Dang, well I picked up the pallet of antennas and it looks like they're the CELLMAX-EXT-CPU which only cover 806–960 MHz and 1710–2200 MHz :( . Hey but on the plus side, they contain tee couplers that are rated for the full 698–960 MHz and 1710–2700 MHz. I've needed a 2.4Ghz coupler for a while now and that alone was worth the minimum bid for me. With one of those, a noise source and a spectrum analyzer, I can start characterizing Wifi/Bluetooth antennas. The antenna design is relatively simple and pretty cool looking. It would be interesting to try and simulate the design and see how much would have to change in order to extend the range. Also, if anyone wants to build a phase arrayed radar system... On Fri, Oct 28, 2016 at 6:57 PM, Marc Juul <juul(a)labitat.dk> wrote: _______________________________________________ mesh mailing list mesh(a)lists.sudoroom.org https://sudoroom.org/lists/listinfo/mesh

Martin, a diplexer is a device to feed one antenna from two transcievers, since it splits signals according to their frequencies. https://en.wikipedia.org/wiki/Diplexer you might be thinking of a splitter. John, i have a really nice 2.4GHz directional coupler by Narda, it has four ports unlike the slightly similar one in this picture: http://www.recycledgoods.com/media/catalog/product/cache/1/i mage/1000x/af097278c5db4767b0fe9bb92fe21690/n/a/narda- microwave-corp.-3002-30-coaxial-directional-coupler-2.0-ghz-1.27.jpg you can borrrow it if you want, I also have attenuators and stuff like that. -jake On Thu, 3 Nov 2016, Martin wrote: John, > > The coupler you got is probably a diplexer - a device to feed two antennas > with one cable. > > To do the testing that you're thinking of requires a directional coupler > like this: http://www.ebay.com/itm/Mini-Circuits-Coaxial-RF-Direc > tional-Coupler-ZADC-13-2000-1-13dB-SMA-50-Ohm-NEW-/291379146 > 740?hash=item43d78ceff4:g:A0IAAOSwqu9U2rgN The seller claims that the > units were tested to 2800 MHz and worked. This is a pretty good deal. > > For the noise source you can use one of these: http://www.ebay.com/itm > /DC-12V-0-3A-SMA-noise-source-Simple-spectrum-external- > tracking-source-DY2-/172150915301?hash=item2814fe80e5:g:OaUAAOSwI3RW-t7N > > You don't need a spectrum analyzer - a Hack-RF or similar SDR will do. > Connect the noise source to the directional coupler input and the antenna > to the coupler output. Attach the SDR to the coupler's coupled port. > With > your favorite SDR software tune your radio to mid-band (2.442 - 2.447 > GHz). Note the receiver power level. Reverse the antenna and noise > source, repeat measurement. The larger number is the power delivered to > the antenna, the smaller is power reflected back from the antenna. You > can > use an online calculator like this http://rfcalculator.mobi/ > vswr-forward-reverse-power.html to calculate VSWR. The ideal VSWR is one > and an antenna with greater than three should not be used. > > Although the antennas are only rated to 2.2 GHz they may be usable at 2.4 > GHz. Check the VSWR. > > The antennas are probably useful for hams (there's a 902.005 MHz through > 927.995 MHz band). I can ask around and see if there's is any interest. > You might want to put one one ebay and see if there's a market. > > --Martin > > > On Thu, Nov 3, 2016 at 1:14 PM, John Fitz <johnfitzeecs(a)gmail.com> wrote: > > Dang, well I picked up the pallet of antennas and it looks like they're >> the CELLMAX-EXT-CPU which only cover 806–960 MHz and 1710–2200 MHz :( . >> Hey but on the plus side, they contain tee couplers that are rated for >> the >> full 698–960 MHz and 1710–2700 MHz. I've needed a 2.4Ghz coupler for a >> while now and that alone was worth the minimum bid for me. With one of >> those, a noise source and a spectrum analyzer, I can start characterizing >> Wifi/Bluetooth antennas. >> The antenna design is relatively simple and pretty cool looking. It would >> be interesting to try and simulate the design and see how much would have >> to change in order to extend the range. Also, if anyone wants to build a >> phase arrayed radar system... >> >> >> On Fri, Oct 28, 2016 at 6:57 PM, Marc Juul <juul(a)labitat.dk> wrote: >> >> Are you sure these cover 2.4 GHz. There are multiple versions of the >>> CELLMAX-EXT and e.g. the CELLMAX-EXT-CPU seems to not cover 2.4 GHz >>> while >>> the CELLMAX-EXT-CPUSE does cover 2.4 GHz: >>> >>> http://www.commscope.com/catalog/wireless/product_details.aspx?id=151 >>> >>> https://www.tessco.com/products/displayProductInfo.do?sku=396652 >>> >>> if we're sure they cover 2.4 GHz then we'd love to get them! I'd pay up >>> to $100 in that case >>> >>> On Fri, Oct 28, 2016 at 4:55 PM, Jake <jake(a)spaz.org> wrote: >>> >>> pallet of high gain (11dbi) directional wifi antenna's up for auction: >>>> https://www.auctionbdi.com/listings/details/index.cfm?itemnu >>>> m=1158888078 >>>> >>>> Fitz says they can probably be won for $25 and i think he's willing to >>>> bid on them for sudomesh >>>> >>>> so if sudomesh wants them, they should tell Fitz how much Sudomesh will >>>> pay for the lot. 140 pounds of antennas. >>>> >>>> Fitz, did you have a datasheet on these antennas? I believe i recall >>>> they were wideband in the 900MHz and 2.4GHz bands? >>>> >>>> >>>> -jake >>>> _______________________________________________ >>>> mesh mailing list >>>> mesh(a)lists.sudoroom.org >>>> https://sudoroom.org/lists/listinfo/mesh >>>> >>>> >>> >>> >> _______________________________________________ >> mesh mailing list >> mesh(a)lists.sudoroom.org >> https://sudoroom.org/lists/listinfo/mesh >> >> >>