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6" coil update
- Thread starter loki
- Start date
B.T... Just a quick question: Why the 6" coil? Would it be "parallel
in ability" to the Terra X-70 as is the little known circular 6" DD to the 18000? This accessory coil, made for the 18000 is dynamite in and around the rocks and brush. It "boots" up not only to the 18000, but also the Eureka Gold and the 17000. With the 17000 in 32 kHz it is
capable of finding sub-grain flakes.
A wide range of accessory/optional coils sell a detector. Like a golfer who has different golf clubs. Just my thought...
in ability" to the Terra X-70 as is the little known circular 6" DD to the 18000? This accessory coil, made for the 18000 is dynamite in and around the rocks and brush. It "boots" up not only to the 18000, but also the Eureka Gold and the 17000. With the 17000 in 32 kHz it is
capable of finding sub-grain flakes.
A wide range of accessory/optional coils sell a detector. Like a golfer who has different golf clubs. Just my thought...
At this point... for prospecting... wouldn't it be best to get the 5x10 18.75 kHz DD orders backfilled before another coil?
Lucky me... I have access to one of the 5x10 18.75 coils... After a year of trying to use another detector unsuccessfully I gave the 70/18.75 DD setup a try... within a few minutes using it I found my
first nugget, then the second... Since then another making three. They
are nice keepers... not specks... about 1/2 or more pennyweights.
I believe this combination has potential to reach down into the mid-range zone where the Low-frequency (abitrary +30 kHz) detectors seem to struggle...
I believe(?) this mid-range zone is from 5 or more inches deep... where the desert ground changes from loose to harder pack (below the surface). This mid-range zone can be elusive and not everywhere. Such as shallow hardpan or caliche... The nuggets can be larger and are deeper... This is where the VLF (10-20 kHz) detectors can be a choice.
At this point I believe the 5x10 eliptical DD (which is 18.75 kHz) a good choice hooked up to the 70... I run w/o the skid-plate and keep the coil level with terrain...
Any thoughts...? This is how we learn
Lucky me... I have access to one of the 5x10 18.75 coils... After a year of trying to use another detector unsuccessfully I gave the 70/18.75 DD setup a try... within a few minutes using it I found my
first nugget, then the second... Since then another making three. They
are nice keepers... not specks... about 1/2 or more pennyweights.
I believe this combination has potential to reach down into the mid-range zone where the Low-frequency (abitrary +30 kHz) detectors seem to struggle...
I believe(?) this mid-range zone is from 5 or more inches deep... where the desert ground changes from loose to harder pack (below the surface). This mid-range zone can be elusive and not everywhere. Such as shallow hardpan or caliche... The nuggets can be larger and are deeper... This is where the VLF (10-20 kHz) detectors can be a choice.
At this point I believe the 5x10 eliptical DD (which is 18.75 kHz) a good choice hooked up to the 70... I run w/o the skid-plate and keep the coil level with terrain...
Any thoughts...? This is how we learn
brissietex
Member
I can see the need for a LF or MF 6" coil. After using a 5" coil on my Fisher CZ70 for years, I am convinced this size coil is perfect for parks, trashy or iron filled. Seeing that most of my finds are within 6" in these parks (having found even 40s and 50s silver < 3" in local Brisbane parks), having the separation level of a smaller low frequency coil on the XT-70 would make it a fun machine in the parks around here. The 5x10 HF coil is nice for the parks but the higher frequency may cause a bit of chatter in these parks tho dropping the sensitivity does help a bit in this area. As for nugget finding, the 5x10 HF is definitely it.
Personally, I don't need a 6" coil right now but may get one in the future. What I'd really like for the XT-70 is a 12"+ coil but hey hopes eternal.
cheers...Keith
Personally, I don't need a 6" coil right now but may get one in the future. What I'd really like for the XT-70 is a 12"+ coil but hey hopes eternal.
cheers...Keith
Thank you Keith... The X-terra 70 can be used as a "Do All" detector
by using the correct coil for the job.
It is evident that the needs of the coin-hunters and those of the nugget-hunters are different. It looks like both groups need to be patient. For everyone owning a '70 as the basic platform for the various coils; it is a "win-win" situation. Especially for the dyed-in-the-wool gold hunters, as nugget hunting is a small facet of do-all applications as other uses include coin hunting, relic hunting, fresh and salt water hunting.
by using the correct coil for the job.
It is evident that the needs of the coin-hunters and those of the nugget-hunters are different. It looks like both groups need to be patient. For everyone owning a '70 as the basic platform for the various coils; it is a "win-win" situation. Especially for the dyed-in-the-wool gold hunters, as nugget hunting is a small facet of do-all applications as other uses include coin hunting, relic hunting, fresh and salt water hunting.
I found my first class ring last year, the first time on the beach with my 70 and the 5 x 10. But, it does like small foil too, so, that's why I use my GT at the beach. I can tell trash from treasure much better with my Sov. The 6" coil will be almost permanent on my 70. Not sure yet whether it will be the conentric or the DD, but, it will be fun to compare them.
G,day Parrott.
Yeah that is why. I had the 6" round on an FT16000 and its ability to slot in where others cant go made it a winner. The 10x5 seems small enough but when you slap a 6 on in its place it is amazing where you can poke that little coil into.
I was out yesterday at a dog of a place, scrub wise, and was wishing I had the 6" coil. I was using the 10x5 and even though I reckon its a great coil I really felt like the 6 would be the one for that place.
I wouldnt get it and then leave it on for everywhere I went, that would be nuts, but yeah for the scrub and amongst rocks etc: it should be tops.
Oh yeah, I picked up three bits which combined came in at just on a gram. Small but better to go home with a few smallies than none at all.
Have a good one.
Yeah that is why. I had the 6" round on an FT16000 and its ability to slot in where others cant go made it a winner. The 10x5 seems small enough but when you slap a 6 on in its place it is amazing where you can poke that little coil into.
I was out yesterday at a dog of a place, scrub wise, and was wishing I had the 6" coil. I was using the 10x5 and even though I reckon its a great coil I really felt like the 6 would be the one for that place.
I wouldnt get it and then leave it on for everywhere I went, that would be nuts, but yeah for the scrub and amongst rocks etc: it should be tops.
Oh yeah, I picked up three bits which combined came in at just on a gram. Small but better to go home with a few smallies than none at all.
Have a good one.
B.T... I have a (little advertised or known) 6-inch circular DD coil that Minelab made for the XT-18000. It was not advertied in the USA and I understand it was not popular in Australia.
I was fortunate to by a New-old stock from one of the Australian distributors. It seems to work very well with my old (but a goody)
17000 in 32 kHz. I fully agree with you about its ability to work in the scrubs and around rocks. Mine is very well made... stable and sensitive to the bits.
I believe this 6-inch cirular DD coil, as made for the 18000 would also boot to other post-16000 series; such as the 17000 and Eureka Gold.
Back... years ago I had the early minelabs; the yellow box and greenbox. Also a prototype FT 16000 which I returned to MinelabAU.
I really like my 17000 in 32 kHz... The same frequency as the "American Gold Striker." If anyone in Australia reading this
thread should happen to have any coil made specifically for the Gold Striker (32 kHz) laying around, let me know. It also boots up to the 17000 if in 32 kHz mode.
I was fortunate to by a New-old stock from one of the Australian distributors. It seems to work very well with my old (but a goody)
17000 in 32 kHz. I fully agree with you about its ability to work in the scrubs and around rocks. Mine is very well made... stable and sensitive to the bits.
I believe this 6-inch cirular DD coil, as made for the 18000 would also boot to other post-16000 series; such as the 17000 and Eureka Gold.
Back... years ago I had the early minelabs; the yellow box and greenbox. Also a prototype FT 16000 which I returned to MinelabAU.
I really like my 17000 in 32 kHz... The same frequency as the "American Gold Striker." If anyone in Australia reading this
thread should happen to have any coil made specifically for the Gold Striker (32 kHz) laying around, let me know. It also boots up to the 17000 if in 32 kHz mode.
The 17000 on 32 khz was a great combo and here, when I tried it at least, on 32khz with the 10" round coil it went deeper on that setting and coil combo than on the lower freq did on gold around 1 oz.
The goldstriker was not a great hit here for some reason and I only ever saw 1 in all my time detecting in the bush. Those little coils can deliver some big surprises. Should be a real goer I reckon.
The goldstriker was not a great hit here for some reason and I only ever saw 1 in all my time detecting in the bush. Those little coils can deliver some big surprises. Should be a real goer I reckon.
B.T... you are very knowlegable... The Goldstriker was not too popular... However its coils were designed for the 32 kHz mode. I
have its standard coil; a 5x10 DD. It was made for the 32 kHz mode.
However, It can be used in my 17000 in the 32 kHz mode. This setup is very stable. Unfortunately, the 17000 control box (plastic) is in terrible shape and it cannot be longer used as a pole mount. So I use it in the bag as a chest mount. The lead wire is noisy. I hope that I can get it repaired.
The 17000 came originally with just the round circular 8-inch DD.
I also have a WOT 15-inch spoked DD, but the 6-inch circular DD has
been very effective. IMO, the 32 mode seems to be more effective then
the "7" + or minus frquency, so I use it. But with the WOT I used the 7.?? mode.
I also have an Eureka Gold... standard coil. it seens to be "skitish" in 60 kHz, so I mostly hunted in the 20 kHz and if I got a "sound" I went after it in 60 kHz.
Now, I'm giving the Terra-70 my full attention. I have read all of your posts on the forum and you have been most helpful in getting me up to speed.
have its standard coil; a 5x10 DD. It was made for the 32 kHz mode.
However, It can be used in my 17000 in the 32 kHz mode. This setup is very stable. Unfortunately, the 17000 control box (plastic) is in terrible shape and it cannot be longer used as a pole mount. So I use it in the bag as a chest mount. The lead wire is noisy. I hope that I can get it repaired.
The 17000 came originally with just the round circular 8-inch DD.
I also have a WOT 15-inch spoked DD, but the 6-inch circular DD has
been very effective. IMO, the 32 mode seems to be more effective then
the "7" + or minus frquency, so I use it. But with the WOT I used the 7.?? mode.
I also have an Eureka Gold... standard coil. it seens to be "skitish" in 60 kHz, so I mostly hunted in the 20 kHz and if I got a "sound" I went after it in 60 kHz.
Now, I'm giving the Terra-70 my full attention. I have read all of your posts on the forum and you have been most helpful in getting me up to speed.
I have found over the years that a "skidplate" can be bothersome. Some do not fit well and can warp and let in fine sand. Also, W/O a skidplate's thickness a little more "depth," even though slight may make a difference in an elusive signal. I do not "beatup" a coil. I use a thick rubber band around the circumferance. Or non-conductive tape. If I decide to be a "shoveler" I will use the skidplate. Some of the early "skidplates" snapped on tight. The lastest seem to be a press-on fit.