Today we’re going to talk about spectrum analyzer comparisons.
In today’s video, we’re talking about the comparisons between different spectrum analyzers, spectrum analyzers are a hardware tool that lets you visualize something you can’t see with your human eyes.
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Welcome.
My name is Keith Persons,
and today we’re going to talk about
spectrum analyzer comparisons.
In today’s video, we’re talking about the comparisons between
different spectrum analyzers,
spectrum analyzers are a hardware tool
that lets you visualize
something you can’t see with your human eyes
Radio waves, they’re going 2.4 or 5 billion times a second
And our human body has no sensors that can relate to that at all
So in order for us to experience what’s going on in the radio world
will either have to have a radio that will decode it
and turn it into audio sound
Or what we’re going to be doing with spectrum analyzers is taking
and collecting the RF data and then slicing it up
and using a bunch of math
to convert it into something that’s visual
Well, let’s get started
To compare spectrum analyzers,
we’re going to use these graphics
to help us understand how they work
Here’s just a little sample from another company,
spectrum analyzer
Probably it’s about a thirty five thousand dollar one,
we’re not going to be using those
we’re going to be comparing spectrum analyzers that work
in the Wi-Fi world,
perhaps 900, 4.9, 2.4 gig, 5 gig
And hopefully as 6 gigahertz comes along,
we’ll have spectrum analyzers that will also
help us in the 6 gigahertz range
Let’s compare so
We have Ekahau sidekick.
A Cognio, in cognio made a chipset called Sage,
and originally it was in a PCMCIA format
That was the form factor and a lot of us have used them for,
oh, over a decade ago
And today they’re embedded inside Cisco AP called Clean Air
Netscout or Net Ally or it started out originally as Air Magnet
had a spectrum XT, also a USB form factor
And we’ll talk about that one as well
Metageek makes a DBx
They used to make a 2.4 only,
but now they only do the 2.4 and 5 combined
But they do have a new Wi-Spy Air,
which works with handheld devices,
very small battery operated one
Oscium has a Wi-Pry
and as well we’re going to look a little bit at Nuts About Nets
has a handheld, it doesn’t use your computer has its own screen,
but if you wanted to, you can hook it up together
So those are the ones
we’re going to be doing a little bit of comparison on
Before we can talk about how to compare them, though,
we need to understand some terms
and how we’re going to compare these
Now, one of the terms we’re going to compare is price
We understand price
That’s a very easy way to do it
Another way we can compare is what’s their form factor or
what’s their connection to your computer?
USB, USBC, USB micro or mini
or how you’re going to get connected
But also, we need to talk about a couple of terms here,
first is frequency ranges
What ranges can it hear?
Now, again, these aren’t 20 or thousand dollar spectrum analyzers
that can hear in the in the jargon D.C. to daylight everything from,
you know, super, super slow waves
all the way up to light waves
We don’t have anything that’s even close to that
They come in either 2.4, 5 gigahertz and they’re slightly different
But since they’re selling into the Wi-Fi market,
they’re pretty close together on that one.
The next one’s called a resolution bandwidth
And we have a couple of graphics here
that also explain this a little better
Resolution bandwidth is how it’s going to chunk up the data
that it receives and it’s going to listen
in this big of an area
Now, even with really low resolution bandwidth,
like you can see the 100 kilohertz example on the left
It can see hump
And depending on what you’re looking for, that might be enough
that can tell you what you’re looking for
Especially for something like a microwave oven, pretty obvious
As we go to a hot ten kilohertz, that’s way, way less than a
hundred kilohertz, 10 times less
It now allows us to see some spikes that were kind of
hidden before they were in the big hump.
But now we can see the detail
as you get down from 10 kilohertz to 100 hertz,
we’re again, way less
But now we’re looking at a very small, very precise information
Now, depending on your need, you may or may not need to see
this level of resolution,
but it does allow you to see things differently
So resolution bandwidth gets there
The next one is Sweet Time
And that’s how long are we going to take to cross the entire
frequency range that we’re looking at
Could be from 2.4 all the way through 5 gig
Could be, we can focus them
I think most of these spectrum analyzers, you can focus
and make it use that same sweet time, but on a smaller chunk
And then the last one is Duty Cycle
Most vendors use a different form of calculation for duty cycle
If you don’t understand how it is,
we have some other training modules will get deep into
how that process is done in a variety of different ways
But the duty cycle calculation changes
Just for a short view of that
If you’re in Metageek, you set the time range that you want
the duty cycle to calculate on
So if I set a time range for ten minutes
and something is only on for one minute,
even if it was on 100 percent of the time,
it would show up only as 10 percent duty cycle
We control the time range
If you’re in control of the time range,
you have to also then be very cognizant of what that is
Some other Spokane’s do their duty cycle near instantaneous
On the last time they looked of the last time I looked,
what’s the percentage?
And so those are closer to instantaneous
and you would get different duty cycles depending
on which vendor’s product you’re using
So just be sure you know what those are
Let’s drill in and look at these
We have an Ekahau Sidekick, Cognio Clean Air,
NetAlly makes the Spectrum XT, Wi-Spy DBx, Wi-Spy Air,
a Wi-Pry and RF Explorer
You can, at your leisure
I’m not going to go through all the little details here,
but you can see they have different price points
By the way, the Cognio,
you can no longer purchase it in PCMCIA format
I know some people, I have a couple, I still hang around
In fact I have a couple of laptops
that whose only purpose is for me to be able to
put that Cognio Clean Air in there
So you can check this out
There’s a smaller resolution, meaning I’m looking at tighter,
more precision sweep time is how fast I’m going
Allow me to collect data, maybe moving very quickly
And if I have a slow sweep time,
I might miss those things that are going by
You also have to look at the connection type
What kind of computer are you going to be connecting to
and how would you like to do that?
Just about any of these can connect up to a dongle
If I’ve USBC, I put on USB dongle
and I can put either the micro or the minis in there
The nice thing about some also support lightning
And so if you want to do a handheld device,
you can also support lightning
Choose wisely
Make sure you are getting what you need
So look at the capabilities they have
Look at their price
Look at the form factor and connection
I like to look at the resolution and sweep time
because I like to see the little nitty gritty things is going by
In your own world, when, where and why will you be using
spectrum analysis and then use the answers for that
to help you choose which one you want
If you’d like to learn more
Not just about spectrum analyzers, about Wi-Fi in general,
about our community of Wireless LAN Professionals
Please come and join me at a Wireless LAN Professionals
or WLANPros.com
My name is Keith Parsons
Thanks for being part of the community
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