It’s currently 2 single pol Horizons on a Dragonwave OMT mount that combines the H&V to the round waveguide on the back of the antenna.
Mark Radabaugh Amplex 22690 Pemberville Rd Luckey, OH 43443 419-261-5996 > On Mar 6, 2020, at 11:19 AM, Ken Hohhof <af...@kwisp.com> wrote: > > > We put 11 GHz 820C w/XPIC on existing Trango 3 ft dishes replacing single pol > ApexPlus ODUs and everything went as expected. I’d have to look up the > details but I think it worked because Trango used Remec circular even with > single pol except for 6 GHz. We should have adjusted for best XPIC > cancellation but instead we just made sure the ODUs were plumb. But I think > what we did was roughly the same as what you’re doing, so it should work. > > We got a couple bad 820S radios last year, failed the RF loopback test, but > it sounds like you have pretty thoroughly verified it’s not bad radios. > > Were the Dragonwaves single or dual pol? > > > From: AF <af-boun...@af.afmug.com> On Behalf Of Mark Radabaugh > Sent: Friday, March 6, 2020 9:37 AM > To: AnimalFarm Microwave Users Group <af@af.afmug.com> > Subject: [AFMUG] PTP Microwave antenna question > > > We have installed a lot of Cambium 820C radios without much trouble. Yes, > the configuration takes some getting used to but we probably have 46 links > working and installed, so it’s not like it’s our first rodeo configuring > these things. > > And then we tried something new - reusing a 4’ Andrew Dragonwave antenna in > a XPIC configuration. We purchased the Cambium adapter plate that clips > onto the antenna radio mount and presents the 820C mount for the OMT. Take > off the dual Horizon radio OMT, add the 820C and the RF signal is shit - in > the -80’s from the mid 40’s. Reverse the process and put the Horizon’s back > on and the signal is fine. > > So we thought we had a bad 820C. It’s happened before. So we take two > different sets of 820C’s and test them one at a time swapping them in for > known good installed radios on working links. The 820C’s are fine. > > Okay… we forgot to test the OMT's when we did that. So we try the OMT’s in > the shop - and they work fine. > > At this point the only thing left is the antennas themselves and the adapter > plate. The adapter plate is nothing more than a hole in a aluminum bushing > with a couple of small steps to match diameter between the OMT and the > antenna waveguide. Pretty hard to screw up. > > We have a pair of Dragonwave antenna’s in the shop that we can mount all of > this to and try here - and we can’t get a decent signal even 20’ apart. I’m > at a loss at this point. The only part that doesn’t appear to work is the > adapter plate - and there is nothing interesting about it. > > How the heck can this not work: > > <image001.jpg> > > <image002.jpg> > > I can’t buy that the alignment of the antenna would need to be adjusted. > That makes no sense in my head. Am I wrong in that assumption? > > Mark > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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