70kHZ transmitter

[WM6]

Hi WM6. I am interesting for the second case. Frequency will be 100Khz so not so good for audio transformer. Ferrite core maybe is a solution!!!!. I want to have a strong signal at distance of 10...30m far from antenna so i believe that there is not need for high power.
2...3 watts maybe is enough

Regards

Agree. Ferrite toroid can be proper solution. As proposed, depend on amplifier output impedance (usually between 4-8 Ohms) you wind primary first with resistance equal (or a little more) to tech. spec. for speaker driven by amplifier, then test secondary first by 10 turns and measure peek-to-peak voltage at about 50% of amplifier power. Out of results you can calculate total secondary turns to about 50 - 60V pp no more.

As I say, I prefer air cored coil antenna (unshielded of course), but for distances of 10-30m ferrite cored antenna can be usable too.

Proper distance from detecting place is achieved when antenna polarization (changing orientation of antenna in different directions) can give you very clear differences in signal strength on field strength meter (receiver).

[Geo]

Agree. Ferrite toroid can be proper solution. As proposed, depend on amplifier output impedance (usually between 4-8 Ohms) you wind primary first with resistance equal (or a little more) to tech. spec. for speaker driven by amplifier, then test secondary first by 10 turns and measure peek-to-peak voltage at about 50% of amplifier power. Out of results you can calculate total secondary turns to about 50 - 60V pp no more.

As I say, I prefer air cored coil antenna (unshielded of course), but for distances of 10-30m ferrite cored antenna can be usable too.

Proper distance from detecting place is achieved when antenna polarization (changing orientation of antenna in different directions) can give you very clear differences in signal strength on field strength meter (receiver).

Thanks WM6.
I want to receive the signal with 2 loops with 90 degrees phase shift between them and to measure the phase shift.

[WM6]

I want to receive the signal with 2 loops with 90 degrees phase shift between them and to measure the phase shift.

Wish you full success Geo. Please report.

Are you talking about two TX antennas?

[Geo]

Wish you full success Geo. Please report.

Are you talking about two TX antennas?

One Tx antenna. I want to construct the pattent No US4079309.

Regards

[Dave J.]

Geophysical apparatus

Geo, that patent is a hybrid between "VLF geophysical" and Turam apparatus. It is for geophysical mapping and doesn't have anything to do with "LRL's" which (as everyone knows) is a designation for fraudulent apparatus. Not much use for detecting individual coins either- it circumvents the "rule of 64" that's been discussed recently on the Geotech "coils" forum, but pays the price of having done so.

If you are interested in constructing something according to that patent, this is the wrong forum, I highly recommend Geotech where there are a few people who actually understand this kind of stuff.

This is the LRL forum. If you expect technical help from the likes of Montana and Hung and Dell, you already know from them in their own words what kind of company you're keeping. By their own frank admission they don't know squat about electronics or physics, would you trust either one of 'em to change a burned out light bulb? Oddly enough, they regard their admitted ignorance as a defense! of their products! "Skeptics" don't have to make this incredible nonsense up, my slogan "read the advertisement" is a solidly paved road to the truth of the matter. Who posts links to Mineoro's website? It's me, not Hung! We obviously know the same thing about what's to be found there. Mineoro's own website and promoters' forum posts are the best source we've got for evidence of fraud to be made public. It's why people like me have argued in favor of allowing LRL fraudsters to say their piece, even when they're "marketing", something that's usually forbidden on forums. I say let the criminals and delusional incompetents be given the opportunity to confess to what they are, and that's something they do well.

Geo, I don't know your educational background. This is an enterprise where without high school level physics and math as well as practical knowledge in electronics, you're doomed. (That's why they teach this stuff in public schools-- so those who find the subject matter interesting won't be doomed.) One of my very well-educated co-workers just took a grad level University course in this stuff and found it challenging, but thankfully earned an A in the course. Thanks in part to my abundant file material on the subject, something to which the other students had no access.

After all, the physics basics have been kicking around for something like 100 years, it is only the technical ability to achieve improvements in performance of practical products that has changed.

The first patent on a VLF induction balance discriminator for ID'ing coins dates back to the late 1800's, before "electronics" even existed, it was just electricity. The patented device was a bench model for use by banks to detect counterfeit coins, but the physical principles haven't changed, any modern metal detector engineer would immediately recognize it for what it was. ....Sorry, I don't have the patent number, but the thing really existed, a few years ago I printed it out, but sorry, I don't know what file I stuck it in. No majick, just creative use of the technological possibilitities that presented themselves at that time. And, that was an extraordinarily creative period of scientific-technological endeavor, it created the modern world as we now know it.

--Dave J.

[Geo]

Dave, thanks for your reply.

1. When we speak about lrl you find me opposite because i found many objects with lrls. Also i found objects with simple gamma dowsing rods, but the thread is not this.

2. The thread is the pattent US4079309 for cave location.
I have read this pattent very well and when i"ll find free time (maybe on September) i want to experiment with it. I have study as electronic and electrician engineer but now i work only at my farm as farmer: Θυμωμένος:. It is easy for me to construct two lf receivers and to measure the phase shift between them. The transmitter also is not problem The problem as you know is how to make all them to work harmoniously between them.

Sorry because i write so little.... but my bad English don't allow me to write more or i need more time to looking at dictionary for the right words.

Regards

[mustefa ubram]

HI WM6
ONE QUESTION:
The output frequency range is changed after colliding with metal remote?Measurable change in the circuit?
What is the frequency range of the earth?FOR EXAMPLE: KHZ OR MHZ OR EXAMPLE MAXIMUM 100KHZ?
MHz frequency range to penetrate the soil?
G.L

[WM6]

HI WM6
ONE QUESTION:
The output frequency range is changed after colliding with metal remote?Measurable change in the circuit?
What is the frequency range of the earth?FOR EXAMPLE: KHZ OR MHZ OR EXAMPLE MAXIMUM 100KHZ?
MHz frequency range to penetrate the soil?
G.L

Dear friend, I do not understand you very well, but I will try to answer:

1. If we are speaking of reflection, there is no change in reflected frequency, but depend of frequency (wavelength) you can expect some changes in phase and polarization of reflected wave.

2. It is not clear if you asking for frequency range of soil (earth) or frequency range of Earth (our planet)? Soil is not unique matter so its frequency range cannot bi expressed in one single frequency. Earth specific frequency was given already by Nikola Tesla in his energy "teleportation" patents and experiments and it is about couple of Hertz.

3. UKW (MHz) range of frequencies is relatively poor penetrator in sol, in comparisons to VLF, but is still usable (as compromise between penetration and portable and directive antennas constructibility) in GPR devices.

If you need deep soil penetration then use frequency of about 2kHz, but you will lose sensitivity to small things like tiny gold nuggets.

But probably you know all this.

[epitopios]

One Tx antenna. I want to construct the pattent No US4079309.

Regards

Dear Geo
Have a look for 2 Schematics ( I have made them) they work just fine separately !!
I didnt try them to to cooperate together
maybe they will help you !!
VLF Transmitter : http://postimg.org/image/58d44lkpv/
Tracer Receiver : http://postimg.org/image/t23g3xo8n/
and pay attention what WM6 said : If you need deep soil penetration then use frequency of about 2kHz, but you will lose sensitivity to small things like tiny gold nuggets.
( if you use a crystal about 10 Mhz at Q12 :4096 for 4060 it will gives you a Frequency about 2Khz !!!
Regards epitopios and .... 73s

[liubing]

Do not understand what you are doing? Signal generator or LRL detectors?

[goldfinder]

Those "fakes" are really noce signal generators

Just a quick note. Those frequency generators are rejects. They did not pass the quality standards. You pays your money and you takes your chances.

Mike - you must be selling signal generators and don't want any competition. Those so called "fakes" as you have labeled them are state of the art. Better than any I have seen for 100s more. Very reliable, accurate, nice display - can't beat them for the money. They just don't come in a nice case but are a bare bones circuit board with and well done electronics and computerized controls.
Goldfinder.

[Geo]

Dear Geo
Have a look for 2 Schematics ( I have made them) they work just fine separately !!
I didnt try them to to cooperate together
maybe they will help you !!
VLF Transmitter : http://postimg.org/image/58d44lkpv/
Tracer Receiver : http://postimg.org/image/t23g3xo8n/
and pay attention what WM6 said : If you need deep soil penetration then use frequency of about 2kHz, but you will lose sensitivity to small things like tiny gold nuggets.
( if you use a crystal about 10 Mhz at Q12 :4096 for 4060 it will gives you a Frequency about 2Khz !!!
Regards epitopios and .... 73s

Hi Panos.
2Khz is not good frequency for my project because i need very long antenna.
The schema of receiver that you attached is good but not for 100Khz. It need more stages so to keep the same gain (100 for every op.amp).
Regards

[liubing]

GEO Hello, you're doing LRL do?

[mustefa ubram]

2Khz is not good frequency for my project because i need very long antenna.
Regards

hi geo.
You can use the electromagnetic antenna in outpou amp or use loop antenna.It does not take a very long antenna.It is suitable for the detection of frq 50 hz to 500kh .
50hz for very deep and big goals and 500kh for normal deep and big or small goals.I built a transmitter and receiver, and it works well.I used the antenna coil. I receive signals from a distance of 50 meters.I have not yet tested for metals., But I believe that this method is effective.my transmitter working in 4.5kh
G.L

[mohandes]

If one need a 70kHz transmitter with exact frequency, I suggest this solution:

1.
Use this module from eBay ($38 + free shipping):

0.01- 5MHz DDS Function Signal Generator Module

http://www.ebay.com/itm/0-01-5MHz-DDS-Function-Signal-Generator-Module-Wave-New-/270864768941

2.

Signal generator has enough amplitude to act as transmitter you need, but if you insist that you need more power, then connect signal generator to this module from eBay:

Mono 25W Audio Amplifier Module Board, Based on LM1875

http://www.ebay.com/itm/Mono-25W-Audio-Amplifier-Module-Board-Based-on-LM1875-/400244737945?pt=US_Home_Audio_Amplifiers_Preamps&hash=item5d30720799

Do not drive it with full power - 1/10 of max power, no more.

Inductance of antenna (ferrite core or air core - the last one is better) have to be about 50mH. Exact value depend of antenna windings stray capacitance. You need to connect antenna instead of loudspeaker.

Of course this transmitter can generate any other arbitrary frequency too (for some very different antenna inductance need to be recalculated).

Use sine wave.

thanks
i just need for Amplifier circuit to add signal generator.
if you have Golden king circuit please send here
regards