Tx and Rx coil inductance ratio

[Nandor]

Hello

Could somebody explain me how electronics engineers decide the Tx and Rx coil inductance ratio. Also why Rx coils in general have larger inductance than Tx coils,except some of the Minelab coils.
I know that Tx has to have low resistance but what is the logic behing the inductance ratio of the search coil design.

Regards

[kt315]

a coil is a transformer. do you measure inductance of power transformer coils? not. because you know that you do not need.
so why here you operate by inductance?
sorry for my english. forget inductance ratio. you must say just about the transformation ratio.



except some of the Minelab coils.

where you see Minelab stuff here??? ML must do not exist for you. we do some projects for self and ML does not help us never.
forget Minelab.

[Nandor]

Indeed it is a aircore transformer. I tried several coils for my detectors with different inductances and the Tx is very tolerant but the Rx coil is not so forgiving as the Tx. Why is that?

Thank you for the info!

[kt315]

primary you have to know good that ideal transformer is with equal windings - primary one has to be sure like secondary one,
in inductance and number of turns. just then you CAN balance it in sure zero.
anotherway you get the left phase and the left voltage on Rx.

[kt315]

i have big article of Ivan Kostin about the matter but main problem its needed in translation from russian.

[6666]

i have big article of Ivan Kostin about the matter but main problem its needed in translation from russian.

Hi KT315 I can try and translate it in google cloud translate

[kt315]

ok. try.

[6666]

Thanks KT, I can see all the content as htm page, but I can only translate half of it but no graphics, I will have another look at it tomorrow

[Nandor]

Thank you very much, gugel translate works okay!!!

[kt315]

our big and absolutely insoluble problem is people are operating by 'Ohms and L' and do not wish to operate by the transform ratio.
so we still do not have full data on all coils. people do not wish to learn what is transform ratio.
they just want to get '100 turns for TX and 250 turns for RX' (for example) level knowledge and nothing more.

[6666]

Thank you very much, gugel translate works okay!!!

Ok glad you got it to translate, I was trying via google Docs but the process was only working 50%

[Nandor]

Very interesting article, and has many good points. It even speaks about coils I have at home. The phase relation part is the most intersting I think.
Now I understand why Tesoro is less more sensitive than Whites with the same filter gain.

thank you!

[Nandor]

Try the pop-up window, mine has one. I click on ''translate'' and it appears in hungarian. I just have to scroll a bit slower so the text gets translated.
This article is very interesting!

[Altra]

Thanks KT

See attached pdf in english

[Nandor]

After reading the article there is one question that bugs me, how to decide the coils inductance?