Ken - exactly, I forgot about OFDM.. Sent from my iPad
> On Feb 26, 2019, at 6:23 PM, Ken Hohhof <af...@kwisp.com> wrote: > > If you’re referring to AF11, isn’t that an OFDM platform? Which is an > unusual choice for a licensed radio, most are single carrier QAM. OFDM lets > you implement with a DSP approach and naturally gives you a power spectral > density plot that looks like “Bart’s head”. It naturally yields a certain > amount of out-of-band filtering, probably saving money. But then to meet a > rigorous OOB emissions template, now you need additional analog filtering > which eats into the cost savings. Especially at 11 GHz where I assume you > aren’t just throwing in a few inductors and capacitors to create a brick wall > filter. > > > From: AF <af-boun...@af.afmug.com> On Behalf Of Tim Hardy > Sent: Tuesday, February 26, 2019 4:23 PM > To: AnimalFarm Microwave Users Group <af@af.afmug.com> > Subject: Re: [AFMUG] Higher power 18Ghz radios.. > > Sloppy filters. > > Sent from my iPad > > On Feb 26, 2019, at 5:18 PM, Mathew Howard <mhoward...@gmail.com> wrote: > > Well, I'm just guessing, but what other reason would there be for occupying > 79mhz with a 56mhz radio? > > On Tue, Feb 26, 2019 at 4:08 PM Tim Hardy <thardy...@gmail.com> wrote: > If that’s the case, it must’ve been truly horrid at 56 MHz. There are > consequences in this wasting of spectrum - you’ll notice that modulations > less than 16 QAM are not currently coordinated or licensed since they fail to > meet the FCC’s minimum of 1 bit/Hz. Any operation of the AF-11 at QPSK or > 1/4 QPSK is not actually legal.. > > Sent from my iPad > > On Feb 26, 2019, at 4:34 PM, Mathew Howard <mhoward...@gmail.com> wrote: > > Yeah, but my point is that they made a really noisy 56mhz radio work by just > occupying a full 80mhz channel... at least that's the way I understand it. It > seems like they're kind of doing the same thing here. > > On Tue, Feb 26, 2019 at 3:24 PM Tim Hardy <thardy...@gmail.com> wrote: > While the AF-11 used a 56 MHz chipset, the radio occupies 79.6 MHz - unlike > all other radios with these chips that limit their bw to 56 MHz (this used to > be the ETSI maximum). The AF-11 system gain is horrible for 1024 QAM when > compared to other outdoor radios - either full 60 MHz or full 80 MHz bw. > > Sent from my iPad > > On Feb 26, 2019, at 3:26 PM, Mathew Howard <mhoward...@gmail.com> wrote: > > Interesting, so I'm guessing that they're able to reduce the noise to an > acceptable level at that high of power by using a narrower channel... kind of > like what Ubiquiti did with the AirFiber 11. > > On Tue, Feb 26, 2019 at 1:54 PM Tim Hardy <thardy...@gmail.com> wrote: > > Just an FYI.. > According to this chart, the occupied bandwidth is only 64.5 MHz so you will > be losing capacity vs radios that occupy the full 80 MHz bandwidth. The DW > radio will have to be coordinated and licensed in one of the 80 MHz channel > allocations as there are no FCC channel plans between 51 MHz and 79 MHz. > There are only 4-channel pairs available at 80 MHz and its difficult to > coordinate multiple pairs in many areas as a result. Finally, while these > power levels are impressive, they don't tell the full story and you really > need to compare the system gain values at the desired modulations. The DW > 64.5 MHz radio’s system gain at 2048 QAM is 83 dB vs. the WTM 4100 80 MHz > radio’s system gain at 2048 QAM which will be 73.5 dB. > > > On Feb 26, 2019, at 12:19 PM, Peter Kranz <pkr...@unwiredltd.com> wrote: > > +31 is the advertised 2048QAM output on the HP variant. Dragonwave contacted > me offline and is indicating a March availability. Here is the table of power > output levels for that radio. It should also support 4096QAM, but I’m not > sure if that’s available in the software yet. > > <image001.png> > > Peter Kranz > www.UnwiredLtd.com > Desk: 510-868-1614 x100 > Mobile: 510-207-0000 > pkr...@unwiredltd.com > > From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof > Sent: Monday, February 25, 2019 8:27 PM > To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> > Subject: Re: [AFMUG] Higher power 18Ghz radios.. > > Looks like PTP820c is only +16. > > You’re talking about xmt power actually at 2048QAM modulation, right? +31 is > hard to believe. > > I remember hearing that Broadcom was supposed to have a chip with adaptive > digital predistortion for high xmt power also 4096QAM not sure if that became > real. > > From: AF <af-boun...@af.afmug.com> On Behalf Of Peter Kranz > Sent: Monday, February 25, 2019 6:51 PM > To: af@af.afmug.com > Subject: [AFMUG] Higher power 18Ghz radios.. > > Dragonwave announced over a year ago the Harmony Enhanced 18HP, with +31 TX > power at 2048 QAM, but have never made it to production as far as I know. > From the top of my head, here are some of the major radios TX power in 18 Ghz > band: > > Dragonwave Harmony Enahcend HP – 31 <Vaporware?> > Dragonwave Harmony Enhanced SP – 22 > Bridgewave Navigator – 19 > Aviat WTM 4200 – 17.5 > SIAE AlfoPlus2 – 17 > > Curious if anyone is aware of an 18Ghz dual core radio capable of higher TX > power at 2048QAM? It’s quite difficult to license 6Ghz or 11Ghz paths in my > market. > > Peter Kranz > www.UnwiredLtd.com > Desk: 510-868-1614 x100 > Mobile: 510-207-0000 > pkr...@unwiredltd.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
