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Search results

  1. C

    F75 Discrimination

    I thought I would post a comment or two on the discrimination capabilities of the F75. I have a quarter planted that is surrounded by the typical trash metals we find in a trashy park which are iron, pulltabs, aluminum, etc. I want to know what a detector will do in these conditions as I like to...
  2. C

    Got the F75 and played with it for a few hours.

    I am as pleased with the F75 as I have been with any detector. I always take some time with a new machine and the users manual to get a good feel for the detector before I try to test it on planted coins. GROUND BALANCE IS IMPORTANT as with most detectors and I could see this more clearly with...
  3. C

    MattR and All

    MattR, sorry to harp on this but we have seen the lines of force traced by iron filings on paper experiment. We have all seen the PR drawing and others of the flux from the coil which looks so nice and uniform. I can see a uniform flux in free air but have often wondered what the pattern looks...
  4. C

    MattR, Capt Kirk, and All

    MattR and Capt Kirk, Assume various soils that contain no refined metal. Some of the soil may be what is often called heavily mineralized some medium, and other very light to neutral. Do you have any idea what the signal emanating from the search head would resemble in the varous soil...
  5. C

    New SE...I like it I really do!

    I got the new SE today and really like what I see. Boy getting the menu more organized really takes care of a personal irritant for me. I hate to see a menu progression that seems poorly organized and no matter how willing I am to adopt to it I have it stuck in my craw. I nothing else this is...
  6. C

    Erik, VCO Pinpointing

    Erik you asked some questions of me down the page and I don
  7. C

    A word for the Sponsors

    I was thinking about the sponsors of the forums and the dilemma of new or updated detectors. Not only do you have money tied up in the
  8. C

    More Finds

    The detectors I use and have used over the years would detect deeper in all metal than in discrimination. There were others that had the all metal sensitivity reduced so it was the same as the discrimination but I think that gave way to better judgment of giving users greater depth in all metal...
  9. C

    Sounds Again

    So, how do we distinguish a high pitch sound that hits "somewhere" in conductive zone 31. One way is with a Ferrous "marker" in which we look at the horizontal axis for an indication of how much ferrous content the target has. Another is to go by the duration of the sound or telling one middle C...
  10. C

    Sounds Illustration

    This illustration may help. When using conductive sounds there is no difference in the pitch of the sound at a reading of 31 no matter where it hits in the red conductive 31 zone. It is does not matter if it is at the far right or far left. Only a movement on the vertical axis produces a...
  11. C

    Vietnam and Metal Detectors

    I appreciate the comments about Vietnam. I agree that this is a forum for another topic and frankly don't recall what I said about those years and my service. It was however in Vietnam that I became interested in metal detectors. When I first got into the hobby there would be one or two guys...
  12. C

    Noise Cancel and Sensitivity

    Noise Cancel and Semi-auto sensitivity are important to understand. If we test our detector in semi-auto close to EMI we see a considerable decrease in sensitivity. As an example in my home I have a shop where I rebuild and repair antique guitars and amplifiers. I have florescent lights which...
  13. C

    Long Technical POST intended for Engineers and Technicians

    I have been doing some research for my own education on metal detector types. You will or have noticed I use patents and frankly it takes a strong background in electronics to wade through the material for the more informative patents as you guys know. The patents are the only information I have...
  14. C

    Moving a Thread

    What I did not realize was participants may not know how to follow a thread that is moved. So, this is how you can do that. At the top of the forum are options, in blue lettering, and one is Search. Go to Search and look up the name of the individual for a post you are interested in and all post...
  15. C

    Super Detector....I doubt it!

    When we talk about how deep are we going to go with hobby detectors there is a basic problem no matter what type we use. These detectors do not transmit a signal such as a Doppler radar so that there is no limit as long as we increase the power in how far the signal extends from the coil. On a...
  16. C

    Noise/Pulse Devil

    I was asked about the Pulse Devil and looked at some comments by Dave Emery that is the design engineer. My post about the different detectors IB, TR, BFO, and VLF was to establish a foundation for my assertion that the Explorer is a PI and use the Pulse Devil as an example. What Bruce Candy did...
  17. C

    Noise Cancel and Ground Balance (LONG)

    The comments about ground balance and noise balance are interesting so I thought I would add some input. Let me provide an illustration so clarify the differences between ground balance and noise cancel that may help. (This is a rough original of some material that will be including in my book...
  18. C

    Technical on Filters

    Capacitors, inductors (coils of wire), and resistors can be combined in combinations to filter or couple signals. There is a relationship between these three components and voltage and current. In a nut shell voltage and current are in phase in a pure resistance. There is no lead or lag of...
  19. 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...
  20. 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...
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