Right, and so do the people you're talking about - keep it in mind they've already tested these.
I brought up this exact issue by the way, when they (idiot customer) fuck up a connector and buy one from BillyBobs HAM shop and wonder why it doesn't work. I was told the cost on these was low, and they would be sold like any other connector or accessory. I mean, you DO buy spares for licensed backhaul, right? I was also told they are working on "other accessories" for this radio that will be some of the highest quality in the industry. On Jul 1, 2016 9:27 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: > Here is the thing, you buy a radio that has 11 or 18 GHz appearing on an > N connector. > > Then you purchase a cable from your favorite cable place. Connect the two > and wonder why you are having problems. > > If you get a cable that actually has connectors rated for the frequency > if they did not sweep it, there is no guarantee it will work properly. > And if they did sweep it it is going to cost a ton. > > SMA is cheap, easy and always works at those frequencies. N is only cheap > and easy below 6 GHz. > I am not saying a connector that is rated for the frequency will not do > the job, but the connector is just the first step. If you do not use > extreme precision at 18 GHz then sweep the cable with the proper gear it is > going to have problems. Things like terminations at 18 GHz are not even > trivial. It is so hard to get a good 50 ohm termination for calibration > you generally use a sliding load. (Actually, you are normally using > waveguide at 18 GHz. ) > > I do – do this for a living, you know... > > *From:* Josh Reynolds <j...@kyneticwifi.com> > *Sent:* Friday, July 01, 2016 8:13 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N > > > I'm saying the same thing. Take the connector designed for it, thrown your > opinion in the trash, and post the results. Repeat the test. Have someone > else repeat the test. Scientific method. > On Jul 1, 2016 9:10 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: > >> Type N connectors are not in common use above 6 GHz. Believe me or not. >> >> You wanna go above 6, there are plenty of other cheaper and better >> connectors to use. N connector concentricity is not inherent to the design >> of the connector. And concentricity is essential to good return loss. >> >> You send me an N connector cable. I will put it on a load and connect it >> to a vector network analyzer with a smith chart on the screen. Will >> record video. Then I will wiggle the cable and back off the connector a >> bit you can see for yourself the dot (arc actually) wander all over the >> place. The higher the frequency the more it becomes a wild line. >> >> Then I will do the same for SMA and you can see for yourself which one is >> more stable. Opinions don’t matter. A dot is a dot, an arc is an arc and >> a squiggly line is a squiggly line. >> >> *From:* Josh Reynolds <j...@kyneticwifi.com> >> *Sent:* Friday, July 01, 2016 7:53 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N >> >> >> So, nothing personal by this... but if the connector is designed for it >> (and has several versions by other manufacturers to boot), has been used >> (and is still used) on testing equipment... I'm probably more inclined to >> take their word for it over yours. >> On Jul 1, 2016 7:58 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: >> >>> IMHO, 6 GHz is the upper limit. >>> >>> *From:* Peter Kranz <pkr...@unwiredltd.com> >>> *Sent:* Friday, July 01, 2016 5:22 PM >>> *To:* af@afmug.com >>> *Subject:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N >>> >>> >>> “Originally, the connector was designed to carry signals at frequencies >>> up to 1 GHz <https://en.wikipedia.org/wiki/GHz> in military >>> applications, but today's common Type N easily handles frequencies up to 11 >>> GHz. More recent precision enhancements to the design by Julius Botka at >>> Hewlett >>> Packard <https://en.wikipedia.org/wiki/Hewlett_Packard> have pushed >>> this to 18 GHz.” >>> >>> >>> >>> http://inmet.apitech.com/inmet/micro-inmet-between-typen.cfm >>> >>> >>> >>> >>> *Peter Kranz*www.UnwiredLtd.com <http://www.unwiredltd.com/> >>> Desk: 510-868-1614 x100 >>> Mobile: 510-207-0000 >>> pkr...@unwiredltd.com >>> >>> >>> >>> *From:* Af [mailto:af-boun...@afmug.com] *On Behalf Of *Chuck McCown >>> *Sent:* Thursday, June 30, 2016 3:24 PM >>> *To:* af@afmug.com >>> *Subject:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N >>> >>> >>> >>> Yeah, I think this is a case of somebody bowing their neck - a pissing >>> contest between a boss and underlings at UBNT. >>> >>> >>> >>> *From:* Eric Kuhnke <eric.kuh...@gmail.com> >>> >>> *Sent:* Thursday, June 30, 2016 4:19 PM >>> >>> *To:* af@afmug.com >>> >>> *Subject:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N >>> >>> >>> >>> I have never in my life personally seen an N connector rated above 11 >>> GHz. High-quality/expensive N connectors are used extensively in two way >>> satellite - such as with 3.0 meter C-band Tx/Rx earth station dishes... >>> But you only use N for the 50 ohm coax cables from the modem (indoors) to >>> the electronics which lives directly attached to the waveguide/feed on the >>> dish (Rx LNB and Tx SSPA/BUC). >>> >>> The coax is used between 1.2 to 1.8 GHz to communicate with the Tx and >>> Rx electronics on the dish. A satellite LNB on the Rx side is basically a >>> 10:1 ratio downconverter. >>> >>> Like so: >>> http://beta.satcomresources.com/sca/images/NORS3120N_detail-3.jpg >>> >>> There's your single polarity waveguide interface on one side, N on the >>> other. >>> >>> >>> >>> On Thu, Jun 30, 2016 at 6:49 AM, Chuck McCown <ch...@wbmfg.com> wrote: >>> >>> First of all, I have never seen an N connector rated above 11 GHz, and >>> those are extra expensive. >>> >>> If there is an 18 GHz version, it will be even more expensive. >>> >>> >>> >>> This will not be a cable you can make yourself in the field and it will >>> be very sensitive to being fully seated so you will probably have to use a >>> torque wrench to make it work at 18 GHz. >>> >>> >>> >>> Silly. You can weatherproof an SMA just as easy as an N connector. >>> Good heatshrink can be found for both. >>> >>> Folks trying to use N connectors at 18 GHz are going to quickly get >>> introduced to the world of return loss problems. >>> >>> >>> >>> >>> >>> >>> >>> *Von:* Af [mailto:af-boun...@afmug.com] *Im Auftrag von *Rob Genovesi >>> *Gesendet:* Donnerstag, 30. Juni 2016 01:32 >>> *An:* af@afmug.com >>> *Betreff:* Re: [AFMUG] Convert Andrew Dragonwave dishes to N >>> >>> >>> >>> From Gary-UBNT: >>> >>> "We are working on data sheets right now so hopefully you will get more >>> questions answered shortly. The reason for N connectors relates to demand >>> for higher mechanical robustness and the ability for the connectors to be >>> weather-proof as a stand alone connector (fully weatherproof gaskets and >>> the ability to accept larger diameter jumpers readily). The N connectors >>> we use are rated to 18+ GHz." >>> >>> An active thread on the UBNT forums right now, more available here: >>> http://community.ubnt.com/t5/airFiber/Some-AF11X-details/td-p/1512145 >>> >>> -Rob >>> >>> >>> >>> On Wed, Jun 29, 2016 at 12:05 PM, Bill Prince <part15...@gmail.com> >>> wrote: >>> >>> I'm looking at all the other AF-nnX radios from UBNT, and they all use >>> SMA connectors. What reason would they have to use N instead of SMA? Seems >>> the SMA connector would have fewer issues at 11 GHz. >>> >>> >>> >>> >>> >>
