Well, the difference in free space loss at 20km vs 2 miles should be somewhere around 16db so going with that number (which is similar to our ~2 mile AF24 link) and adding in an extra 2db for the HD, that gets you about -73, so it should work... as long as the weather is clear and nobody sneezes.
On Mon, Sep 14, 2015 at 12:59 PM, Bill Prince <[email protected]> wrote: > That's just pure hocum. > > On the SF peninsula, our longest AF24 (not HD) link is ~~ 2.25 miles (3.6 > km). We get RSI of ~~ -59, and we do get full modulation of 64QAM at that > distance; so it gets the full ~~ 770 Mbps. However, it does fade in the > rains we get here, which is similar to what you might get just a couple > hundred miles from us. The worst fade we've seen on this link is down to > maybe 700 Mbps (that's over the air rate, full dux). > > That link "might" be tweaked up just a little bit, but not much. I can't > imagine that the HD would go all that much further unless you were > transmitting through a vacuum. > > bp > <part15sbs{at}gmail{dot}com> > > > On 9/14/2015 9:24 AM, SmarterBroadband wrote: > > I have not studied the spec sheets. But UBNT say AF24 = 13 km and AF24HD > = 20 km. So I assumed it had more EIRP and therefore some more range? > > > > Just wondered if it would be a 50% increase in distance in the real world. > > > > *From:* Af [mailto:[email protected] <[email protected]>] *On > Behalf Of *Josh Luthman > *Sent:* Monday, September 14, 2015 9:16 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] AF24HD > > > > It isn't going to get any more distance, I don't know why you think it > would? EIRP is EIRP. > > > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > > On Mon, Sep 14, 2015 at 12:15 PM, SmarterBroadband < > [email protected]> wrote: > > Northern California, Sierra foothills. > > AF24 works here well up to 3 miles. We have one at 4.3 miles, which to > date has worked well but as we have had no rain to speak of for years it’s > hard to know what it will do in the rain. > > Anyone a feel for the % better a 24HD is over 24? > > Adam > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Josh Luthman > *Sent:* Monday, September 14, 2015 9:11 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] AF24HD > > > > Where? > > > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > > On Mon, Sep 14, 2015 at 12:06 PM, SmarterBroadband < > [email protected]> wrote: > > What kind of real world distances are you seeing with AF24HD compared with > AF24? > > > > > > > > > > >
