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Search results

  1. C

    Coils

    If we take a look at the illustration that Bill posted below we see a detector that is multiple frequency. The RX coil is square wave driven and we see a fundamental frequency at 5khz and third harmonic at 15khz. The third harmonic has 1/3 less amplitude than the fundamental in the illustration...
  2. C

    Hard Times

    I went forum hopping the other day to see what was being said about the new models. I normally only stick to the forums for a detector I use but was curious what was being posted about the new models. I found more than I expected in that I read all these glowing posts about this or that new...
  3. C

    Changing Q and Impedance

    I will do one more of this type because I believe it is important to see the implications of a smart coil. If a coil is matched to the transmitter, the idea of impedance match is for maximum transfer of power from circuits X to Y as you know, we have what we want. The Q of the coil is of...
  4. C

    Technical advantages of X-terras

    While we are chunking rocks at the moon I thought I would toss a few more. Each year we see the new crop of detectors and if you are like I have been for the last 46 years it is like the new Sears catalog of years ago. I go to each new offering and look to see if the newest and greatest has...
  5. C

    Explorer and X-terras

    I am getting very interested in the new X-terras. I realize that about Christmas and in the Spring we are going to see new machines offered. I take a look at the specifications, the Owners Manuals, and go from there. In the years I have been using detectors the technology has a few major...
  6. C

    Giving all a chance to post.

    I have laid back and enjoyed all the good posts. I felt I was taking up more time than I should with a lot of technical posts. There are always things that of interest I see on other forums but are more technical and I felt it was a good idea to not do so much of that posting by myself.
  7. C

    Deleted by Cody

    n/t
  8. C

    Null Discrimination/All Metal and Depth

    I posted this on the other forum under "Sum of Null Discriminatiion" so you know and don't bother with both long draw out explanations. When I talk about capacitor on the input to the receiver I am not talking about blocking DC but a low or high pass filter. Most detectors have filters for this...
  9. C

    Sum of Null Discrimination (Long and dull)

    I have lost my place in all this so started another post instead of replying to a one in specific. Let me define a couple of statements I made and then explain them a little. When I talk about capacitor on the input to the receiver I am not talking about blocking DC but a low or high pass...
  10. C

    Detecting a Target While in Null

    If you have followed any of the discussions on the other forum on this topic I think there is a way to still detect targets while in null. If the null does not drive the threshold any more than say a click below our threshold then we would still be able to detect while in threshold null. So far...
  11. C

    Ramblings

    I did not mean to get anything started with my questions or do I question anyone's knowledge or skills. I shall fade away to the other forum and do appreciate the responses. Have a great remaining Thanksgiving weekend.
  12. C

    MattR

    You are an electronic engineer with a wealth of experience using metal detectors. What is your opinion about being able to detect a target while the threshold is in null. You have written and excellent book on metal detectors and use both the DFX and Explorer. I see the value in a faster...
  13. C

    Have a great Thanksgiving

    n/t
  14. C

    Pros and Cons of SF and MF Detectors

    There are a number of advantages and drawbacks to both single frequency detectors compared to multiple frequency machines. Let me give a little background on single frequency and explain how we ended up with VLF and multiple frequency. The first ones to be patented was single frequency (SF) and...
  15. C

    Threshold Adjustment

    If I adjust the threshold to the point where the threshold just cannot be heard when using my stock headphone then switch to my other headphones I can then hear the threshold. This is one idea of the threshold and is not referenced to adjusting to a point such as 0, 1, 2, 3 as indicated by the...
  16. C

    Quarter Program

    This is dime and quarter program I use at times when there is a lot of trash. I nailed about 20 or so quarters in a pretty shot time at an old fair grounds. Open or close the clear area in the illustration to eliminate copper or include other targets.
  17. C

    Sweep Speed and Length of Sweep

    I often read a post about sweep speed and have done some testing to see how much difference it makes how fast we sweep the coil. These tests were done with a couple of things in mind. The lowest frequency of operation is about 3.5khz, I say about as engineers round these figures off, and the...
  18. C

    Explorer PI OR?

    Please forgive my editing as it is an old habit from my days at the university when I had someone to do that for me and now have to do it myself. Why do we see the mistakes once it is posted? Well we kicked it around as to what kind of detector we all love so much. We posted that we would get...
  19. C

    What to Call This?

    Back in the late sixties and early seventies we had some very good debates over TR and IB detectors. Those discussions and debates are always part of the transition and learning process as technologies advance. They are good and constructive! Anyhow a purist would argue that a TR was a two box...
  20. C

    A little more on Pulse Induction and the Explorer

    A conventional Pulse Induction metal detector is based on the idea of pulsing the coil with a high voltage, a powerful electromagnetic field is burst into the soil, a target is excited and eddy current flow due to self inductance generate an electromagnetic field. The transmitter is turned off...
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