GOLD GUN AL707

[WM6]

Originally Posted by ionios

Hello WM6, is it possible for you to give us
The complete schematic for the transmitter
With the values of the capacitors .......etc.
Thank you.

This is jack's schematic not my. Ask him.

Here is my schematic (sorry I have not PCB, cause this MAX IC is not in my PCB design library):

http://www.dz863.com/drawsch_1925.html

[jack]

hi wm6
How low frequency transmitter in the ferrite?

[WM6]

Originally Posted by jack

hi wm6
How low frequency transmitter in the ferrite?

It is about properties of ferrite core not transmitter.

Ask your supplier for LF toroid of higher AL value, which are mostly manganese/zinc (MnZnFe{II}) type.

Or better: forget telescopic antenna an build simple and effective coil antenna as on my schematic.

http://www.dz863.com/drawsch_1925.html

[jack]

Originally Posted by WM6

It is about properties of ferrite core not transmitter.

Ask your supplier for LF toroid of higher AL value, which are mostly manganese/zinc (MnZnFe{II}) type.

Or better: forget telescopic antenna an build simple and effective coil antenna as on my schematic.

http://www.dz863.com/drawsch_1925.html

A transmitter circuit that put the output of IC 4060 produces very low frequency.Section shown in the picture and it only reinforces the output frequency of the rf frequency makes.
Wrapping wire on a ferrite high frequency is generated from the IC?
Or raise it?
I want to use the telescopic antenna.
In your opinion is the efficient use of telescopic antenna?Or use the antenna coil?

[ionios]

Originally Posted by WM6

It is about properties of ferrite core not transmitter.

Ask your supplier for LF toroid of higher AL value, which are mostly manganese/zinc (MnZnFe{II}) type.

Or better: forget telescopic antenna an build simple and effective coil antenna as on my schematic.

http://www.dz863.com/drawsch_1925.html

i have another question for, you in your plan were we connect the generator?
also the antenna were you have in your plan it is for air transmit,
if we like to have both air and ground what we do?
Thank you.

[WM6]

Originally Posted by ionios

if we like to have both air and ground what we do?

Nothing special, cause VLF wave penetrate very deep in ground also (without ground plane part of antenna).

You need to place your transmitter with coil antenna in air near to soil surface of about 10 meters or more from detecting place.

For better detecting you can try from different positions and different orientation of coil antenna in air (vertical, horizontal, in detecting direction, etc.).

[J_Player]

Originally Posted by ionios

i have another question for, you in your plan were we connect the generator?
also the antenna were you have in your plan it is for air transmit,
if we like to have both air and ground what we do?
Thank you.

portable VLF transmitters and receivers almost always use coil type antennas because they are more efficient than telescoping antennas. The coil type is also much more directional.
The portable telescoping antenna works poorly at VLF frequencies. The telescoping antennas are usually reserved for higher frequencies than the 30 KHz that you want to broadcast.
VLF at 30KHz will broadcast easily into the air, and will also penetrate from the air into the ground at least 10 meters deep depending on the soil. If the soil is not conductive, then it can penetrate deeper. When you make the frequency lower, then the same power of VLF will penetrate into the ground deeper. I would not be surprised if you sent signals to 50 meters using 12 KHz, but it depends on the soil conductivity and how much power you are broadcasting.
Geologists set up their portable transmitters on the ground, then they usually put a cable on the ground in a single loop that can be more than 1Km diameter to make a circle around the place where they want to locate and measure anomalies under the ground.
They want to make a very even vertical VLF magnetic field that they can walk through the interior of, and measure the variations of the field strength with their receivers.
They can detect rock formations and mineral deposits or ores and metals or tanks under the ground up to 50 meters deep, and sometimes deeper.

I think you will find that WM6 is very expert for building transmitting equipment.
And I believe WM6 is correct that you will be wise to experiment with different kinds of transmitting and receiving antenna coils.
You will find that the coils he recommends will always work better than a telescoping antenna for VLF frequencies.
You will see there is no need to put parts of the antenna under the ground to penetrate deep.
The problem will be to locate metal things that are small.
I think it will take much experimenting before you will find a good combination of transmitter and receiver to be able to detect metal things under the ground that are small enough for you to carry in your hand.


Best wishes,
J_P

[WM6]

Thanks J_P, for good explanation.

One remark: I intentionally did not gave high output power transmitter solutions to stay inside authorities regulations limits regarding EMI disturbances in RF spectrum.

At the same time, using low power TX, we can, with proper designed RX, and under proper circumstances, even sense changes in wave polarisation on short distances, which is very important to distinguish between different source and direction of received wave mess. With even slight higher power this is not possible to achieve at short distances.

RX problems and solutions we will discuss once in next year.

[J_Player]

Originally Posted by WM6

Thanks J_P, for good explanation.

One remark: I intentionally did not gave high output power transmitter solutions to stay inside authorities regulations limits regarding EMI disturbances in RF spectrum.

At the same time, using low power TX, we can, with proper designed RX, and under proper circumstances, even sense changes in wave polarisation on short distances, which is very important to distinguish between different source and direction of received wave mess. With even slight higher power this is not possible to achieve at short distances.

RX problems and solutions we will discuss once in next year.

It is important to understand that high power is not necessary to make VLF penetrate deep into the ground.
The geologists are using low power portable transmitters to measure maybe more than 40 meters deep into the ground.
They use less power than the limit for most countries.
Most people do not bury treasures 40 meters deep. Most treasures are less than 2-3 meters deep.
It is easy to penetrate to 2-3 meters with very low power VLF.
Most people who experiment with LRLs are using less power than a metal detector will use at similar VLF frequencies.

I read where many LRL experimenters say that too much power will destroy their detection.
In the case of Mineoro, the reports from the factory and users close to the factory say that if you put the power from moving a metal detector coil over a buried treasure site, you will destroy the detection for that treasure for several days.
Then you must wait a few days until the signal will return before you can locate the treasure.

The biggest problem with illegally transmitting high power VLF is you could be interfering with the submarine communication signals from large countries like Russia, USA, Canada, and many others around the world. If these countries have problems from interference, then they will find your location by using their radio direction locators.
Then they will complain to the state department for your country.
Then there is a very good chance some government officials will come to your home to confiscate your equipment and impose fines and imprisonment to you.

You must remember, these VLF signals can travel very long distances with not much power, and they can penetrate the ground and ocean water very easily.
Especially the lower frequencies. This is why submarines use VLF for secret communications.
Russia is known to operate VLF transmitters which change to different un-published frequencies without announcing when they change frequencies.
I would not want to be broadcasting a high power VLF signal that interferes with their secret military communications.


Best wishes,
J_P