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All CZ's have an audio limiter built in. I believe after "5" on an analog CZ, the limiting circuit effects begin to become apparent. discriminating out the loud targets and only hearing the quiet ones would require circuitry beyond the limiter. A silencing circuit that would operate in reverse mode - turning off the audio once a certain high threshold were met.
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Was going through an old local history book and came across a couple more. Not sure if all abbreviations are standard. In a local 1800's atlas, they abbreviate school house two different ways and also spell it out.
C.B. = Carriage Builder
W.M.= Wagon Maker
Oddly, they made wagons but built carriages.
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
G. M. - Grist Mill
G & S M - Grist and Saw Mill
S. M. - Saw Mill
W. S. - Wheelwright Shop
C. M. - Cabinet Maker?
H. K. - Hotel Keeper?
C. B. - ?
T. S. - ?
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Perhaps the firmware is flashed onto a eprom that is socketed(or just soldered) and not directly upgradeable aside from removing the firmware chip and replacing it with a different one.
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
I have seen many quote that the maximum TX output power allowed in a detector, due to Part 15 FCC compliance, is 100 mW. The reason I ask is because if indeed detectors are included in FCC's definition of a Part 15 compliant intentional radiator, the detectors would require an FCC compliance label. I've never seen this on any detector. Also, the other thing that has me wondering is the
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Speaker/headphone impedance is a nominal value. The actual impedance varies widely over the audio frequency range. The Deus Backphones probably have a little more going on, electronically, in the audio-processing department.
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
For what it's worth, the CZ transmits a single 5 KHz square wave(divided down from an internal 60.100 KHz clock). The RX or receive portion of the CZ circuit must receive this 5KHz square wave in order to filter it into its fundamental (5Khz) and 3rd harmonic(15Khz) components. These seperate signals are then mathematically manipulated(electronically) to attain ground mineral cancellation, a
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
The higher mAh, the longer the battery life. Typically, the current drain during search is around 30 mA(milliamps). Once a signal is received, the audio circuitry draws much more additional current.
Typical 9 volt alkaline batteries are around 500 mAh. And if your nimh batteries are rated at 175 mAh, You will get only .35 (from dividing 175/500) the rated alkaline battery life which is listed
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Tom, I can get it to high tone in air. It almost seems as though it's transmit power is too low. I am going to clean out a spot and bury dimes at specific depth increments and compare the results between my CZ6 and CZ70.
Unfortunately, the detector club that I know of only has one member with a fisher CZ6a, not the CZ6. I am going to convert the jacks and plugs on the CZ6. I've been
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Tom, turns out one of the batteries was quirky. I charged them and measured their voltages and one was only showing 7.5 volts. I bought another pair and the battery issue seems to be resolved. The defective battery did not bother my CZ70 or Coinstrike for whatever reason.
The ID is still weird. I have been using the CZ6 in ID mode, rejecting nothing, to listen to the tones. The dime still mid
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
I have an older CZ-6. I haven't used it for a few years. Yesterday, I took it out. Loaded it with two NiMH 9v batteries and after 30 minutes, the batteries were too weak to work in the detector. I recharged them and tonight they lasted only 1 hour. The detector seems to be not ID'ing as well as my CZ70 and the depth seems a bit low. For instance, I have a dime burried at 5 inches. The C
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum
Lawrenzo Wrote:
-------------------------------------------------------
> It may be your soil is perfect for the V3 and
> others are just doing OK in their soil or you have
> the V3 dialed in and others are still kicking the
> tires.
Or maybe he's a faster digger...
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Ed-CZ
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Thomas Dankowski Metal Detecting Forum