A
Anonymous
Guest
It has been stated that SD's aren't using a lot of power in the transmit circuitry and that most of the power is being used by the receiver and processing circuits.
It doesn
It doesn
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A
Anonymous
Guest
HI Eric
AS far as I know there is no tone ID on the sd2100. I use a 21 and certainly havent heard anything approaching a discrimination tone. The 2200 has a microprocessor which according to Minelab draws more power from the battery than the 21 and accounts for the higher power requirements for the 2200. The microprocessor is used to drive the discrimination circuits. There is no microprocessor in the 2100. Perhaps you were refering to the 2200 and the GP Extreme?
It will certainly be interesting to see how the new garrett's discrimination works!!!! I am extermely doubtfull if any discrimination circuit is absolutely foolproof. I will still use the visual discrimination method ie dig it up and see what it is.
I agree with your statement that the transmitter should draw most of the power from the circuit.
Cheers
Steve D
AS far as I know there is no tone ID on the sd2100. I use a 21 and certainly havent heard anything approaching a discrimination tone. The 2200 has a microprocessor which according to Minelab draws more power from the battery than the 21 and accounts for the higher power requirements for the 2200. The microprocessor is used to drive the discrimination circuits. There is no microprocessor in the 2100. Perhaps you were refering to the 2200 and the GP Extreme?
It will certainly be interesting to see how the new garrett's discrimination works!!!! I am extermely doubtfull if any discrimination circuit is absolutely foolproof. I will still use the visual discrimination method ie dig it up and see what it is.
I agree with your statement that the transmitter should draw most of the power from the circuit.
Cheers
Steve D
A
Anonymous
Guest
My thoughts are much the same as Eric's, though
the 140ma is a bit high, it probably isn't much
concern as we lug a large battery around and this is basically needed for the tx circuit. Candy
tried to patent a battery saver circuit and whites
had his claim defeated, maybe Garret is using something along these lines? This would need to be bi-polar to be efficient and would maybe need a pack with a higher voltage. The other way to save current would be to lower the pulse rate (resulting in a slower sweep speed) and shorten
the pulses.
It would be great to look at the patent and see
how they are universally cancelling the ferrite, if at all, as this is the most valuable feature of the SD/GP and would be useless without it.
the 140ma is a bit high, it probably isn't much
concern as we lug a large battery around and this is basically needed for the tx circuit. Candy
tried to patent a battery saver circuit and whites
had his claim defeated, maybe Garret is using something along these lines? This would need to be bi-polar to be efficient and would maybe need a pack with a higher voltage. The other way to save current would be to lower the pulse rate (resulting in a slower sweep speed) and shorten
the pulses.
It would be great to look at the patent and see
how they are universally cancelling the ferrite, if at all, as this is the most valuable feature of the SD/GP and would be useless without it.
A
Anonymous
Guest
Hi Steve,
I have an SD2100 here, and I did the tests the same day as I made the post. I also had a SD2200D (now sold) which I did tests on a couple of years ago and the current drain was much about the same.
Eric.
I have an SD2100 here, and I did the tests the same day as I made the post. I also had a SD2200D (now sold) which I did tests on a couple of years ago and the current drain was much about the same.
Eric.
A
Anonymous
Guest
The SD series Detectors produce the same output power from all models at around 640mA (as Eric said) depending on supply voltage.
The supply voltage is proportionate to the output power produced, hence why there is some benefit from the 12 volt/reduced to 7.45V power supply system currently being marketed around the traps for these units.
The 7.45V power supply isn't recommended for the Extreme. (partly due I beleive, to my thinking that the "Dual Voltage" claims of the extreme are perhaps related to a higher internal Power Supply Voltage to the TX and a separate nominal 5V-6V supply to the processing CCTy.)
The increase in available power using 7.45V in the SD series is nominal at around 15% max (measured with a CRO)
Although the actual improvement in detecting targets is not overly increased in practice from what I have tested.
I think you would need a logarythmic increase in power to get a noticable increase in target response for these units.
In my view, the real key to improving SD's is in modyfying the pulse timing and therefore chasing different shaped targets accordingly. <IMG SRC="/forums/images/wink.gif" BORDER=0 ALT="
">
I feel the only real benefit of an increased supply Voltage would be to maintain a consistant supply over the days detecting, because with the standard 6V system, there is a marginal reduction in performance as the battery Volts drop from a fully charged 6.45 down to around 5.98V.
The majority of current for all SD units would appear to be used in the TX/Coil cct, this is clearly evident if anyone has made a practically tuned probe coil for one of these things... the wiring gets quite warm. <IMG SRC="/forums/images/biggrin.gif" BORDER=0 ALT="">
The supply voltage is proportionate to the output power produced, hence why there is some benefit from the 12 volt/reduced to 7.45V power supply system currently being marketed around the traps for these units.
The 7.45V power supply isn't recommended for the Extreme. (partly due I beleive, to my thinking that the "Dual Voltage" claims of the extreme are perhaps related to a higher internal Power Supply Voltage to the TX and a separate nominal 5V-6V supply to the processing CCTy.)
The increase in available power using 7.45V in the SD series is nominal at around 15% max (measured with a CRO)
Although the actual improvement in detecting targets is not overly increased in practice from what I have tested.
I think you would need a logarythmic increase in power to get a noticable increase in target response for these units.
In my view, the real key to improving SD's is in modyfying the pulse timing and therefore chasing different shaped targets accordingly. <IMG SRC="/forums/images/wink.gif" BORDER=0 ALT="
">I feel the only real benefit of an increased supply Voltage would be to maintain a consistant supply over the days detecting, because with the standard 6V system, there is a marginal reduction in performance as the battery Volts drop from a fully charged 6.45 down to around 5.98V.
The majority of current for all SD units would appear to be used in the TX/Coil cct, this is clearly evident if anyone has made a practically tuned probe coil for one of these things... the wiring gets quite warm. <IMG SRC="/forums/images/biggrin.gif" BORDER=0 ALT="
">