Ken nailed it - all of this is Frequency Coordination / Efficient Spectrum Utilization 101 - there’s at least one “Coordinator” out there that could desperately use your help!
> On Nov 11, 2020, at 12:52 PM, Ken Hohhof <[email protected]> wrote: > > It also pays to plan out your HI and LOW side towers and which links will be > VPOL vs HPOL. If you're doing a ring all in the same band, it helps if > there's an even number of towers, so you can do something like > 1HI-2LOW-3HI-4LOW-backto1HI. Also I think freq coordinators will usually > prefer to do links in VPOL because of slightly less rain fade, so VPOL tends > to get used up. If you have an easy link maybe do it in HPOL and save VPOL. > Of course a dual pol link will use both. > > > -----Original Message----- > From: AF <[email protected]> On Behalf Of Ken Hohhof > Sent: Wednesday, November 11, 2020 7:11 AM > To: 'AnimalFarm Microwave Users Group' <[email protected]> > Subject: Re: [AFMUG] 11ghz etiquette > > What you are doing is totally mainstream, and I don't know why you call those > low cost radios. > > We have a lot of 6 mile 11 GHz links, I think we have one at 10 miles and one > at 16 miles on 3 ft dishes. Yes, if we try to coordinate links near Cyrus > One in Aurora, there are no frequencies, and we had to switch to 18 GHz for a > couple short links in the city of DeKalb. But under 2 miles should probably > be 18 GHz anyway. I occasionally see telco and power companies using 11 GHz > for 1 mile links and yes that's probably rude. And using 6 GHz under 10 > miles is probably rude, although they'll just require you to dial back your > xmt power. We haven't experienced the problems you describe out in the rural > areas, the worst I've run into is having to juggle things to keep all the > links in the same sub band to reduce the number of spares on the shelf. > > I think the worst you might run into is those 2 ft dishes are Category B and > if that prevents someone else from coordinating a link, they could force you > to upgrade to Cat A (3 ft). I haven't had that happen. > > I do have a few 11 GHz links with 2 ft at one end and 3 ft at the other. > This can sometimes get you the system margin you want if one end can't > support the larger antenna. (At one tower we got lucky and AT&T had > abandoned a 12 ft Andrew antenna that we could re-aim a few degrees and use.) > > > > -----Original Message----- > From: AF <[email protected]> On Behalf Of Matt Hoppes > Sent: Wednesday, November 11, 2020 6:25 AM > To: AnimalFarm Microwave Users Group <[email protected]> > Subject: Re: [AFMUG] 11ghz etiquette > > We are running 13 mile 11ghz links with the airfiber11 and not seeing fading > with the 2 ft dish. > > What’s your question? If there is no more spectrum there is no more > spectrum. > >> On Nov 11, 2020, at 2:42 AM, Steve Jones <[email protected]> wrote: >> >> >> We have been putting up a handful of 11ghz links lately and are running out >> of available channels in a relatively small footprint. We are limited to 5 >> to 8 miles because of antenna size limits. Grain legs wont support large >> than 3 foot antennas and many are to sketchy to go above 2 foot. Most of our >> rooftop locations wont support larger than 3 foot ballast/tray/equipment >> weight and none of our leases on rooftops allow anything other than nprm. >> Have we shot ourselves in the foot? Are 5 mile licensed links frowned upon? >> We are really digging the wtm4200 aviat (they're not SAF latency) but they >> meet our demand, price is right and support is good. But I'm wondering if >> low cost radios got us greedy and spectrum rude. >> -- >> AF mailing list >> [email protected] >> 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 > > > > -- > AF mailing list > [email protected] > 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 -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
