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
