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I learned a lot. As a new tech, I'm building a 10M double bazooka. Inv. V RG8X 1/4s, RG213, 50ft. To radio. Is there any value to a choke, since theoretically, it will be balanced, thus no CMC? Thank you!

DO not agree. W4GSM

would really appreciate some additional eidting and notes for newbies. goo dmaterial, but get lost in some places.

electric magnetic field provides electron flow before the actual voltage arrives , straps is good to lower inductance good for the rise of voltage/current that acts as ac as the flow arrives in dc , dividing paths in parallel circuits where one path doesn't have take the blunt of the current , some huge cables can just become molten metal when it takes the blunt of the current , multiple ground locations can or may allow better conductivity bonded all together , antenna mast, towers should have multiple grounds and should be bonded to , parallel also lowers resistance /impedance , bending the coax in a circle encourages lightning to jump out of the coax , using metal bristles on top of the tower dissipates static build up on a tower , doping ground rods with salt can help conductivity but with increasing corrosion on certain metals , small metal filings could help

Thank you.

It all boils down to matching the output impedance of the coax to the INPUT impedence of the antenna FEED POINT, matching Or transforming the I/O impedances of the Ant feed point & the Coax's output end characterestic impedance for Optimum Power transfer with minumum Loss as MUCH as possible.

How daft are these HOA's. Antenna's are forbidden, but satellite dishes (also an antenna!) are allowed. Where is the logic in that?

I watched your video twice in the last two days. The more I think about it, the more I agree with it.

Few people except hams want antennas to cover a wide range of frequencies. The military loves to match antennas that give them specific radiation patterns. The military wants their signal to go where they want them to go.

Um, an OCF antenna is a resonant antenna. I don't think you know what "resonate" means.

_Murphy_ and _Ohm_ had an agreement that *BOTH* sets of their laws would be *STRICTLY ENFORCED!* 😀 *73 de AF6AS*

Very good video, as a newbie the information was clear. I am in an HOA and my antenna will need to be hidden or at least disguised. So non resonant antenna will most likely be my antenna.

Hi. Great antenna. Do you have a formula to calculate the copper tape length for other bands please. Looking to build one for 4M (70mhz) 73 Steve M0UEH

One very interesting thing about using foil tape is that it has a much lower inductance per unit length than a round narrower wire. The wider the tape the lower the indictance per unit length. This can also be very useful depending on your antenna design. You can also use foil tape with a foam double sided tape as the dielectric (in between) as a balanced feeder with a low Charecteristic Impedence. This Paralel line has increased capacitiance and decreased inductance. I have created 50 OHm balanced feedlines with this concept. Great Video Mate & 73 from DownUnder 🇦🇺

Really enjoyed your discussion on Non-Resonant Antennas and the use of Antenna Tuners (Couplers) at the Antenna. We employ this at home and on Field Days very effectively. Makes the best use of power and available antennas for field use. As a matter of Fact in my time as a Transmitter Engineer with CBC all our AM, LW, SW antennas were tuned (Coupled) at the antenna. By the Way so are all the VOA transmitters. Only way to ensure maximum power at the antenna. Note Al new Cellular antennas at least on the Telus and Bell networks the Transmitter fed by Fibre is sitting at the base of the antenna and the coupling again is at the antenna. The loses are as you know both on Receive and Transmit. Even on the old Sherman Tanks the coupler was essentially at the base of the Antenna (All be it on the inside of the steel hull.

I learned alot thanks!

The PLDO component and its usage with an isolated/protected PDU in the shack was a component that I hadn't known about. I knew there was an issue there, and I'd even seen some descriptions of AC to DC power supplies that isolated, to an extent, the AC-side and chassis-ground separately from the DC-out to the radio, but this PLDO component was the missing link in how to make this work. Now the fun part comes in trying to figure out how to make all this apply to my house, including choice of desk location within the house relative to where I want to place the antenna and the SPGP, with relation to the electrical service ground.

Amazing presentation. On the note of not using a tuner at the rig with coax feeder, what about a tuner at the rig with parallel feeder?

I come to ham radio from a broadcast background, I was a broadcast engineer long before I was a ham. At almost every AM station I've worked for or visited, there is a matching network at the tower base, often a PI network with parallel capacitors and a series inductor, even if the tower happens to be a quarter wave length naturally resonant antenna. OTOH, if the tower is not the correct height to be naturally resonant, the matching network cancels out the reactance to make the tower electrically resonant, so that the antenna current will oscillate at the carrier frequency. But the second function which the matching network performs is to convert the 50 ohm transmission line to the resistance of the antenna. At one station the antenna was inductive with a radiation resistance of 24 ohms. So, the network also converted from the 50 ohm transmission line to 24 ohms.

damn and i was just getting into this and now a feed issue or presenter issue, crap!!

Good to hear the correct information, Technically tuners that are placed at the feed point (out at the antenna) are couplers. Very efficient and does not waist RF energy "heating" the coax or feedline. TNX John.

Thank you for this video.

I've heard W6NBC reject the idea of a flat conductor magnetic loop due to skin effect on the edges of the conductor, but here, he is promoting a fist conductor on the same bands for vertical dipoles. What am I missing?

Excellent presentation. The only toes you may be stepping on ar those that THINK they know antennas and tuners and can't understand why their perfomance goes down the drain.

Audio drops at 1 hour into the presentation. Can it be fixed?

Wow! Looking through the questions leads me to think people either never actually watched this or never took in what was being said. It's very informative for the newbie.

At 28:00 the ATU circuit diagram looks like the inductors are always in series and the capacitors are always in shunt but can be switched to toggle which is the first element. Meaning the ATU can only ever be in the first and third quadrant of the smith chart at 27:00. Maybe that is why ATUs can not match all loads?

There’s some useful information here. Hard to believe no one told that second guy to fix his audio.

I have my 3 antennas connected to a 2 position MFJ switch, one position connects to the radio and the other directly to ground with 12ga copper wire. All antennas and equipment are connected to the same buss bar with that connected to a 12 cu ft galvanized window well and bonded to the house ground. Do you see a lightning problem with this setup when all switches are set to ground?

Hello Ward. I have a Grounding question. I have a copper pipe for grounding all my radios inside my Shack & all other Ham equipment. Then connecting it to my outside utility box to my copper bar where all my lightning arrestors are. From the Copper Bar inside the Utility Box connecting to my Ground Rod buried 9' on the ground. Is it safe to connect all my radios & equipment w/ the lightning arrestors? Some said it's wrong to put them all together. Was wondering about your opinion about this? Someone suggested that I need a separate Ground Rod for the Radios & Equipment. That it does not make any sense connecting the Radios & Equipment w/ the Lightning Arrestors for the Antennas? It is very expensive to put another Ground Rod because my Ground in the Property is Granite. I had to hire 3x Laborers to Sledgehammer the ground rod for 4 hours. Costing me around $400.00 in Labor per hour. Stay Safe. 73 Ruben Tiosejo KD6CWI

That's a big attic. 5 dipoles, 20m to 10m bent into my attic. 20m and 17m coiled at the ends round the roof beams to form large coils. I used a mag. loop in the bedroom shack to null out noise on receive from one direction. They work well considering their small size. For other h.f. bands I made a copy of a Joystick, if anybody remembers them, in the front bedroom. I have 26' of wire to it and an MFJ16010 tuner which I was given as not working, the system tunes 160m to 10m. The tuner had an intermittent fault easily solved by re-soldering a wire inside. For 2m I have a 2 element collinear in the shack. All aerials h/b. Many years ago I put a pallet wood walkway below the roof apex so I could walk around safely. G4GHB.

What if your non-resonant antenna has a 9:1 UNUN?

Great explanation. Could easily be cut to 20 minutes or less. Skip the first half hour. From about 30:00 to about 45:00 he actually explains things. The last 15-20 minutes are 80% old men trying to figure out how to un mute their microphones and 20% useful questions and answers.

Thanks for the video!

Thanks John, very informative article. 73 Tarek SU1TA

Great video for helping me understand. I'm looking at a flagpole antenna from zerofive antennas. The owner says to run a tunner in the shack with 100fy of coax between tuner and antenna. I figured remote at the antenna with minimal coax would be best

@W1AL Some great info in this video. Unfortunately it is a myth to think that connecting a station ground to a ground rod outside the shack is a good idea. If lightning didn't exist, MAYBE. But lightning does exist. And if a strike is close enough, the voltage from the strike travels into the ground up the ground rod and its attached wire, and into your shack, likely frying everything connected to it. Ground is not equivalent to as place where lightning goes to die. The ground can and does get charged when struck by lightning, and connecting your radio and ham gear to it increases the danger dramatically. Lesson? Disconnect any buss bars that may be connected together inside the shack from the exterior "ground rod." Think of it this way: certain appliances come with a third wire (the green, for ground) so that it is properly grounded. In the olden days of ham radio, they weren't. What may have been necessary then (to eliminate charging the chassis of that old radio) is unnecessary today. Your ham rig IS grounded if it has a 3-prong plug. What is true for the garden variety appliance is equally true for the rig. Unless you know of an appliance that requires a ground rod being banged into the ground out the nearest window. I sure don't. If one thinks of the logic and physics of it, it really is simple. Now...RF grounding is another myth. BUT, none of these problems were ever solved (or could be) by running a ground wire from anything to an outside ground rod. First of, running a wire creates an antenna, therefore making any problem worse. Far better to put one's energy into ferrite chokes to resolve RFI than messing with "grounding." This old wive's tale needs to be put to bed. The mixup lies in the wording in the NEC code (that "equipment" must be grounded). That doesn't translate into running ground rods to everything that one plugs into an outlet. Why do ham rigs have a "grounding" post? It is for BONDING as you wisely point out. By the way......I live in FL. Lightning is not DIRECTABLE or CONTROLLABLE. Thanks again for your wisdom on this topic. 73 de Scott, W1AL

Awesome discussion. My brain is energized.

Great explanation on tuners, most enjoyable

Excellent video. I use the AH-4 with a 100' antenna and works very well. I was inspired by HF antennas on ships which all have a tall vertical with an antenna tuner at the base.

This would be a great presentation if it would be edited.

I can't believe that I have stumbled upon your exciting video, we have recently moved back to our home state of Idaho in retirement to an hoa neighborhood after living on 2 plus acres for 30 years, and now I am facing this Exact issue myself. Exact, and we too live in a tri plex with my Shack in the basement. Wow this will be so helpful over the next few months. My immediate issue is finding a path for coax and or ladder line from the attic down to the basement, as no room is directly over another lol, Thanks so much for taking the time to make this video,, !!! Merry Christmas and blessings to you from Idaho!

Thank you for an informative video. Is the amount of RF loss, in the adhesive on the tape, and in the plastic pipe, significant?

Do us a favor and please rerecord this video, all the messing around is distracting.

I tried to make this very antenna from the article in QST. I didn't have a good experience with it.

Great talk, John!

All my antenna's have been and still are 'stealth antenna's,' and I have worked the world using 60 watts J3E, 10 watts A1A.

This is great video Thank you very much for spending your time to help all of us understanding all this subjects you talking about .73 George N9VTB

ham radio is a dying hobby, not directed at you, but ham's need to stop yelling get off my lawn when asked whats up.

Very good video Sir. I learned a lot. How did you find this information Sir ???