They are not. Without markings or other things to reference by all you can do is measure current focal length and find a feed that matches that focal length or adjust the new feed to the same focal length because the parabolic curve determines where the focus point is on the dish/grid and different manufactures can have slightly different parabolic curve on theirs but one good thing is that a lot of grids and dishes sold on the market today are sourced from a few true manufactures so brand X dish might be the same as Brand Z the only difference between them is the feed itself where brand X makes their own and Brand Z uses the Chines developed/copied design.
Most mfgs have some kind of marking or labeling on them but weather will kill the labeling over time and you have to rely on the markings but to understand the markings one have to know the make which might be as easy to figure out as trying to read the weather beaten label. / Eje -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Josh Luthman Sent: Wednesday, October 21, 2009 10:33 AM To: WISPA General List Subject: Re: [WISPA] Identifying 2ft dish frequency Are all parabolic grids the same visually? I would expect the mounting hardware to be most distingushable. Do you mean you can NOT depend on a lot of things, Scott? >From what I've picked up on this thread is there is no real way to identify a dish nor feedhorn for polarity/frequency. Stickers are a must. Hear that manufacturers? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 "When you have eliminated the impossible, that which remains, however improbable, must be the truth." --- Sir Arthur Conan Doyle On Wed, Oct 21, 2009 at 11:30 AM, Scott Reed <scottr...@onlyinternet.net>wrote: > Feed length is based on dish size; where does the parabola focus. > Nothing to do with frequency, everything reflects the same. > Size of the feed horn isn't always an indicator either. Can depend on a > lot of things. > > Josh Luthman wrote: > > The feedhorn specifically. Maybe the length will help you too. I know > with > > higher gain the 5GHz grids are noticeably longer. > > > > Josh Luthman > > Office: 937-552-2340 > > Direct: 937-552-2343 > > 1100 Wayne St > > Suite 1337 > > Troy, OH 45373 > > > > "When you have eliminated the impossible, that which remains, however > > improbable, must be the truth." > > --- Sir Arthur Conan Doyle > > > > > > On Wed, Oct 21, 2009 at 10:48 AM, Brad Belton <b...@belwave.com> wrote: > > > > > >> Hmmm, pretty sure a 2' dish is a 2' dish regardless of frequency...or > are > >> you speaking of the diameter of the feed? > >> > >> Best, > >> > >> > >> Brad > >> > >> -----Original Message----- > >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > >> Behalf Of Josh Luthman > >> Sent: Wednesday, October 21, 2009 9:40 AM > >> To: WISPA General List > >> Subject: Re: [WISPA] Identifying 2ft dish frequency > >> > >> Can you measure diameter and compare it with the 2.4 and 5.8 GHz dishes? > >> Never thought about it but they would have to be different sizes. > >> > >> Josh Luthman > >> Office: 937-552-2340 > >> Direct: 937-552-2343 > >> 1100 Wayne St > >> Suite 1337 > >> Troy, OH 45373 > >> > >> "When you have eliminated the impossible, that which remains, however > >> improbable, must be the truth." > >> --- Sir Arthur Conan Doyle > >> > >> > >> On Wed, Oct 21, 2009 at 10:34 AM, Mark McElvy <mmce...@accubak.com> > wrote: > >> > >> > >>> I happen to know they are either 5.8 or 2.4 as this was the only > >>> equipment I have found of theirs, they left it all when they went out > of > >>> business. > >>> > >>> Mark McElvy > >>> AccuBak Data Systems, Inc. > >>> 573.729.9200 - Office > >>> 573.729.9203 - Fax > >>> 573.247.9980 - Mobile > >>> http://www.accubak.com/ > >>> http://www.accubak.net/ > >>> Nationwide Internet Access > >>> Accurate backups for your critical data! > >>> > >>> > >>> -----Original Message----- > >>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] > On > >>> Behalf Of ccrum > >>> Sent: Wednesday, October 21, 2009 9:29 AM > >>> To: WISPA General List > >>> Subject: Re: [WISPA] Identifying 2ft dish frequency > >>> > >>> Got a spectrum analyzer and a frequency generator? Or a good network > >>> analyzer will do, but most people don't have one laying around. The > >>> feeds could literally be anything. You might be better off just calling > >>> the MFG of the dish and buying new feeds in the range you want unless > >>> you you have a few hours of extra time on your hands. > >>> > >>> Cameron > >>> > >>> Mark McElvy wrote: > >>> > >>>> I have 4 two ft dishes that where pulled down when the previous wisp > >>>> went out of business. There are no markings on them and I need to > >>>> determine frequency and polarity. > >>>> > >>>> > >>>> > >>>> Mark McElvy > >>>> AccuBak Data Systems, Inc. > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>> > ------------------------------------------------------------------------ > >>> -------- > >>> > >>>> WISPA Wants You! 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