Category: Communications & Receivers

Sometimes it is ideal for your radio transmissions to be overheard by outside parties but sometimes it is highly undesirable. Radio by its very nature is an open medium. Interception equipment such as radio scanners are commonly available and easy to use. With such a device an unwanted listener could easily intercept your communications. How do we guard against such security vulnerabilities? Digitally encrypted public safety grade radio equipment is certainly an option albeit a very expensive one. Fortunately consumer grade equipment is commonly available that is capable of providing a high degree of privacy against unwanted interception. It is …

The scope of this article: I was involved in a discussion in the SHTF411 chat-room regarding SHTF radio communications.  Being a licensed Amateur Radio (ham) operator, I jumped in and put my two cents into the mix.  In the course of that discussion, I was asked to write something up on the subject.   Now, I am no expert on the subject and to be sure.  I sometimes feel that I am the least qualified among my peers.  With that in mind, please understand that much of what I’ve written in this essay is only my opinion and there will …

The following is my contribution to SurvivalBlog about antennas for High Frequency (HF) Transceivers. One antenna that has served me well over the years and easy to build is the G5RV antenna. Louis Varney, a British ham, came up with idea for the G5RV which also his call sign. The G5RV is a dipole antenna with 51 foot legs and the center feed point being 28’6″ of 300 ohm twin lead transmission grade twin lead connected to RG58 coaxial cable (“coax”). There are other construction methods, but for simplicity, we use a 1″ outside diameter PVC Tee to create a …

Dear Jim,   I have some cell phone details to your readers. I used to work in the cell phone business as a repair tech. Phones made before 2003 are not legal for activation in the USA. Some people continue to use old legacy hardware on the network, grandfathered in, but once that phone dies, they have to upgrade, under law, to an Enhanced 911 compliant/compatible device. That’s straight from the FCC, no ifs, ands, ors or buts. That means the Bag Phone, and even the StarTac aren’t legal. This is not to say that you can’t work around this …

Mr. Rawles, M.E.R. makes good points for the practice of journaling. I, too, encourage the activity. I would add a related activity – logging. No, not cutting trees, but recording activities, events, and details. I do my journaling within my log. I am not big on “my feelings”. I am more about doing what is needed and savoring the feelings later. Better? No. Different perhaps. I have found logging to be extremely valuable. My log has been computerized for decades, but lends itself to the same manual media as presented by M.E.R. I have recorded diverse events for years. I …

James: What M.B. is describing in his letter “Post Disaster Wi-Fi Commo Networks” is ideally served by a mesh network. I’d suggest starting at the Open Mesh web site. Click the Support link for tutorials and frequently asked questions (FAQs). If you want to link up a neighborhood this can work fairly well. Mounting the radios outside helps considerably and will often be required as the 2.4 GHz signal doesn’t penetrate obstructions very well. Existing wireless routers, old 2.4 GHz cordless phones, etc may interfere. If radio links are more than a few hundred feet apart you’ll need to get …