Lrl from Italy

[mustefa ubram]

hi franco
This is my specifications of the device:
antenna:50cm
out put voltage sensor :about 5 volt
L=3turn
c=22p & variable Capacitor
test point:100 grams of silver at a depth of 25 cm About 1 month in the soil.
I've tested in practice.Unfortunately, in practice, had no answer.
what is your opinion?

[brs]

One month is not enough after three months

[FrancoItaly]

Hi mustefa,
what kind of silver? maybe you need to wait any longer, as brs says.

[mustefa ubram]

Originally Posted by FrancoItaly

Hi mustefa,
what kind of silver? maybe you need to wait any longer, as brs says.

25pcs coin silver historical ...

[folharin]

someone test this LRL real testing ground , which result?

[Napsterce]

Hello Franco, today I tested the LRL and it gets some signal. Is it possible it is catching other side of the Earth (not north)? In the picture with dot is marked the place where i was standing and with the line the direction i was measuring and in that line all 3 leds glow even with gain at lowest level.

[FrancoItaly]

are you sure that this is not the compass effect? Have you checked with a metal detector?

[Napsterce]

I have only tested the lrl on a place where gold is supposed to be burried by the germans in ww2. From the measuring point in the direction of measurment there is old german grave but it is maybe 500 meters far. On the picture is shown the measuring position and the earth sides (red N is direction of north) and when i measure to the north the leds turn off so i dont think it is catching north. The problem is that it is catching signal at lenght of 50 meters on the red line on the pictures, if i move 5 meters to left or right the signal is weaker or gone. B.R.

[Bill512]

Originally Posted by Napsterce

I have only tested the lrl on a place where gold is supposed to be burried by the germans in ww2. From the measuring point in the direction of measurment there is old german grave but it is maybe 500 meters far. On the picture is shown the measuring position and the earth sides (red N is direction of north) and when i measure to the north the leds turn off so i dont think it is catching north. The problem is that it is catching signal at lenght of 50 meters on the red line on the pictures, if i move 5 meters to left or right the signal is weaker or gone. B.R.

my opinion is that 500 meters, or even 50 is way to much.
Probably, compass effect.
By the way, the "compass effect" direction, also determinates your primary searching direction and it's not always in North-South direction.
Furthermore, this effect has nothing to do with the magnetic field of the earth but mostly related to RF local field in the searching area.
The searching procedure , it's not easy at all.
Read again and again the instructions from Franko...

[Napsterce]

Bill512 It's all by Franco's instructions, as i said even at lowest gain it is catching the signal at that place, all the other places it doesn't catch it, even when i move from there like 10m to left or right the signal is weaker, if it is catching "compass effect" it will catch it at any place i test the lrl.

[afshin]

Originally Posted by Napsterce

Bill512 It's all by Franco's instructions, as i said even at lowest gain it is catching the signal at that place, all the other places it doesn't catch it, even when i move from there like 10m to left or right the signal is weaker, if it is catching "compass effect" it will catch it at any place i test the lrl.

Hi Napsterce
Your opinion is right,that is not
compass effect,it is maybe a big phenomenon field, therefore
You have to shorten antenna to minimum size or even remove that from the circuit box and try again at lowest gain measuring
signals to find the center of signals.

[Bill512]

Originally Posted by Napsterce

Bill512 It's all by Franco's instructions, as i said even at lowest gain it is catching the signal at that place, all the other places it doesn't catch it, even when i move from there like 10m to left or right the signal is weaker, if it is catching "compass effect" it will catch it at any place i test the lrl.

then do what afshin suggests: reduce somehow further the overall gain, gradually, and try to localise the anomaly...

[Golden]

Hi Napsterce
Nothing new ..?

[folharin]

after 8 years participating in this forum still believe in pd alonso is the best LRL this forum, may be new member not to be reliable, I am the esteban time, I know thatfranco italy do your best but do not believe this faicha 8 mhz be the way

[FrancoItaly]

Hi folharin,

you built alonzo PD? I have built many years ago but without having a good result.

Best Regards

[abdou2014]

FRANCO YOU ARE THE BEST

[folharin]

I'm working on alonso pd from 6 separate pcbs and different turns ferrite

[afshin]

Hi dear franco
If we use another transistor with the hfe=1000 and ft=200 Mhz instead of the bc183c isn't better? Doesn't the lrl work with more sensitive in this case?
Best Regards

[FrancoItaly]

Hfe=1000 is a great value, are you sure that is not darlington? if the LRL is too sensitive can self oscillates or may be sensitive to compass effect.

[abdou2014]

Mr Franco Can I Use This Transistor In Your LRL :
BC550C / Transition frequency (ft), MHz: 150

[afshin]

Originally Posted by FrancoItaly

Hfe=1000 is a great value, are you sure that is not darlington? if the LRL is too sensitive can self oscillates or may be sensitive to compass effect.

alright! Mr Franco, bravo!
that is darlington type 2N5526
http://alltransistors.com/transistor...ransistor=4951

http://www.semicon-data.com/transist...2n/2N5526.html

[afshin]

Mr Franco,bc183c ft is 150Mhz,
isn't better that we use a transistor with ft=200 Mhz and hfe=420 ? The hfe is the same value as the bc183c approximately , but the higher ft maybe better, because the frequency band is wide Compared to the previous state and the amplification will be better for the Received frequency, what is your opinion Mr Franco?

[FrancoItaly]

Yes all transistors BC....C with ft=> 150 and hfe>400 are OK.

[FrancoItaly]

I think it's possible to use transistor with ft=200 or more and only one turn for L1, but I have not tried.

[pigeon]

pcb franco