|
To those that said it would not work
Remember back when some said my Open Stub J-pole (OSJ) design
Would not work very well. Just take a look at 25 reviews at A HREF="http://www.eham.net/reviews/detail/1613"eHam.net Reviews - OSJ Model J146/440/A or http://www.eham.net/reviews/detail/1613 See if you can find the ONE review that did not give it a 5 out of 5 rating. Changing the way J-Poles are made, "Simply the Best" 73 Al Lowe N0IMW ArrowAntenna.com |
I have built 5 of these antennas for myself, family and friends based on
your webite description and all of them work wonderful. One of my club Members even ran it thru ez nec and it looked great there too. Thanks. John, VE2JDR "Arrow146" wrote in message ... Remember back when some said my Open Stub J-pole (OSJ) design Would not work very well. Just take a look at 25 reviews at A HREF="http://www.eham.net/reviews/detail/1613"eHam.net Reviews - OSJ Model J146/440/A or http://www.eham.net/reviews/detail/1613 See if you can find the ONE review that did not give it a 5 out of 5 rating. Changing the way J-Poles are made, "Simply the Best" 73 Al Lowe N0IMW ArrowAntenna.com |
Hello,
It's always funny to see people saying, "best I have ever used" etc, what must they have used before! It's not really a new design is it, maybe just similar to what is known as a "nest of dipoles" that scanner enthusiasts have. They use different radiating elements in parallel. "Arrow146" wrote in message ... Remember back when some said my Open Stub J-pole (OSJ) design Would not work very well. Just take a look at 25 reviews at A HREF="http://www.eham.net/reviews/detail/1613"eHam.net Reviews - OSJ Model J146/440/A or http://www.eham.net/reviews/detail/1613 See if you can find the ONE review that did not give it a 5 out of 5 rating. Changing the way J-Poles are made, "Simply the Best" 73 Al Lowe N0IMW ArrowAntenna.com --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.703 / Virus Database: 459 - Release Date: 10/06/2004 |
On Thu, 17 Jun 2004 22:25:36 +0100, "jason" wrote:
maybe just similar to what is known as a "nest of dipoles" that scanner enthusiasts have. They use different radiating elements in parallel. Hi Jason, Not that at all, otherwise all of the elements would be driven, and simple observation negates that. I've reported a similar design to this group years ago that uses the SO-239 bulkhead connector wired up in similar fashion: One wire extending directly from the center pin solder tail, and another wire, parallel, soldered to any of the four holes normally used for mounting. No need whatever for the usual JPole tuning cap. 73's Richard Clark, KB7QHC |
In article ,
Richard Clark wrote: maybe just similar to what is known as a "nest of dipoles" that scanner enthusiasts have. They use different radiating elements in parallel. Hi Jason, Not that at all, otherwise all of the elements would be driven, and simple observation negates that. I've reported a similar design to this group years ago that uses the SO-239 bulkhead connector wired up in similar fashion: One wire extending directly from the center pin solder tail, and another wire, parallel, soldered to any of the four holes normally used for mounting. No need whatever for the usual JPole tuning cap. There's an analysis of a similar design on Cebik's web site - his "non-standard J-pole" is a bottom-fed, non-shorted design with a shorter-than-usual radiating section and a longer-than-usual matching leg. http://www.cebik.com/jp1.html It looks to me as if the Arrow design has similar element lengths to the one which Cebik models. The Arrow trick of using one element as the matching leg for 2-meter and as the radiator for 440 is a slick one. Everyone I've spoken with who has used an Arrow 146/440 J-pole has been very happy with it. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
ANYTHING will work!
The question arises how WELL will it work? Without quantification, statements are meaningless. Specially when the weakest parameters are not mentioned in specifications and are not discussed amongst the biassed-in-favour so-called judges. |
can you build a copper pipe beam ant
|
wrote:
I have two. They do work and their performance is no different than and other end fed halfwave, as expected and as modeled. Al gave me one for testing many years ago. Using my Palomar FS1, it tested out better than a 1/4WL and equal to a vertical dipole. I also modeled it using EZNEC with the same results. It is still going strong although, after a decade, the plastic end caps have cracked in the AZ and TX sun. Honestly, that's the only criticism I can think of. Those end caps are of only cosmetic value. -- 73, -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Subject: To those that said it would not work
From: Date: 17, Thursday June, 2004 8:22 PM Message-id: Hi Al, I have two. They do work and their performance is no different than and other end fed halfwave, as expected and as modeled. Also side by side with monoband plumber specials(1/2 cu pipe designs) it is a match, as in no difference. One I use for semiportable ops as it's dual band and easy to mount up on a portable tripod and 15ft of masting. Allison KB1gmx On 17 Jun 2004 16:43:05 GMT, (Arrow146) wrote: As long a the copper pipe one is made correctly and has a choke to cut down on common mode currents. And if the connections are good, etc. And you don't mind the narrow band width. Your right, a 1/2 wave is a 1/2 is a 1/2 wave. All have 0 dBd. 73 Al Lowe N0IMW ArrowAntenna.com |
Subject: To those that said it would not work
From: Date: 17, Thursday June, 2004 11:34 PM Message-id: can you build a copper pipe beam ant Why would I want to ? 73 Al Lowe N0IMW ArrowAntenna.com |
why you a cry baby .
|
Al, where can I get that piece here in Europe??
How about the different Frequency range for our Region? 144-146 and 430 - 440? 73 de OE8SOQ Helmut "Arrow146" schrieb im Newsbeitrag ... | Subject: To those that said it would not work | From: | Date: 17, Thursday June, 2004 8:22 PM | Message-id: | Hi Al, | | I have two. They do work and their performance is no different than | and other end fed halfwave, as expected and as modeled. Also side by | side with monoband plumber specials(1/2 cu pipe designs) it is a | match, as in no difference. One I use for semiportable ops as it's | dual band and easy to mount up on a portable tripod and 15ft of | masting. | | Allison KB1gmx | | On 17 Jun 2004 16:43:05 GMT, (Arrow146) wrote: | As long a the copper pipe one is made correctly and has a choke | to cut down on common mode currents. And if the connections are | good, etc. And you don't mind the narrow band width. | | Your right, a 1/2 wave is a 1/2 is a 1/2 wave. All have 0 dBd. | | 73 Al Lowe N0IMW | ArrowAntenna.com |
"Richard Clark" wrote in message ... On Thu, 17 Jun 2004 22:25:36 +0100, "jason" wrote: maybe just similar to what is known as a "nest of dipoles" that scanner enthusiasts have. They use different radiating elements in parallel. Hi Jason, Not that at all, otherwise all of the elements would be driven, and simple observation negates that. I've reported a similar design to this group years ago that uses the SO-239 bulkhead connector wired up in similar fashion: One wire extending directly from the center pin solder tail, and another wire, parallel, soldered to any of the four holes normally used for mounting. No need whatever for the usual JPole tuning cap. 73's Richard Clark, KB7QHC Yep this has been around a long time. Got one in my junk bin made of coathangers and N connector for two meters It worked so much better than my rubber duckie antenna I thought it was the greatest antena in the world.. |
wrote in message ... On 17 Jun 2004 16:43:05 GMT, (Arrow146) wrote: Remember back when some said my Open Stub J-pole (OSJ) design Would not work very well. Just take a look at 25 reviews at Hi Al, I have two. They do work and their performance is no different than and other end fed halfwave, as expected and as modeled. Also side by side with monoband plumber specials(1/2 cu pipe designs) it is a match, as in no difference. One I use for semiportable ops as it's dual band and easy to mount up on a portable tripod and 15ft of masting. It is as it claims and does as claims. Though it does real well in the "survived a month banging around loose in the back of a pickup test". I wanted more gain I'd do a 6db colinear but they are 3x longer and the cheap ones are fragile and the good ones really cost. Allison KB1gmx My only problem with J antennas is WHY. I can more easily build a 5/8. |
Hi Al -
Your antenna is excellent in every way. I have two of them that I'm thrilled with. And after our local ARES/RACES group saw mine, they ordered ten more for other members of the group. I confess to smiling a bit when I found out that my J146/440 at 20 feet is about 6 dB stronger into the local repeater than our EOC station's Comet "gain" antenna at 50 feet. (Obviously, this cannot be a direct A/B comparison; but both stations have a clear shot to the repeater, and they are closer to it than I am.) Don't let the nattering nabobs of negativism in this NG get you down. Many of them are so stuck in their ways, I'm surprised they haven't reprised their stock answer of "use ladder line and a tuner to feed a 135 foot dipole" as the hot ticket for 146/440 coverage. ;-) 73, Ed "Arrow146" wrote in message ... Remember back when some said my Open Stub J-pole (OSJ) design Would not work very well. Just take a look at 25 reviews at A HREF="http://www.eham.net/reviews/detail/1613"eHam.net Reviews - OSJ Model J146/440/A or http://www.eham.net/reviews/detail/1613 See if you can find the ONE review that did not give it a 5 out of 5 rating. Changing the way J-Poles are made, "Simply the Best" 73 Al Lowe N0IMW ArrowAntenna.com |
My only problem with J antennas is WHY. I can more easily build a 5/8.
What your really asking is why a half wave vs a 5/8ths? The best answer I can give is a 5/8ths REQUIRES a groundplane to work at all correctly and that makes it more metal and complication. Yes the 5/8ths offers _some_ additional gain but for simplicity the end fed dipoles (all the J varients) do not require a ground plane and are more compact in general shape making them a better candiate for steath or portable ops. Seriously if I were going for more gain than the OSJ the antenna would be a 4 bay dipole for the same reasons. Rugged, simple, excellent gain and good radiation pattern. The 5/8ths does not offer enough gain increase to make it worth the effort when a 5.6db colinear or 4 bay dipole offers significantly more. Allison KB!GMX Wow, Good Answer, I totally agree. I tested several different 5/8 wave antenna, I even made a prototype that worked as well or better than any of them, and looked better. But comparing them to the OSJ it was hard to tell the difference, maybe a 1/2 "S" Unit in favor of the 5/8 wave. With the difference in cost to make, (Labor & Material) it just did not see worth the effort to me. 73 Al Lowe N0IMW A HREF="http://ArrowAntennas.com"ArrowAntenna.com/A |
wrote in message ... On Sun, 20 Jun 2004 17:38:26 GMT, "Jimmie" Gfender@carolina dot.rr.dot com wrote: My only problem with J antennas is WHY. I can more easily build a 5/8. What your really asking is why a half wave vs a 5/8ths? The best answer I can give is a 5/8ths REQUIRES a groundplane to work at all correctly and that makes it more metal and complication. Yes the 5/8ths offers _some_ additional gain but for simplicity the end fed dipoles (all the J varients) do not require a ground plane and are more compact in general shape making them a better candiate for steath or portable ops. Seriously if I were going for more gain than the OSJ the antenna would be a 4 bay dipole for the same reasons. Rugged, simple, excellent gain and good radiation pattern. The 5/8ths does not offer enough gain increase to make it worth the effort when a 5.6db colinear or 4 day dipole offers significantly more. Allison KB!GMX Funny, I dont remember saying anything about gain. For me 5/8 are just easier to build and tune. |
wrote in message ... On Sun, 20 Jun 2004 17:38:26 GMT, "Jimmie" Gfender@carolina dot.rr.dot com wrote: My only problem with J antennas is WHY. I can more easily build a 5/8. What your really asking is why a half wave vs a 5/8ths? The best answer I can give is a 5/8ths REQUIRES a groundplane to work at all correctly and that makes it more metal and complication. Yes the 5/8ths offers _some_ additional gain but for simplicity the end fed dipoles (all the J varients) do not require a ground plane and are more compact in general shape making them a better candiate for steath or portable ops. Seriously if I were going for more gain than the OSJ the antenna would be a 4 bay dipole for the same reasons. Rugged, simple, excellent gain and good radiation pattern. The 5/8ths does not offer enough gain increase to make it worth the effort when a 5.6db colinear or 4 day dipole offers significantly more. Allison KB!GMX Funny, I dont remember saying anything about gain. For me 5/8 are just easier to build and tune. |
wrote in message ... On Fri, 25 Jun 2004 15:29:32 GMT, "Jimmie" Gfender@carolina dot.rr.dot com wrote: Funny, I dont remember saying anything about gain. For me 5/8 are just easier to build and tune. Still it needs a ground plane and that does add mechanical complication of a different sort. Not much on two meters, use 3/4 inch wooden dowl or acrylic rod for supporting 3/4 inch tublar radiator. This also becomes the coil form for thre matching coil. Groudplane can be anythinh from stiff wire held on by a radiator clamp to a metal roof. Even with the radials going nearly straight down from the antenna it seems to work pretty well. Ive cobbled these to gether in an hour or so and have spent all evening making one look pretty. They both worked well and gave long service. Constuction goes a lot faster once you get some experience on where to tap the coil and know how many turns, One day I am going to write this down when I make one.However I find that figuring the right lengths for the 5/8 is not nearly as fussy as doing a J from scratch I dont mind J antennas a a horizontal dipole on HF where the stub length is convinent to handle. This can be a problem when you get on down in freq. I can use one on 20 meters at this freq the stub works well as my transmission line. For me J's work from 6m trhough 20 meters. Wouldnt dream of actually buying one though. I've built both and for differing reasons each works well when well made. I find making a 5/8ths harder to achive for say 2m or 6m out of copper pipe than a J. Allison KB!GMX |
wrote in message ... On Fri, 25 Jun 2004 15:29:32 GMT, "Jimmie" Gfender@carolina dot.rr.dot com wrote: Funny, I dont remember saying anything about gain. For me 5/8 are just easier to build and tune. Still it needs a ground plane and that does add mechanical complication of a different sort. Not much on two meters, use 3/4 inch wooden dowl or acrylic rod for supporting 3/4 inch tublar radiator. This also becomes the coil form for thre matching coil. Groudplane can be anythinh from stiff wire held on by a radiator clamp to a metal roof. Even with the radials going nearly straight down from the antenna it seems to work pretty well. Ive cobbled these to gether in an hour or so and have spent all evening making one look pretty. They both worked well and gave long service. Constuction goes a lot faster once you get some experience on where to tap the coil and know how many turns, One day I am going to write this down when I make one.However I find that figuring the right lengths for the 5/8 is not nearly as fussy as doing a J from scratch I dont mind J antennas a a horizontal dipole on HF where the stub length is convinent to handle. This can be a problem when you get on down in freq. I can use one on 20 meters at this freq the stub works well as my transmission line. For me J's work from 6m trhough 20 meters. Wouldnt dream of actually buying one though. I've built both and for differing reasons each works well when well made. I find making a 5/8ths harder to achive for say 2m or 6m out of copper pipe than a J. Allison KB!GMX |
| All times are GMT +1. The time now is 07:53 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com