It will also change a bit depending on what channel width you're using... 10mhz will gain you a few db over 20mhz, etc.
I'll generally go to a larger antenna on anything over 5-6 miles these days... actually I won't use NanoBridges for PtP links at all anymore, but that's another story. On Thu, May 7, 2015 at 9:33 PM, Glen Waldrop <[email protected]> wrote: > I'm thinking they may do the same with the tx power as well. > > > > ----- Original Message ----- > *From:* [email protected] > *To:* [email protected] > *Sent:* Thursday, May 07, 2015 9:29 PM > *Subject:* Re: [AFMUG] Nanobridge M5 > > You did account for the fact that Ubnt antenna gain specs usually add an > extra 2-3db "in taxes" right?. > ------------------------------ > *From: *"Glen Waldrop" <[email protected]> > *Sender: *"Af" <[email protected]> > *Date: *Fri, 8 May 2015 01:59:02 +0000 > *To: *<[email protected]> > *ReplyTo: *[email protected] > *Subject: *Re: [AFMUG] Nanobridge M5 > > Thanks. > > Accounting for 3dB "gain" added for MIMO and 18dBm tx power at full > modulation makes the math work out for what I'm actually seeing. > > Problem is I'm still only at MCS 12, which should be 22dBm tx. > > I think they add 3dB to every number on their datasheets accounting for > MIMO, which doesn't work out quite as nicely when doing the math. > > > > ----- Original Message ----- > *From:* Mike Hammett <[email protected]> > *To:* [email protected] > *Sent:* Thursday, May 07, 2015 8:52 PM > *Subject:* Re: [AFMUG] Nanobridge M5 > > Make sure you account for Tx power at full modulation vs. lowest > modulation. Always calculate based on full modulation. > > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > <https://www.facebook.com/ICSIL> > <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> > <https://www.linkedin.com/company/intelligent-computing-solutions> > <https://twitter.com/ICSIL> > > Midwest Internet Exchange > http://www.midwest-ix.com > > <https://www.facebook.com/mdwestix> > <https://www.linkedin.com/company/midwest-internet-exchange> > <https://twitter.com/mdwestix> > ------------------------------ > *From: *"Glen Waldrop" <[email protected]> > *To: *[email protected] > *Sent: *Thursday, May 7, 2015 8:51:49 PM > *Subject: *Re: [AFMUG] Nanobridge M5 > > > I thought so as well. Could be he's talking about the gain being +3dB on > the data sheets assuming for the gain due to MIMO. > > At 12 miles I get a -71. The math shows -61. > > Most of my NBM5 links are similar. I get much better signal with my old > 802.11a + PacWireless grids, usually right on the math. > > > > ----- Original Message ----- > *From:* John Woodfield <[email protected]> > *To:* [email protected] > *Sent:* Thursday, May 07, 2015 8:39 PM > *Subject:* Re: [AFMUG] Nanobridge M5 > > I thought you gained 2db because of MIMO? > > > > > > > > John Woodfield, President > > Delmarva WiFi Inc. > > 410-870-WiFi > > > > -----Original Message----- > From: "Josh Luthman" <[email protected]> > Sent: Thursday, May 7, 2015 9:35pm > To: [email protected] > Subject: Re: [AFMUG] Nanobridge M5 > > Well you're losing 3db because of MIMO. At least 1db from what the > antennas say. What's the signal now? > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > On May 7, 2015 9:32 PM, "Glen Waldrop" <[email protected]> wrote: > >> I've got a few links out there with the NBM5, longest is around 12 >> miles. >> >> According to the math I should get a decent shot at 24 miles, but >> according to that same math the NBM5 should have higher signal in every >> single link I've done. >> >> My question here is what is the longest link you've done with the NBM5 25 >> and what is the actual gain on these units since they don't seem to >> actually gain 25 as they're suppose to. >> >> I'm not opposed to using a Rocket and larger dish, just trying to >> see what the actual limits to the device are and what the actual gain is >> for math. >> >> Currently I've got the 24 mile shot with a 29 and 26dBi grids, decent, >> but still using 2008 MT hardware. I need more speed for growth. >> > >
