You might want to look into ETSI class 4 antennas. The Commscope Sentinel line is a good example. Pricey, and long lead time for shipment. But we're talking about antennas with 70 dB f/b ratio and specially engineered side shroud material for smaller side lobes/radiation pattern envelope.
They are not common in the US yet due to lax FCC regulations (as compared to Europe, Canada) but you can get them. On Mon, Nov 7, 2016 at 5:39 PM, George Skorup <[email protected]> wrote: > My finger clicked send before my brain. > > Interestingly, a RadioWaves HP2-11 has 60dB f/b ratio and is a Cat B. > While a HP3-11 has 62dB f/b and is Cat A. The VHLP800-11 has 59dB f/b and > is Cat A while being only 3" smaller in actual diameter vs the HP3-11 > (35.5" for a "2.5" foot antenna, vs a 38.4" 3 foot). But a bit weaker f/b > ratio than a HP2. Both are shrouded. I don't get it. I think there may be > something else like main lobe beamwidth, too. > > The problem with all this Cat A vs B stuff is it really doesn't matter > anymore in congested areas. I had Liz look for a 56MHz channel on a path. > She said nope. I said, OK, what about changing the 2' end to a 3'. She > still said nope. Polarity, antenna size, etc., nothing mattered. Out of > channels is out of channels. Good luck with those funky B11's. > > On 11/7/2016 7:09 PM, Mike Hammett wrote: > > Yes. Not a size requirement, just a suppression requirement. It's just > what size of antennas normally meet those requirements. > > > > ----- > Mike Hammett > Intelligent Computing Solutions <http://www.ics-il.com/> > <https://www.facebook.com/ICSIL> > <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> > <https://www.linkedin.com/company/intelligent-computing-solutions> > <https://twitter.com/ICSIL> > Midwest Internet Exchange <http://www.midwest-ix.com/> > <https://www.facebook.com/mdwestix> > <https://www.linkedin.com/company/midwest-internet-exchange> > <https://twitter.com/mdwestix> > The Brothers WISP <http://www.thebrotherswisp.com/> > <https://www.facebook.com/thebrotherswisp> > > > <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> > ------------------------------ > *From: *"George Skorup" <[email protected]> <[email protected]> > *To: *[email protected] > *Sent: *Monday, November 7, 2016 7:08:11 PM > *Subject: *Re: [AFMUG] Class A and B antennas > > IIRC, the classes are about front to back radio and sidelobe suppression. > > On 11/7/2016 6:45 PM, Mike Hammett wrote: > > 2.6' in 11 GHz. I forget who. > > > > ----- > Mike Hammett > Intelligent Computing Solutions <http://www.ics-il.com/> > <https://www.facebook.com/ICSIL> > <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> > <https://www.linkedin.com/company/intelligent-computing-solutions> > <https://twitter.com/ICSIL> > Midwest Internet Exchange <http://www.midwest-ix.com/> > <https://www.facebook.com/mdwestix> > <https://www.linkedin.com/company/midwest-internet-exchange> > <https://twitter.com/mdwestix> > The Brothers WISP <http://www.thebrotherswisp.com/> > <https://www.facebook.com/thebrotherswisp> > > > <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> > ------------------------------ > *From: *"SmarterBroadband" <[email protected]> > <[email protected]> > *To: *[email protected] > *Sent: *Monday, November 7, 2016 6:34:03 PM > *Subject: *[AFMUG] Class A and B antennas > > Does anyone make a 2 foot Class A antenna for 11 GHz? Or is 3 foot the > minimum. > > > > Does anyone make a 1 foot Class A antenna for 18 GHz? Or is 2 foot the > minimum. > > > > Is there a minimum distance for a 11 GHz link? > > > > Thanks > > > > Adam > > > > >
