I think at this point we are just going to go back out and try it without the Dragonwave adapter by swapping the mounting plate on the back of the antennas to the Cambium plates. We have a set of mounting plates on hand.
Mark > On Mar 6, 2020, at 2:46 PM, Caleb Knauer <cknauer.li...@gmail.com> wrote: > > He swapped radio pairs with known good in the field and that wasn't it. And > you can't rotate ODU flanges on C, they're fixed and meant to go to some > mediation devices. You can on the single core S. > > On Fri, Mar 6, 2020 at 2:43 PM <ch...@wbmfg.com <mailto:ch...@wbmfg.com>> > wrote: > If somehow those rectangular sections are not aligned you could have that > problem. > I am leaning toward a bad radio. > You could put both radios on the bench. Divert one of the rectangular > waveguides on each end. > I would not block it but just put some kind of 45 degree reflector in front > of it to direct the signal somewhere else. > Or if you could find some absorbing foam to put in front of it. > > From: Roland Houin <> > Sent: Friday, March 6, 2020 12:35 PM > To: 'AnimalFarm Microwave Users Group' <> > Subject: Re: [AFMUG] PTP Microwave antenna question > > I believe that you can rotate the waveguides in the odu. > > That could result in an incorrect polarization.. > > I believe we have run into that in the past > > > > Roland > > > > From: AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com>> On Behalf > Of ch...@wbmfg.com <mailto:ch...@wbmfg.com> > Sent: Friday, March 6, 2020 2:32 PM > To: AnimalFarm Microwave Users Group <af@af.afmug.com > <mailto:af@af.afmug.com>> > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > Acorns in the radome. > > > > From: Mark Radabaugh > > Sent: Friday, March 6, 2020 12:18 PM > > To: AnimalFarm Microwave Users Group > > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > Not a lot of options to put these together wrong. Line up the hangers and > it’s good to go: > > > > <image001.jpg><image002.jpg> > > > > Mark Radabaugh > > Amplex > > 22690 Pemberville Rd > > Luckey, OH 43443 > > 419-261-5996 > > > > > On Mar 6, 2020, at 1:56 PM, Steve Jones <thatoneguyst...@gmail.com <>> wrote: > > > > whats the OMT look like? That V/H pin puts the plate at 45? > > > > On Fri, Mar 6, 2020 at 12:48 PM Caleb Knauer <cknauer.li...@gmail.com <>> > wrote: > > If that center part is press fit in slightly catawampus and not 100% > plumb then it could cause issues. Or the pipe isn't 100% either. But > kind of grasping at straws with that. > > On the C's I've bench tested with XPIC without antennas, it'll talk to > either one IIRC if you run 2/1 or 1/2 as I've played with it. It's > really not happy about it though. I'd have to confirm though, been a > bit. > > XPIC keys or settings wouldn't affect the raw RXL levels, it just > blows out your MSE if they're crossed. I've seen links where they > didn't turn on anything XPIC but set it up and it works, just kinda > janky. > > You could always mute one core on both sides and sanity check that way > too. If something is crossed, it'd show the right RXL one on core and > 30ish dBm down on the other core. > > On Fri, Mar 6, 2020 at 1:12 PM Ken Hohhof <af...@kwisp.com <>> wrote: > > > > You look at Mark's photo and think what could possibly be wrong, it's a > > round hole. How many ways are there to install a round hole, it's like the > > proverbial one car funeral procession. > > > > And I guess with an 820C + OMT, having H and V swapped shouldn't be > > possible, and even if they were, it would still work if you did the same > > thing at both ends. I wouldn't assume though that XPIC would straighten > > out an H/V swap, I don't think it's like MIMO on WiFi. XPIC assumes the > > antenna cross pol rejection does most of the work and it has to clean up > > what remains. > > > > I'm assuming you have the XPIC keys enabled, although that would probably > > create an alarm not the symptoms you are seeing. > > > > -----Original Message----- > > From: AF <af-boun...@af.afmug.com <>> On Behalf Of Caleb Knauer > > Sent: Friday, March 6, 2020 11:40 AM > > To: AnimalFarm Microwave Users Group <af@af.afmug.com <>> > > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > With XPIC it wouldn't matter that slot 1 was talking to slot 2 on the other > > side, it wouldn't know. At least I think anyways. Since it's just looking > > for RX on the frequency it's set, and it's on the same on both ends, and > > it'd still have XPD to separate the two. You could rotate one end 90 > > degrees to simulate on the office rig to test I suppose. Plus anyways if > > you can't get signal worth a flip on the office rig, even if it was a > > polarity thing, that short of a link should blast it through to something > > you'd see. > > > > Only thing I can think of is that something in that tube is not aligned, > > bad press fit or mill or something like that and the waves are getting > > blown out of phase or similar. There's not but one way to put it together, > > and 820c -> OMT takes it to circular and you have circular to dish. > > > > On Fri, Mar 6, 2020 at 12:30 PM Mark Radabaugh <m...@amplex.net <>> wrote: > > > > > > Odd thing is I don’t see any way to assemble this any way that would swap > > > polarity. Only way to screw it up would be internal to the OMT itself. > > > We are doing XPIC with this link which we have not done in a lot of other > > > places, so that is different. > > > > > > Mark > > > > > > On Mar 6, 2020, at 12:22 PM, ch...@wbmfg.com <> wrote: > > > > > > > > > V&H being swapped will always cost you at least 20 dB and if you have > > > them precisely aligned V&H I can see where 40 dB is reasonable. > > > > > > From: Ken Hohhof > > > Sent: Friday, March 6, 2020 10:18 AM > > > To: 'AnimalFarm Microwave Users Group' > > > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > > > > > > OK, that says the antenna should be dual pol capable. So … is a > > > puzzlement. You’d expect a problem would cost a few dB, not 40 dB. > > > Unless H & V were swapped. > > > > > > > > > > > > Sounds like Cambium is looking into it, maybe they come up with some > > > ideas. > > > > > > > > > > > > From: AF <af-boun...@af.afmug.com <>> On Behalf Of Mark Radabaugh > > > Sent: Friday, March 6, 2020 11:00 AM > > > To: AnimalFarm Microwave Users Group <af@af.afmug.com <>> > > > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > > > > > > > > > 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 > > > <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 > > > <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 > > > <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 > > > <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 > > <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 > > <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 > <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 > <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 > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > > -- > AF mailing list > AF@af.afmug.com <mailto:AF@af.afmug.com> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > > -- > AF mailing list > AF@af.afmug.com <mailto:AF@af.afmug.com> > http://af.afmug.com/mailman/listinfo/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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