TESORO GOLDEN SABRE

[kt315]

can you film o-scope screen when your move rx or tx from on side to other so i can see phase-amplitude shift somersault?
i see just one static pic you show constantly, in every your post.

[mostafalesnar91]

can you film o-scope screen when your move rx or tx from on side to other so i can see phase-amplitude shift somersault?
i see just one static pic you show constantly, in every your post.

OK!!

[mostafalesnar91]

Does increasing c6 from 15nf to 20nf have any effect???

[Op04]

Does increasing c6 from 15nf to 20nf have any effect???

Yes it does, It will change resonance frequency related to your coil inductance, if higher from 15nf then will lowering freq

[mostafalesnar91]

can you film o-scope screen when your move rx or tx from on side to other so i can see phase-amplitude shift somersault?
i see just one static pic you show constantly, in every your post.

please help me guys!!!!

https://m.youtube.com/watch?v=uQZhZ1S9BUo

[waltr]

At bout 5 seconds in your video you had the coils NULLED.
Looked pretty good.

See how RX amplitude goes to minimum and the phase flips as you go through null.

When I pot the coil into the shell I leave the straight section of one coil unpotted. This is for final Fine Adjustment since the when the potting cures the coils seem to have moved.
Last coil I made had a fine adjustment nylon screw mounted to do final fine adjust which is only a small fraction of a mm.

As potting material I use an electronic grade two part epoxy with LOTS of micro-balloons added to reduce weight (about 50% by volume).

[mostafalesnar91]

At bout 5 seconds in your video you had the coils NULLED.
Looked pretty good.

See how RX amplitude goes to minimum and the phase flips as you go through null.

When I pot the coil into the shell I leave the straight section of one coil unpotted. This is for final Fine Adjustment since the when the potting cures the coils seem to have moved.
Last coil I made had a fine adjustment nylon screw mounted to do final fine adjust which is only a small fraction of a mm.

As potting material I use an electronic grade two part epoxy with LOTS of micro-balloons added to reduce weight (about 50% by volume).

If according to you, there are 5 seconds
at the end of the movie, then why rx and tx don't have 20 degree phase difference??
Why is the sense of metals weak in this case when the coil is nulled?

[Carl-NC]

When you are probing the RX coil signal, where are you probing? Directly on the RX coil, or at the output of the preamp?

Walt is correct, you have a good null at the 5 second mark. It doesn't really matter what the phase is at minimum null because at that point the phase is rolling around quite a bit, anywhere between 0 and 180. Once you have the null minimized, then you apply a ferrite and get the demod clock phases set properly. It's possible that if they are not set right certain targets will have a weak response.

[kt315]

why rx and tx don't have 20 degree phase difference??

do not run for the phase, you must run for right reaction on non-ferrous and ferrous metal moving above coil. a ferrite Carl meant is like 'earth/ground/sole' effect
you simulate on table. take a piece, not big and not small. experiment. you must not get a reaction/sound on the ferrite, being silent.

[mostafalesnar91]

thank you guys!!
tx only 14.46
rx only 13.86
Connect tx and rx together to circuit 14.30 and 14.20
Why rx does not reach frequency 16????
Now I have a phase difference of 20 degrees, but in pre-phase!!
But it must be post-phase, right??
how to make rx frequency to 16???

[mostafalesnar91]

thank you guys!!
tx only 14.47
rx only 13.86
Connect tx and rx together to circuit 14.47 tx and 14.37 rx
Why rx does not reach frequency 16????
Now I have a phase difference of 20 degrees, but in pre-phase!!
But it must be post-phase, right??
how to make rx frequency to 16???[ATTACH]58113[/ATTACH]

please help me

[Qiaozhi]

please help me

The RX frequency will always be the same as the TX frequency regardless of how you tune the RX coil.
Let's say the TX frequency is 14kHz, and you tune the RX coil to 16kHz. The RX frequency will still be 14kHz. All you have done is tune the RX coil off resonance.
The more you tune the RX coil away from resonance, the lower the amplitude. The frequency stays the same.

[kt315]

Now I have a phase difference of 20 degrees, but in pre-phase!!
But it must be post-phase, right??

ok. where you see '20 degrees' phase shift recommended? let to see the text.

[mostafalesnar91]

The RX frequency will always be the same as the TX frequency regardless of how you tune the RX coil.
Let's say the TX frequency is 14kHz, and you tune the RX coil to 16kHz. The RX frequency will still be 14kHz. All you have done is tune the RX coil off resonance.
The more you tune the RX coil away from resonance, the lower the amplitude. The frequency stays the same.

Now I have to set the rx to the lowest possible amplitude where the waveform changes I did this but the sense of metals was poor
Why does the shift not happen? Why is the tx waveform static when nulling and not moving left or right?

[mostafalesnar91]

Now I have a phase difference of 20 degrees, but in pre-phase!!
But it must be post-phase, right??

ok. where you see '20 degrees' phase shift recommended? let to see the text.

See the photo in the best condition for the coil!!!! This coin your country should sense in a few centimeters????