New Coil For My 1235X Arrived Today!

[Fisherfinder]

I haven't purchased much for my detecting hobby in a good long while but I thought, why not?

I bought a 10" Fisher spider coil with a cover & the lower rod used on eBay for $79.00 shipped.

So far I am not jumping up and down with the air test I performed.

I plan to add to this thread, air testing each of my coils on the 1235X and see what the comparison shows.


[attachment 210321 SpiderCoil.jpg]

 

[Fisherfinder]

I went out and tried the spider coil tonight and this is what I found.......


[attachment 210373 Finds001.jpg]

 

[ElginTim]

What and how many coils do you have for that 1235X? I only have two, the elliptical and the 8" spider. I find the elliptical loses a bit of depth, but is easir to work in the tight spots.

BTW, my 1235X is my gold magnet. Mostly because the totlots and sandy spots are where I use it primarily and they have a better ratio of gold to other finds than the dirt sites, where the F70 or CZ's take over.

 

[Fisherfinder]

Hey ET,
I have 5, but two of them I purchased this morning, (a 5" & a 3 3/4"), so I have not tried them yet.

The stock 8" is what I have used for years, it came with my machine. When I bought my machine I also bought the 11" with a cover.
That coil is still brand new, I never tried it. The 10" spider coil is new to me, I have only used it once.

So in all I have, 3 3/4", 5", 8", 10", 11"

Since I mostly work sand boxes now a days I am thinking to sell the 10"spider & 11"

I always wanted an elliptical but never chased one down.

I have found mostly coins in local sand boxes, but, the best find to date for me is a 14ct gold medal found with my 8",
despite heavy EMI from an electrical sub station right next to a local sand box.

See this thread
http://www.findmall.com/read.php?18,1551122

 

[Ron from Michigan]

Fisherfinder,I used the 5 inch a lot on my 1236 and was really impressed with the separation and depth of the smaller coil.HH Ron

 

[Fisherfinder]

Thanks Ron,

The 8" I have been using from the start has always been limited. If I get anywhere near one of the metal poles I get a max signal.

After a lot of reading, and knowing why some people use the 5" x 10" elliptical, I thought I would do my best to find a 5".
I was lucky and found a 5" & a 3 3/4", still have to find covers though.

I don't know if I will be doing much searching in the sandbox by that electrical sub station anymore except for some testing.

From all I have heard and read the 1236x2 is an excellent machine.
I know I want one, and the 1236 uses the same coils I already have for my 1235.
.

 

[yukonbuck]

Air tests are bunk. There are too many variables. Is there a screw or other metal in the table? Is your house emitting EMI? Do you have your detector in disc mode or all metal mode? did you start the coin close to the coil and move away or did you start far away and move close. Plus the soil can enhance your signal realworld. Also try coiling the cable way up close to the control box instead of down by the coil. You should have only the straight cable running up the shaft for about 16 inches then start the coiling to reduce inductance. Good luck!

 

[Dave J.]

Coiling the cable around the pole won't change the inductance: however, it can over time degrade the cable shielding resulting in more EMI problems.

Nearly everyone does it anyhow. User's manuals even say to do it. I've been fighting this for nearly 30 years but it's a losing battle because for most customers, the damage to the cable is slight enough not to result in identifiable service problems.

I loop the cable in a hank and secure it gently with Velcro. It may be ugly but I know I'm not damaging the cable.

--Dave J.

 

[SkiWhiz]

Coiling the cable around the pole won't change the inductance: however, it can over time degrade the cable shielding resulting in more EMI problems.

Nearly everyone does it anyhow. User's manuals even say to do it. I've been fighting this for nearly 30 years but it's a losing battle because for most customers, the damage to the cable is slight enough not to result in identifiable service problems.

I loop the cable in a hank and secure it gently with Velcro. It may be ugly but I know I'm not damaging the cable.

--Dave J.

Never ceases to amaze me all a person can learn on a detecting forum, sometimes not even detector related. Case in point- I have never heard of a hank (other than a man's name) before. Thanks Dave, can't say that I didn't learn anything today.

On a side note I just wanted everyone to know that Dave sent me a pm & a email explaining something to me that I had posted on the forum. We are lucky to have such a nice guy in the know around. Thanks Dave. Steve.

 

[SkiWhiz]

n/t

 

[MarkCZ]

Air tests are bunk. There are too many variables. Is there a screw or other metal in the table? Is your house emitting EMI? Do you have your detector in disc mode or all metal mode? did you start the coin close to the coil and move away or did you start far away and move close. Plus the soil can enhance your signal realworld. Also try coiling the cable way up close to the control box instead of down by the coil. You should have only the straight cable running up the shaft for about 16 inches then start the coiling to reduce inductance. Good luck!

Is there a screw or other metal in the table?

I hang the coil over the edge of the table about a foot, also air testing it Disc motion mode it won't pick up the screw unless it moves.

Is your house emitting EMI?

You can tell that if your machine is unstable or you can't turn up the sensitivity very high.

Do you have your detector in disc mode or all metal mode?

I only hunt in disc mode, so I test it in disc mode.

did you start the coin close to the coil and move away or did you start far away and move close?

I start at the coil and move away until I lose the signal, then I move back in until I pick it back up again but I move it out far enough to be out of the detection field before I move it back in.

Plus the soil can enhance your signal realworld!

I don't know what's it mineralize soil that when you have 8" of it between the coil and the target the detector gets a better signal? now ferrous or other iron can rust and create a LARGE halo around the target and for sure we be picked up at a greater distance, but non-ferrous doesn't create that much if any halo. So, I have never had a detector to air test at 8" on a non-ferrous target and detect the same type of target at the same depth and never over! its always less, always!

Also try coiling the cable way up close to the control box instead of down by the coil. You should have only the straight cable running up the shaft for about 16 inches then start the coiling to reduce inductance.

All of the newer coil cables that I've seen are very well shielded, so creating a field of inductance through the shielding isn't as much of a problem as the VERY old coil cables of yesteryear!

Now, what I don't like about coiling the cable up around the staff is it makes it like a coiled up telephone cord and makes it hard to deal with when changing coils. Now I had been thinking about running it straight up the shaft and then making a nice loop with the rest of it (a small hank LOL) and wire tying just to keep it from getting all the coils in it.

Mark

 

[RELIC_HUNTER]

Coiling the cable around the pole won't change the inductance: however, it can over time degrade the cable shielding resulting in more EMI problems.

Nearly everyone does it anyhow. User's manuals even say to do it. I've been fighting this for nearly 30 years but it's a losing battle because for most customers, the damage to the cable is slight enough not to result in identifiable service problems.

I loop the cable in a hank and secure it gently with Velcro. It may be ugly but I know I'm not damaging the cable.

--Dave J.

Never ceases to amaze me all a person can learn on a detecting forum, sometimes not even detector related. Case in point- I have never heard of a hank (other than a man's name) before. Thanks Dave, can't say that I didn't learn anything today.

On a side note I just wanted everyone to know that Dave sent me a pm & a email explaining something to me that I had posted on the forum. We are lucky to have such a nice guy in the know around. Thanks Dave. Steve.

I have noticed this in early treasure magazines and often wondered why. Now I know.