ALONSO PD MISSION ACCOMPLISHED V1,V2

[folharin]

Originally Posted by humhum

I can't measure my setting FM receiving frequency , because it is very power low signal ,
, IF of some FM receiver is 10.7 Mhz , IF of AM receiver is 455Khz , This is after
mixing of input and local OSC , but TDA7000 not use 10.7Mhz , only few Khz .

about IF see this link :

https://www.analogictips.com/radio-r...-trf-superhet/
https://www.analogictips.com/radio-r...rt-2-zero-sdr/

exactly this point you also concluded the analysis as I arrived at this same conclusion

[folharin]

: |

[humhum]

Originally Posted by folharin

exactly this point you also concluded the analysis as I arrived at this same conclusion

You mean that , Your exactly result can't measure setting FM receiving frequency or
phenomenon ?
( because it is very power low signal )

[brasilpb]

I believe that any radio can work.

[folharin]

Originally Posted by humhum

You mean that , Your exactly result can't measure setting FM receiving frequency or
phenomenon ?
( because it is very power low signal )

exactly!

[brain]

hello i noticed that gold is sensitive between 84-86mhz on the oscilloscope screen
humhum x osilator has an effect on the phenomenon

[humhum]

Originally Posted by brain

hello i noticed that gold is sensitive between 84-86mhz on the oscilloscope screen
humhum x osilator has an effect on the phenomenon

Hi Brain , this is Very Good , peak center Freq 85 Mhz in Your Country .

[folharin]

Originally Posted by brain

hello i noticed that gold is sensitive between 84-86mhz on the oscilloscope screen
humhum x osilator has an effect on the phenomenon

and khz? already tested?

[Bhagye]

Hello dear members,

Are you talking that you measured oscillation of piece of gold, using oscope and some kind a home made circuitry?? Some one can please explain me how do you measure gold frequency with an oscilloscope??

[folharin]

no..the test is done with buried gold!

[LRLMAN]

Originally Posted by humhum

Hi Brain , this is Very Good , peak center Freq 85 Mhz in Your Country .

Hello HUM HUM thanks for the answer before my question ... and I just mentioned what is the function of an oscillator in an LRL detector ..... stimulating the receiving antenna (increasing its sensitivity) of an Lrl detector o only serve to impact a buried target of much more than yellow metal or white and generate a stimulating phenomenon surrounding this buried metal ???

And on the other hand I would like to ask you what would be the Maximum central frequency in Mhz or Khz for Mexico ????

Regards.....LRLMAN.

[Pahom]

The harmonic frequency depends on the most powerful transmitting device in the area being searched. And for this reason, the frequency is different everywhere.

[brain]

Originally Posted by Morgan

is this your DCH85 , or using other model?

What is 555 frequency?

[brain]

transmitter for What is 555 frequency?

[brain]

Originally Posted by Morgan

the Alonso PD use the metal detector circuit HeatKit, its a TR/IB sistem, according Esteban a BFO with cristal controler is the best for stability, I want to try but the cristal is hard to find...

here schematic

hello, is the morgan bfo detector sample suitable for your business?
https://www.hobby-hour.com/electroni...l-detector.php

[Jeg]

Originally Posted by Morgan

I get a coil formula for the Alonso PD passive receiver that can detect a 1,5V battery spark 2,20m distance, my question, someone here get this distance or more with the passive receiver ?

Hi Morgan
The length of cable that you make the 1,5V spark is important. Different lengths lead to different distances. I think it was mr humhum that he proposed a 60cm length as a reference. What was the length of your cable doing those measurements?

[rxlock2]

Originally Posted by Jeg

Hi Morgan
The length of cable that you make the 1,5V spark is important. Different lengths lead to different distances. I think it was mr humhum that he proposed a 60cm length as a reference. What was the length of your cable doing those measurements?

my receiver catches the 1.5 V battery spark with 30 cm cable, at a distance of 3.80 meters.
Does this mean anything on the field?
Nothing at all.

[Pahom]

There should be no cable length, but a loop in the form of a net with a diameter of 30-40cm.https://www.longrangelocators.com/fo...ad.php?t=19427

[Jeg]

Originally Posted by rxlock2

my receiver catches the 1.5 V battery spark with 30 cm cable, at a distance of 3.80 meters.
Does this mean anything on the field?
Nothing at all.

Hi
It is just a common method to compare sensitivities between devices. Nothing more.
But if it is to compare then length plays a significant role.



Thanks pahom. Very handy.



Have you tried guys to sense a piezo-lighter with your pistols? At what distance do you get the spark?


ps. By the way, rxlock...3,8m..impressive. Thanks

[Pahom]

There are many options for Jagu. With a piezo, if you do such maneuvers, then from 20 meters, you can fry the transistors on the go. They seem to work, but they are really a kerdyk. Something like this! So only 1.5 volts is just right. Thank you, THANKS!

[Hosin@2021/shahroee]

Is ferrite sensitivitie to the hand in Pd alonso?

[Geo]

If i remember right.... No.

[Hosin@2021/shahroee]

Thank you for your response mr geo .in active and passive mode (both on ) . Pd alonso how far senses a coin with a diameter of 2cm ?

[Geo]

If tuning is ok then it locates the coin near to 3m.
The basic problem is that PD is not so stable and detuned very often...

[Hosin@2021/shahroee]

Tanks for reply
In Pd alonso , detect coin in active_passive on and only active without passive is equal (test coin in air) ?
Best wishes