A note of caution: Some vendors have been pushing the notion that at 11 GHz, one can coordinate and license an 80 MHz bandwidth pair along with a 40 MHz bandwidth pair separated by 60 MHz to in effect get a contiguous 120 MHz of spectrum. This is okay as long as you are transmitting two distinct frequency pairs - one with 80 MHz, and the other with 40 MHz. In the US it is NOT okay to unlock the radio to use ETSI 112 MHz bandwidth and transmit a single pair. Vendors that are pushing this concept need to stop as it violates at least two and possibly more FCC Rules. The licensee would be taking the risk - not the vendor.
> On Jan 4, 2021, at 3:54 PM, <[email protected]> > <[email protected]> wrote: > > With the SIAE radio: > - 2+0 XPIC - minimal loss using the built-in OMT branching unit on the > order of 0.5 dB per end > - 2+0 ACCP - 3.5 dB loss per end using the built-in Hybrid branching unit > No TX power back-off required in either mode, nor do you need to back-off the > TX power when using POE. > > The ALFOPlus2XG radio has independent modem & RF, so there is flexibility on > how you could setup each radio. Each carrier can have its own channel > bandwidth & modulation. > > The branching units are field changeable and allow the ODU to bolt directly > to the back of the antenna. > > > Thanks, > > <Mail Attachment.jpeg> > > Joe Schraml > VP Sales Operations & Marketing > SIAE Microelettronica, Inc. > +1 (408) 832-4884 > [email protected] <mailto:[email protected]> > www.siaemic.com <http://www.siaemic.com/> > > >>> Mathew Howard <[email protected] <mailto:[email protected]>> > >>> 1/4/2021 12:01 PM >>> > Yeah, you can do 2 x 80mhz channels with a single core on some radios, but > there are some limitations. Depending on the radio, my understanding is that > they have to either be adjacent, or very near each other (definitely within > the same sub-band). It seems to me that some radios can even do two different > sizes of channels (like 1 80mhz + 1 40mhz), but I could be remembering that > wrong. If I understand it right, the Aviat radios have a significant tx power > hit when you activate that feature, which probably makes it unusable in a lot > of cases. We're doing that on a Bridgewave 11ghz link (using 4x 80mhz on a > dual core radio), and there's it works fine, with only a minor performance > hit on those radios. SIAE does have that feature as well, but I don't > remember if there was a significant performance hit or not... I think they > may have been the ones that could use two different sizes of channels. > > On Mon, Jan 4, 2021 at 1:51 PM Ken Hohhof <[email protected] > <mailto:[email protected]>> wrote: > Probably, LinkPlanner is pretty smart. > I assume you don't want to use 2 antennas. > There are some licensed radios now that I think can do 2 x 80 MHz channels in > a single core, like from Aviat or SIAE maybe, I don't know if this gets > around the splitter cost and performance issues. I may have that feature > completely wrong, I haven't looked into it. There could also be a performance > hit by using the same xmt power amp for 160 MHz. > I also haven't checked out the full feature set of the new PTP850C, the only > thing I know it has is SFP+. > > ---- Original Message ---- > From: "Adam Moffett" <[email protected] <mailto:[email protected]>> > Sent: 1/4/2021 1:30:45 PM > To: [email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] 2+0 Co-Polar > > Ok yeah, the Link Planner BOM shows some splitters. I wonder if Link > Planner already accounted for the additional losses when I selected "Co > Polar" on the dropdown. > > > On 1/4/2021 2:25 PM, Ken Hohhof wrote: > > I seem to remember that different channel different polarization is the > > best, if your radio manufacturer charges for an XPIC license key. Next best > > is XPIC. And that the problem with different channel same polarization is > > you need a splitter which costs several dB of system gain. But that's from > > memory, and mine is not so reliable. > > > > ---- Original Message ---- > > From: "Adam Moffett" <[email protected] <mailto:[email protected]>> > > Sent: 1/4/2021 1:16:26 PM > > To: "AnimalFarm Microwave Users Group" <[email protected] > > <mailto:[email protected]>> > > Subject: [AFMUG] 2+0 Co-Polar > > > > I'm looking at a path where the coordinator can get me two 50mhz XPIC > > channels, or two 80mhz H-Pol channels. > > > > I've never installed co-polar. Do you need a lot of extra junk to make > > that work? > > > > > > > > -- > 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] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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