I should have caught it much sooner. Link coordination and equipment is one of those things I handed off to another person. The job has now been passed off to the 3rd (or 4th if you count me) person. Didn't think something that basic would slip through so many people. Apparently we need to look closer at our training procedures when handing tasks off.
Mark On Wed, 01 Apr 2020 09:59:56 -0400, dmmoffett wrote: Ive actually been bitten by the same problem. Should have thought of that. Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Mark Radabaugh Date: 4/1/20 8:50 AM (GMT-05:00) To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] PTP Microwave antenna question Old thread but finally found the answer to what was going on with this link - and it's stupid. The 820C has 3 part numbers to cover the 11Ghz band. Apparently the coordinated frequency was outside of the range of the radio part number we were using. Amateur mistake. A couple of contributing factors - but one of the bigger ones is that the 820C will happily accept a frequency assignment outside of the sub-band without complaint. The older 800's and other brands we have used puke if you try to do that. We have kept all of our links in one sub-band for sparing. I think there is a newer 820C high power that has external swappable duplexers that will simplify the sparing but stocking one pair of radios and just the duplexers. I need to have our NOC look into that since we now have a 'spares' problem. Mark On Mar 6, 2020, at 2:49 PM, Mark Radabaugh wrote: 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 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 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 ON BEHALF OF ch...@wbmfg.com [5] SENT: Friday, March 6, 2020 2:32 PM TO: AnimalFarm Microwave Users Group 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: Mark Radabaugh Amplex 22690 Pemberville Rd Luckey, OH 43443 419-261-5996 On Mar 6, 2020, at 1:56 PM, Steve Jones 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 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 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 On Behalf Of Caleb Knauer > Sent: Friday, March 6, 2020 11:40 AM > To: AnimalFarm Microwave Users Group > 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 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 On Behalf Of Mark Radabaugh > > Sent: Friday, March 6, 2020 11:00 AM > > To: AnimalFarm Microwave Users Group > > Subject: Re: [AFMUG] PTP Microwave antenna question > > > > > > > > It's currently 2 single pol Horizons on a Dragonwave OMT mount that combines the H"> -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com [14] ------------------------- -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com [15] ------------------------- -- AF mailing list AF@af.afmug.com [16] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [17] -- AF mailing list AF@af.afmug.com [18] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [19] -- AF mailing list AF@af.afmug.com [20] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [21] -- AF mailing list AF@af.afmug.com [22] http://af.afmug.com/mailman/listinfo/af_af.afmug.com Links: ------ [1] mailto:m...@amplex.net [2] mailto:cknauer.li...@gmail.com [3] mailto:ch...@wbmfg.com [4] mailto:af-boun...@af.afmug.com [5] mailto:ch...@wbmfg.com [6] mailto:af@af.afmug.com [7] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [8] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [9] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [10] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [11] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [12] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [13] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [14] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [15] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [16] mailto:AF@af.afmug.com [17] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [18] mailto:AF@af.afmug.com [19] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [20] mailto:AF@af.afmug.com [21] http://af.afmug.com/mailman/listinfo/af_af.afmug.com [22] mailto:AF@af.afmug.com
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