Josh
Will you shall the radio info?
Mitch
On 9/21/2017 12:57 AM, Josh Reynolds wrote:
The frequency agility between the radios is 800 mhz. Vastly different
radio filters.
Both are capable of similar channel bandwidths.
This is all done at MCS0 / QPSK
I'm comparing, basically, their sensitivity and selectivity. The radio
that is frequency capable of 200mhz is also capable of hitting
4096QAM, while the radio capable of operating in a 1GHz range of
frequencies is 256QAM capable.
Basically, it's (the 256QAM radio) sensitivity at the same modulation
and the same power is wayyyyyy closer than I would expect it should
be - vastly different, and far cheaper components. TL;DR: I'm calling
BS on the data sheet :)
On Thu, Sep 21, 2017 at 12:23 AM, Forrest Christian (List Account)
<li...@packetflux.com <mailto:li...@packetflux.com>> wrote:
Can you give specific examples? Having a hard time understanding
for sure the exact specs you're comparing.
In relation to the thermal noise floor: just reducing from 1000mz
to 200mhz will gain you ~7db of noise floor. But usually that's
in a channel, not in the entire 'frequency agility' area. Maybe
they aren't all that selective within the 1Ghz bandwidth.
I've never been able to find a chart of theoretical required s/n
ratio for each of the QAM's so I can't comment on how much
difference there is supposed to be - after all, with everything
else being the same (channel, modulation, power, etc), 256QAM
should definitely require a lower signal strength than a 4096QAM
radio. They definitely shouldn't be the same with the same
channel width, unless one radio is noisier or more susceptible to
noise.
And sensitivity should just be about the receiver, not the
transmitter.
On Wed, Sep 20, 2017 at 9:20 PM, Josh Reynolds
<j...@kyneticwifi.com <mailto:j...@kyneticwifi.com>> wrote:
Can someone smarter than I fill me in on something? I'm
comparing some
radios here (no names...)
One radio is 256 QAM, with a 1000mhz operating range
Another one is 4096 QAM, with a 200mhz operating range
Can you explain to me how the sensitivity on the 256QAM radio,
at the
same modulation rate, same (scaled) power level, claims to be
with a
single dB or two as sensitive as the 4096QAM radio with an 800mhz
smaller operating range?
Anyone?
Thanks :)
---
Josh Reynolds
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