ePMP uses a WiFi chip, and the psd of an OFDM WiFi signal has been described as looking like “Bart’s head”. A whole bunch of narrow QAM signals next to each other. I don’t know if Cambium has additional filtering for out of band and adjacent channel protection, or if they rely entirely on the OFDM rolloff. If not, the signal will bleed a bit into the next channel, and 5 or 10 MHz of guard band will get farther down Bart’s head.
From: AF <[email protected]> On Behalf Of Steve Jones Sent: Monday, May 18, 2026 12:13 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] EPMP SM split between sectors has low throughput download the troubleshooting file from the SM and both APs, drop them into claude. tell them the password is cambium or it burns an insane amount of tokens cracking it. Youll be suprized what claude can do with those 3 files and some background intelligence On Mon, May 18, 2026 at 11:24 AM Nate Burke <[email protected] <mailto:[email protected]> > wrote: I think I've run into this before, but it's been 4 or 5 years, and I ended up just taking the SM to another tower. I have a tower with a west EPMP3000 sector, and a South EPMP2000 Sector, both on Cambium antennas, and both with the BSA. They are on Adjacent, but non-overlapping channels. I have an SM that is installed at 225 Degrees into the tower, so evenly split between the 2 sectors. It see both AP's at the same signal level of -64, but Throughput tests on the SM are yielding ~5mb/1mb no matter which AP it's connected to. Other SM's which can see one of the AP's much better than the other can get 100mbs+ on the RF. The Front/back settings are for 180 opposite AP's, are there special settings for adjacent AP's? Unfortunately the SM is installed at a new construction without full time power yet, so I can't run testing on it easily, so I thought I'd ask before trying to fly blind when the customer plugs the SM in and expects a connection. I think my options are add another EPMP3000 with the Horn antenna facing the customer, or change them out to a PTP F425. -- 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
