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GET /hyperkitty/api/list/[email protected]/email/3MXC3DZR7R5JN75A3447O24SK3ZNM6EG/?format=api
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3MXC3DZR7R5JN75A3447O24SK3ZNM6EG/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "122820080330.10188.4956F2DB00013CD2000027CC22230706129B0A02D2089B9A019C04040A0DBF049BCC02@att.net", "message_id_hash": "3MXC3DZR7R5JN75A3447O24SK3ZNM6EG", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZYHTEA672NKT4PID6VEJLWRMVA6UINFU/?format=api", "sender": { "address": "n3tl (a) bellsouth.net", "mailman_id": null, "emails": null }, "sender_name": "[email protected]", "subject": "[amsat-bb] Re: Fw: ELK or ARROW", "date": "2008-12-28T03:30:35Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TD4GEDCZX3MKMHTHSFEQYUE3LVXPLUXJ/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Mr. Mc Bride,\n\nThank you for this post. It led me to a Google search, which provide a great starting point to go along with Item No. 3 in your post. It is:\n\nhttp://www.dxzone.com/catalog/Software/Antenna_analysis/\n\nThank you again,\n\nTim - N3TL\n-------------- Original message from \"Art McBride\" <[email protected]>: -------------- \n\n\n> To All, \n> 1. Amateur Radio is learning by doing. \n> 2. A large amount of data on Yagi type antennas exists, easily found, and is \n> well proven. \n> 3. Several design programs for antennas exist reducing construction time and \n> waist of materials. \n> 4. Equipment to measure comparative antenna performance at VHF/UHF \n> frequencies is not hard to find. \n> \n> Why do we line the pockets of some poorly designed antenna manufacturing \n> companies instead of learning how and making the best performing antennas \n> for our own use? If we do not learn these skills, no one will be left to \n> teach and the skills will be lost. \n> \n> There are many older Amateurs willing to teach those that want to learn, and \n> hopefully many of those wanting to learn are at least one half of the age of \n> those who can teach! \n> \n> Art, \n> KC6UQH \n> \n> -----Original Message----- \n> From: [email protected] [mailto:[email protected]] On \n> Behalf Of Jim Danehy \n> Sent: Saturday, December 27, 2008 6:33 PM \n> To: [email protected] \n> Subject: [amsat-bb] Fw: ELK or ARROW \n> \n> \n> . there is the old adage that you get what you pay for . . . why buy a \n> poorly designed antenna that does not work very well \n> > ? \n> > \n> > If you have a 5 element yagi that only produces 4 dbi you are not getting \n> \n> > what you paid for . . . most 2 element yagis would out perform that \n> > statistic . . . a 5 element yagi should be at least 9 db + or 10 db dbd \n> > (dipole ) not isotropic . . . . there is something that is called \n> > MERCHANTABILITY . . .i.e., an IMPLIED WARRANTY that you are getting at \n> > least the minimum for your money . . . \n> > 4 dbi for an Arrow is way off base . . . so it is not just ; you can not \n> > afford a Cadillac but you are not even getting a Ford or Chevy . . i.e., \n> \n> > the gain of a 5 element yagi on 435 mhz . . . that is the issue, not cost \n> \n> > alone . . . . . . same comments apply to the ELK but I have attempted to \n> > make the point that there is a minimum performance for a certain number of \n> \n> > elements that is pretty OBJECTIVE and when it is not met . . . . well \n> > that is my point . . . these two antennas have shown to some testers that \n> > they do not measure up to the minimum EXPECTATIONS . . .unfortunately that \n> \n> > is acceptable to some . . . . then it becomes acceptable to many . . . \n> > and objectivity is abandoned . . . \n> > \n> > Jim W9VNE \n> > \n> > \n> > ----- Original Message ----- \n> > From: \"Trey Brown\" \n> > To: \"Jim Danehy\" \n> > Sent: Saturday, December 27, 2008 6:39 PM \n> > Subject: Re: [amsat-bb] ELK or ARROW \n> > \n> > \n> >> Thanks for the comments. Realize, though, that not everyone wants or \n> >> can afford to have the Cadillac. \n> >> \n> >> \n> >> On Sat, Dec 27, 2008 at 4:06 PM, Jim Danehy wrote: \n> >>> the Arrow antenna has been critiqued by Kent Britain, WA5VJB \n> >>> \n> >>> http://wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf \n> >>> \n> >>> he says that some have measured the Arrow for gain on 435 mhz @ 4 dbi \n> >>> (isotropic) . . . . and that further analysis showed that for the \n> >>> element lengths used on 435 mhz that it peaks at 457 mhz and not 435 mhz \n> \n> >>> . . . Kent is a well respected VHF/UHF antenna person who has plenty of \n> >>> credibility . . . \n> >>> \n> >>> Kent opines that the Arrow, as built does not have its elements \n> >>> insulated from the boom. It uses dimensions for insulated elements . . . \n> \n> >>> so much for the Arrow . . . . \n> >>> \n> >>> Now for the ELK : a local friend of mine owns an Arrow and he uses it \n> >>> successfully. He bought an ELK and attempted to compare the Arrow and \n> >>> the ELK . . . . he could not make an across town QSO on 435 mhz from his \n> \n> >>> second story window with the ELK , so he sent the ELK back for a refund \n> >>> . \n> >>> \n> >>> I have worked and exchanged QSLs with several hundred satellite users . \n> >>> . .the majority of the folks that have worked and QSLed me (close to 250 \n> \n> >>> + ) have been using either the Arrow or ELK based upon the information \n> >>> on their cards. So they are popular. Are they optimum ? A lot of \n> >>> anecdotal information would seem to say NO . . . \n> >>> \n> >>> Thirty-five years ago I worked Oscar 6 with a homebrew 2 mtr yagi that \n> >>> probably was worse than either the Arrow or Elk but I worked YV and KL7 \n> >>> from Indiana on CW with about 15 watts to the 3 elements which my XYL \n> >>> waved around at my directions . . . not any more . . .what do I use \n> >>> these days : a pair of circular polarity yagis on 10 foot booms \n> >>> manufactured by M Square . . . . \n> >>> \n> >>> Folks ask what should they buy ? Maybe a Ford or maybe a Chevy . . . \n> >>> neither is a Cadillac . . . . \n> >>> \n> >>> Jim W9VNE \n> >>> _______________________________________________ \n> >>> Sent via [email protected]. Opinions expressed are those of the author. \n> >>> Not an AMSAT-NA member? Join now to support the amateur satellite \n> >>> program! \n> >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n> >>> \n> >> \n> >> \n> >> \n> >> -- \n> >> Trey -- N5THX \n> >> \n> >> They who can give up essential liberty to obtain a little temporary \n> >> safety, deserve neither liberty nor safety. \n> >> - Benjamin Franklin \n> >> \n> > \n> \n> _______________________________________________ \n> Sent via [email protected]. Opinions expressed are those of the author. \n> Not an AMSAT-NA member? Join now to support the amateur satellite program! \n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n> \n> __________ Information from ESET NOD32 Antivirus, version of virus signature \n> database 3719 (20081227) __________ \n> \n> The message was checked by ESET NOD32 Antivirus. \n> \n> http://www.eset.com \n> \n> \n> \n> \n> __________ Information from ESET NOD32 Antivirus, version of virus signature \n> database 3719 (20081227) __________ \n> \n> The message was checked by ESET NOD32 Antivirus. \n> \n> http://www.eset.com \n> \n> \n> _______________________________________________ \n> Sent via [email protected]. Opinions expressed are those of the author. \n> Not an AMSAT-NA member? Join now to support the amateur satellite program! \n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n", "attachments": [] }