in salt and still perform. What's needed is an awareness of when to turn it down. (Sens / Delay / ATS up)--what the conditions demand. I got one deep ring walking across an incline--a tuning challenge for any detector. Thought there was something wrong with the machine at one point then realized that it was responding poorly the the bleached out nickel tester I was using. I've sealed my power jack and coil connector with CoAxSeal to be on the safe side. Maybe not the detector for anyone new to pulse induction but for someone who is willing to take the time and learn some basics (signal selection especially) this is a powerful, smooth running pulse that will do a great job on gold. cjc

Getting ready to ramp up......what’s better than a AQ...... hmmmmm ....Two AQ’s Happy Trails jimpugh

I was curious to see if anyone would buy an AQ Limited if Fisher made it available or would you wait and hope for a Unlimited model to finally be produced? My thoughts are: If Fisher offers the Limited, I would be a buyer because I fear that the Unlimited version may never see the light of day. Watching OBN and Carolina produce with the AQ is a pleasure to see and a two year warrantee should take care of out of the box hiccups. My only fear about buying an AQ Limited is that Kellyco was correct when they stated that the AQ finished product would be released in 2022. What are your thoughts?

I am noticing that sometimes the AQ makes a dominant tone on each swing at the wet of the beach. I’m not able to reduce it- unless it reduces depending on the EMI setting chosen (I didn’t spend a long time testing this)... I had a long hunt today - 3 beaches 10am to 3pm. I was running on OBN’s short battery. Later in the day I was able to greatly reduce the tone. I’m wondering if it is a particular output voltage of the battery that made it work. The Fischer team says no the operating voltage is regulated. I’m wondering if it is really true.

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...

It was pointed out to me by my buddy Jim that the AQ runs three different pulse FQ ranges--one for each mode. These go from highest in A/M (4.02-4.17) to lowest in volcanic. (1.54-1.56). Tone mode is in the middle at 3.04-3.12. I've come to recognise that each has its seperate turnng characteristics. Unlike most detectors--the A/M is easier to tune than the Tone mode. With Tone, you have the "back end" ground noise that warbles in and out. If you are overtuned, this will overwhelm your target sounds. The Tone mode needs to be run closer to preset Gain, with a lower Threshold and Volume. It also needs a slower sweep speed for deep targets to stand out. With Tone and Mute, targets sound wider and flatter--especially when you run low delay. As with any pulse, the low conductor sensitivithy of the low delay settings makes small targets sound bigger. A setting of 10 uSc or higher makes signals more defined. So while there are differences between the depth of the A/M and tone modes--the way to reduce this difference is with proper tuning. As you increase the Gain in Tone mode, the signal flattens out--and target sounds are weaker. For higher Gain settings, Mute has a lot of potential in that it has no "back end" ground noises. At the same time it can also be overtuned. A good way to become familiar with the responses of the AQ (or any detector) is to start witih the "extreeme" settings and learn to recognize how overtuning sounds in the threshold and target tones. Oddly enough, athough the REJ control is suppposed to only be active in tone mode, turning it right down increases the depth. Still testing this machine--it certainly has a lot of potential. cjc

Anything to watch out for trying a coil on the AQ? I have a Beach Hog Bigfoot style coil I’ve used with my GP Extremes. Don’t want to kill the AQ!

Will there ever be a waterproof version of the AQ are they still selling the limited AQ what up with this company are they saying anything

my AQ set up. Float to keep the back end up if you have to let go of it. the foam also acts to keep the lanyard positioned. the lanyard keeps the unit under control and clear of any of the jacks / cables. I also have a plastic power jack guard made from a shampoo bottle. I also wrap the power jack and coil connector with rubberized tape to be on the safe side. cjc

Just one thing I've noticed in getting down to some detailed testing of this machine. It was pointed out to me that each mode runs different kHz ranges. I've noticed that each tunes differently so the idea of flicking one to the other is not a good one in that each needs different Sensitivity, Volume and Threshold to perform at it's best. cjc

When does the AQ starting to false when on the wet sand coil is just covered with water when in 2-3 of water

I vaguely recall the original AQ videos that seemed to show iron reject and detect a gold ring right on top of iron. I don’t have any black sand but should I be able to get a discriminating tone from a nail or tent stake? I only get tone differentiation in the Reject 9-10 range - and it’s pretty useless. What is the real world scenario where this works. How do I test this? Oh yeah, just for kicks I tried to see if it could detect a 5g nugget….nope.

Went wading in the water today I noticed if water splashes onto the coil connector it false (saltwater) the slightest bit of water touched the connector it would false I wet my fingers with the salt water and touched the connector and it false. I put the pulse delay all the way up brought up the ats up changed modes i did not dunk the control box I have not tried it with freshwater also my pulse delay nob spins all the way around and doesn’t stop at 11 is that normal. it does click on every number

Was wondering if someone can tell me if I have my machine set right i place a US nickel at 12 in the dry sand and barely herd a signal settings are all metal volume- all the way 9 senstivity-7-8 threshold barley here it around 6 ats at 0 reject at 0 pulse delay 7-7.5 now I saw joe video with him doing air test and he was getting close to 19 in was wondering what other hunters are getting with there machine on a air test everything is stock. Headphones, battery I also know that a pulse air test isn’t the actual depth. I am just comparing mine to joe video and was wondering what everyone else is getting

Just arrived today--very sharp small coil, tests very deep. Reminds me of the ol' Cuda--very lively. Quite happy with this purchase. cjc

***Please note that the videos are maybe not completely upload*** This is to demonstrate the normal behaviour of the AQ when its coil is swinging under sea water. Note that the average salinity of sea water around the world (with a few higher or lower exceptions) is between 34 to 36 ppt Ref: https://en.wikipedia.org/wiki/List_of_bodies_of_water_by_salinity Here the IMPULSE AQ LIMITED IN SURF PART 1 --> 7us pulse delay SALINITY 36 grs per liter (PSU) This is the link to a video taken during such tests. There was no reaction of the AQ while balancing the coil under the water (50cm deep) There was a fast recalibration made by the system at coil entering and leaving the water surface The test have been conducted in the surf of a beach facing the English Channel as a confimation , (Average Salinity = 34-36 ppt) This is the link to a video taken during such tests. Here the IMPULSE AQ LIMITED IN SURF PART 2 --> 8us & 9µs pulse delay SALINITY 36 grs per liter (PSU) Here bad and good swing difference with 1 inch variation

Does anyone know what the TX pulse width is on the AQ ? I know from previous experience and from some PI machines that I have used (and currently use) that longer TX pulse widths are important to energise the bigger gold rings (which can also be the higher karat ones as well). Typically, greater then 300 uS is needed in order to “light these targets up”. Furthermore, quicker pulse delays are not essential in seeing these bigger targets as the decay drop-off isn’t so pronounced when compared to the smaller profile rings. Tony.