AV multiband VLF receiver

[fmnotes]

FRIEND YOU CAN SEND TO ME THE FILE FROM THE SOFTWARE THAT YOU DREW THE PCB, FOR BETTER AND WHO CLEAN PRINTING, FOR THE CREATION OF PCB.
I THANK

[fmnotes]

HELLO.
WE CAN IN THIS DRAWING CONNECT Frequency Counter OR OSCILOSCOPE?

IN ORDER TO WE MEASURE THE FREQUENCY OF RECEPTION OF SIGNAL.

IF WE CAN, IN WHO POINT OF PCB THEY IS SUITABLE TO CONNECT HIM?

[gold24h]

very interesting

this is an interesting idea,i have some questions,which capacitor is selected for elf,such as 30 hertz,also how would you use this setup,are you looking for a drop in signal or an increase in signal,also there should be a way to filter out the 50 or 60 hetz utility signal from powerlines,that would make it a perfect elf receiver,i would like to experament with this but i do not understand how to use it,does treasure increase the signal or decrease it,is magnetic direction inportant also.

[fmnotes]

this is an interesting idea,i have some questions,which capacitor is selected for elf,such as 30 hertz,also how would you use this setup,are you looking for a drop in signal or an increase in signal,also there should be a way to filter out the 50 or 60 hetz utility signal from powerlines,that would make it a perfect elf receiver,i would like to experament with this but i do not understand how to use it,does treasure increase the signal or decrease it,is magnetic direction inportant also.

HELLO.

I WANT TO MEASURE THE FREQUENCY OF RECEPTION [WITH A FREQUENSY COUNTER OR ONE PERMANENT PLACED ON THE DETECTOR PORTABLE OSCILLOGRAPH], BUT BECAUSE NO AND THE FORCE OF SIGNAL (WITH UA METER)
EXISTS SOME IDEA THAT WE CAN HIM MANUFACTURE THIS, AND IT WORKS WELL, AND REGULARLY.
I BELIEVE THAT AS LONG AS WHO NEAR YOU ARE IN THE TREASURE SO MUCH WHO POSSIBLE THEY IS THE FIELD THAT CREATES THE TREASURE.
I WAIT FOR TO SEE THOUGHTS THAT WE CAN UPGRADE HIM.

I THANK

[WM6]

,i would like to experiment with this but i do not understand how to use it

.

As already described TX RX configuration can work on 3 way:
Here presented graphically:

[fmnotes]

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

[WM6]

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

If you are not willing to stay with cheap solution, you can ad frequency meter too. No problem.

Here LED diodes work as some sort of uA meter. But if you wish you can connect VU meter too.

[fmnotes]

FRIEND YOU CAN SEND TO ME THE FILE FROM THE SOFTWARE THAT YOU DREW THE PCB, FOR BETTER AND WHO CLEAN PRINTING, FOR THE CREATION OF PCB.
I THANK

If you are not willing to stay with cheap solution, you can ad frequency meter too. No problem.

Here LED diodes work as some sort of uA meter. But if you wish you can connect VU meter too.

I WANT WE MAKE HIM WHO MULTIFUNCTIONAL THE MANUFACTURE,
MY OBJECTIVE THEY IS NOT CHEAP, THEY IS IT BECOMES WHO EASY THE RESEARCH ALSO WITH MORE PRECISE.

THAT IS TO SAY IF IN THE PLACE THE LED I ADD A OSCILLOGRAPH, IT WILL SHOW ME THE FREQUENCY RECEPTIONS?

[WM6]

THAT IS TO SAY IF IN THE PLACE THE LED I ADD A OSCILLOGRAPH, IT WILL SHOW ME THE FREQUENCY RECEPTIONS?

No. Tank circuits (changing in steps) are wideband. There is some sense to connect spectrum analyser to RX tank circuit only. Oscilloscope will show you only mess of frequencies. Replacing LED-s by scope is nonsense.

There are other way if you wish to select / tune to only one RX frequency. You do not need to ad scope or f-meter.

[fmnotes]

No. Tank circuits (changing in steps) are wideband. There is some sense to connect spectrum analyser to RX tank circuit only. Oscilloscope will show you only mess of frequencies. Replacing LED-s by scope is nonsense.

There are other way if you wish to select / tune to only one RX frequency. You do not need to ad scope or f-meter.

He suggested IE, NOT REPLACE LED,
AND DO NOT NEED SOMEONE TO EXIT Oscilloscope FOR BEST RESEARCH TREASURE.
AND IF YOU DO WANT TO SET IN A FREQUENCY RECEIVING.
WHAT CAN I DO TO PLAY WITH IF THE VALUE capacitors?

[J_Player]

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

See below for a way to connect a meter to show the strength of signal.
You can change the value of R4 to make a good match for your meter to show the strength of signal.
The meter shown is 1ma, but you can use other meters with different value of R4.

Also you can connect frequency meter or oscilloscope to watch wonderful gold signals and other signals in the same place where new meter modification was placed.
You can measure oscilloscope signal from top of R4 to ground, or from base of Q2 to ground.

For me, I believe this is a good way to waste many hours watching crazy mix of signals on oscilloscope or with a spectrum analyzer.
But maybe I am wrong and you will find the elusive gold signal which no LRL experimenter has been able to describe.
Maybe you can find diamond signals too.
Who knows?

Best wishes,
J_P

[fmnotes]

See below for a way to connect a meter to show the strength of signal.
You can change the value of R4 to make a good match for your meter to show the strength of signal.
The meter shown is 1ma, but you can use other meters with different value of R4.

Also you can connect frequency meter or oscilloscope to watch wonderful gold signals and other signals in the same place where new meter modification was placed.
You can measure oscilloscope signal from top of R4 to ground, or from base of Q2 to ground.

For me, I believe this is a good way to waste many hours watching crazy mix of signals on oscilloscope or with a spectrum analyzer.
But maybe I am wrong and you will find the elusive gold signal which no LRL experimenter has been able to describe.
Maybe you can find diamond signals too.
Who knows?

Best wishes,
J_P

IN I THANK FOR YOUR ANSWER, AND FOR YOUR HELP WE UPGRADE THIS RECEPTOR.

[fmnotes]

HELLO.
MANUFACTURED HAS SOMEBODY THIS MANUFACTURE?
I I FINISHED HIM YESTERDAY AND HAVE PROBLEM.

IT DOES NOT HAVE BY NO MEANS SENSITIVITY.
IN ORDER TO IT TURNS ON THE LED IT SHOULD YOU LEAN THE GENERATOR OF FREQUENCIES IN THE KERAIA.GIATI?

WHEN WE OPEN THE RECEPTOR THE GREEN LED IT SHOULD IT TURNS ON?
WHO KNOWS YOU HELP ME

[WM6]

I do not understand you very well, but:

Nothing can happen without incoming signal.

You can get incoming signal from existing (military etc.) signal transmitter or from your own VLF signal transmitter (TX).

You need to know frequency of those VLF transmitter (TX) and select on your VLF receiver (RX) proper band by C selection switch.

Of course you can test your VLF receiver (RX) by usual signal generator. In this case you can one old relay and connect inner coil of relay to output of signal generator (or audio oscillator). Put coil near to your RX antenna and try to find signal by switching to different capacitor. If nothing happen then you need to check if one of semiconductors (in first line D7 and Q1, Q2, Q3) has gone. And check voltages if exist.

[J_Player]

HELLO.
MANUFACTURED HAS SOMEBODY THIS MANUFACTURE?
I I FINISHED HIM YESTERDAY AND HAVE PROBLEM.

IT DOES NOT HAVE BY NO MEANS SENSITIVITY.
IN ORDER TO IT TURNS ON THE LED IT SHOULD YOU LEAN THE GENERATOR OF FREQUENCIES IN THE KERAIA.GIATI?

WHEN WE OPEN THE RECEPTOR THE GREEN LED IT SHOULD IT TURNS ON?
WHO KNOWS YOU HELP ME

The purpose of the green LED is to show when there is a signal detected from the receiver.
If you turn on the power and a signal is received from the antenna, then the green LED will turn on.
Stronger signal will cause brighter green LED.
The other LEDs also show strength of signal when power is turned on, or meter can also show signal strength.

These LEDs do not show what frequencies are received.
They only show the strength of the signal.
The frequency received can be selected by using the switch to select capacitor C1 to C5.
These capacitors will adjust the resonant frequency of the ferrite antenna to make resonance for only one frequency.
But if you connect an oscilloscope, you will see there are other frequencies present in smaller strengths than the resonant frequency.

The circuit is a very simple radio receiver for detecting VLF signals at the location of the ferrite coil.
It is a wideband receiver which has the bands divided into 5 different bands.
It can receive various frequencies within the range that is selcted by the capacitor switch.
This is designed to be a simple and cheap way to build a receiver that can be used to experiment with radio waves passing through the ground to locate buried things.
It is not designed to be a sophisticated narrow band receiver with special signal processing.

I did not build this receiver circuit.
The instructions I make are only from looking at the circuit to see what is the intended function.
If you make an error in the wiring, then this circuit will not work correctly.
Also, you may need to adjust the values of the resistors or capacitors for best performance.
Some of the components will not have the exact values you see marked on them.
This is not a problem, but it can cause slight difference in the expected frequency.
You will see that the 10k value I show for R4 modification will give maybe only half of the meter movement.
You can reduce the value of R4 modification to maybe 8k or 5k to send a stronger current to the meter.
Or if you use a meter that moves full scale at a different current than 1 ma, then you will need to change the resistor R4 to make a good reading when you are detecting a strong VLF signal.

You can test to see if your receiver is detecting a signal by using a signal generator connected to a loop of wire 10 or 20 cm diameter with 10 turns of wire.
Any wire thickness will work ok.
Then turn on the signal generator and make a sweep of frequency that your receiver is tuned to receive.
The receiver should be placed a short distance away from the coil of the signal generator, maybe 1-3 meters distance.
When the receiver is set to C4, you can sweep the signal generator from 3KHz to 30KHz.
You should see the green LED and the other LEDs become bright.
When you move the receiver away from the signal generator, then the LEDs should become less bright.
If you use the meter modification, you should see the meter is stronger when the receiver is moved close to the signal generator.

You can also test other frequencies by sweeping the signal generator at these frequencies when the receiver is connected to different capacitors.

C1 -- sweep signal generator from 3Hz-30Hz
C2 -- sweep signal generator from 30Hz-300Hz
C3 -- sweep signal generator from 300Hz-3KHz
C4 -- sweep signal generator from 3KHz-30KHz
C5 -- sweep signal generator from 30KHz-300KHz

If the receiver is wired correctly, then you should see some signal when the signal generator is turned on.
I do not recommend connecting the aerial antenna.
This kind of antenna does not work well for receiving signals in the range from 3 Hz to 300 KHz which the receiver can receive.
The ferrite antenna should work very well.

Best wishes,
J_P