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Info packed

Thanks for the explanation John. I always wondered how they could have a transmitter and a receiver with only 600 kHz separation on the same antenna. Yes, they told me that they used cavity duplexers, but somehow it was a mystery to me how they worked. 73 de Johan, PA3BVB

Ham radio never seemed so exciting as you present it Natalie. Great job, KD6M

Wow this guy has to be able to talk anywhere he wants. Really impressive setup he has.

Great job Tim, you are a real HAM!

Very nice presentation, but there was one key consideration in antenna design and implementation that was not mentioned: Radiation pattern. This presentation focused on getting the SWR of the antenna low enough to be handled by the antenna tuners in modern rigs, but it ignored where the signal is actually radiating. It would have been really nice to see the radiation patterns of the various antenna designs. Some of them, I'm quite confident, are "cloud warmers", while others (at the right height and on the right band) would perform decently for DX.

for testing the loop with a field strength meter/magnetometer , etc in the far field. The inverse square law states that for a point source of waves that is capable of radiating omnidirectionally and with no obstructions in the vicinity, the intensity I decreases with the square of the distance, d, from the source.

for everyone's perusal

interesting and insightful, thank you very much !!

Does anyone know the fitting for the 1"pvc tuning pipe? Is it a cap thats drilled or a coupler?

Why not do a horizonal loop?

I need to figure out how to talk to people. I have been scanning. I have my gmrs but want to get my ham.

Thoughts on using aluminum downspout material for this project? Paint can be removed for connections

This is good info but there seems to be zero actual builds or examples detailed which are using these ideas on the internet to see if they actually work or not.

Does anyone know the title of the "IEEE Study" he refers to on not matching the receive only antenna?

Thank you very much. 💪🇺🇸👍

Amazing info. Thanks!

Glam Ham! 😃

I got here, from your tik tok live, plug. 😉

Thank you for having me! And for being such a great ham club 😁📻👍

John, your first video you specify a skin debt for 40 meters to 1.2 and on this video you change to 3x at 3.6 mils. In determining thickness of aluminum or cu tape the aluminum should be at least 3.6 mils thick for 40 meters? May I also ask if this loop will work with an sdr rspdx as at this point I will only be using it to receive not transmit?

Whatn does COVID have anything to do with operating a radio. Its a singular hobby. Spread some COVID through thr airwaves. Haha

I don't know much about loops, obviously, and I am confused about how to feed this antenna? what is the center conductor of my coax attached to and what is the shield connected to?

I was married to a man named Bobby Bryce Heil.He died in 1993 .I still miss him.

On the foil tape. Do you need to do anything about the adhesive where the tape overlaps? I don’t think that tape is made to specifically be conductive so the adhesive may not be conductive either and the overlapping portions may not be making a good connection.

If square gets you more area, then wouldn't building a square shape loop but with 3x3 or 2x2 boards and covering with aluminum tape for more surface area of the loop?

Wow…much needed info!

After 40 years of fooling with loops, I thought I knew everything I needed to know, but I was taking notes on this presentation. :)

secret, purchase a Palomar noise filter for $129. buy a palomar common noise choke...lol...choke? I meant joke. he already robbed me of 400+ dollars.

Wire Length (feet) 68-73, 85, 92, 102, 120-125 Minimum Coax Length (feet) 65

I run the Bullet 9:1 with an 85' wire, 20' vertical, 65' horizontal (inverted L), with two 15' radials, and choke on the coax at 50'. Works great.

Absolutely nailed it! Thank you... Best presentation to date by far on the web! Palomar has been part of this arsenal for many many years. Years before I even had my ticket. As usual fashionably late to the meet but glad I caught this one ✌

NVIS antennas are less than 10 feet high, except in the case of the 2259's since they are inverted vee they are 12 feet at the top. This fact comes from years of experience, not some theorist and flawed eznec's.

Hi, I have had my license for a long time, mostly for 2M work with the local network for hurricane shelter emergency work. But now I am retired and going to move into a bus I am converting and sell my condo <the main reason I have not been active, condo rules.> I have been watching "mag loop" antenna development and was considering one for the roof of the bus and one on the roof of my jeep. But I had been figuring on laying them horizontally for nondirectional use but you are the first person I have heard say they wont work horizontally. I was just wondering why they won't work as well horizontally as they do vertically. The radiation pattern for the loop would be nice if they did work horizontally. I can make them tip up and put a rotator <tv type> on them. But that would make them only usable when not on the road.

I wonder what *edge* skin effect is? I cannot find any mention in my sources- . The antenna at 55:43 did not look too bad for me. Except very thin see through conductive material.

Excellent video. KO4ESA/WRJR757

Excellent video. KO4ESA/WRJR757

Just picked up this very antenna

Excellent from a practical genius 🎉! Thanks 🙏 a lot sir

I cannot find the microbeam antenna anywhere for sale can you help me out

Wow. Talk about drinking from the firehose...

At 42:25 (Question #1) he says EFHW antennas don’t work on odd multiples of the fundamental frequency. That is incorrect.

I used to have a 40m NVIS dipole up in my back yard. 7' off the ground, with 3 reflector wires laid in the grass underneath it. I heard that those help out a lot, but not sure. Anyway, I would get "40 over" reports throughout Texas and into Arkansas (which was off of the NE-pointing end of that dipole) from my QTH in central Texas. I used to blow other operators minds with my booming, 100W signal. 😆

WOW , Bob just got your 71' antenna , that bullet picture does not do justice to that bullet, I can tell it's quality just by the weight of the goodies in it, and that Maxi -chocker is also awesome, I can tell you put quality ferrites in it. I will post once I get it installed. runs circle around the first radio-wazs I got 2 years ago at hro wen I bought all my gear from Bob in Anaheim.

Nice informative video. BUT... after I ordered an in-stock wire antenna from them, find that their customer service is nonexistent, terrible. After waiting 2 weeks for an antenna... nothing, zippo, nada, they hadn't even shipped it yet. Probably won't be buying anything else from them.

Discovering RF choke at the transceiver end of things really reduced my receive noise level. I made one from 30 (!) 6mm ferrite beads threaded onto a piece of good quality RG58 with a gap between each and then heatshrunk over so its like a flexible patch lead. I combined that with a G3SEK mains filter and ferrites on all the switch mode 5v power supplies in the house. Got my noise level down from S8 to S2 on HF. GM4SVM

Such a complex subject for lay people like me, but master Jhon Portune, with his mastery, managed to convey the content in a simple and motivating way.

Are the cavities the tubes, in this case, four were used?

Cavity is a part of the duplexer?

I lack words to thank the attention that Mr. Jhon Portune gave me when I sent him some questions by email. I want to say that it was through his book that my interest in understanding the operation of a duplex filter was awakened.