IDX-PRO+VDI

[Davor]

On the contrary, IDX sound is just right, and TGSL might need some tweaking into a more linear response. Both rigs may benefit from a more elaborate compression stage in GB channel.

[ashefr10]

so it should be possible to use the audio portion of tgsl and adapt to idx of the floor that can output the audio sound when a clear deep targets.

[ossamaussama]

idx need bypass filters across supply tracks and near lf347

i think audio stage need modify to hear weak signal caused b deep target

[ashefr10]

For making the idx and tgsl with double coil D I think the TGSL a clearer sound than the idx. idx to the slow response and the sound is less clear, however I find indoor tests seemed net but in real sound is moin net my TGSL

[ossamaussama]

hi every body
i test idx in ground it have good ground balance in bad ground it is stable
and i found that change c10 and c8 to 3.3 uf electrolyte capacitor slow down the device but increase detection distance

[golfnut]

Was looking at the occasional chatter / motorboating I get on the IDX.

If you spice the Filter amps after the mixers/synch detectors , the signals at the output of the filter amps have output phases greater than -180degrees whilst there is still lots of gain available.

So it appears clear that stability issues should be a problem at around 8Hz and they are.


I looked at a similar topology that could be wire modded on an IDX board, this topology has about 30 degrees phase margin, whilst there was lots of gain available, so this would be stable and not chatter - ptoentially.

[golfnut]

Was looking at the occasional chatter / motorboating I get on the IDX.

If you spice it, the output phase is greater than -180degrees whilst there is still lots of gain available.

So it appears clear that stability issues should be a problem at around 8Hz.


I looked at a similar topology that could be wire modded on an IDX board, this topology has about 30 degrees phase margin so would be stable and not chatter.

cant see how to upload a zipped folder?

S

[golfnut]

These speakers have a mylar cone and will take water splash.

Conventional paper cones turn to mush.

S

[ashefr10]

my speaker is waterproof

[ashefr10]

Hello , for power and for coil http://www.loisirs-detections.com/fr...reign-266.html

[smity]

ashefr10 if it starts to rain, the water will flow directly into the speaker?

[gtdavid]

What fitting did you use for the length adjustment?

[ashefr10]

hello, here is the front of my idx pro and a picture of the complete assembly

[Aiko]

Many thanks for the explanation guys

[Qiaozhi]

Guys, I have build two coils - one concentric and one double D. On the concentric I have 90 degree phase shift, but on the DD coil I have 180 degree shift. Is it normal? I suppose this comes from the construction, because all parameters of both coils are identical. Both coils works similar on depth and discrimination and the VDI numbers on identical targets are very close. I am confused how this detector works almost identical with 90 and 180 degree phase shift.

This is normal. The phase-shift between TX and RX depends on the coil construction. If DD and concentric coils are constructed for a particular detector using the same TX and RX inductance values, they will be 90 degrees out of phase with each other. This is discussed in ITMD on page 132 of the Coils Experiments chapter.

The correct phase-shift is important, otherwise the detector may not be able to ground balance, and the discrimination settings will be offset from their correct positions.