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Emergency Communications

In this modern day and age, we take electronic communication for granted. Imagine being plunged into a world were there are no phones, cellphones, internet, email, television or even radio. Back in the day when I served aboard ships, we called that being underway.

Way, way back in the late 1980’s and early 1990’s, those that served at sea were at the mercy of the Fleet Post Office.  I will say, the FPO did a very good job routing the mail to the appropriate place, however, sometimes weeks or even a month would go by without mail.  When the mail finally did arrive, it all smelled the same.  Everyone’s wife or girl friend put some sort of scent on the outgoing, but since those letters mingled tightly packed in the same bag for weeks, often in hot humid tropical Pacific air, those scents blended together and became the Westpac Mail Smell, which permeated everything, even the letters from my father.

What will happen if people can’t sign on Facebook?

Fortune favors the prepared.

Communications loss in ordinary circumstances

Loss of utility company power, phone service and internet service can happen at any time for a variety of reasons.  The worst case scenario will occur when such loss is coupled with a natural disaster, which are often a major disruption of normal life.  Loss of information, especially at critical moments, can make a bad situation much worse.  In a situation where all normal means of communication are not functioning, something will fill that void, most likely the rumor mill.  That could be bad.

For information gathering, there are many options.  A good AM/FM shortwave radio is a decent start.  I would recommend a quality shortwave radio that has AM/USB/LSB options.  During run of the mill storms and power outages, many radio stations will remain on the air with emergency generators.  The key is to figure out which stations are staffed and offer good timely information.  NOAA all hazards radio can be good source of weather information, however, their transmitters can remain off the air for weeks or months at times.

One might ask “Isn’t this overkill or alarmist?”  I suppose that depends.  In the December 2007 ice storm, we had no power for seven days. In the aftermath of several major Northeast hurricanes and winter storms, some people had no power for more than two weeks.  Not only no power, but no cable, phone or internet either.  In situations like that, having some form of connection to the outside world can make a big difference.

Communications loss in less than ordinary situations

Other situations and scenarios may require more effort.  Prolonged information shortages could be triggered any number of national or global situations.  Shortwave receivers are not only for listening to international broadcast stations but also for tuning into the amateur radio (AKA “Ham”) frequencies as well.  Amateur radio is often used for emergency communications on a local and national and international level by governments and the Red Cross when other systems are out.  National and international communications are often heard on the HF band; 3-30 MHz.  The Amateur radio primary emergency voice nets are:

  • 3791.0 USB VOICE PRIMARY International, DX, and Emergency/Disaster Relief
  • 5371.5 USB EMERGENCY Emergency/Disaster Relief
  • 5403.5 USB EMERGENCY Emergency/Disaster Relief
  • 7185.5 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief
  • 14346.0 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief
  • 18117.5 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief
  • 21432.5 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief
  • 24932.0 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief
  • 28312.5 USB VOICE PRIMARY International/Regional and Emergency/Disaster Relief

These are voice channels from the ALE website. If there is not traffic on these frequencies, tune around a little bit.  In addition to voice nets, the amateurs also use something called ALE, which stands for automatic link establishment.  This is a data system that can be decoded on a listen only basis with a computer and some free software, for those so inclined.

For local amateur communications, 2 meter and 70 cm repeaters are often pressed into service.  For those, a VHF/UHF scanner is required.  Get a trunking scanner for 800 MHz police/fire dispatch as well.  Make sure that all radios can operate on 12 volts DC.  For this application, the size of the solar panel and battery is moderate, as receivers do not use much current.

Another option is a wide band USB radio for a lap top computer like a WinRadio WR-G315e.  These devices can be power by the USB outlet on the computer while the computer itself is charged with a solar panel.  For this route, some research on lap top solar chargers is needed.  The DC power requirements vary from lap top to lap top, so I can only offer general advice here.

With any receiver, a good antenna will greatly improve performance.  If there is room for an outdoor antenna, any length of wire strung up in a tree, away from power lines will work well.  For indoor setups, some type of receiving loop will work best.

Prolonged loss of communications in extraordinary circumstances

For longer term situations, gaining access to vital information and communications may become more problematic.  First of all, electronic communications require electricity.  Long term disruptions to the electrical distribution system could occur by either natural or man made events.  When those events happen, those that are prepared will be in a better position to survive if not thrive.  Things like ad hoc computer networks and amateur radio can facilitate two way communications.  In order to use amateur radio, one needs to get a license first.  This is a pretty easy thing to do and most other amateur radio operators won’t talk to you without a valid call sign.  Not only will they not talk to you, they will likely track you down and report you to the FCC.  That is the nature of the hobby, like it or don’t.

Amateur radio set ups can be very simple and not terribly expensive.  An used HF radio can be purchased on eBay for a moderate sum.  A simple multiband vertical antenna will serve general purposes.  For those that are interested in HF Link, a newer radio will work better.

Wireless ad hoc computer networks can be set up to establish a quasi internet over a moderate sized area.  WiFi WAN networks can be locally established using 900 MHz, 2.4 GHz, 5.8 GHz and 24 GHz license free channels.  Depending on the frequency, those links can be used for point to point medium to long haul links, or to establish local links to laptops and wireless devices:

  • 900 MHz: lower speed data rates, long haul, good to moderate building and vegetation penetration
  • 2.4 GHz: Limited channel availability, high atmospheric absorption, moderate speeds, low vegetation and building penetration
  • 5.8 GHz: High number of channels available, potential interference issue with TDWR radar systems, moderate to high speeds, line of sight only
  • 24 GHz: Large bandwidth, high speed, point to point back haul, line of sight only

Once the information is obtained, distribution to the greater public becomes a problem.  A very simple webserver (Apache, Nginx) with a light weight, simple index page containing vital information, news, weather, etc can be set up on a laptop and all HTTP traffic directed to the default index page.  This type of set up could be run off of a battery charged by a solar panel.  The issue here would be obtaining the information to put on the web page.

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7 comments to Emergency Communications

  • Gary

    First, happy holidays to you and yours, Paul!

    Second, great review! I’m still amazed at the number of people who think that “We have internet. Why are those amateur radio operators clogging up the airwaves?” I saw some time back a reporter whine that “anyone with a computer” could reach around the world. So why do people invest in those HF radios? I should have sent in a response stating, “A few hundred dollars (at most!) of radios and wire for antennae, and you can reach all over the world. Keep your computer, but what happens if you lose your beloved Internet? Now what?” I doubt he would have gotten the point, or he probably would have suggested, “That’s why we have FEMA.”

  • Another good tool to have is a police scanner. Often times, you can hear more about what is happening in your neighborhood using a scanner than you can with a radio. Often quicker.

  • Robert - DL3RR

    I had a discussion with a colleague recently about emergency communications. His attitude was that amateur radio had no place in modern disaster management and that amateur operators would only “get in the way”.

    I pointed out the role of amateur operators on 9/11 when all the relays went down – but apparently (so he said) that was years ago and could never happen here (in Europe)!

    Simplicity is the key which is all too often forgotten – with a homebrew rig, a battery and a length of wire, you can more or less always contact somebody. Try that with the Internet when the plug has been pulled.

  • Bob Doolittle

    It’s not just the radios in an emergency. Handing out 15 or 20 mobile or hand held radios to people with no net discipline would result in a mess. Most amateur radio operators know how to set up and handle net operation.

  • Erik Bagby

    The biggest threat are the telecom cartels’ endless thirst for every MHz of usable radio spectrum to be in their control. The real concern we should have is with corporate telecom owning all networks, what do we have left when their networks crash? Ask any Verizon customer on Fire Island what a great job they are doing years after the storm? Don’t fail to notice how things have changed. The Wireless cartels are all about profit, not public service or safety. It is one reason I will be the last man standing keeping our land mobile radio system online when they come for our 800MHz licenses.

    We need RF spectrum for INDEPENDENT and INDIVIDUAL use. There are forces at work to make sure that won’t happen. The current FCC is a table full of shills for the very industry they are supposed to regulate. Ham radio is not the only spectrum user at stake of losing, put public safety/part 90 and broadcast FM/TV (AM is of no interest to the cartels, but is already becoming useless thanks to noise emitting part 15 devices ranging from battery chargers to LED lights) and even GMRS.

    The next time the “big storm” looms, what is your local cartel doing to ensure your pipe won’t be broken? What recourse do we have as consumers when they fail to live up to their one-sided contracts? Answer: ask anyone on Fire Island how it’s working out for them, years after Sandy.

  • Chas

    Everything alright over in engineering radio land?

  • Chris R

    Its the dead of winter. He’s probably up to his armpits in calls. Nothing ever breaks in warm sunny weather. At least here in the east.

Axiom


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~Alan Weiner

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