If there’s double the bandwidth or more in frequency separation between T-R at the bucking site you should be okay. It will just be difficult to add frequencies / new paths at that site in the future. Send me the path data and I’ll take a quick look.
On Fri, Mar 13, 2020 at 9:00 PM Ken Hohhof <af...@kwisp.com> wrote: > I realize we forced them into this situation by wanting new links > involving 2 sites where we already have 11 GHz. > > > > One of the sites is a water tank where it might be possible to put the > tank between the 2 dishes, but that is not the bucking site. That site is > actually I think a Rohn 45 and the antennas would be close to each other, > although not the same azimuth. > > > > It sounds like I should ask them to look at it again with one of the > shorter links in 18 GHz. > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Tim Hardy > *Sent:* Friday, March 13, 2020 7:38 PM > *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> > *Subject:* Re: [AFMUG] licensed link high/low question > > > > The radios certainly don’t have any isolation from this type of > interference, so what you’re relying on is totally on the antennas - > there’s not much FSL on these and I wouldn’t bet my life on a 2’ Category B > to provide the kind of close-coupling loss needed on a co-located system. > AT&T and MCI used to do it when they had completely back-to-back horns or > ultra-high performance antennas but they provide about 80 dB of > discrimination front-to-back. > > Sent from my iPad > > > > On Mar 13, 2020, at 8:31 PM, Colin Stanners <cstann...@gmail.com> wrote: > > > > To my knowledge the radios and dishes have enough isolation that H/L match > at a site is not necessary unless you're almost pointing in the > same direction with those dishes (or have a TX frequency at one site > overlapping a RX) . The opposite polarity increases the isolation so you > have even less worry in this case. That H/L match idea is more of a > tendency and to simplify planning than a rule. > > On Fri, Mar 13, 2020, 6:52 PM Ken Hohhof, <af...@kwisp.com> wrote: > > I am having some 11 GHz links coordinated and the draft PCNs they sent me > have one site high on one link and low on the other link. They are however > different sub bands, and one is HPOL and the other is VPOL. Does this make > it OK? I could probably do one of the links in 18 GHz. > > > > I had internalized the idea that you never had high and low at the same > site. > > -- > 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 >
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