The other nice thing about using 3' and 4' size antennas on short paths like that, you get a narrower beam width and better f/b ratio, making it more likely you can coordinate the link successfully.
Avoiding the field strength Rx do not exceed values at other sites which are off-azimuth and behind your sites by 10 to 15 degrees. I recently did exactly the same thing with an Exalt ExtremeAir 18 link in Seattle. It runs at -37 with a 2' on one end and a 3' high performance on the other. On Wed, Oct 29, 2014 at 5:49 AM, Caleb Knauer via Af <[email protected]> wrote: > I don't have the calcs handy atm but it was calculated 5x9 at 2048QAM. > Short link though, 3.5 miles with 3'/4' dishes, RSL low 30's. Quite > aware of how quick 2048 will drop down, and 80mhz channels would have > given more wiggle room to drop rates and still maintain 1Gbps but > there was a time crunch for the project and the 60mhz heads were in > stock. Even at 256QAM the throughput is adequate *for this particular > application* if the fade is worse than calcs. > > On Tue, Oct 28, 2014 at 6:22 PM, Eric Kuhnke via Af <[email protected]> wrote: > > yeah, 2048QAM, but what is your fade margin from the threshold required > to > > run at 2048QAM vs. when it will step down to 256QAM and no longer be a 1 > > Gbps radio? > > > > If I recall right an IP20C requires an RSSI of something like -57.5 to > > operate at 2048QAM and will become a 256QAM radio at -63 or thereabouts. > Not > > much fade margin. Not something you can reliably predict as a five nines > > true 1Gbps link pretending to be a fiber patch cable between two routers. > > > > Unless you're running it at sub-4km distances with 60cm size antennas and > > the normal RSL is -35.0.... > > > > > > > > On Tue, Oct 28, 2014 at 5:40 AM, Caleb Knauer via Af <[email protected]> > wrote: > >> > >> We just put up a Ceragon IP20c link last week, 3.5 miles, one 60Mhz > >> frequency pair, 1030Mbps full duplex using 2048QAM, uses two cores > >> (same frequency) in a single FODU chasis and a combiner on the > >> antenna. Looks like any other single FODU install, very clean. Not > >> inexpensive however. > >> > >> On Tue, Oct 28, 2014 at 7:02 AM, Matt Jenkins via Af <[email protected]> > wrote: > >> > Cambium PTP820c > >> > Exalt ExtremeAir > >> > > >> > Both will give you 1gig in a single radio. > >> > > >> > Matthew Jenkins > >> > SmarterBroadband > >> > [email protected] > >> > 530.272.4000 > >> > > >> > On 10/27/2014 03:25 PM, Peter Kranz via Af wrote: > >> >> > >> >> > >> >> Has anyone shopped full Gig licensed links lately, which is the best > >> >> bargain? > >> >> > >> >> *Peter Kranz > >> >> *Founder/CEO - Unwired Ltd > >> >> www.UnwiredLtd.com <http://www.unwiredltd.com/> > >> >> Desk: 510-868-1614 x100 > >> >> Mobile: 510-207-0000 > >> >> [email protected] <mailto:[email protected]> > >> >> > >> > > > > > >
