Franco's LRL ver_4046

[Geo]

not yet George, but I think this antenna (80 turns) is more sensitive than the 35 turns antenna.
The reference for sensitivity, is the whip (stylus) antenna , but this does not mean that the "stylus" is always the choice.
Besides sensitivity, there are some other properties ,(varying among antenna types), which are sometimes more favorable.

ok Billy, inform me!!!

[enjoykin4]

Mr. Geo thank you for your OWON oscillograms !!

I was currently doing modifications according to Signore Franco post #47.

Have eliminated C3, TR1 (BC170A) and P2(precision trimmer 1K 25turns) and have connected pin 4 (VCO out) and 3 directly to C8 (1pF) - but the first results are zero - not get correct operation of LRL when i have touch the antenna. Currently working is at this way - when i touch the antenna: If the LED is on stay on - if LED is off stay off.

I suspect on big ammount of VCO signal going through C8 (1pf) and C9 (1pf) to mixer stage.

I will do some experiments and draw oscillograms from my PLL4046 LRL

Thanks for cooperation.
Regards Enjoykin4

[FrancoItaly]

Hi All,
To the collector of TR 4 there is a distorted waveform, the signal at the base of TR2 is too large, or there is too much amplification.
Best Regards

[enjoykin4]

Thank you Signore Franco !!

What is a best way in your oppinion to precise regulate VCO output voltage from max to 0 - which going directly from pin (3,4 CD4046) to coupling capacitor C8(1pf)-C9(1pf) in my case its U= 6.4Vpp , F= 1.8MHz.

Keep experimenting further !!

Best Regards
Enjoykin4

[FrancoItaly]

Hi enjoykin4,
You have to control the amplitude of the signal at the collector of TR4, it must be undistorted, if so add in series to a capacitor C8 of 1pF or less, or remove C8 and C9 and weld a piece of wire on the basis of TR2 (about 10cm) , it acts as an antenna, so try the position where there is a good signal on the collector of TR4.

Best Regards

[enjoykin4]

Thank you Signore Franco !!

I will try tonight - but the adjusting feedback with a piece of wire is extremely hard and complicated. For full scale signal 0-6Vdc output at collector T4 (pointX) I need to find correct value for capacitance in femtofarads.

in any case thank you for your advices and good wishes.

Tell me does all oscillograms which Geo has posted are correct except distorted waveform at collector Tr4 (last snapshot) ?

with respect
Enjoykin4

[Geo]

Another problem is that 4046 emmits a very strong signal that it is very difficault to isolate it from input of Tr2.

Franco, thanks

[FrancoItaly]

Hi enjoykin4 and Geo,
Other oscillograms are correct. I have build 2 4046 lrls with no problems, but I must admit that it is critical amplification of 3 stages (TR2-TR3-TR4). If is too much we may have auto-oscillations, if it's too little gain the lrl doesn't work. The quartz lrl is better to build because the signal from oscillator is few volts and it's a sine curve, a square wave has a lot of armonics. You can try to shielding the 4046 and to use a passive low pass filter at pin3-4, type resistance/capacitance.

Best Regards

[enjoykin4]

Hi signore FrancoItaly and Geo

New Sunny day - New PCB layout for FRANCO-PLL4046-LRL.


Geo PCB layout redesigned by Enjoykin4. (Something from UHF design -massive ground coupling with guard rings enclosed every soldering point.





PS:Signore Franco and Geo

Any info about distances of possible detected golden and silver targets with yours PLL4046 LRLs on real fields ??
From 0 meters up to xxxx meters ?

Best Regards
Enjoykin4

[FrancoItaly]

Hi enjoykin4,
Very good work for your pcb, regarding the distances on real field I can not say more than what I said at the beginning of the thread, the performance of quartz and 4046 lrl are similar, in my test field 5 silver coin (if I remenber well) at about 2.5m. Unfortunately, it is more than a year since I've been in a real field.

Best Regards

[enjoykin4]

Hi FrancoItaly !!

Signore Franco if you have some spare time why don't you start new thread - new project - Differential frontend LRL by FrancoItaly - try boost distances and sensitivity on a real field ? We can talk about many different concepts and designs !! My idea is simple - use differential input configuaration with two antennas in antiphase (180 degree shift ) or use quadrature concept - four antennas (plates) in quadrature phase (90 degree shift) - every with own sinus oscillator adjusted separately and two independent LF modulators with variabile attenuators at outputs.

What do you think about som kind of "GOLD signal" envelope modulation with LF oscillator ?? Similar concept like in many Mineoro designs ?

Maybe we need find some particular harmonics of Gold irradiation process by planetary Scalar emmision ??

Best Regards
Enjoykin4

[Geo]

Hi.
I just returned from Italy and hope soon to make a real test to PLL version and to Xtal version.
After it will give more attention to xtal version because it works better, has clear oscillographs and no oscillations.

Regards

[FrancoItaly]

Hi All,
It is very easy to add the TR5 stage (quartz version) to 4046 lrl, in this way it is possible to compare phase and amplitude changes, I did this to try to get some sort of discrimination, but it was not possible to prove it on the field with different types of metals. It is also useful to be able to measure the DC signal for the tuning of the LRL.
Regards

[Treasureshunter]

Hi my friend
Sorry .i don,t speak english. Very nice
You build wich pcb?
Please give here pictures for your kits
I need pcb and place mr franco lrl
Ver 4046
Tanck,s

[Treasureshunter]

Mr reza vir com on here???!!!....
He,s from iran .and me too
Mr reza can help me?