Category: Communications & Receivers

Text Comms in a Post-Disaster World – Part 4, by J.M.

(Continued from Part 3.) Flashing I’ve covered a lot of details regarding how Meshtastic works, so let’s walk through an example of configuring an actual device to see how it all applies. Note that one of the results of Meshtastic currently being primarily a hobbyist activity is that there are multiple ways of doing things. For example, you can connect a Meshtastic device to a PC via serial (over USB) or Bluetooth, you can manage the device from a PC using an Internet-based web interface, a locally hosted web interface or a Command Line Interface (CLI), you can update the …


Text Comms in a Post-Disaster World – Part 3, by J.M.

(Continued from Part 2.) Charging In regards to charging, most Meshtastic devices have a built-in USB-C port for charging the internal battery (except for the T1000-E mentioned above). The USB-C port can also be used to connect to the device to a computer for upgrading the firmware or managing the device via a web browser. Compact Comms Above is a picture of several Meshtastic devices to give you an idea of their sizes:


Text Comms in a Post-Disaster World – Part 2, by J.M.

(Continued from Part 1.) Meshtastic provides native integration with GPS satellite data for location information. Many Meshtastic devices come with a hardware GPS receiver built in, and the Meshtastic app has the ability to share GPS data from a paired cell phone if it’s not built into the device. There is usually a shortcut in many Meshtastic devices for immediately sending your location information to other users in the event of an emergency. The Meshtastic phone app has the ability to download local copies of some maps so you can pinpoint other people’s locations. I realize that many people don’t …


Text Comms in a Post-Disaster World – Part 1, by J.M.

Unless you’re a completely isolated loner, communications are going to play a critical role in both short-term and long-term disaster scenarios. Being able to effectively exchange information with family, friends and community members in both short-term as well as long-term disaster scenarios can literally mean the difference between surviving or going the way of The Dodo. There have been dozens of articles on SurvivalBlog about the use of radios for voice communications, and having appropriate radios and communications plans should definitely be considered a critical part of any preparedness plan. However, there’s another form of communications that should be considered …


Secure Local Comms With POTS Equipment, by Tractorguy

Land-line analog telephone service was ubiquitous in most of the 20th Century. This hardware is now commonly Plain Old Telephone Service (POTS).  This was our primary means of communication. It was simple, robust, and reliable. A few users still have landline service, although most landline service has migrated to digital means over a public Internet connection, with a modem at the user’s residence converting the digital data back to analog and providing ringer voltage to operate the bell. A lot of these telephones and associated equipment still exist, and are sitting in basements and attics. They could be easily pressed …


The “Come as You Are” Collapse–Have the Right Tools and Skills

Introductory Note From JWR: This article is an update and small expansion to a succinct post that I made back in February, 2008. When the Second World War broke out in September, 1939, the United States had nearly two full years to ramp up military training and production before decisively confronting the Axis powers. In the mid-1970s, looking at the recent experience of the 1973 Arab-Israeli War, the Pentagon’s strategic planners came to the realization that the next major war that the US military would wage would not be like the Second World War. There would not be the luxury …


The Baofeng DM32-UV DMR Radio: A Review, by Mike in Alaska

This review is from my own personal experience with this radio. I bought and paid for this radio from a website that I subscribe to and in no way do I represent that individual(s) or the Baofeng company. Baofeng has been building and selling inexpensive radios for quite a while now. I have, in the past, bought at least 20+ of the Baofeng UV-5 radios and some of the variants of that basic radio. All of them have been proven to be reliable for their limited use. They were very inexpensive, and to some extent, they still are. For a …


Directional Antennas Improve COMSEC, by Tunnel Rabbit

Editor’s Introductory Note:   For those who are unfamiliar with the term “YagI”,  I’ll preface this article with a bit of history from the InfoGalactic wiki: “A Yagi–Uda antenna, or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array; these elements are most often metal rods (or discs) acting as half-wave dipoles. Yagi–Uda antennas consist of a single driven element connected to a radio transmitter or receiver (or both) through a transmission line, and additional passive radiators with no electrical connection, usually including one so-called reflector and any number of …


Using Military Principles to Improve Civilian Radio Comms – Part 3, by Tunnel Rabbit

(Continued from Part 2. This concludes the article.) Antennas As an example, factory broad band antennas can suffice, yet performance in terms of propagation and receive will be lacking, and the overall range shortened, and the transceiver’s life possibly shortened. And there are other issues to consider. The crude, yet effective Baofeng UV5R does not power back given an excessively high Voltage Standing Wave Ratio (VSWR) from an antenna, and this situation will shorten the life of the ‘finals’ of this transceiver. If the back side of a Baofeng UV5R becomes warm to the touch, stop transmitting, drop the power …


Using Military Principles to Improve Civilian Radio Comms – Part 2, by Tunnel Rabbit

(Continued from Part 1.) Emergency Communications The Emergency level (the “E” of the PACE acronym) methods of communications are used exclusively during recovery or for link up in the field where no electronic means are possible or desirable. The injured may need to use a whistle as their only means to call for help. Linking up in the field is a very dangerous situation that carries the threat of ambush with it, or even casualties from friendly fire. How the Emergency PACE level methods are used to signal using a code or a procedure only known to friendly participants must …


Using Military Principles to Improve Civilian Radio Comms – Part 1, by Tunnel Rabbit

Introduction In my recent SurvivalBlog multi-part article, Communications Options for the Common Man, I looked at how to use commonly available license-free radios in a way that provided a low level of communication security by following a few basic rules, by mostly untrained people. Included in that article was the use of field phones that are easy to use, and provide the highest level of communication security that could be available to both untrained and trained personnel. In this article, I will describe methods that could only be used by trained and disciplined personnel who can maintain higher standards, and …


TEOTWAWKI Signals Intelligence – Part 2, by Mike in Alaska

(Continued from Part 1. This concludes the article.) I will devote the rest of this article to a USB “dongle” type radio receiver that I have on hand, and the amazing things you can do with it. I also intend to make mention of a device called a “Tiny SA” a signal analyzer that was made more for spectrum analyzing signals on the test bench but can also be used for SIGINT as well. The USB dongle I am currently using is the RTL2832U. This is a low-price unit costing just $40. But I do advise you consider buying the …


Communications Options for the Common Man – Part 6, by Tunnel Rabbit

(Continued from Part 5. This concludes the article.) Field Phone Line Circuits: The Platoon Hot Loop This method can to be used if the layout of LP/OPs is favorable. This method of connecting phones is referred to as the Platoon Hot Loop, yet the connection can be made to string the phones together, not in a circle but all along a singe line be it straight or in a circular shape that resembles a perimeter. The ‘loop’ is actually the electrical path created the connections made in a series in the same way Christmas tree lights were once supplied with …


Communications Options for the Common Man – Part 5, by Tunnel Rabbit

(Continued from Part 4.) The Swedish M37 field telephone is an example of a good middle-of-the-road approach that is relatively lightweight, affordable, adequately durable, and mostly found to be in good operational condition.  These are not as sophisticated and suitable for silent operation as either the TA-312 or the TA-1, yet they can be fitted with a 12 VDC grain of wheat sized red LED that pulses when an incoming call is made to the phone or a peizo buzzer that softly chirps and closely duplicates the TA-312 reduced volume ‘ringer’ merely by connect either to the terminals.  Disconnect the …


Communications Options for the Common Man – Part 4, by Tunnel Rabbit

(Continued from Part 3.) Applying P.A.C.E. to a Commo Plan For every communication requirement, always have an alternative or substitute option to accomplish the same task. For example, hand and light signals and whistles are appropriate alternatives for a security operation. As a last resort, a signal fire, fog horn, or air raid siren could be for emergency communications.  However, I should let the user make the final decision.  Stay off the beaten path as much as possible and increasingly so as the threat conditions escalate.  As threats learn and evolve, so should we.  Continually improve your security operation and …