Actually, the rings can be 24” away from the feed horn. In higher frequencies it becomes practical to just use a fresnel lens like a lighthouse uses. The lens is made out of plastic.
From: Steve Jones Sent: Tuesday, September 21, 2021 11:30 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] First 60Ghz LR alignment job ever Id give my left nut, or 6 chickens to have that for epmp 5ghz. But I assume link distance dictates some of the ring placement. I cant get wrench jockeys to tighten bolts, let alone do maths. I had tried shielding the bottom part of the reflector to see if I could do away with some ground reflected multipath. In retrospect I wonder if it reflects off the top of the dish not the bottom when the reflection comes from the ground On Wed, Sep 15, 2021 at 4:42 PM Chuck McCown via AF <af@af.afmug.com> wrote: Zone plate antenna I have tried to make these things work and did not have good luck. I think one of my sons also tried in college and he had lousy luck too. From: Chuck McCown via AF Sent: Wednesday, September 15, 2021 3:35 PM To: 'AnimalFarm Microwave Users Group' Cc: Chuck McCown Subject: Re: [AFMUG] First 60Ghz LR alignment job ever If you can surgically block everything below .6 (I think it is .6 might be 1) you can get 6 dB more signal than free space path loss. That is the principle of zone plate antennas. I agree, if you are seeing the second, you need to lower or keep going higher to get all of the third or you are losing ground. From: Brian Webster Sent: Wednesday, September 15, 2021 3:25 PM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] First 60Ghz LR alignment job ever You may actually want to lower the unit. The higher you go the more even number Fresnel zones you expose which are out of phase for the odd numbered ones. This will actually lower signal. Higher is not always better. Best practice is to try to achieve between .6 and 1 Fresnel zone clearance. Going higher exposes the second zone and starts you losing signal strength. Thank you, Brian Webster www.wirelessmapping.com From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Jaime Solorza Sent: Wednesday, September 15, 2021 5:11 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] First 60Ghz LR alignment job ever Will let you know... On Wed, Sep 15, 2021, 3:01 PM Chuck McCown via AF <af@af.afmug.com> wrote: 9’ fresnel zone at the mid point of a 4 mile path. I will be surprised if this helps. From: Jaime Solorza Sent: Wednesday, September 15, 2021 2:54 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] First 60Ghz LR alignment job ever They raised tower and tighten guyed wires...they are going to move It higher. On Wed, Sep 15, 2021, 11:55 AM Mathew Howard <mhoward...@gmail.com> wrote: I doubt they'd even connect if you weren't clearing the tree line (the fresnel zone is tiny at 60ghz, so that's not usually an issue, as long as you have visual LOS). I don't think I've ever been able to hit the expected signal on a 3+ mile link with those radios, so I wouldn't be surprised if you don't get much more than that out of it. On Tue, Sep 14, 2021 at 7:04 PM Jaime Solorza <losguyswirel...@gmail.com> wrote: Little over 4 miles but i think they are not high enough to completely over tree line. On Tue, Sep 14, 2021, 5:53 PM Chuck McCown via AF <af@af.afmug.com> wrote: How long is the path? Sent from my iPhone > On Sep 14, 2021, at 5:46 PM, Jaime Solorza <losguyswirel...@gmail.com> wrote: > > > We got it to -54dBm of expected -46dBm and was passing 380 -406Mbps...the other side of link is one with problems...every time Moye shifted weight on tower , signal would degrade...i think they said guyed wires need adjustments....more to come.. > <IMG_20210914_105355.jpg> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com ---------------------------------------------------------------------------- -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com ------------------------------------------------------------------------------ -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com ------------------------------------------------------------------------------ -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
-- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
