No obvious way to crack one open and I don’t have any dead ones yet - but spring is coming. Should not be too long before Thor comes to visit.
Mark > On Mar 28, 2019, at 3:26 PM, Ken Hohhof <[email protected]> wrote: > > I’m busy configuring a licensed link or I’d snap a photo. But here’s a > Cambium video of assembling a 450b high gain, maybe you can glean enough from > this. Note that there is an optional radome that snaps onto the front of the > dish, they don’t show it in the video, but some of us like the radomes for > aesthetics/windload/snow. > > https://www.youtube.com/watch?v=z88P-0nZkZ8&feature=youtu.be > <https://www.youtube.com/watch?v=z88P-0nZkZ8&feature=youtu.be> > > > From: AF <[email protected] <mailto:[email protected]>> On Behalf > Of [email protected] <mailto:[email protected]> > Sent: Thursday, March 28, 2019 1:54 PM > To: 'AnimalFarm Microwave Users Group' <[email protected] > <mailto:[email protected]>> > Subject: Re: [AFMUG] [*] Re: [*] corrective optics > > Yes, I could probably google it, but I would like to have an image of the SM > and reflector or whatever that is underperforming. > > From: Ken Hohhof > Sent: Thursday, March 28, 2019 12:17 PM > To: 'AnimalFarm Microwave Users Group' > Subject: Re: [AFMUG] [*] Re: [*] corrective optics > > I think he meant a photo of a Cambium 450b, or something relevant to > improving the antenna performance thereof. > > What were you thinking the topic was about? > > > From: AF <[email protected] <mailto:[email protected]>> On Behalf > Of Carl Peterson > Sent: Thursday, March 28, 2019 1:05 PM > To: AnimalFarm Microwave Users Group <[email protected] > <mailto:[email protected]>> > Subject: Re: [AFMUG] [*] Re: [*] corrective optics > > "What would you like to see?" > > I'm OK with the spam, but if this thread goes the wrong way I might need to > unsubscribe. No offense, just not my bag. > > On Thu, Mar 28, 2019 at 11:06 AM Mark Radabaugh <[email protected] > <mailto:[email protected]>> wrote: >> What would you like to see? >> >> Mark >> >> On Mar 28, 2019, at 10:26 AM, Chuck McCown <[email protected] >> <mailto:[email protected]>> wrote: >> >>> How about some photos. >>> >>> Sent from my iPhone >>> >>> On Mar 28, 2019, at 6:58 AM, Ken Hohhof <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>>> If you ever do the experiment again, it would be interesting to rotate the >>>> antenna to see if there’s some kind of sidelobe pointed toward the ground >>>> or something. Obviously you can’t install it rotated or upside down >>>> (unless you really trust that cable gland to seal against rain), but it >>>> would be interesting to see the results. Like you said, maybe some >>>> component in the feed horn is blocking the RF. >>>> >>>> Cambium is in a better position to investigate this, it’s disappointing if >>>> they aren’t taking it seriously. >>>> >>>> >>>> From: AF <[email protected] <mailto:[email protected]>> On >>>> Behalf Of Mark Radabaugh >>>> Sent: Thursday, March 28, 2019 6:19 AM >>>> To: AnimalFarm Microwave Users Group <[email protected] >>>> <mailto:[email protected]>> >>>> Subject: Re: [AFMUG] [*] corrective optics >>>> >>>> >>>> >>>> >>>>> On Mar 27, 2019, at 10:11 PM, Ken Hohhof <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> In another thread, Mark Radabaugh posted: >>>>> >>>>> “For your next product…. Corrective optics for 450B high gain CPE!” >>>>> >>>>> Mark, I’m not sure if you were serious, I suspect yes. >>>> >>>> >>>> Yes - but I’m not sure what is possible with the design. >>>> >>>> >>>>> >>>>> I know it’s frustrating that the antenna gain is lower than the old >>>>> reflector dish, Cambium dropped the number on the spec sheet to 24 dBi, >>>>> but I think even that is optimistic, I think it’s about 2 dB less than >>>>> the old combo which was supposed to be 25 dBi. Lower antenna gain is >>>>> going the wrong way! I don’t care if it does have higher xmt power, that >>>>> does nothing for the downstream direction. >>>> >>>> >>>> Changing the spec sheet to match what they ended up with was a pretty big >>>> cop out when the product failed to meet design expectations. >>>> >>>> >>>>> >>>>> In calling for corrective optics, do you have any info or even a gut feel >>>>> for whether the problem is in the feed or the dish? Is it as simple as >>>>> the dish is just too small? >>>> >>>> >>>> I suspect that they managed to block part of the antenna feed horn with >>>> other components. >>>> >>>> >>>> >>>>> >>>>> Also, is it just the gain is low, or does the 450b hi gain have other >>>>> issues? Like poor F/B or sidelobe performance or something? >>>> >>>> It seems like if the 450b high gain is far away from other surfaces it >>>> works mostly to spec but when mounted in the typical locations near >>>> rooftops it seems like it either picks up more destructive multipath >>>> interference than previous designs or the antenna pattern distorts badly. >>>> For a long time I thought they didn’t manage to get the feedhorn in the >>>> focus of the dish but Cambium assures me that it’s right. We are seeing >>>> decent performance under 5 miles but it seems to fall apart much quicker >>>> over 5 miles than would be expected. >>>> >>>> We set up a test with the bucket truck and drove it out and measured every >>>> mile to 10 and it came back fine - but that was 50’ in the air with >>>> nothing around. Yet swapping out standard 450 SM’s with beehive or KP >>>> dishes with 450B’s at >5 miles routinely fails with poor signal. The >>>> difference is often far more than the 2dB the spec sheets would indicate. >>>> Sometimes it works if the antenna is well away from all other surfaces >>>> like on a tower but for the majority of installs the swap fails. Why >>>> were we doing that anyway? We wanted to start using 5.1/5.2. >>>> >>>> >>>>> >>>>> I know the 450b mid-gain is frustrating because apparently Cambium >>>>> doesn’t think a tight vertical pattern is important. I keep wondering if >>>>> a top and bottom flap like on the old 2.4 Stingers would correct that. >>>>> >>>>> Cambium seems to be sharing antenna designs between ePMP and 450, so the >>>>> same issues probably exist in the corresponding ePMP products. >>>>> -- >>>>> AF mailing list >>>>> [email protected] <mailto:[email protected]> >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> >>>> >>>> -- >>>> AF mailing list >>>> [email protected] <mailto:[email protected]> >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com>-- >>> AF mailing list >>> [email protected] <mailto:[email protected]> >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> >> -- >> AF mailing list >> [email protected] <mailto:[email protected]> >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > > > -- > Carl Peterson > PORT NETWORKS > 401 E Pratt St, Ste 2553 > Baltimore, MD 21202 > (410) 637-3707 > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com>-- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com>
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