Trango's initial 24 GHz radio could do that.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Mathew Howard" <mhoward...@gmail.com> To: "af" <af@afmug.com> Sent: Saturday, January 20, 2018 12:04:15 PM Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 This is the first I've heard of adaptive channel sizes... I've been looking at both Siklu and Bridgewater, and nobody from either company ever mentioned that (that doesn't necessarily mean they can't do it though). On Jan 20, 2018 11:58 AM, "Mike Hammett" < af...@ics-il.net > wrote: Adaptive channel sizes? ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP From: "Eric Kuhnke" < eric.kuh...@gmail.com > To: af@afmug.com Sent: Saturday, January 20, 2018 11:48:24 AM Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 This is not extremely new in 80 GHz, just with different and denser modulations. The Siklu 80 GHz stuff has done adaptive coding and modulation for a while. The (now 7 year old!) Bridgewave adaptrate 80 GHz stuff would maintain a 100 Mbps link during a rain fade, by switching a nominally QPSK-modulated 1500 MHz wide channel for 1 Gbps, temporarily down to BPSK during a rain fade event. On Sat, Jan 20, 2018 at 9:45 AM, Stefan Englhardt < s...@genias.net > wrote: <blockquote> Some vendors do some new things to stretch the range of 80GHz: http://de.nec.com/de_DE/global/prod/nw/pasolink/products/ipasolinkEX_advanced.html ? They modulate down and then reduce channel size. This gear is in the 20kEuro Range … Von: Af [mailto: af-boun...@afmug.com ] Im Auftrag von Faisal Imtiaz Gesendet: Samstag, 20. Januar 2018 17:08 An: af@afmug.com Betreff: Re: [AFMUG] Quick comparison between 80GHz and AF24 We have two things to contend with... one is Oxygen Absorption second is Rain Fade Science says, 24ghz has much less O2 absorption fade vs 80ghz Science also says that 24ghz has slightly less Rain fade vs 80ghz Science also says that if on a particular link, if one is comparing 24ghz vs 80ghz, the difference in which link drops first will be based on the TX power / Antenna Gain and Rx sensitivity. If all things were exactly the same, then 80ghz would drop before 24ghz in Rain event. But in reality, all things are not the same.. I believe 80ghz one is allowed more power, and higher antenna gain. https://www.e-band.com/index.php?id=86 https://www.linkedin.com/pulse/dont-fall-siklu-overbuilds-distance-claims-david-theodore at 3.5miles, one is pushing the limits of both 24gzh as well as 80ghz.. Depending on what you are trying to achieve, and the rainzone, you can make your choice based on what will perform better normally... cause both of them will go out in rain :) Best of Luck Faisal Imtiaz Snappy Internet & Telecom http://www.snappytelecom.net Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net <blockquote> From: "Mathew Howard" < mhoward...@gmail.com > To: "af" < af@afmug.com > Sent: Friday, January 19, 2018 8:42:31 PM Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 <blockquote> I'd guess 24ghz would be slightly better, but either one is going to drop at that distance if you ever get heavy rain. Somebody from Siklu told me at one time, that some of their customers have told then that their rainfade is slightly better than an AF24, but slightly worse than an AF24HD... how accurate that is, I don't know. On Jan 19, 2018 6:03 PM, "Rory Conaway" < r...@triadwireless.net > wrote: <blockquote> I haven’t run the numbers so please save me some time. Which one has less fade margin at 3.5 miles? I was going to use Siklu with a 2’ antenna. Rory Conaway • Triad Wireless • CEO 4226 S. 37 th Street • Phoenix • AZ 85040 602-426-0542 r...@triadwireless.net www.triadwireless.net “"Engineers believe that if it ain't broke, it doesn't have enough features yet." — Scott Adams </blockquote> </blockquote> </blockquote> </blockquote>
