TGSL coil help needed

[dbanner]

Nulling Rx is easy. Just connect Rx wires to scope( don't connect Rx coil to circuit, just ONLY to the scope)
Looking at scope for minimum Rx signal(while adjusting Rx coil in coil shell). This is your nulling point. The coils are now balanced. Go and fix Rx coil in place( leaving some small section which overlap the tx unfixed to play with later on)
Now connect rx coil to circuit(remember to have corrected values for capacitor for Rx coil). You should be getting beep with metal targets.
Only now you move on to final stage.
I await your progress.

[Gwil]

It's interesting that Qiaozhi says that "You will have major trouble trying to ground balance the detector if you reduce the null signal to zero." (See thread "Raptor RX coil and phase shift")

[dbanner]

It's interesting that Qiaozhi says that "You will have major trouble trying to ground balance the detector if you reduce the null signal to zero." (See thread "Raptor RX coil and phase shift")

This is seemingly correct. The initial nulling is done to secure the coil in place, then fine tuning afterwards can be done by manipulating small section of Rx coil which was left unsecured for playing around.

[MartyJ1963]

@Dbanner,,,,Thanks for the tips above on 'Coil nulling',,,,I've taken notes and it's a great help. Regards,,,Marty

[dbanner]

It's interesting that Qiaozhi says that "You will have major trouble trying to ground balance the detector if you reduce the null signal to zero." (See thread "Raptor RX coil and phase shift")

This is correct, the final balancing point of the Rx loop(tgsl) is slightly off to one side of the perfect null. There is some residual amplitude in Rx.
As I described above, null Rx to perfect null and fix in place leaving small section for playing with in order for final balancing(which is ever so slightly off to one side of perfect null)

[samsearcher]

I have my coils potted in place, with the adjustable centre section,
and can tweak that so that I can get either side of the null point, with some varying amplitude signal from pin 7 U101. I cannot really detect much difference if the signal is under-coupled, nulled or over-coupled...... it's working well wherever I set it.... any recommendations?. The sensitivity control does not seem to make much difference either.

[kt315]

ask Hyena. he writes his TGSL coil foiled working good.

[dbanner]

KT, give it a rest. We all know that kitchen foil no goodhttps://m.youtube.com/#searchinghttps://m.youtube.com/results?search_query=tgsl

[samsearcher]

Katey, If you are referring to my 'shiny coil' it's mylar with a clear tape insulation, as already mentioned.

I was just trying to see what level of over/under or null signal amplitude was best, and I could not see much difference in detection depth....it's fully potted now and working well, with 220mV over coupled Rx signal.
Now to have a play with the Arduino program.

[kt315]

KT, give it a rest. We all know that kitchen foil no goodhttps://m.youtube.com/#searchinghttps://m.youtube.com/results?search_query=tgsl

I know this will hurt, but I always at least try to dare to be stupid


Can you please explain why is foil so bad for shielding to teach us something? You always say "its bad", but without explaining "why", its meaningless.


I tried to test this by building classic DD coil on wooden stencil to make both halves as identical as possible. Tested null and detection depth. Of course I got laud noise, because they were unshielded. Often only caused by my hand...


But then I tried thinnest kitchen foil I found and thicker (did not measure) copper tape. On the very same coils. Always was possible to null them down to 2mV (further nulling was impossible due to noise stronger than received signal) and all had exactly the same detection ability. I expected some difference like bigger residual voltage or reduction in detection depth ability, but there was nothing like that.


I really would like to understand differencies between graphite powder, Al and Cu tape, but I can not measure difference anywhere, nor difference in detection ability.


Foil is bad, because?

good. Hyena can tell us about nulling process by his videos and pics.

[lamoiz]

you do not want to understand that we are not recommended to use the foil.
with right shielding you can do a splitted out small winding and BY IT to do balance.
look pic
[ATTACH]45943[/ATTACH]

your problem people you do not want to read the forum. you just do what you want to do. in result you get the garbage.

hello KT, I no longer have enough to paint with graphite my coils support bases. So I am going to test this solution, but if it s so easy, why does the industrial coil manufacturer use carbon loaded plastics ..ect ..? do you have an answer to that?

[kt315]

you write so i am working in WHITES ELECTRONICS COMPANY. and what?? you have to use what you may use.
if you DO NOT HAVE the access to 'carbon loaded plastics' then your nice speech to me does not have an importance.

[lamoiz]

you write so i am working in WHITES ELECTRONICS COMPANY. and what?? you have to use what you may use.
if you DO NOT HAVE the access to 'carbon loaded plastics' then your nice speech to me does not have an importance.

?? but what talk? what work at whites? what are you talking about ? I'm just telling you that if this solution is good, then it's great! what is the problem?

[lamoiz]

who tested this?

[lamoiz]

[ATTACH]53701[/ATTACH]
who tested this?

so I think that shielding doesn't work. I did the test,
What is certain is that the owner of the reel, in the photo there was so much interference emi, that he himself put this poor object on the rails of a train. now it is certain, given its condition! She no longer works .
of course all this is just humor, ...