PD schematic interpretations

[Max]

please write here your interpretations of PD schematic

my interpretation is that is made basically of 3 different circuits:

1. Heathkit GD348 MD with omega+round smaller coil, working as usual old IB VLF MD with unshielded coils and at same expected range of an IB VLF MD with that small coils

2. passive receiver circuit made around a couple of ferrite rods antenna (directive) and tuned in LF band (long waves) maybe around 60Khz, to receive some very strong LF signal like time radio station WWVB of NIST and the like

3. mixer and monostable circuit that mix output of the MD and passive receiver and then feed a 555 that controls buzzer for audible signal and led

I don't see anything else interesting

please provide your interpretation too, expecially Geo

regards
Max

[Aziz]

I suspect, the LRL rats do not want to discuss the technical aspects of it.

They either
want to discuss the discussion, that LRL's are working.
or
to discuss the discussion about so called "theories", which is in my opinion a b$ theory.

EMI noise and other noise sources are the best friends of LRL rats.

Cheers,
Aziz

[Max]

Hi Aziz,
the fact is that the schematic is quite simple so I do not understand what they mean for particular stuff we don't see in it or we miss somehow e.g. the purpose or meaning of such circuits

but lets see what they write (if they will write something...) and take a look at their interpretation of schematic if different from ours

regards
Max

[WM6]

Originally Posted by Max

2. passive receiver circuit made around a couple of ferrite rods antenna (directive) and tuned in LF band (long waves) maybe around 60Khz, to receive some very strong LF signal like time radio station WWVB of NIST and the like

regards
Max

From my point of view, they expected to get huge directivity with such construction especially with use of ferrite rods antenna. Huge directivity mean long range detection. Regretfully there are disturbing reality somewhere between.

But let them to talk correct explanations.

[Fred]

I believe someone said that the coils are not absolutely necessary but an improvement, so we could drop all the GD348 and mixer circuit, and it should still "work". That would let us with a simple passive receiver, so this must be the heart of the circuit.
Apparently the idea when tuning it is to cancel any magnetic reaction, so we end up with a receiver that detect only RF levels variations...
mmmh...No wonder it is somewhat erratic and depends on geography ...

[Max]

seems that they (LRL believers and claimers) don't wanna discuss about schematic of PD

I do not understand that, but is not a good sign about they have a better understanding of that schematic at the end of the day...

[Max]

Originally Posted by Fred

I believe someone said that the coils are not absolutely necessary but an improvement, so we could drop all the GD348 and mixer circuit, and it should still "work". That would let us with a simple passive receiver, so this must be the heart of the circuit.
Apparently the idea when tuning it is to cancel any magnetic reaction, so we end up with a receiver that detect only RF levels variations...
mmmh...No wonder it is somewhat erratic and depends on geography ...

? if the GD348 and mixer serves nothing or are not strictly necessary all the interesting part must be at ferrite: a simple passive receiver is the working LRL ???

if so it's not different from the "goldgun" AL718, that's indeed a simple passive receiver! but seems many people , even LRL addicted many times here denied the goldgun works as advertised... so I really don't understand what's so special in that schematic then or what we do not see or understand...

will be nice to hear from the LRL entusiasts about that stuff...

regards
Max

[Geo]

Do you really want to discuss the issue of PD;; How;;
I refuse to go into a debate, where you tolerate a member to cursing others; I think that you do not like.

Regards

[Max]

sure, I wanna discuss schematic here, no jokes...

so Geo, what did you see interesting in it ?

regards
Max

[Fred]

Originally Posted by Max

? if the GD348 and mixer serves nothing or are not strictly necessary all the interesting part must be at ferrite: a simple passive receiver is the working LRL ???

I Think Morgan mentioned this before, but not sure 100%...Hope he will comment too.

Originally Posted by Max

if so it's not different from the "goldgun" AL718, that's indeed a simple passive receiver!
Max

Exatly what i though.Also same a Esteban´s claims: wideband receiver, etc etc...remember ?

[folharin]

my pdk...only part ferrite

[Max]

Originally Posted by Fred

I Think Morgan mentioned this before, but not sure 100%...Hope he will comment too.

Exatly what i though.Also same a Esteban´s claims: wideband receiver, etc etc...remember ?

yes, I remember he told us many times it's wideband receiver in some cases, don't know if PD is one of them anyway cause seems ferrite circuit is tuned to resonate at a specific frequency, though will be anyway somehow "broadband" cause of lack of selectivity (it's not heterodyne receiver or pll stuff... or else, just tuned ferrite coil antenna+capacitor in lc tank so selectivity just depends on Q of the coils...)

I remember another kind of LRL where he uses tape recorder amplifier, and that's a vlf broadband receiver no dubt

regards
Max

[Morgan]

Originally Posted by Fred

I believe someone said that the coils are not absolutely necessary but an improvement, so we could drop all the GD348 and mixer circuit, and it should still "work". That would let us with a simple passive receiver, so this must be the heart of the circuit.
Apparently the idea when tuning it is to cancel any magnetic reaction, so we end up with a receiver that detect only RF levels variations...
mmmh...No wonder it is somewhat erratic and depends on geography ...

Thats true,the Passive Receiver is the heart of the circuit,and a piece of art...
The EE or entusiast who can find the way to UPGRADE this circuit, have build one powerful Long Range Locator.

[Morgan]

Originally Posted by Morgan

Thats true,the Passive Receiver is the heart of the circuit,and a piece of art...
The EE or entusiast who can find the way to UPGRADE this circuit, have build one powerful Long Range Locator.

[folharin]

omega coil ... I am still building ...

could anybody help me with the number of turns omega coil?

[Max]

Originally Posted by Morgan

Thats true,the Passive Receiver is the heart of the circuit,and a piece of art...
The EE or entusiast who can find the way to UPGRADE this circuit, have build one powerful Long Range Locator.

so you state also that the regular MD inside and mixer are not necessary; but if so, like also Fred stated, the PD is similar to the goldgun AL718, a passive receiver for vlf signals, just seems PD operate above 30KHz at around 62KHz (so in the LF band, long waves)

can you confirm that ?

regards
Max

[Morgan]

Originally Posted by Max

so you state also that the regular MD inside and mixer are not necessary; but if so, like also Fred stated, the PD is similar to the goldgun AL718, a passive receiver for vlf signals, just seems PD operate above 30KHz at around 62KHz (so in the LF band, long waves)

can you confirm that ?

regards
Max

for the LRL work, you only need Coil or Ferrite,Passive Receiver circuit+Alarm circuit+Voltage Regulator=PDK project ,this is the easy way to build one LRL

The PD,also work,but is not AUTOMATIC,and is the hard way to build one LRL...

[fakhr]

Hello dear members, I am a newbie and ten years of trace metal detector and did not speak English but who am I annoying you and wasting your time, and I'm sorry the percussion alone, I could have a few years of the twenty-Si detector and metal detector machine to do it and if I find a Persian language and he would be willing, I'd love to work with him and happy sheep

[michael]

Originally Posted by fakhr

Hello dear members, I am a newbie and ten years of trace metal detector and did not speak English but who am I annoying you and wasting your time, and I'm sorry the percussion alone, I could have a few years of the twenty-Si detector and metal detector machine to do it and if I find a Persian language and he would be willing, I'd love to work with him and happy sheep

Hi Fakhr, I sent you a PM. read it and reply.
Regards.

[detectoman]

hi cangrejito i like a see this book brasileiro- tortugueise in my bandeja de entrada, mail, bye bye

[liubing]

I did a PD detectors can only detect the magnetic field of the metal is not reflected in the so-called remote detectors, LRL, PD, are deceptive tricks, we do not have to study, I was doing PI detectors, hope interested friends together to exchange

[Constantin]

[IMG][/IMG]

Perhaps this drawing can help in determining the coils value.
Sorry for my English.