18-Apr-2022

Demo Of The Bvs Yellowfin Wimax Test Receiver

You welcome for a brief video demonstration of Berkeley, Barrett Ron ix systems, yellow fin mobile WIMAX. 802 dots, 16 ii test receivers start off with the WIMAX right now with programs for one carrier frequency here at twenty-four ninety megahertz, the instrument will display the signal strength of the preamble and preamble is covered are zero to one thirteen. This particular preamble here has the number of the preamble inside the rectangular box as well as the URS aside, a signal strength level, that's. Riding up on top of the box in order to drill down to other features, is simply a matter of tapping the bar at the top, which has the carrier frequency.

And then you are presented with the preamble ID, the cell ID of a segment, the sign R and the RSSI signal strength for the preamble. In this case here in the lab, we only have one preamble up at this time, it's, bramble 16. And the RSSI is writing about the high and negative 60s at the moment we have some drill down screens where we do some unique things. In the industry in order to get to those you simply tap the particularly amiable number that you're interested in up here in the list, this screen presents the signal strength over time there are high and low watermarks on it. And it does contain about twenty seconds worth of history on the signal strength of the preamble up at the top. We then also relist of the information for that particular preamble to get the other screens is simply a swipe of this one here.

And now what we're doing is we're. Looking at the frequency response of the preamble itself, in addition to that, we can also make measurements in the time domain. A Berkley's product has the capability to make RF multipath measurements of the preamp. This particular screen. The y-axis is percentage of correlation.

The x-axis is in time in microseconds or time in symbol. We can see here is that we have a very nice pronounced peak at the zero time interval. And there are no reflections out in time here in microseconds or fractions of a. Symbol time we have color coded this to represent different fractions of the civil time in time. And depending on what your guard interval is would indicate whether you can tolerate the multipath within the first increment out to the second third or fourth. And then again, what would be not tolerated by the system and cause problems? Another swipe of the screen would display a newly created screen where we show the preamble and the sign are over time, each of which have their high and little water.

Marks on there, and each of which have about twenty seconds worth of history, then I can do only this sign R over time. Less swipe will get you back to the preamble RSSI over time. These two boxes here would either return me to the particular carrier frequency that I was fixed on or to a scan list. The scan list is created by pulling down the menu and inputting the frequency using this keypad where it would get built up on the left-hand side of the screen, and we can have multiple frequencies set up. And this can also be saved and retrieved as a file I can set it as my current list.

I can edit it, etc. So now I set it as my current list. What we notice is I have three different frequencies up here. Now, the instrument is actually changing carrier frequency. Every time it hits a carrier frequency about once per second, it'll, demodulate, whatever preambles are there, and it will also color code based on the colors up here. So all the preambles on the carrier frequency, 2490 will be shaded blue all of.Then on 2500 would be shaded green if we had them all of them on 25 10 would be shaded in red.

In addition to that feature, we also have to select the bandwidth and FFT samples. There are five different selections for the signal here in the test lab, we've selected ten megahertz as the bandwidth and 1024 is the FFT. The instrument also has a very nice feature called signal search. If you should go out into the field, and you really don't know what the carrier frequency is, you can enter a start and stop.

Frequency here and a step increment, and the instrument would find the carrier frequency. So let's put that to the test, if I know that my frequency is somewhere between 24, 50 and 25, 50, and I'm using a 10 megahertz step. Then, if I hit the search button, I have 10 frequencies to scan. And as soon as it stops on the carrier frequency, it'll display it, you can see here we have 24 90.

So it actually found the signal that we put on the air I can highlight that pass it over. And now I can say set the selective. Frequencies as my current scan list, we can also do some signal preamble filter and averaging here in regard to the RSSI over time.

And the preamble sign are over time. The instrument is capable of D modulating, the WIMAX signal over a very wide frequency range, which gives our product another unique capability. Anywhere between two gigahertz and 5.9 gigahertz. If you have any mobile WIMAX, they go to about 16 activity. The instrument will be able to demodulate it and show you the measurements that me. Have gone through just prior.

Of course, this wouldn't be complete unless we are able to log the data. And in this case that simply Windows driven thing where you would open up the log feature, you would create a file name and a folder and save that. And then, of course, as soon as that started, we would be logging the file and the file will be geocoded with the 12 channel GPS receiver that would be locked to a GPS signal. For example, during a drive study there's a tool called screen capture at any time. If I wanted to take a JPEG file snapshot of what I'm seeing on the display screen of the tablet PC, the instrument also has a power status screen because our module, which is sitting behind this tablet, PC has a built-in lithium-ion rechargeable power source. And this status screen is basically telling me that it's fully charged, and it's accurately tracking its charging voltage. The other thing I'd like to call your attention to is I've mentioned briefly.

The GPS there is a toggle here for a screen. That will give you the current GPS status. Here we display the latitude, longitude date time.

Number of visible satellites, number of tracked satellites and the status, which is very important while you're doing your drive study that's necessary that you maintain a 3d lock in order to properly geocode. Your measurements. One of the final features of the fin is its ability to measure signals in a spectrum. And what you'll find here is a very sophisticated laboratory grade spectrum, analyzer feature. Here.

In the lower left-hand corner is an extremely significant feature called a trigger, which is what I'm using now in order to signal and synchronize, the trace with the AFDM signal that's on the air without the trigger mode on I would simply be in the asynchronous mode up in the upper right-hand corner. We have three different color traces for this display, I've elected to use a peak hold, which is the white trace color, followed by an average red, trace color, trace over trace. And then I've also set up two. Markers here a main marker, which is the diamonds and a delta marker, which is the inverted triangle. The values of those markers are shown below what we're showing here on the screen is a simple power profile of that 10 megahertz channel that we have on the air for the test signal, but out in the field.

What you want to do is you may want to do spot studies or drive studies for Clear Channel analysis to make sure that you don't have any other signals there that shouldn't be there that would compete.Whether they are WIMAX signals or some other sources that brings me to the conclusion of the demonstration here for the yellow fin for a mobile WIMAX, Co, 2.16. E, Berkley bear avionics also has a similar model for 802 dots, 16 D that has basically the same features. But it uses the 802 that 16 D fixed WIMAX standard in the demodulation of the information. Thank you.