I was speaking with a friend of mine recently about some interference issues he was having at an FM transmitter site. There were several cellular and PCS tenants at this site and something from the FM transmitter was interfering with the GPS receivers. This one very small glitch was causing multiple carriers to go off line, basically shutting down the entire wireless infrastructure at this particular site.
GPS signals are used for syncing carrier frequencies and modulation timing for CDMA and TDMA that all cellular, PSC and 3G, 4G (or whatever G) wireless systems use to seamlessly hand off users from one site to another. Without it, the entire system will shut down.
What would happen to communications in this country if all GPS were interrupted? When I was in the military, we spoke often about high altitude nuclear detonations and the possible effects it would have on our communications circuits. In fact, we drilled for such things. Often. What, if anything, are wireless carriers doing to keep their sites on line if, heaven forbid, somebody does something to disrupt GPS? If terrestrial radio and television broadcasting is going to be replaced by 3G and 4G wireless networks, how redundant are they? I know, for example, many cell sites do not have long term backup power. They have battery banks, which in a power outage, may last 6-10 hours, but after that, the site is down.
Further, how about vulnerabilities getting the data to and from these sites? Most cell sites rely on some type of TELCO circuit, usually a T-1 (DS-1) or multiple T-1’s to interface with the wired network. This includes voice, text and data services. If those circuits are down, then anything connected to them will be off line.
What about redundant transmitters, antennas, receivers, etc. How much of the current wireless infrastructure is backed up with spares? It causes me worry to think that someday traditional broadcasters will be going out of business due to poor financial planning, leaving us all to subscription based data services that may or may not be there in an emergency. At least with many radio and TV stations, there are generators, backup transmitters, microwave systems and so forth. Most good broadcasters have emergency plans for restoration of service during a disaster. EAS may not be the greatest thing ever, but right now, it is the only emergency communications plan we have. Radio is still the best and most robust way to communicate vital information during emergencies. Cell sites go off line along with whatever G wireless service, cable TV systems go off line due to power outages or damaged distribution networks, land line phones can be taken out due to power interruptions at the company office or damaged networks.
Why do I care? Why should you care? Because, as I have eluded in previous posts, with the demise of local newspapers, the demise of local radio, the erosion of local TV news coverage and the general trivialization of our political apparatus on the local and national level, we are loosing our voice. We will loose our democracy. Right now, the US is on the verge of becoming an oligarchy or a corporatocracy.
What road are we traveling down when unrestricted free access to information is gone? The internet is a great resource, but it is not free. What will happen to the price of internet access when competing information and entertainment technologies such as radio, TV, and newspapers disappear? Look to our transportation sector for an example. Gone are the vast majority of passenger rail roads that criss crossed the country for nearly 100 years. In many places, public transportation is laughable. How do you get to work? How do you get to the store? How much will $5.00 per gallon gas effect your life? More importantly, what can you do about it when the cost of fuel gets expensive? Nothing. Most people are stuck in there suburban homes with not even a convenience store within walking distance.
What will happen when terrestrial radio goes away? I shutter to think.