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Thread: reproduce B&W AP-10/B antenna coi (or not?)l

  1. #1

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    Default reproduce B&W AP-10/B antenna coil (or not?)

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    Last edited by n4trc; Yesterday at 02:57.

  2. #2

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    Er, that's good, I think. What are you hoping for/concerned about? It's not quite clear in my head what the post asks/wants/is for? probably me.

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    the math will answer what is typical...so that you can do yourself...
    the rest of what your getting at is a bit more complicated...
    how much effort to get what amount of gain is a matter of choice... will you really see enough improvement in performance to be worth what it will take to make the homebrew coil fit, is something only you can decide...you might see a bit of bandwidth gain...is that actually going to make your reception better, help you hear weaker signals... help the folks on the other end hear you...for me, the effort would not be worth what I believe I might actually gain...I figure the most gain will be on paper or seen on a scope, but not realized in your day to day operating....but that is just me, the perfectionists out there will disagree with me...

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    Quote Originally Posted by n4trc View Post
    If I knew for sure that rf feedback/hot spots wouldn’t be at issue. ...
    The only way to know that for sure is DO it and see. There are too many variables to even make a guess. Same for the coil. If you don't have a means of measuring inductance, get as close as you can and see what results you have. If it's a tuned circuit, try making it a little bit longer and trimming it like fine tuning an antenna.
    73
    Pat K7KBN
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  7. #7

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    Here's a way to compare coils to answer the questions:

    http://hamwaves.com/antennas/inductance.html

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    Have you ever tried soldering to aluminum? If you have to solder the coil in place, I'd VERY strongly recommend copper.
    73
    Pat K7KBN
    Semper ubi sub ubi.

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    I'd guess the original B&W coil was silver-plated copper.
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    Pat K7KBN
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    18 gauge [sic] wire is 18 gauge wire if it's made for the electrical trade. "Jewelry" or "hobby" wire may have their own standards and may not be a precise fit.

    I'd go with the solid copper or silver-plated copper - and don't let them tell you that nickel plating is better. Nickel won't solder much better than aluminum.
    73
    Pat K7KBN
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    I almost forgot something about that "silver" wire. It's possible that it's solid copper wire that's been tinned (coated with solder).
    Just a thought...
    73
    Pat K7KBN
    Semper ubi sub ubi.

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