Profile cover photo
Profile photo
Russell Dekema

Post has attachment
I clocked Verizon Wireless LTE on my Band 13-only device at 65 mbit down / 17 mbit up in the Lurie parking lot on north campus today. Top notch!

I wonder what things will look like next week when the students arrive en masse.

Post has attachment
I have a question about the outdoor DAS sites deployed on the athletic campus. Before the game, I took the following picture of one of the sites:

I see three main components to this site: The grey box on the left, the beige box on the right, and the two* antenna cylinders at the top of the pole.

Am I correct in thinking that the grey box on the left contains the optical-to-RF conversion equipment, and the beige box on the right contains the RF power amplifiers? If not, what is the purpose of those pieces of equipment?

Finally, why are there two antenna cylinders on the top of the pole? It is my understanding that this is a combined VZW/ATT site, and that each cylinder is an at-least-dual-band, three-sector antenna system. Are two cylinders needed in order to provide a separate antenna system for the ATT and VZW signals? Or are they there to form a combined six-sector antenna system? Or, finally, are the two antenna systems required in order to support the wide variety of frequency ranges used by the two networks (700[b12/17], 700[b13], 850, PCS, AWS)?

* It is difficult to see that there are two antenna cylinders atop the pole from this picture, but from other angles it was clear to see that there are.

Thanks in advance for the info,
Rusty D

Post has attachment
While enjoying the Real Madrid vs. Manchester United game today, I noticed some equipment which appeared to be radio-related, located close to my seat:

After the game, I took a closer look at the equipment and learned that they were microwave (~7 GHz) receivers/downconverters. A bit of Googling revealed that this equipment is used to receive transmissions from wireless video cameras in the stadium ("Fan-Cams" and the like) and relay those transmissions via coaxial cable (or maybe Ethernet, in the future) to the TV networks covering the game.

There is a lot of infrastructure behind these games, and I was excited to learn the purpose of one more element of it.

Post has attachment
When it is working correctly, how many sectors are provided by the in-building cellular coverage/capacity equipment in Michigan Stadium? What kind of antennas are used, and where are they located?

Also, are these antenna panels:

...part of the cellular system? I am not completely up to date with antenna panel technology, but I don't understand how those panels could provide enough sectors to serve the entire stadium. On the other hand, I know that there are many radio systems active in the stadium which are completely unrelated to cell phones, so perhaps those panels are serving some other purpose.

Thanks in advance,

Is there any news on the potential AT&T macrocell on the roof of the EECS building?

Which protocols and frequencies are being used on the VZW outdoor DAS cells currently installed on campus? The four band/protocol combinations currently used by VZW on their Michigan macrocells are:

700 MHz (Band 13) - LTE 10x10MHz FDD
850 MHz (Band 5) - CDMA2000 1x and/or EV-DO
1900 MHz (Band 2) - CDMA2000 1x and/or EV-DO
2100/1700 MHz (Band 4) - LTE, I believe 20x20 MHz FDD in the SE Mich market

Is VZW transmitting all four frequency bands from their outdoor DAS installations, or some subset thereof?

What exactly is going to be done to address the Duderstadt Center in-building Verizon Wireless service degradation that is currently posted on the ITS status site (ID 87258)?

Is the hope simply that the VZW outdoor DAS sites on north campus will improve in-building service? Or is the plan to connect the existing in-building DAS infrastructure to an on-campus BTS, as opposed to the donor antenna that is currently feeding it from a public macrocell?

Redhat, Debian, and Ubuntu are going to switch to something called 'systemd' for init. I heard a rumor that Jonathan Billings is a fan of systemd and knows some things about it, so I nominate him to tell us about it over lunch!

Post has attachment
Free Pizza Tonight via a2geeks list. But you have to put up with some Android chatter. It's just like those religious free-meal outfits, except the religion is mobile OSes :P


IF you are an Android fan;
AND/OR just want free pizza;
AND/OR want to check out Mobiata's digs;
AND are interested in Android widgets;
AND live within 180 miles to Ann Arbor (some people do come that far!);
THEN you should come out to the Google Developer Group Ann Arbor Android (GDG-A3) meeting tonight. 

I know thats a lot of conditionals, but if they apply...

I am going to be talking about Android Widget strategy, along with my colleague Melissa Benzie. We'll cover why to do them, why not to do them, the variety of ways to do them, all of the things that Google/Android recommends to do but that you actually want to avoid, and a whole lot more. Android Widgets are awesome for developers and users, come find out why!

Note that we are not at our regular spot, we are over at Mobiata's HQ in Nickels Arcade. Already 24 attending, but we have pizza for more! 

Keith Bourne
Arbormoon Software, Inc.
Mobile Strategist
Wait while more posts are being loaded