IDX-PRO+VDI

[gtdavid]

what type of coil are you using?

[ricalbertvig]

Coil DD

[Koala]

Coil DD

What specs and size

Preforms better than my 10" DD. Can get close to your performance by tuning the RX but it then becomes unstable to use.

[gtdavid]

Yes that would be great. As I am about to build myself a dd coil.

[ossamaussama]

i have question

why when balanced detector with ferrite in all metal mode it also reject large piece of zinc ??? with discrimination set to zero

[mohandes]

Coil DD

data for coil?and the voltage of null ?

[ricalbertvig]

tx 12 laps over 22 laps 0.74 0.64 and 0.18 ... rx 255 laps null 0.64 mw

[Koala]

tx 12 laps over 22 laps 0.74 0.64 and 0.18 ... rx 255 laps null 0.64 mw

10" 27cm DD ??

[ricalbertvig]

Yes

[gtdavid]

could some one explain those coil specs to me ..
is he using multiple wire sizes for one transmit coil?

[ricalbertvig]

use two wires .. measures if a cable is thicker lower the resistance is ohm value .. if the cable is thinner the resistance is of greater value,,, so use 2 wires tx values to reach a value 1.8 ohm and 0.590 .. forgive my English .. I do not speak English

[6666]

ricalbertvig

I do not speak English

Maybe write an explanation about your coil specs in your native language and we can use google translator ?
I think laps means turns. the rx coil has 255 turns with a null voltage of .64 millivolts ?

[ricalbertvig]

hola la idea es que los ohmios y los mh de la bobina estén dentro de los rangos DE los ohmios ( 1.8 ohm y 0.590 mhz, mi rx 112 ohm) hay que usar un medidor de mh.. he usado hasta 3 medidas distintas de alambres tanto en tx como rx ... logrando igual 45 a 50 cm para una moneda... lo que he notado con mi experiencia que no importa cuantos alambres se usen en una misma bobina...he usado hasta 3... pero respetando los valores(ohm y mh) rx en y tx... lo hice asi porque no encontré los alambres acá en mi país--- la bobina DD SE PUEDE HACER DEL TAMAÑO QUE SE QUIERA...LO IMPORTANTES ES TENER A LA MANO UN MEDIDOR DE MH.. RASPAR UN POCO EL ALAMBRE A MEDIDA QUE SE VAN DANDO LAS VUELTAS, PARA ir buscando los valores de los ohm y los mh.. esto en DD NO HE PROBADO CON OTRAS BOBINAS...

[6666]

Thanks
and from google translate

Hello the idea is that ohms and the mh (of the ) coil are within the ranges of the ohms (1.8 ohm and 0.590 mhz, my rx 112 ohm) to use a meter of mh...(use a meter to measure mH) I have used up to 3 different both on tx-wire measures as rx... achieving equal 45 to 50 cm for a currency... what I've noticed with my experience that no matter how many wires are used in a same coil... I've used up to 3... but respecting the rx values (ohm y mh) in and tx... did so because I did not find the wires here in my country - coil DD can be of the size that you want to...its IMPORTANT TO HAVE ON HAND A METER to read MH... SCRAPE a little enamel off the wire to measure that is VAN (value ?) giving the turns, to go looking for the values of the ohm and the mh... This DD not have tried with other reels...

There you are gtdavid

[ossamaussama]

i have strange problem with idx dd coil

after some experiment and try many capacitor values on rx
i finally can reject frite bar with pinpoint mode and discrimination mode

after using the idx i cannot reject frite in all metal pinpoint mode
but only in discrimination mode


coil is balanced with 0 volts in digital multimeter ac

detector is working good in ground but cannot balance ground

any ideas?