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Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

WM6
September 01, 2018 07:32AM
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Quote
jmaryt

,i was always curious about fisher'd stated
"fourier domain analysis"..i believe,but am not sure that this pertains to the 5khz,
and 15 khz frequencies transmitting simultaneously.

j.t.

Transmitting more than one frequency at the same time is technically based on
"Fourier domain analysis" actually. More precise on fact, that some shape of signals
(par example square wave, triangle wave etc.), that are not pure sine wave, are in fact
composited from broad spectrum of sine waves or spectrum of different harmonic
frequencies, that are all sine waves.

So if we need to drive coil with two simultaneously acting sine frequencies (here 5 and 15kHz)
we need to drive coil with 5 kHz square wave frequency that incorporate both 5 and 15 kHz
sine harmonics.

Then we need on RX side two RX channels (for 5 and for 15 kHz), adequate filtering depending
on detector search intention ... etc.

Despite almost equal scheme, CZ 3d detector is not the same as others from Fisher CZ series.

It is different in some filtering stages and dedicated to old ancient coin searching. In conclusion
it is more suitable to old (Roman, medieval etc.) Europe sites, than North America sites, where
mostly new era coins are found. For N. America sites suit better others CZ models, than CZ-3d.

More clarification on how to "frequencies transmitting simultaneously" in drawings below:



Subject Author Views Posted

cz 3d

jmaryt 162 August 30, 2018 09:04PM

The CZ-3D series detectors.

Rich (Utah) 91 August 31, 2018 06:48PM

Re: The CZ-3D series detectors.

jmaryt 99 August 31, 2018 08:21PM

A little CZ follow up.

Rich (Utah) 91 August 31, 2018 09:13PM

Audio and Zero and Me.

Monte 128 September 01, 2018 07:45AM

Re: A little CZ follow up.

jmaryt 112 September 01, 2018 01:29AM

Just to clarify.

Rich (Utah) 100 September 01, 2018 10:03PM

Yep, I agree: .. "The 0 discrimination setting made little difference." N/T

Monte 96 September 01, 2018 11:26PM

Re: cz 3d

WM6 111 August 31, 2018 09:32AM

Good report from someone who is in the "I like it." category.

Monte 97 August 31, 2018 04:38PM

The Fisher CZ-3D? You asked, but you might not like my biased reply.

Monte 131 August 31, 2018 08:36AM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

jmaryt 121 August 31, 2018 01:55PM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

WM6 82 September 01, 2018 07:32AM

Development of The Fisher CZ-3D

Rich (Utah) 89 September 01, 2018 11:22PM

Re: Development of The Fisher CZ-3D

WM6 69 September 02, 2018 02:52AM

2:34 AM .. Just finished re-reading that 6 page report.

Monte 76 September 02, 2018 02:43AM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

jmaryt 78 September 01, 2018 12:46PM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

WM6 73 September 01, 2018 01:32PM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

jmaryt 83 September 01, 2018 07:26PM

Re: The Fisher CZ-3D? You asked, but you might not like my biased reply.

Druid 15 December 16, 2018 05:16PM

Yep, best of the CZ bunch was the CZ-5.

Monte 13 December 16, 2018 05:46PM

Of all the Fishers (CZ5,1236X2, 1266) that I have owned, I liked the 1266 the bestthumbs up

Hombre 20 December 17, 2018 12:33PM



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