IDX-PRO+VDI

[golfnut]

I experienced it unfortunately.

I noticed the gain endstopping when scoping in XY one time - Rx chain compresses like mad with a tractor wheelnut and goes non linear - the phase dexterity is lost and signals beat their way to the comparator and sound off as would non ferrous.



I was toying with the idea of a gain control (AGC) to slash the gain of the front end with large iron signals.


The Preamp could have n gain taps with cmos switches to select R's for gain -controlled from an A/D post demod.

Similar to ..



S

[szucs_g]

i have the problem with large iron objects. The Disc cracks or give some plops, but my original Mi´nelab Musketeer have this problem too. So i belive this is ok ..

I experienced it unfortunately.

[maxfly]

VDI signal creep, Help!!

I need Help with VDI adjustment!!!!


I have finally found an original Whites Blue Max 800 for IDX Pro with VDI. Everything is working fine with large coin detected at around 30cm, plroblem is that as a target gets closer to coil the VDI number creeps either up for low numbers or down for high signal with +45 being the most stable area. An AU 50c will start out at +26 and end up +45 when very close to coil. The Disc pot suffers a bit of creep but not like that! I though these problems would go away with original coil. VDI numbers start to show on screen at about half the distance that audio detection is made, is that normal?? I have scope ect for testing. nobody seems to have had this issue yet,

Thanks
Max

[Firebox]

i have the problem with large iron objects. The Disc cracks or give some plops, but my original Mi´nelab Musketeer have this problem too. So i belive this is ok ..

[golfnut]

Do other users of IDX suffer breakthru from large Iron? Small iron I gets disc'd out ok..

S

[Firebox]

My Lugatek VDI shows a ALuminium Coin with VDI +70 and Alu foil with VDI +38 - +42
My Geotech VDI shows a Aluminium Coin with vdi +55 and Alu Foil with VDI -6 - -2
My XP Deus shows Aluminium in VDI +90 - +98 Silver in +80 - +89
It would be better when both VDI shows approximate the same value.

regards

[Davor]

It is the nature of a thin foil to act as a material with very poor conductivity. This feature is your friend

[holyuser]

Is it possible to set the Aluminum oder Silver in a higher area ( for example + 85) ?

I suppose that this is not possible

[Firebox]

Hi,
i have a geotech VDI mounted on the IDX Pro. Is it possible to set the VDI Values in a higher range? for example Aluminium is detected with VDI +34 / +38, Alufoil is detected with VDI -2/+2.
Is it possible to set the Aluminum oder Silver in a higher area ( for example + 85) ?

[Qiaozhi]

IDX done by eduardo. Coil 25 cm. 1 euro 40 cm when tested in air. Switch is added for 1 and 2 tonnes. I can not insert pictures.

You need to make at least one post before you have permission to post pictures. You've just done that, so please try again.

[Mefisto]

IDX done by eduardo. Coil 25 cm. 1 euro 40 cm when tested in air. Switch is added for 1 and 2 tonnes. I can not insert pictures.

[Davor]

My future analogue VDI is now much closer to its realisation. I have a really good 2 quadrant analog divider at hand with all garden variety components.

[eduardo1979]

Eduardo1979, I would like to know. Is it correct or not?

Yes, is correct.

[Leshka]

Eduardo1979, I would like to know. Is it correct or not?

[eduardo1979]

Help.
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https://www.youtube.com/watch?v=lyg_Di3kcvU