field test unit no 001 "model T"

[moodz]

Hi Moodz,

I think to truly demonstrate descrimination you should show a variety different shaped targets made of different metals and show that there is something in common with all the targets of the one metal type. I'm assuming that with this test you used two targets of indentical dimensions but differing metal types, which obviously respond differently. But that doesn't neccessarily mean you can determine the metal type or even group of metal types when you don't know the shape and size of the target.

Midas

Very true ... this version only has the one "channel" and the focus is on ground balance and sensitivity. At this stage I am not that worried about discrim ... but when I am digging deep holes I will be ... LOL. The signal processing version will have a second discrim channel. I have made this version to demonstrate superior sensitivity ( goal is > 10% depth ) and ground balance utilising a relatively simple design and lower cost utilising new PI techniques. Dont forget I am using a monocoil which is probably the most difficult to achieve any level of discrim. I wont be posting lots of target tests as they just take too long to do properly .... I am aiming to prove the performance in the field not the bench ... I have got cabin fever from being in the lab for too long.

[Midas]

Hi Moodz,

I think to truly demonstrate descrimination you should show a variety different shaped targets made of different metals and show that there is something in common with all the targets of the one metal type. I'm assuming that with this test you used two targets of indentical dimensions but differing metal types, which obviously respond differently. But that doesn't neccessarily mean you can determine the metal type or even group of metal types when you don't know the shape and size of the target.

Midas

[moodz]

OK



Moodz, IMO there is not a significant difference between the iron and copper signals you are displaying above. The large negative swing you have previously displayed in post 360 for non ferrous is not evident in this latest waveform presented????

...the correct term should be IMHO ... and yours is truly humble in this case .... because you are comparing apples with oranges. Post 360 is much earlier in the signal chain ...just after the damping magic happens .... post 555 is the audio tone envelope modulation waveform ... just after 140db of processing gain and filtering ... but prior to audio tone modulation ... look at the time bases ... 2 microseconds vs 200 milliseconds or so.
The descrim function is still in the signal chain ... the "super pro" experimental model extracts this channel separately ... post555 only shows the target channel for the "pro" experimental model and combines discrim and target in one channel for cost reasons.

[UrbanFox]

Below is the input signal to the audio modulator ...ie the output from the amps etc etc .....

OK

two identical test targets are moved across the 18 inch monocoil at 40 cm ( note the time base ... about 1 second target time ) .... iron and copper ... for comparison.

Moodz, IMO there is not a significant difference between the iron and copper signals you are displaying above. The large negative swing you have previously displayed in post 360 for non ferrous is not evident in this latest waveform presented????

[WM6]

...are you telling me you didn't get the sample unit I already sent?

No, probably you sent it over Alaska, there are terribly slow delivery?

[moodz]

More safe solution: you send me "Moodz PI model T" and I will test it on genuine Australian gold nugget.

...are you telling me you didn't get the sample unit I already sent?

[WM6]

Sure ... for long range tests I always use 1 Kg standards. I will PM address for you to mail the 1 Kg nugget. Better mail me more than 1 as they sometimes go missing in the post for some reason.

More safe solution: you send me "Moodz PI model T" and I will test it on genuine Australian gold nugget.

[moodz]

Magic. Can you show us for comparison how "gold response" perform?

Sure ... for long range tests I always use 1 Kg standards. I will PM address for you to mail the 1 Kg nugget. Better mail me more than 1 as they sometimes go missing in the post for some reason.

[moodz]

What happened that you suddenly are in a so sharing mood? I think this picture reveals a lot.

Well I cant just keep saying that it works ... but I can tell you this .... whoever owns this IP .... owns the future of PI design as it appears to bypass ALL previous art. ( might even surpass WBGB ... sorry Aziz .. Ok ... might equal WBGB ).

[WM6]

Magic. Can you show us for comparison how "gold response" perform?

[Davor]

What happened that you suddenly are in a so sharing mood? I think this picture reveals a lot.

[moodz]

A real discriminating PI. Fabtabulous!!! I couldn't see a headphone jack in the picture. Is there one?

Nice work.

Thanks.... I am rather surprised myself that I finally got round to building it ..... the headphone jack is next to the red push button see pic ...


Below is the input signal to the audio modulator ...ie the output from the amps etc etc ..... two identical test targets are moved across the 18 inch monocoil at 40 cm ( note the time base ... about 1 second target time ) .... iron and copper ... for comparison.
This unit (the "PRO" experimental model ) uses an analogue signal chain processor so some user skill will probably be required to determine discrim tones ... the "Super Pro" experimental model has
the full ducks guts DSP unit and should ( when I finish it LOL ) provide more indicative discrim. FYI the non ferrous targets sound mellower ... the iron targets have more of a ping.

[turtleman]

A real discriminating PI. Fabtabulous!!! I couldn't see a headphone jack in the picture. Is there one?

Nice work.

[WM6]

Excellent work moodz. Congratulations.

If you haven't place to store this beast, I can send you my address (you can even keep the battery and, of course, you have my word not to forward anything to our friend Woo).

[chudster]

Hmmm nice green grass, it must have been raining in Melbourne. I've heard it is kind of dry in Adelaide lately.

http://www.bom.gov.au/climate/current/month/sa/adelaide.shtml

Chudster