[amsat-bb] Fw: ELK or ARROW
jdanehy at cinci.rr.com
Sat Dec 27 18:33:29 PST 2008
. there is the old adage that you get what you pay for . . . why buy a
poorly designed antenna that does not work very well
> If you have a 5 element yagi that only produces 4 dbi you are not getting
> what you paid for . . . most 2 element yagis would out perform that
> statistic . . . a 5 element yagi should be at least 9 db + or 10 db dbd
> (dipole ) not isotropic . . . . there is something that is called
> MERCHANTABILITY . . .i.e., an IMPLIED WARRANTY that you are getting at
> least the minimum for your money . . .
> 4 dbi for an Arrow is way off base . . . so it is not just ; you can not
> afford a Cadillac but you are not even getting a Ford or Chevy . . i.e.,
> the gain of a 5 element yagi on 435 mhz . . . that is the issue, not cost
> alone . . . . . . same comments apply to the ELK but I have attempted to
> make the point that there is a minimum performance for a certain number of
> elements that is pretty OBJECTIVE and when it is not met . . . . well
> that is my point . . . these two antennas have shown to some testers that
> they do not measure up to the minimum EXPECTATIONS . . .unfortunately that
> is acceptable to some . . . . then it becomes acceptable to many . . .
> and objectivity is abandoned . . .
> Jim W9VNE
> ----- Original Message -----
> From: "Trey Brown" <palintheus at gmail.com>
> To: "Jim Danehy" <jdanehy at cinci.rr.com>
> Sent: Saturday, December 27, 2008 6:39 PM
> Subject: Re: [amsat-bb] ELK or ARROW
>> Thanks for the comments. Realize, though, that not everyone wants or
>> can afford to have the Cadillac.
>> On Sat, Dec 27, 2008 at 4:06 PM, Jim Danehy <jdanehy at cinci.rr.com> wrote:
>>> the Arrow antenna has been critiqued by Kent Britain, WA5VJB
>>> he says that some have measured the Arrow for gain on 435 mhz @ 4 dbi
>>> (isotropic) . . . . and that further analysis showed that for the
>>> element lengths used on 435 mhz that it peaks at 457 mhz and not 435 mhz
>>> . . . Kent is a well respected VHF/UHF antenna person who has plenty of
>>> credibility . . .
>>> Kent opines that the Arrow, as built does not have its elements
>>> insulated from the boom. It uses dimensions for insulated elements . . .
>>> so much for the Arrow . . . .
>>> Now for the ELK : a local friend of mine owns an Arrow and he uses it
>>> successfully. He bought an ELK and attempted to compare the Arrow and
>>> the ELK . . . . he could not make an across town QSO on 435 mhz from his
>>> second story window with the ELK , so he sent the ELK back for a refund
>>> I have worked and exchanged QSLs with several hundred satellite users .
>>> . .the majority of the folks that have worked and QSLed me (close to 250
>>> + ) have been using either the Arrow or ELK based upon the information
>>> on their cards. So they are popular. Are they optimum ? A lot of
>>> anecdotal information would seem to say NO . . .
>>> Thirty-five years ago I worked Oscar 6 with a homebrew 2 mtr yagi that
>>> probably was worse than either the Arrow or Elk but I worked YV and KL7
>>> from Indiana on CW with about 15 watts to the 3 elements which my XYL
>>> waved around at my directions . . . not any more . . .what do I use
>>> these days : a pair of circular polarity yagis on 10 foot booms
>>> manufactured by M Square . . . .
>>> Folks ask what should they buy ? Maybe a Ford or maybe a Chevy . . .
>>> neither is a Cadillac . . . .
>>> Jim W9VNE
>>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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>> Trey -- N5THX
>> They who can give up essential liberty to obtain a little temporary
>> safety, deserve neither liberty nor safety.
>> - Benjamin Franklin
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