Can this be the next leap in detector technology?

[Anonymous]

Noting that RX sensitivity plays a key role in depth but is limited by EMF interference, is it possible to embed an identifying code in the TX signal so that the RX reject any other RF that comes in which does not contain the ID code?
The idea is to put a very simple ID code into the TX signal (digital) into the TX signal and still be able to read the necessary analogue data (signal decay).
I was looking at my wireless router and am still surprised by its ability to run 3 computers on the same frequency with no cross talk, not even counting the 3 wireless phones in the house which run on the same channel (2.4Ghz).
Just a thought.

 

[Anonymous]

the reflected signal from a target would carry that code. I don't believe it is possible with VLF or PI techonology. Also the ground signal (mineralization) is generally considered the limiting factor in both transmit power and the ability to hear faint target in the "noise" the receive circuits deal with.
Tom

 

[Anonymous]

by the FCC. <img src="/metal/html/shrug.gif" border=0 width=37 height=15 alt=":shrug">

 

[Anonymous]

A simple code might be embedded in the transmit signal to identify the TX signal vs. external noise. I do not actually know if a reflected signal will exhibit the same code in a readable form though. But a code similar to that used in ELF submarine communications could be used. It does not need to contain a complex message but essentially enough info to be distinguished as the TX signal (1-0-1-its me!).
I do not think that ground signal is the limiting factor for a detector like the Explorer. When the ground is balanced properly, I would think that RX sensitity and resistance to inteference would be the limiting factor in attaining more depth. A faster processor also helps in rejecting ground signals. That is ofcourse only my opinion, maybe others can come in a present theirs.

 

[Anonymous]

[No message]

 

[Anonymous]

Mayumi,
As I understand it, detectors are intentionally shielded from the transmitted signal (induction balanced).
Since the Explorer is very broad banded it is going to be prone to RF interference as part of its design. Perhaps they should add a manual tuning knob for fine tuning after noise cancel has been done. They recently added that on their high end gold detector.
Tom

 

[Anonymous]

CDMA (code division multiple access) use spread spectrum process gain to allow receivers to partially discriminate against unwanted signals. Signals with the desired spreading code and timing are received, while signals with different spreading codes (or the same spreading code but a different timing offset) appear as wideband noise reduced by the process gain. Perhaps Minelab can come-out with the 1st Broadband CDMA spread spectrum detector!