100 khz detectors

[gl1945]

The area I live in here in the UK has minimal levels of ground mineralisation. Centuries of activity on the land does often mean that the iron infestation can be a problem.
Back in the 70's I did pretty well with the old 100Khz machines of the day and I would like to have another go with one.

There are plenty of vintage detectors of that era about but determining what frequency they work on is causing me problems. That information seams to have been rarely published.


I think what I may need is a 100Khz machine with disc and some sort of ground control and a press button retune. A meter would be nice but isn't essential as the general rule on the farm land I search is - if it isn't iron, then dig!
Something not too heavy would save my old bones, but if that is too much to ask, so be it. If memory serves me, most were heavy in those days!

Perhaps one of the last of the 100 khz detectors, although I know some of the old classics take some beating from what I've heard.

I would really appreciate suggestions of make and model numbers to help me track one down.
Thanks in advance!

[golfnut]

100k is a little high for general farmland use.

It would be more suited to small gold flake.

18k is a soft limit for single freq machines.

12k is a happy medium and will see plenty of interesting targets with depth and descrimination

[kt315]

if not knowledge there is a book.
http://www.geotech1.com/forums/forum...Published-2015
to my sorry i am not in course of those 100kHz machines... terra incognito. something from those Compass detectors?

[Tim]

The Whites Goldmaster is 48khz, the Fisher Goldbug is 19khz(?). Most others are less. Both are extremely sensitive to small gold, but by their small coil size, not suited to detection at depth.
My home-made Beat-balance detector is 110 khz and by design able to ignore most trash, but for extremely rusty junk ground the BFO (AM radio-type) detector of one circuit and one coil will silence on steel and beep(high-pitch signal) on non-ferrous. Alternatively, if it is tuned to the other side of the radio beat-note it will do the opposite- silencing on non-ferrous and "beeping" on iron. So it depends what you are targeting. For maximum depth and no discrimination, a Pulse induction detector will be best, but exponentially more expensive.
I would suggest a vlf detector with a large coil. They will get reasonable depth, and offer discrimination between ferrous and non-ferrous, however depth and sensitivity will be retarded for non-ferrous with discrimination increase.
Weight being a factor you should get a mid-range vlf with a decent sized coil or coil options. Maybe Bounty Hunter Tracker 4 or a Chinese mid-price-range detector. If you care to make your own the Talking Electronics circuit 8(at bottom of page) can be assembled on plywood with screws and cup washers. The coil can be made of any insulated wire on hand, and as long as the (good quality)am radio is properly positioned, oriented and distanced from the transistor a loud signal can be obtained. The bigger the coil, the deeper it will detect, but the less sensitive it will be to smaller targets.
Sorry most of the posters here think it below themselves to respond to your reasonable questions. They consider us dummies.

[gl1945]

Its the "see through iron " capability that intersts me. Even at the expense of some depth.

[kt315]

ok. so i put a freq table again, from archive, and we will mind what to choice for the mister.

Best frequency to use:
US Dime = 2.7 KHz
Gold Coins & other US Coins = below 10 KHz.
Us Nickel & gold Jewelry = 16.5 KHz
Gold Nuggets = above 20 KHz
---------------------------------Metal Detectors based on Operating Frequency
Blisstool LTC64X v3...........Base operating frequency: v3 - 8.0 KHz
Adjustable operating frequency (+/-60Hz)
Bounty Hunter Land Star............6.6kHz
Bounty Hunter Lone Star............6.6 kHz
Bounty Hunter Pioneer 505........6.8 kHz
Bounty Hunter Quick Silver.........7.0 kHz
Bounty Hunter Texas Pilot...........7.0 kHz
Bounty Hunter Time Ranger.......6.9 kHz
Bounty Hunter Tracker IV............6.6 kHz
DeepTech Vista Gold................25 kHz
DeepTech Vista Smart.............15.5 kHz
DeepTech Vista Rebel ..............8 kHz
Discovery Treasure Baron.......12.5 kHz
Fisher 1266-X.............................4.8 kHz
Fisher 1270x...............................8.2 kHz
Fisher 1280-X 8" Coil................2.4 kHz
Fisher CZ-21 10" Coil.............5,15 kHz
Fisher F2.....................................5.9kHz
Fisher F4.....................................5.9kHz
Fisher F5.....................................7.8kHz
Fisher F70.................................13 kHz
Fisher F75.................................13 kHz
Fisher Gemini-3........................82 kHz
Fisher Gold Bug I......................19.2 kHz
Fisher GoldBug II 6.5" Coi........71 kHz
Fisher GoldBug II 10" Coil........71 kHz
Fisher Quicksilvers (CZ-5, CZ-6a and CZ-20) operate on two frequencies — 5 kHz and 15 kHz
Golden Sabre Plus .................. 15 kHz
JW Fishers 8x ............................100 pps
Garrett Ace 150...........................6.5 kHz
Garrett Ace 250...........................6.5 kHz
Garrett Ace 350...........................8.25 kHz
Garrett AT Pro............................15 kHz
Garrett AT Gold..........................18 kHz
Garrett Deepseeker.................... 5.5 kHz
Garrett Gold Scorpion.................15 kHz
Garrett Groundhog.....................15 kHz
Garrett GTA..................................6.5 kHz
Garrett GTAx_500.......................7.0 kHz
Garrett GTI 1500..........................7.2 kHz
Garrett GTI 2500..........................7.2 kHz
Garrett GTP 1350........................7.2 kHz
Garrett Infinium Land & Sea.......730 pps
Garrett's Sea Hunter ............ 750 pps
Garrett Treasure Ace 300...........6.4 kHz
Minelab E-Trac............................1.5-100 kHz
Minelab Excalibur II - 8" Coil.......1.5-25.5 kHz
Minelab Excalibur II - 10" Coil.....1.5-25.5 kHz
Minelab Eureka Gold...................3 frequency (6.4kHz, 20kHz, and 60kHz)
Minelab Explorer SE Pro............28 different frequencies, from 1.5kHz to 100kHz
Minelab Musketeer Advantage Pro...5kHz
Minelab Quattro MP.....................28 different frequencies at once, from 1.5kHz to 100kHz
Minelab Sovereign.......................BBS - 17 different frequencies at once, l.5 kHz to 22.5 kHz
*Minelab Sovereign and Excalibur operate over a broad range of frequencies (2 - low of l.5 kHz to 22.5 kHz — 17 individual frequencies simultaneously.
Minelab X-Terra 70....................(VFLEX compatible) Coil Frequency Options......3 (Standard 7.5 kHz, Low 3kHz, High 18.75 kHz)
Minelab X-Terra 305....................2 (Standard 7.5kHz, High 18.75kHz)=(coil frequency options)
Minelab X-Terra 505...................3 (Standard 7.5kHz, Low 3kHz, High 18.75kHz)=(coil frequency options)
Minelab X-Terra 705....................3 (Standard 7.5kHz, Low 3kHz, High 18.75kHz)=(coil frequency options)
Shadow X2 was listed as low a 9.6 kHz
White's Beach Hunter 300..........(Multiple Frequency)
White's Coinmaster Pro..............8 kHz
White's Coinmaster GT...............8.192 kHz
White's E-Series DFX 300.........3 kHz, 15 kHz, or use both frequencies
White's Goldmaster GMT..........50 kHz
White's Gold Master Vsat.........50 kHz
White's M6 Matrix Series..........14 kHz
White's MXT 300........................14 kHz
White's MXT Pro........................14 kHz
White's Prizm 5G.........................8 khz
White's Prizm 6T..........................8 kHz
White's Sierra Madre..................6.5 kHz
White's SL series........................6.59 kHz
White's Spectra V3i....................2.5, 7.5, 22.5 kHz
White's Spectra VX3..................2.5, 7.5, 22.5 kHz
White's Surf PI.....................600 pps
White's Surf PI Dual Field..........800 pps ?
White's XLT..................................6.5 kHz
Teknetics Alpha..........................7.8 kHz
Teknetics Delta 4000..................7.8 kHz
Teknetics Gamma......................7.8 kHz
Teknetics Omega.......................7.8 kHz
Teknetics T2..............................13 kHz with frequency shift option
Texas Titan 9000........................6.6 kHz
Texas Titan 9000 Pro.................6.6 kHz
Texas Titan 9000 Pro Plus.........6.6 kHz
Tesoro Cibola............................14.3 kHz, 14.5 kHz, 14.7 kH
Tesoro Compadre.....................12 kHz
Tesoro Cortes............................10 kHz
Tesoro DeLeon..........................10 kHz
Tesoro Golden uMax.................10 kHz
Tesoro Lobo...............................17.5 kHz
Tesoro Sand Shark.................600 pps
Tesoro Silver Sabre µMax........10.6 kHz
Tesoro Tejon..............................17.2 to 17.6 kHz
Tesoro Tiger Shark...................12.5 kHz
Tesoro Vaquero........................14.3 kHz, 14.5 kHz, 14.7 kHz
XP Deus....................................4,8,12,18 kHz

[mschmahl]

Thank´s for this table KT315.
There are some failures in frequency of Minelab Explorer SE, E-Trac and Quattro. They can´t rich 100 kHz It is from 12.57 to 16.16 kHz. See this video

around 3:00 minutes.

[Jiminy]

Yes. Compass Yukon 99b is 100khz.

[gl1945]

Thanks for the replies,
I am aware of the pros and cons of the various VLF frequecies, I have been detecting since the 70's.
It is the success I had in those days on iron infested sites with the 100khz detectors of the day which makes me want to try them again.
As I said before, there are plenty of vintage machines to be had, I just need to know which models of that time were 100khz or there abouts.
Old Compass detectors are not so common over here but there seams to be plenty of Whites. and of course the UK produced models like CScope etc. But which ones?

[gl1945]

Thanks Jiminy,
I think that all of the Yukons were 100khz. I do have a Judge 6 but it is a bit sick. I have been trying to sort it out but I have no schematic and dont seam to be able to find one.
Old Compasses are hard to find here.

[kt315]

Thank´s for this table KT315.
There are some failures in frequency of Minelab Explorer SE, E-Trac and Quattro. They can´t rich 100 kHz It is from 12.57 to 16.16 kHz. .

and what you want to tell me about??? peak voltage in PI delta pulse has 1000000xxxx Hz reached by harmonics. we say and mean about ONLY WORKING/USED/PROCESSED RX signalfrequencies. not about your dreaming. NOT ABOUT THE HARMONICS. be MORE grounded in this matter and not be so zombie.

[kt315]

Thanks for the replies,
I am aware of the pros and cons of the various VLF frequecies, I have been detecting since the 70's.
It is the success I had in those days on iron infested sites with the 100khz detectors of the day which makes me want to try them again.
As I said before, there are plenty of vintage machines to be had, I just need to know which models of that time were 100khz or there abouts.
Old Compass detectors are not so common over here but there seams to be plenty of Whites. and of course the UK produced models like CScope etc. But which ones?

you can ask Sven. Sven found Compass X-70 for low price. ask him here or there.
http://compass-metal-detector-forum....td7605686.html

[mschmahl]

and what you want to tell me about??? peak voltage in PI delta pulse has 1000000xxxx Hz reached by harmonics. we say and mean about ONLY WORKING/USED/PROCESSED RX signalfrequencies. not about your dreaming. NOT ABOUT THE HARMONICS. be MORE grounded in this matter and not be so zombie.

Thank´s for your nice words kt315.
To you kt315 I wanted to say : "Thank you for this data´s of different frequency-detectors." Not more.

To gl1945 I wanted to say: "Attention, if you will buy a 100 kHz-detector you can not buy a minelab, because it has only between 12.57 to 16.16 kHz."

I hope it is clearer now.
And be not so pissed, it was no attack against you!

[kt315]

you are welcome Msl. if anybody has more data I am ready to correct the list. this file has also frequencies of pinpointers.
no attack from my side, i only try to bring my mind out with my not so perfect english.

[Skippy]

Though not quite the age you are referring to, I recommend examining the Fisher Goldbug 2. This is a traditional analogue machine, running at about 72KHz, I recall. It can disc out iron, and is normally used with a 5 inch or similar coil. They are not cheap, unfortunately - low manufacturing volume is the likely reason.