Dang. Incredible engineering. New Technician here and found this because I want to learn as much as I can about antenna design before taking my General. I have always wondered about how transmission antennas work and now I have the motivation to learn and internalize it.
Just some new guy here trying to learn what cb and gmrs is..found this video..have no idea what this guy is saying...might as well be another language..but I'm fascinated....all I know is..he needs to pass this knowledge to the next generation..so I might learn one day b4 I die lol..
Noticed center conductor is drawn connected to the long leg of the J-pole where so many implementations have it on the short length. Is there a reason?
If the 50 ohm point is at 1.25" on the matching stub at 2 meters (146 mHz), how can that same point be 50 ohms at 3 times the frequency (70cm; 440 mHz)?
Your talks are greatly appreciated. Thanks much. I need some clarification on the lightning comment. Why couldn't lightning strike the J-Pole, flow down the coax, through my radio (frying it) and finally to earth ground?
Wow such a wonderful presentation. Now I am ready to try to build my own. But did I hear this correctly that there is an outline of how to build and test alone the way?
That’s lovely. But I can build a VHF and UHF antenna pair with 6dB gain for a TOTAL of $10 with an SO-239 and some cheap 3/32” brazing rod. Works fine and is VERY stealthy.
It's ok if it is promo for products that I may be interested- who knows, maybe I discover something that i'd never have exposure to if not for content such as this. But, I regress....having advertising in a way forced on its viewers in disguise of content- well, there's only so much that is tolerable... Television programming is regulated with certain "best practices" for these very reasons... otherwise all we'd be watching are advertisements...but with plots...wait a second... *puts on my dark sunglasses/ shades ***"buy buy buy- spend money $ $ $ $ $ buy obey obey *** ... Yup, nothing has changed... (*referencing the great classic 1988 movie by John Carpenter titled, " They Live " starring Rody Piper)
Dang. Incredible engineering. New Technician here and found this because I want to learn as much as I can about antenna design before taking my General. I have always wondered about how transmission antennas work and now I have the motivation to learn and internalize it.
Thank you Dr. Fong, and SFARC for hosting him. Great info.
Ed’s excitement is contagious.
I learned more from this video about antenna theory than I have reading and studying for my Extra exam Thank you sir!
Just some new guy here trying to learn what cb and gmrs is..found this video..have no idea what this guy is saying...might as well be another language..but I'm fascinated....all I know is..he needs to pass this knowledge to the next generation..so I might learn one day b4 I die lol..
AmaZing! I spoke with dr Fong earlier today - very nice person
This was a fantastic presentation!
New HAM here. Thanks so much for posting!!!
Noticed center conductor is drawn connected to the long leg of the J-pole where so many implementations have it on the short length. Is there a reason?
Great presentation, Thank you
If the 50 ohm point is at 1.25" on the matching stub at 2 meters (146 mHz), how can that same point be 50 ohms at 3 times the frequency (70cm; 440 mHz)?
Your talks are greatly appreciated. Thanks much. I need some clarification on the lightning comment. Why couldn't lightning strike the J-Pole, flow down the coax, through my radio (frying it) and finally to earth ground?
Hi Mr Ed -- does the DBJ-UHF +5dB GMRS Base Antenna need any Ferrite Rings attached to the Coax ?
Wow such a wonderful presentation. Now I am ready to try to build my own. But did I hear this correctly that there is an outline of how to build and test alone the way?
Very good, excellent info!
Is there any way for 5/8 wave over 1/4 ? 5/8 has best gain for vertical? Plus great pattern
Is there a NanoVNA that is of particularly better quality than the others?
Understanding that “it’s not a short at resonance” was a big AH-HA!
Is it practical to build the dual band with RG58? If yes, please provide a description or demonstration.
Mr. Don't is the best.
Can I run Ed's tri-band and also use it for GMRS (462-467) if I have a really good tuner?
Not sure why you'd need/want a tri-band GMRS antenna, but if you want it to work at both 440 and 462, that might be a tall order.
@@adubs. Emergency services.. being able to cover both ham, GMRS, and emergency freqs.. But I'm just looking for 2m, 70cm and 65cm (GMRS) for xmit.
❤
That’s lovely. But I can build a VHF and UHF antenna pair with 6dB gain for a TOTAL of $10 with an SO-239 and some cheap 3/32” brazing rod. Works fine and is VERY stealthy.
Please do share. Would love to do this
💕 Promo'SM
It's ok if it is promo for products that I may be interested- who knows, maybe I discover something that i'd never have exposure to if not for content such as this. But, I regress....having advertising in a way forced on its viewers in disguise of content- well, there's only so much that is tolerable... Television programming is regulated with certain "best practices" for these very reasons... otherwise all we'd be watching are advertisements...but with plots...wait a second...
*puts on my dark sunglasses/ shades
***"buy buy buy- spend money $ $ $ $ $ buy obey obey ***
... Yup, nothing has changed...
(*referencing the great classic 1988 movie by John Carpenter titled, " They Live " starring Rody Piper)