Latest Minelab Patent - 11th Feb 2016

[Davor]

... whereas Dave J's device must filter the RX to admit only selected signals...

... or not. When you consider QSD as an N-path filter, CZ could do just as well without extensive front-end filtering. What those filters do is GB each of the signal paths against the respective QSD phase, and reverse phase/balance the level of the high frequency path. The advantage of filtering is having two pristine pairs of pure R and X quadrature components, but I still vote for a simpler approach.
If there were no front-end filters, you'd have a small portion of a higher frequency X and R included in lower frequency QSD products, but you eliminate those by balancing the higher frequency path.
In effect with BBS signal you can have the exact thing, except frequency paths are processed sequentially. When you have a luxury of GB-ing the quadrature components in a micro, your complete BBS front end becomes a single Tx bridge, a single Rx preamp, and a single QSD. And a micro that does everything else. That's about it.

[Dave J.]

Davor is basically correct.

There is a continuum between CZ and BBS. There is not a continuum between BBS and PI, there is an absolutely fundamental difference between those two things which I've explained several times already in this thread.

[Dave J.]

Davor is basically correct.

There is a continuum between CZ and BBS. There is not a continuum between BBS and PI, there is an absolutely fundamental difference between those two things which I've explained several times already in this thread.

It is possible to demodulate a PI signal in the frequency domain. That doesn't make it almost a VLF. The fundamental difference between "VLF" and PI, is that in PI metal target signals are received and detected during intervals where the transmit current is not changing. That's what PI is, and what "VLF" (as the term is used in the metal detector industry) isn't-- even in a platform where the machine does both PI and VLF.

[kt315]

Well, this thread has already been clogged with off-topic stuff, I don't suppose a post on the CZ5 would do any additional harm. What was it you wanted to know?

Dave, people is waiting from you (YOU) the help. schematics and methodics. why (WHY!) you do not want to help?
i ask YOU because you are IN THIS FORUM.
this thread and be not so silent now - YOU HAVE, while i am only simple 315.
http://www.geotech1.com/forums/showt...888#post215888

[Dave J.]

Dave, people is waiting from you (YOU) the help. schematics and methodics. why (WHY!) you do not want to help?
i ask YOU because you are IN THIS FORUM.
this thread and be not so silent now - YOU HAVE, while i am only simple 315.
http://www.geotech1.com/forums/showt...888#post215888

If you want to build a CZ-5, go ahead and do it. If it's beyond your capability, build something simpler or stick with trying to make an incandescent bulb flashlight work. If you want to know whether or not it's really a PI, there's a guy who posts under the name "metalpopper" on the Findmall technology forum who will probably be happy to help you out on that.

[kt315]

If you want to build a CZ-5, go ahead and do it. If it's beyond your capability, build something simpler or stick with trying to make an incandescent bulb flashlight work. If you want to know whether or not it's really a PI, there's a guy who posts under the name "metalpopper" on the Findmall technology forum who will probably be happy to help you out on that.

good direction to another american guy. that i do not know. Dave J. i ask from you this schematic
because you are Dave J. - national american hero. the Superman.



in real Dave i do not need in those blank bare texts that you write here. real. my language is the
language of schemotechnics. no another reason i am here.
guys asks me to send DVD-ROM with archive, so do something for the people usefull.
not the sht those american patents you are linking just cause i am not patented minelab troll.
only real schematic gives the real presentation. you know this fact but cover that up.

mersi from beaches of Baltic Sea

[Dave J.]

As you have already explained, the schematic to a CZ would be useless to you.

[kt315]

Dave Johnson, i wait a progressive rock from you, not Mozart classic music i am not in. WHERE IS THE CIRCUIT?

[Dave J.]

Check with metalpopper over on Findmall, maybe he's got it.

[kt315]

Check with metalpopper over on Findmall, maybe he's got it.

What have I become
My sweetest friend
Everyone I know goes away
In the end
And you could have it all
My empire of dirt
I will let you down
I will make you hurt