FEMA Opposes Broadband Over Powerlines

Curmudgeon Rick writes "According to eHam.net, the Federal Emergency Management Agency has put a submission to the FCC strongly opposing the use of powerlines for broadband distribution. The report can be found here [PDF link]. IMO, vendors should let powerline broadband die. They keep defibrillating it only because of the dollars they poured in; but it is and always was a dead duck." The submission concludes: "FEMA has concluded that introduction of unwanted interference from the implementation of BPL technology into the high frequency radio spectrum will result in significant detriment to the operation of FEMA [emergency] radio systems such as FNARS."

Comments

of course

[Anonymous Coward]

Why use powerlines when you can use pigeons?

Re:Emergency = Power outage?

[LastAndroid]

Thats a good point.

However if you can only use your ham radio when the power is out, then why own one?
People won't want to own them if they can't use them. Then when the power goes out almost no one will have them.

Depends...

[Svartalf]

Transmission conditions would be fine- but then you're talking about a transmitter with a lot of power compared to the BPL system. The transmitter might even jam the BPL system if it were working.

What they're worried about is reception. Over long distances, while the signals are detectable, they're really pretty weak comparatively speaking. The stuff that the BPL systems are generating are in the ballpark of the signal levels that might be detectable, so the signals from the BPL will be most likely the ones you detect.

So, you might be in a FEMA office, say like in Denton, Texas, where the power is on- but the emergency is in Corpus Christi or Brownsville. Power's out THERE because of a disaster- but the locally running BPL system's causing merry hob with your reception of the signal from that location.

Lets hope someone takes a wise decision

[borjam]

HF radio is *the* communication medium for many life-critical situations. It is the only affordable communication line for many NGOs operating in third world countries, and HF equipment is much easier to setup and more rubust than satellite equipment.

Until now, the HF spectrum has been carefully regulated to avoid harmful interference. It is just not acceptable to sacrifice it simply to get a cheaper Internet access. There are a good set of broadband technologies available which almost do not interfere with HF users.

Let's hope politicians wait to notice it until a true emergency happens...

Re:Emergency = Power outage?

[frovingslosh]

When a disaster hits and power and communication are out, hams are not just trying to talk to other hams in the local area (which they generally do on higher VHF and UHF bands anyway), they are trying to reach points that still have power. So if their signal is is jammed by crap radiating from the power lines, then vital communication can be lost.

Besides, how arogant can you be to think that hams should have their equipment sitting around useless because of lots of broadband over powerlines spectrum polution, not even be able to pratice using it or train new hams, and then expect that there will be no problem when there is a power and communication emergency just because the local broadband interference is now temporarly eliminated?

Re:This doesn't make sense

[W2IRT]

Ok, let's rephrase that then: wouldn't it make more sense to simply require broadband over powerline to not emit any significant energy in the HF spectrum?

And while we're at it, let's require that the laws of physics be re-written by Congress! You just don't understand what we're talking about. Power lines are great for low-frequency AC (60 Hz power), but inefficient for higher-frequency signals.

The proposed Broadband over Power Lines service would be a shared user of frequencies between 2 MHz and 80 MHz. Again, these frequencies wouldn't propagate as well over power lines, so they would be sent at high power levels. Much of their energy would be lost in the transmission from the upstream connector to your home -- i.e. radiated out the miles-long antenna formed by the power line! Simply put, you CANNOT have non-interfering BPL if it uses the 2-80 MHz spectrum. Period.

FEMA and other governmental users' radios are scattered between typically 2 and 50 MHz in different sub-bands that are used depending on the time of day, how active the ionosphere is and the overall path of intended communications. Ditto for fixed services, land-mobile, aeronautical and marine services, beacons, short wave broadcasters and amateurs.

The problem is two fold:
1) anybody trying to receive a signal between about 2 and 80 MHz would be unable to do so.
2) Legally-licensed transmitters in that range would cause untold interferance to these "Part 15" devices. Part 15 means they can't legally cause interferance and must live with any interferance they get. Aunt Millie's not going to be happy when her cordless phone is rendered useless by broadband and Uncle Phil will be pissed when he can't surf porn because the clean and licensed 1000 Watt transmitter up the block is on the air.

This has to be killed and killed NOW.