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  1. T

    The EF vs dipole Full Wave pattern anomoly

    I'm not sure if mmana-gal can show the combined current and phase data. If it can that will give a visual on what I am talking about below. If it can't, let me know, I will make some models in 4nec2 where I can add the phase and current data together and post them for you. EDIT:Actually, I...
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    radiation patterns of different types of antennas

    A 12 year old thread resurrected so someone could use a linked document and quoted text, both of which are being used out of context, to try and say "see I was right"? Suggestion, read your own information again, and while your at it, try putting it it in the context intended by the authors...
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    Is resonance really where you get best antenna performance?

    To answer the first question, it depends on your point of view. I have seen both methods used by hobbyists. For example, shortened mobile antennas that are 5 foot long are often referred to as shortened 1/4 wavelength antennas, and some people don't bother to put the shortened. The Imax 2000...
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    Is resonance really where you get best antenna performance?

    Yes, I meant anechoic chamber. It was after a long day of overtime and I was tired. I am doing the same thing again so if I make such a mistake again I will correct it when I am more awake. Yes, that is how they are designed. Never said it did, nor does it need to. You seem to think that...
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    Is resonance really where you get best antenna performance?

    Actually, I think you did bring up something that I should have covered better in my first post... While I use field strength when tuning antennas, in this case I used an antenna model to get a gain in dBi as my starting point. I thought I mentioned this but as I go back and reread what I...
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    Is resonance really where you get best antenna performance?

    I know, there are a lot of people that will quickly say yes and move on. I was once one of them. I note that it is interesting that no one that said tuning for "resonance" is always the best has been able to actually show this. They believe it to the core and can often give hypothetical...
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    NEWB question,, or just chattin

    Technically true, but this assumes that the s-meters on radios are in any way accurate. Apparently you haven't noticed, but on almost every radio out there, the s-meter reading is way off from what the actual measurement should be. If you judge by the meters on most radios, especially on the...
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    7' Skipshooter (Pictures and measurements)

    Marconi read those numbers from a modeling program, and the program is, in fact, accurate. You made the mistake by dividing the absolute load impedance (or Z) from 50 ohms. This is not the correct next step. Below is a link to a web site that both has a calculator, and shows the actual math...
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    Adjustments for resonance

    Glad I can help. I have noticed this as well, and agree with the older and wiser preacher here, at least mostly. That being said, I tend to scale my responses to the level of the person asking, not the lowest level that will ever read them. Sometimes, I'll put the answer right above where...
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    Adjustments for resonance

    Yes, if they see themselves at the level of a technician, yes they should. Sadly most don't, and we get many CB Myths that have even filtered into the ham radio side because of it. The whole "does an antenna tuner actually tune an antenna" debate is a prime example of this. Anyone who...
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    Top loaded whip vs. base loaded antenna

    A 5 foot base loaded antenna will outperform a 3 foot top loaded antenna. In this case, the longer length will outstrip the benefits of having a top load. Beware the words "more efficient". In this hobby those words seem to mean 'more efficient but not so much that you will ever notice the...
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    Building a cubex quad

    This statement is objectively true. Your not even considering the materials the different antennas are made out of and what they can and cannot handle. As I said above, if the two antenna designs were made out of the same materials this would be true, but they are not. If you don't take...
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    Building a cubex quad

    I guess you somehow think that I don't already know this... Or is it that you want to distract from the truth of the matter again? I would look at it differently, but it doesn't matter. Even with your interpretation, my statement above still stands. You are leaving certain very important...
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    Building a cubex quad

    @freecell your argument here is moot. Less wind loading does not imply more durability. They are talking about durability problems, not wind loading problems. With what they have to make quads from, namely not conductive components for the support arms, they tend to be weaker. This means...
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    what is your vswr at the antenna?

    The first question is, what version RigExpert do you have. The AA-55 Zoom and up you don't need to worry about coax length as it is possible to calibrate out the effects of the coax, there are instructions for this in the manual, look in the table of contents for the word "Calibration". If...
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    Great video on how waves and antennas work

    In the stickies above the general thread, there is a thread called "Antenna Theory". I suggest posting this in there. The DB
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    Base Sirio 2008 vs 2016

    In my browser the link is only "http://www.w3pga.org/Antenna" not the full intended link. Opening it in a new tab doesn't change this. Yea, you actually have to use scissors and glue... The DB
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    Base Sirio 2008 vs 2016

    I think it is a stretch to call it "non-technical", given the very low bar that some people consider what is and isn't "technical", and I think this is a tough concept for many to wrap their heads around, but it is correct. I would also direct you to chapter 5 of the freely available "Another...
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    Avanti Sigma4: An alternative view point

    Wow, another distraction... Do you really think someone like me would make the mistake of putting said radials below this point? Actually, I put them slightly higher than this point as a buffer, and to account for things like radial diameter. Yet still, according to every resource, including...
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    Avanti Sigma4: An alternative view point

    Perhaps I should come at this a different way... A note, S-N ground, or Sommerfeld-Norton ground is what nec2 calls "Real Ground". It is by far the newest and most accurate ground system out there by any measure and standard, and this has been confirmed in real world tests. Long story...