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Re: Velocity of Propagation Yeah, your right, Paul. The 468 that I used was the number normally used for 1/2 wave dipole wire antennas. It assumes a VF of .95 for the average 14 gauge, non-insulated wire. 491.8 is a better number. It is still important to use name brand coax, with...

Let me clarify my statement. I was referring to different velocity factors among similar cable types. Higher velocity factor indicates more efficient dielectric properties, resulting in lower loss. Good catch on the odd multiples. Notice that in my example, I used an even multiple. I failed...

In all truth, the best length to use is enough to get to the antenna. If varying the length of the coax changes your SWR reading, then your antenna is not 50 ohms. That being said, by using electrical 1/2 wave multiples, you can make your finals happy with almost any antenna and all of the...

Might start with this Club: South Arkansas Amateur Radio Club 460 W Oak St El Dorado, AR 71730 (870) 863-4931 Rich

We used to invite the local CBers to our Field Day outings. We always had a great weekend, with a party atmosphere. We let the CBers operate the equipment(under the watchful eye of a control op). You should have seen their smiles. We always got a new Ham or two out of the process. Check...

Name on the sailboat, a Macgregor 26X and the fact that I'm an eXtra class ham. Kind of a play on Ham and Eggs, also. Rich

Your wattage is figured 20 X .25 Watts = 5 Watts continuous. You would need 3 of the 150 ohm resistors in parallel to get 50 ohms. Rich

As I recall, the ten-meter Ringo antenna is a half-wave and as such does not require a ground plane. The ring at the bottom is simply a matching device. Rich

Great article. Rich

I assume that dbm, in this case, refers to "Dirt Bags/Minute" :lol: Rich

Works now, thanks. Rich

I guess that I am doing something wrong, but when I try to login I get this: [20:13] Connecting... [20:13] Unable to connect : java.security.AccessControlException : access denied (java.net.SocketPermission irc.dynastynet.net resolve) ???????????Rich??????????

ELF~Extremely Low Frequency Rich

Here is an excellent article on the subject. Antennas and Feedlines by W6WQC He puts it into much better words than I can. It's rather long, but well worth the read. Rich

I just installed a DB-408 on a commercial, UHF repeater, last weekend, so am familiar with phased arrays. However, my statement still remains true, as I was referring to radiation from a single element. All radiation from each individual element in a phased array, is in phase. It is the out of...

Actually, I would like to show that a 40 meter dipole can be used on 80 and only lose less <5% efficiency. But you are correct, I have wandered off topic and will return this thread to it's regularly scheduled programming. :arrow: Is too in phase, or it won't radiate :wink: Rich

:?: :shock: :?: :shock: :?: Rich

Then explain your statement in a previous post, please. I did explain why it is a non-issue. All power that is radiated, from any radiator, is in phase. Any out of phase power is reflected back to the ATU and re-reflected back to the antenna, where the same percentage of power is radiated in...

You missed my point. Perhaps I should have been more direct. I was asking you where your canceled power went to. My position is: In a properly operating antenna system, with proper feedline (parallel conductor) and a properly designed and tuned transmatch at the transmitter, It matters not...

Power cancelation? Poof, it's gone? Where did this canceled power go? Reflected? SWR? ?? More to come. Where's Kurt, when I need him? Rich