As I mentioned some days ago, I was afraid to have a non waterproof control box after minor works on the coil's cable and the PCB inside.
The final result of this morning Is been: lot of unstable treshold drift since a few minutes inside the water(no way to calm down the treshold even with GB off).
Some minor short cause I can see the voltmeter crashed and fuc...d up...
After almost two hours of terrible noise and a few real signals, nothing to Say but a finally stable treshold without signals at all when targets were under or over the coil...
This means to me:the coil isn't working anymore...
Maybe the dumping resistor?
Maybe the lower resistance due to the cable shortening?
Nope....The gasket leakage and maybe the connector too.
I don't even have the time to dismantle again today..🤬🤬🤬🤬
Pissed as usual
I am still need to metal detecting and learning an original tdi. So lately I have been experimenting with the different controls and how they affect the machine.
I read some instructions that mentioned running the gain at the point that the threshold remained steady and did not waiver. This typically leaves me with a gain of 3 or 4. Does this sound right or am I missing something?
I've been experiencing lower yields due to sites being detected, by me for sure and there are also signs by others previously. SchoolofHardNox's success on a beach using the Minelab GPX 5000 reminded me to re-read Steve's treatise on using the (in his case original big box Pulsescan) TDI for coin detecting.
I just a few days ago stumbled upon a promising site where extra depth could be key. It's a schoolyard going back at least to 1955. Unfortunately as is the case in many of my public sites, it has a history of backfilling. From aerial photos I see than in the 50's it was grass/sod covered but in the early 60's they put down gravel. The person who told me about the site (a person who walked up to talk when he saw me hunting a nearby park) said he was a student there 45-50 years ago and at that time it was (again) grass/sod. I did a one hour survey hunt with the Minelab Equinox (11" coil) and encountered a couple inch thick gravel layer about 5" down. I did find one Wheatie below the gravel, but 7" is getting deep for my detector + soil mineralization combination so if coins remain from the 50's (pre- gravel layering) then I expect I will do better with extra depth (and that may even be required).
One thing I've found in my detecting of these older sites -- there are always nails present. So even if my TDI/SPP can deliver in the coin category it's going to be signalling on a lot of nails. One of the tricks Steve used was to set the conductivity switch to high conductors (low tones) but the TDI/SPP doesn't have that feature -- I will be hearing both high and low tones. This is a dual disadvantage -- extra tones to have to mentally tune out but also extra threshold noise since both parts of the signal spectrum will be contributing to that as compared to only half when the conductivity-low switch selection is made (on all TDI's except the SPP version).
Here are some specific concerns:
1) Am I fooling myself thinking I can get extra depth with the TDI/SPP, particularly when it comes at the expense of a noisier threshold?
2) Which coil(s) should I be using (choices I'm considering are 6"x8" Nugget Finder Sadie mono, 7"x14" NF mono, and 12" round White's 'Aussie' mono)?
3) Should I flag the promising targets but double check with the Eqx 800 (and if so, should I use the 11" or 12"x15" coil on the 800)? (Note, even if I choose this route I will likely at first dig, regardless of what the 800 says, just to get an idea of what is giving the signal and how deep the targets are.)
Any other advice (from anyone) is appreciated.
I have an easy and maybe stupid question to present now...
Observing my TDI Bh, with both of the coils I own (the original 12" and the aftermarket Detech 8"), I can clearly see way too long wire around the shaft and I'm forced to make several loops up to the control box near the handle.
Supposing to measure the right lenght for the maximum extended shaft, and to cut away the hipmount mile long cable.....Am I doing a disaster or not?
I actually can't remember the technical cable's specs in the amazing pdf Steve posted time ago, but if I'm correct it talked about to reduce some current resistance with a slight performance improvement too...Have I seen a mirage or what?...
I'm not kidding 😜...
It's just me, looking for something to play with, suffering for a missed AQ.
By Cascade Steven
I am interested to learn more about the 7.5-inch mono versus the 7.5-inch Aussie coils that are available for the TDI series. Is there an advantage of one coil design over the other when hunting for nuggets? I have the standard 12-inch dual field and also a Super Pulse 150 coil and am curious whether I should add either or both of these coils to my collection? Or should I purchase one of the new Nugget Finder 8x6 Sadie mono coils? Any thoughts or advice would be greatly appreciated.