MINEORO 2008 MODS.

[abdou2014]

Thanks Geo

[folharin]

greetings to newbies

[abdou2014]

I built a new loop antenna for my mineoro, 494 mH I know it's too much but for VLF reception, I don't know the best is a large inductance with parallel picofarade or a medium inductance with parallel nanofarade ???

[abdou2014]

2 mH according to Mr Geo it is not for a VLF reception , on what frequency does the antenna resonate with 2 mH ????

[Geo]

Depended of the tuning capacitor.
A total capacitance of 500pf and an inductance 2mh gives a frequency near to 100Khz.

[abdou2014]

Thank you very much

[ishtar hunter]

FG90

The antenna loop

Hi dear Geo .
Do you can help me about mineoro FG90 device?
I need the information of these two ferrite cores.
The infrared receiver of my device is defective, what type of infrared should I use instead?

https://s6.uupload.ir/files/img-20211110-wa0012-1_vzo6.jpg

<a href="https://uupload.ir/view/img-20211110-wa0012-1_vzo6.jpg" target="_blank"><img src="https://s6.uupload.ir/files/img-20211110-wa0012-1_vzo6_thumb.jpg" border="0" alt="آپلود عکس" /></a>

[Geo]

Ferrite core of magnetic receiver is IP6 / 2000 (potcore).
I have n't details of the other ferrites back of the ion chamber.
FG90 has n't IR receiver

[Geo]

front side....

I decided to replace the "electric" receiver.
I new one with more than 120db gain is ready. Now i try to fix it inside the new case.

[abdou2014]

i have this schema but you made some mod , can you give info ?

[Geo]

Nothing special. One more filter for 40Hz and up!!!

[abdou2014]

i need details about input, there ara two 10M and Pot , how its connected ?

[Geo]

One antenna for every input. Potentiometer was only for the test.

[abdou2014]

i tried it with original schema and esteban pcb and don't work for me

[Geo]

For me works ok.
I need best weather to fine adjust it....