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 >> >> >>