Good idea, not in uls and unmarked cabinet, landlord won't fork over their contact info, i'll keep pushing!
On Fri, Aug 8, 2025 at 12:17 PM Ken Hohhof <[email protected]> wrote: > Any chance it’s a PIM issue? I think we all dismiss PIM as something > vendors talk about and other people (not us) have to worry about, but I > guess it’s a possibility? > > > > Could be from your own equipment, or others on the same tower, like the > FBI you mention. If you can get contact information for them, maybe they > could shut their transmitters off for an hour to see if your problem goes > away? If they’re not in ULS, is there a phone number on their cabinet or > shelter at the site? We tend to be intimidated by the three letter agency > guys, but the few times I’ve had business related interactions with the > FBI, they’ve been fine to deal with, even if they do dress exactly like > you’d expect from TV. > > > > At least if you know it’s a PIM problem, that might give you some ideas > how to fix it. > > > > Maybe the 7 GHz with something sub GHz is creating intermod products in > lower 6 GHz? If not on your exact frequency, maybe close enough to > overload your receiver. > > > > *From:* AF <[email protected]> *On Behalf Of *TJ Trout > *Sent:* Friday, August 8, 2025 1:46 PM > *To:* AnimalFarm Microwave Users Group <[email protected]> > *Subject:* Re: [AFMUG] 6ghz (lower) interference > > > > Thanks Tim! > > > > I hadn't considered that low level interferer to be a concern, I went > ahead and temporarily reduced my channel size to move out of that space but > haven't seen any improvement. > > > > Pretty convinced it's an external interferer but it's either not within > the radios diplexers or it's some type of carrier scheme that the radio > cannot detect (Tarana?) > > > > Anything with AFC shouldn't be an issue but who knows, I think the only > solution is migration to a new band... > > > > On Mon, Jul 28, 2025, 1:32 PM Tim Hardy <[email protected]> wrote: > > 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]> > wrote: > > Did you do a spectrum scan? > > > > On Wed, Jul 23, 2025 at 3:55 PM TJ Trout <[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]> 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]> 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]> *On Behalf Of *Eric Nielsen > *Sent:* Tuesday, June 17, 2025 7:33 AM > *To:* AnimalFarm Microwave Users Group <[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 > > > > On Mon, Jun 16, 2025 at 4:53 PM TJ Trout <[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] > 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 > > -- > AF mailing list > [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 > > -- > AF mailing list > [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 > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Thank you, TJ Trout Volt Broadband 209.480.3122 Cell
-- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
