If that -85 dBm carrier is co-channel or within the occupied bandwidth, it could be problematic. Typical co-channel interfering level requirement is around -99 dBm. Anything higher than that could be causing some issues.
> On Jul 23, 2025, at 6:24 PM, TJ Trout <[email protected]> wrote: > > Yes it's clean, only a tiny -85 carrier (link is -38 RSL) but I am starting > to think that maybe the interfering carrier is not being detected by the > radios integrated spectrum analyzer... Might need to do a secondary scan with > an external device. > > around the time the radio started having issues the FBI installed some type > of equipment on the same site, not sure if it is related but it looks like > two sector antennas for land mobile radio? And also a 7ghz cambium link. I > haven't had any luck in locating these transmitters in FCC ULS. > > On Wed, Jul 23, 2025, 1:04 PM Josh Luthman <[email protected] > <mailto:[email protected]>> wrote: >> Did you do a spectrum scan? >> >> On Wed, Jul 23, 2025 at 3:55 PM TJ Trout <[email protected] >> <mailto:[email protected]>> wrote: >>> Also only one side receiver is showing errors but the modulation is >>> affected in both TX directions. SNR and RSL remain unchanged since install! >>> >>> On Wed, Jul 23, 2025, 12:53 PM TJ Trout <[email protected] >>> <mailto:[email protected]>> wrote: >>>> So this 6ghz link is still acting up, connects at 4096 qam and demodulates >>>> to each lower order modulation step by step about every 1 second, once it >>>> reaches the lowest modulation it drops connection and immediately repeats >>>> the same behavior again. I've replaced both radios and performed spectrum >>>> analysis and found no interference. One side we replaced the DC power >>>> supply and the other side has many links but this is the only link >>>> misbehaving. >>>> >>>> Working with the mfg (aviat) but even they seem baffled at this point. >>>> >>>> Link was installed 5 years ago and performed flawless with no >>>> configuration changes since installation. >>>> >>>> Maybe the borg can help? >>>> >>>> On Wed, Jun 18, 2025, 10:15 AM Ken Hohhof <[email protected] >>>> <mailto:[email protected]>> wrote: >>>>> Unlikely, but something that occurs to me is that if I remember >>>>> correctly, unlicensed 6 GHz CPE radios are allowed to transmit at +30dBm >>>>> EIRP while trying to contact the AFC, and then at +36dBm if given >>>>> permission by the AFC. So it’s not like they can’t transmit at all >>>>> without OK from AFC, or are limited to very low power like indoor CPE. >>>>> >>>>> >>>>> >>>>> I think they first need to see the AP, which needs AFC permission, so a >>>>> total screwup seems unlikely. >>>>> >>>>> >>>>> >>>>> From: AF <[email protected] <mailto:[email protected]>> On >>>>> Behalf Of Eric Nielsen >>>>> Sent: Tuesday, June 17, 2025 7:33 AM >>>>> To: AnimalFarm Microwave Users Group <[email protected] >>>>> <mailto:[email protected]>> >>>>> Subject: Re: [AFMUG] 6ghz (lower) interference >>>>> >>>>> >>>>> >>>>> Send me a PM with the coordinates and/or callsign of the receiver that's >>>>> getting the interference. I'll run the site and tell you if I see >>>>> anything in the general area that could be suspect. >>>>> >>>>> If the link continues to receive interference, like others said, you >>>>> should run a frequency scan to identify the interfering emission and its >>>>> bandwidth. If the bandwidth is 40, 80, or 160 MHz, that's probably >>>>> unlicensed. >>>>> >>>>> >>>>> >>>>> Lastly, if the problem persists, you should report it through the AFC >>>>> interference portal: www.afcoperators.org <http://www.afcoperators.org/> >>>>> >>>>> >>>>> On Mon, Jun 16, 2025 at 4:53 PM TJ Trout <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> One of our aviat lower 6ghz links started taking errors on one side, I >>>>> haven't looked yet but I suspect it's interference from unlicensed >>>>> ptp/ptmp gear, is this even worth chasing? It seems like I might be >>>>> better off moving channels or bands? >>>>> >>>>> >>>>> >>>>> -TJ >>>>> >>>>> -- >>>>> AF mailing list >>>>> [email protected] <mailto:[email protected]> >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>>> -- >>>>> AF mailing list >>>>> [email protected] <mailto:[email protected]> >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> -- >>> AF mailing list >>> [email protected] <mailto:[email protected]> >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> [email protected] <mailto:[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
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