Lrl from Italy

[abdou2014]

I ADDED 50Hz NOTCH WITHOUT SUCCESS TO AVOID SKY EFFECT WHY ?

[FrancoItaly]

Why put a 50Hz filter when this signal is not there? If you use the lrl in a place where there are high voltage power lines it does not work.

[aft_72005]

Originally Posted by FrancoItaly

My lrl, like the others (except for modified metal detectors like Alonzo's pistol), works only as remote sensing and for metals buried for a long time. Anomalies in detection can depend on the type of soil, metal, burial time. We know little about the phenomenon that according to official science does not exist. The advice I can give is to do tests in the test field and try to understand how it works.

Hello Franco.
Years ago... when you built remote sensing based on a separate transmitter and receiver... I corresponded with you privately... after studying your new circuit... its performance is clear. And how it detects the target...many people do not know the philosophy of revealing the phenomenon and I think it is better to keep it secret.

[FrancoItaly]

I don't remember exactly what you're referring to, but in my opinion even if there is a transmitter it still works as a passive receiver and not as a radar, in fact if that were the case the transmitted signal should reach the buried metal and then come back.

[aft_72005]

Originally Posted by FrancoItaly

I don't remember exactly what you're referring to, but in my opinion even if there is a transmitter it still works as a passive receiver and not as a radar, in fact if that were the case the transmitted signal should reach the buried metal and then come back.

Well, many people think that it has a radar function.. and The return signal is in the FM band.. Do you know about this?

[FrancoItaly]

I think the phenomenon extends from radio waves (long, medium and high) to infrared and ultraviolet. The radar presupposes a single antenna and a delay in the reflected signal, I think that adding a transmitter for example in the FM band increases the sensitivity of the TR2 mixer, but in this way makes it difficult to calibrate. I obtained a good sensitivity using a 20Mhz quartz and tuning the L1/C10 filter on a 20Mhz harmonic. for example 100Mhz (20 X 5) or 120Mhz (20 X 6). Unfortunately the tuning is very critical, out of 3 specimens only one works, the calibration with 8Mhz is already complicated but there is no problem of the harmonics, unfortunately however the 8Mhz harmonics have a level too low to be used.

[aft_72005]

Originally Posted by FrancoItaly

I think the phenomenon extends from radio waves (long, medium and high) to infrared and ultraviolet. The radar presupposes a single antenna and a delay in the reflected signal, I think that adding a transmitter for example in the FM band increases the sensitivity of the TR2 mixer, but in this way makes it difficult to calibrate. I obtained a good sensitivity using a 20Mhz quartz and tuning the L1/C10 filter on a 20Mhz harmonic. for example 100Mhz (20 X 5) or 120Mhz (20 X 6). Unfortunately the tuning is very critical, out of 3 specimens only one works, the calibration with 8Mhz is already complicated but there is no problem of the harmonics, unfortunately however the 8Mhz harmonics have a level too low to be used.

Thank you.. I will investigate further and let you know the result.