Ham Radio - 630-10 meter antenna software modeling results.

Discussion in 'Amateur Radio News' started by KB7TBT, Mar 19, 2020.

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  1. KB7TBT

    KB7TBT Ham Member QRZ Page

    Ham Radio - 630-10 meter antenna software modeling results.

     
  2. KG5CJA

    KG5CJA Ham Member QRZ Page

    How many videos can one YouTuber have on the front page "News" section at one time?
     
  3. W1YW

    W1YW Ham Member QRZ Page

    WHY is this "promising"??
     
    AF4RK likes this.
  4. HB9EPC

    HB9EPC Ham Member QRZ Page

    Malheureusement jl n'y a pas de miracle !
     
  5. WA5MD

    WA5MD XML Subscriber QRZ Page

    At 630 meters it's not about the gain, it's about the efficiency. How much of the applied power is actually radiated ? Can his software calculate that? And also, what is the comparison antenna in terms of what someone would normally build? I'd like to see it compared to a base-loaded monopole of the same height as one of the supporting poles, using a loading coil made of regular THNN 12 gauge wire you'd pick up at Home Depot. Maybe with a simple top-hat of the same radius as the spiral?
    No, I probably wouldn't build a base-loaded vertical for 630m, either. It's the least efficient option, but the most simple mechanically. How about a THNN 12g loading coil (practical dimensions for optimal Q) at the top of the (single) mast of the same height, and a top-loading wire?
    In these terms, with a reasonable ground plane and (relatively) high Q inductive loading due to the large diameter of the spiral, this might be practical on 630m.
    Would it stay up ???
     
    KA0HCP likes this.
  6. W1YW

    W1YW Ham Member QRZ Page

    The 'gain ' calculation shown includes the inefficiency caused by ohmic losses.

    Pleas: let's not get into one of those 'gain' vs 'realized gain' discussions. The value shown incorporates the losses, demonstrating it is highly inefficient.

    If they ran the model with NO LOSSES, then the efficiency can be estimated by comparison, but it will be bogus-- the ground is not modeled accurately and the 'model' uses radials rather than a single ground rod into poor to fair ground.
     
  7. K2WH

    K2WH Premium Subscriber QRZ Page

    From what I can see, its simply a giant air core loading coil without the usual so-called "Stinger".
     
    KQ9J likes this.
  8. NN4RH

    NN4RH Premium Subscriber QRZ Page

    I've seen enough of 'TBT's posts before, to understand that being "accurate" is not one of his priorities ...
     
    AF4RK likes this.
  9. K0MAN

    K0MAN Ham Member QRZ Page

    So much Negativity!! Without experimentation we would have never left the cave!!! Keep on it KB7TBT!!
     
  10. K2WH

    K2WH Premium Subscriber QRZ Page

    While there is negativity and for good reason, there is also reality.
     
    KG5CJA likes this.

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