Most its a hardware limitation because the lower cost chipset they use
will only support 56mhz channels. That was the ETSI standard that I
believe broadcom is the fixedchipset that these use vs the higher cost
Ceragon/Exalt/SIAE that have software programmable FPGA systems that
allow for not only larger channel sizes but let you program offset
channels as well.
On 2/26/2019 4:23 PM, Cassidy B. Larson wrote:
Hardware limitations? SAF Lumina only did 56MHz.
On Feb 26, 2019, at 3:18 PM, Mathew Howard <[email protected]
<mailto:[email protected]>> wrote:
Well, I'm just guessing, but what other reason would there be for
occupying 79mhz with a 56mhz radio?
On Tue, Feb 26, 2019 at 4:08 PM Tim Hardy <[email protected]
<mailto:[email protected]>> wrote:
If that’s the case, it must’ve been truly horrid at 56 MHz.
There are consequences in this wasting of spectrum - you’ll
notice that modulations less than 16 QAM are not currently
coordinated or licensed since they fail to meet the FCC’s minimum
of 1 bit/Hz. Any operation of the AF-11 at QPSK or 1/4 QPSK is
not actually legal..
Sent from my iPad
On Feb 26, 2019, at 4:34 PM, Mathew Howard <[email protected]
<mailto:[email protected]>> wrote:
Yeah, but my point is that they made a really noisy 56mhz radio
work by just occupying a full 80mhz channel... at least that's
the way I understand it. It seems like they're kind of doing the
same thing here.
On Tue, Feb 26, 2019 at 3:24 PM Tim Hardy <[email protected]
<mailto:[email protected]>> wrote:
While the AF-11 used a 56 MHz chipset, the radio occupies
79.6 MHz - unlike all other radios with these chips that
limit their bw to 56 MHz (this used to be the ETSI
maximum). The AF-11 system gain is horrible for 1024 QAM
when compared to other outdoor radios - either full 60 MHz
or full 80 MHz bw.
Sent from my iPad
On Feb 26, 2019, at 3:26 PM, Mathew Howard
<[email protected] <mailto:[email protected]>> wrote:
Interesting, so I'm guessing that they're able to reduce
the noise to an acceptable level at that high of power by
using a narrower channel... kind of like what Ubiquiti did
with the AirFiber 11.
On Tue, Feb 26, 2019 at 1:54 PM Tim Hardy
<[email protected] <mailto:[email protected]>> wrote:
Just an FYI..
According to this chart, the occupied bandwidth is only
64.5 MHz so you will be losing capacity vs radios that
occupy the full 80 MHz bandwidth. The DW radio will
have to be coordinated and licensed in one of the 80
MHz channel allocations as there are no FCC channel
plans between 51 MHz and 79 MHz. There are only
4-channel pairs available at 80 MHz and its difficult
to coordinate multiple pairs in many areas as a result.
Finally, while these power levels are impressive, they
don't tell the full story and you really need to
compare the system gain values at the desired
modulations. The DW 64.5 MHz radio’s system gain at
2048 QAM is 83 dB vs. the WTM 4100 80 MHz radio’s
system gain at 2048 QAM which will be 73.5 dB.
On Feb 26, 2019, at 12:19 PM, Peter Kranz
<[email protected] <mailto:[email protected]>>
wrote:
+31 is the advertised 2048QAM output on the HP
variant. Dragonwave contacted me offline and is
indicating a March availability. Here is the table of
power output levels for that radio. It should also
support 4096QAM, but I’m not sure if that’s available
in the software yet.
<image001.png>
*Peter Kranz
*www.UnwiredLtd.com <http://www.unwiredltd.com/>
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected] <mailto:[email protected]>
*From:*AF <[email protected]
<mailto:[email protected]>>*On Behalf Of*Ken Hohhof
*Sent:*Monday, February 25, 2019 8:27 PM
*To:*'AnimalFarm Microwave Users Group'
<[email protected] <mailto:[email protected]>>
*Subject:*Re: [AFMUG] Higher power 18Ghz radios..
Looks like PTP820c is only +16.
You’re talking about xmt power actually at 2048QAM
modulation, right? +31 is hard to believe.
I remember hearing that Broadcom was supposed to have
a chip with adaptive digital predistortion for high
xmt power also 4096QAM not sure if that became real.
*From:*AF <[email protected]
<mailto:[email protected]>>*On Behalf Of*Peter Kranz
*Sent:*Monday, February 25, 2019 6:51 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*[AFMUG] Higher power 18Ghz radios..
Dragonwave announced over a year ago the Harmony
Enhanced 18HP, with +31 TX power at 2048 QAM, but have
never made it to production as far as I know. From the
top of my head, here are some of the major radios TX
power in 18 Ghz band:
Dragonwave Harmony Enahcend HP – 31<Vaporware?>
Dragonwave Harmony Enhanced SP – 22
Bridgewave Navigator – 19
Aviat WTM 4200 – 17.5
SIAE AlfoPlus2 – 17
Curious if anyone is aware of an 18Ghz dual core radio
capable of higher TX power at 2048QAM? It’s quite
difficult to license 6Ghz or 11Ghz paths in my market.
*Peter Kranz
*www.UnwiredLtd.com <http://www.unwiredltd.com/>
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected] <mailto:[email protected]>
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