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  1. cavitate

    Torque wrench capacity extensions

    I have 250ft/lbs adjustable torque wrench. I need to torque a device to 450ft/lbs. I can buy a torque adapter extension. I have no problem with the math to compute the torque, what I don't see is how do I get the length of the of the torque wrench? I know from the center of the socket, but I...
  2. cavitate

    Inductance of ferrite core inductor at low B field

    I found a page about, "The “Four Times the Impedance” Rule for Broadband RF Transformer Windings: Where Does it Originate? Way too much math for me, but the last two pages explain why 4 times...
  3. cavitate

    Inductance of ferrite core inductor at low B field

    >Glad to have helped you clarify your problem, as your post was quite ambiguous. LOL, my explaining to you about the use of AsubL in transformer calculations did nothing clarify anything in my original post. I'm sorry, you didn't understand, but, rather than my question being ambiguous, it...
  4. cavitate

    Inductance of ferrite core inductor at low B field

    >You have to explain your term AsubL I will, but why are you telling me how to wind a transformer when you don't know what AsubL is? AsubL is a characteristic term of magnetic cores, It is a combination of physical size and the permeability of the magnetic material. It is used in the...
  5. cavitate

    Inductance of ferrite core inductor at low B field

    I thought of another way to phrase my question. At what signal level is AsubL measured? Does AsubL decrease at very low signal levels? Thanks, Mikek
  6. cavitate

    Inductance of ferrite core inductor at low B field

    Also, rereading, I see you wrote, >So try 36 primary to 4 secondary turns A 9:1 impedance ratio transformation, requires a 3:1 turns ratio. So far I have wound a 5 to 15 turn transformer, the primary inductance is about 20% high. I will try a 4 to 12 turn ratio today, I suspect I will have...
  7. cavitate

    Inductance of ferrite core inductor at low B field

    > Remember, now you have the opportunity to learn more! LOL, I'm plenty aware of single turn untuned loops, multiturn Tuned loops, BOG antennas, Yagi's, Phased antennas, etc. But sure, I'm always learning new things. >You're planning a FET preamp, why not just a 1:1 transformer for isolation...
  8. cavitate

    Inductance of ferrite core inductor at low B field

    I'm setup with two fiberglass poles 70ft apart, the original plan was for a DKAZ antenna, but heard it had low output on LW signals so decided to start with a Superloop antenna with a variable termination, and then later switch it over to a DKAZ. I later got info that the DKAZ is OK on LW, but...
  9. cavitate

    Inductance of ferrite core inductor at low B field

    I have wound 100s of transformers, they all work, but as they say fray the end of a coax and you will receive may signals, But does that make it a good antenna? Mikek
  10. cavitate

    Inductance of ferrite core inductor at low B field

    A bit of back story for context. 45 years ago in an electronics class, the instructor passed out heavy duty, 5 Henry audio Chokes to the class members, We were all told to find the inductance. We did, and the general consensus was answer was it was a few milliHenries. And we were on to the next...
  11. cavitate

    Need method to open/close a 4" vertical tube to adjust spillover level

    I have added one idea to the right side of the original drawing. A sliding sleeve. Thanks for your input, Mikek
  12. cavitate

    Need method to open/close a 4" vertical tube to adjust spillover level

    I have a 4" vertical thin wall aluminum spillover tube, I want the spill over tube to have two adjustments besides the full height. There is not a lot of room to make these adjustments, but probably just enough depending on solution. I have include some relevant info in the drawing. My first...
  13. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    Acetone, Hexane, bits made from plumbing parts, 90C operation, 10kV electricity.... Hope you have A) Life insurance B) Your garage is a long way from your house C) A video recorder running so that investigators can see what the big bang was... The hexane is only for cleaning between runs of...
  14. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    Is it solid or flexible? Yes, it is flexible, I would have called it rubber until I researched and found it is an Elastomeric Polyvinyl Chloride. Looks to me a bit like a domestic plumbing adapter so could easily get VERY flexible at 90C Even more flexible at 90*C, than room temp, to the...
  15. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    The rubber boot I was so happy to find may not be the right material. I find it is called Elastomeric Polyvinyl Chloride. I can't find and specifications for Elastomeric Polyvinyl Chloride, all I get are hits for PVC. Would there be any difference in max temp before deforming between...
  16. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    There is a big difference in CTE between steel and plastic. There are rubber sleeves that can adapt the pipes together. The joint needs to be flexible. After finding the price of Stainless steel pipe, I already bit the bullet on 30" piece of 4.5" stainless pipe at $60, from the scrapyard. I...
  17. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    Good for 10kV? I expect so, but will have to spend the $24 to get one and test. The flat bottom is a good design for us, it will be easier to drain. I think I can put a drain on the flat part. The previous test vessel we built had a resistance over 200MΩ,with emulsion in vessel, the limit of...
  18. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    I think I found an easy solution. Just need to find what the material is, and pipe that is 4.5" and 8.5" O.D. Mikek
  19. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    The outer tube and plug will slide down when the weight of the fluid is added. Your welded ring looks to be in the wrong place. Probably should add more info. I expect a tripod will be welded to the outside of 8" pipe support it standing upright. Then the 4" pipe could slid down, thus the...
  20. cavitate

    Need to seal steel pipe with PVC pipe inside, How?

    I have made another drawing with an Oring seal. Sorry for my drawing skills, I hope it gets the point across. I would not be able to engineer a proper Oring seal, so that would need to be farmed out. But, I want to get a concept that would do the job. This is ignoring how The 4" pipe will be...

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