PD Discussions

[Morgan]

Hi mehdi
At the first, Also I didn’t believe LRL detection until when found some rusty
Nails with my long range locator !!!!!!!!! ., I believe there are phenomenon and energy filed around long buried metals now .

Hi

I remember Esteban told he found iron fragments from old fence when test his PD. He told to avoid this sensitivity to rusty iron need to increase the resonating frequency. This will make the PD less sensitive to iron,i supose you found the iron with your PD prototype.

Regards

[aft_72005]

Hi

I remember Esteban told he found iron fragments from old fence when test his PD. He told to avoid this sensitivity to rusty iron need to increase the resonating frequency. This will make the PD less sensitive to iron,i supose you found the iron with your PD prototype.

Regards

Hi Morgan
Thanks for your attention . Yes, I remember what's Esteban said .
But my real LRL wasn't Alonso PD clone . It is other PD………
About my Alonso clone PD , it is working ,detect 17 inch computer CRT screen from 1.5
Meter !!!!!. It is working very stable on the workbench , but problem when test on the ground , it is instability , must be re tune it
And this is problem . also I think there are this instability in original Alonso PD
what is your opinion??????
Best regards.

[Geo]

Before 2 months i made some modifications to my PD.
Results...... Very very stable and no Sky-ground effect.
All the story is the right null of the Rx coil.

Regards

[aft_72005]

Before 2 months i made some modifications to my PD.
Results...... Very very stable and no Sky-ground effect.
All the story is the right null of the Rx coil.

Regards

Hi Geo
Please more explain……. For how long time duration stable on over ground????
My opinion is period of retune while search area.
With your set null please say, what is detection range for 1.5 volt battery
Short circuit ?, what is detection range from TV ?
Best regards.

[WM6]

Before 2 months i made some modifications to my PD.
Results...... Very very stable and no Sky-ground effect.
All the story is the right null of the Rx coil.

Regards

Hi Geo

Probably you put device on OFF position?

[Geo]

Hi Geo

Probably you put device on OFF position?

..... very clever

[Geo]

Hi Geo
Please more explain……. For how long time duration stable on over ground????
My opinion is period of retune while search area.
With your set null please say, what is detection range for 1.5 volt battery
Short circuit ?, what is detection range from TV ?
Best regards.

Hi aft.
About stability over the ground......more than 15minutes without retuning.
The short circuit test is not good for me. When PD works as double detector (omega + passive receiver) it detects the battery spark only from 20...30 cm. When it is at ferrite mode then it detects the battery spark from 90...95 cm and the TV-on from 5meters. But this is not a test that means anything......

Regards

[aft_72005]

Hi aft.
About stability over the ground......more than 15minutes without retuning.
The short circuit test is not good for me. When PD works as double detector (omega + passive receiver) it detects the battery spark only from 20...30 cm. When it is at ferrite mode then it detects the battery spark from 90...95 cm and the TV-on from 5meters. But this is not a test that means anything......

Regards

Thank you Geo
Other question ,
When MD with ferrite work , what is detection range for 1 euro coin?
Best regards.

[mehdi]

Hi mehdi
At the first, Also I didn’t believe LRL detection until when found some rusty
Nails with my long range locator !!!!!!!!! ., I believe there are phenomenon and energy filed around long buried metals now .

Hi my dear friend thanks
i sent to you a PM, please see that and reply to me.

all the best
mehdi

[Geo]

Thank you Geo
Other question ,
When MD with ferrite work , what is detection range for 1 euro coin?
Best regards.

As lrl i did not found a euro coin. Now as MD... about 18cm (averange) depended of how critical is adjusted. I can say that it can detect the euro coin betwen 16 and 20 cm.

Regards

[aft_72005]

As lrl i did not found a euro coin. Now as MD... about 18cm (averange) depended of how critical is adjusted. I can say that it can detect the euro coin betwen 16 and 20 cm.

Regards

Thank you Geo , yes, if we set TX/RX coils as un tune mode ,
We reach to extra stability , but big problem here ,lose high sensitivity.
Therefore it didn't act as LRL !!!!!!!
Best regards.

[Geo]

Tx,Rx coils must be very close tuned......

[aft_72005]

Tx,Rx coils must be very close tuned......

Hi Geo
Stability and high sensitivity relation together is reverse, when more stable
, lose sensitivity and if we need high sensitivity , also we having instability .
Art is here " design high sensitivity with stability "
I am sure also there is instability at original Alonso PD.
I thinking solve problem in other way ……..
Best regards.

[Geo]

Hi Geo
Stability and high sensitivity relation together is reverse, when more stable
, lose sensitivity and if we need high sensitivity , also we having instability .
Art is here " design high sensitivity with stability "
I am sure also there is instability at original Alonso PD.
I thinking solve problem in other way ……..
Best regards.

Hi Aft.
Oscilator is very stable. If you connect a frequency counter (first you must modify the oscilator a little so to give sine waveform) you will see that the drift is about 10Hz in 30 minutes. The main reason of instability is the bad power supply at some stages. I connected a 6 1/2 digits multimeter to understand the problem. Original Heathkit MD was very instability as Qiaozhi said.

Regards

[aft_72005]

Hi Aft.
Oscilator is very stable. If you connect a frequency counter (first you must modify the oscilator a little so to give sine waveform) you will see that the drift is about 10Hz in 30 minutes. The main reason of instability is the bad power supply at some stages. I connected a 6 1/2 digits multimeter to understand the problem. Original Heathkit MD was very instability as Qiaozhi said.

Regards

Hi Geo
Yes, thank you for your guide , I know very well heatkit GD 348 problems
I never see and never work with original heatkit GD 348 . all of my knowledge
From my clone circuit . I did more practical work in laboratory with it .
This is strange for me why designer ALONSO or ……. Use this type detector .
What theory and philosophy behind.?????? Instability at GD348 not produced
by frequency drift, not very Important oscillator frequency drift ,
This type detector base on amplitude changing .
Best regards.